module Unix: sig .. end
File descriptor.
module File_descr: sig .. end
File descriptor.
Error report
type Unix.error =
| |
E2BIG |
| |
EACCES |
| |
EAGAIN |
| |
EBADF |
| |
EBUSY |
| |
ECHILD |
| |
EDEADLK |
| |
EDOM |
| |
EEXIST |
| |
EFAULT |
| |
EFBIG |
| |
EINTR |
| |
EINVAL |
| |
EIO |
| |
EISDIR |
| |
EMFILE |
| |
EMLINK |
| |
ENAMETOOLONG |
| |
ENFILE |
| |
ENODEV |
| |
ENOENT |
| |
ENOEXEC |
| |
ENOLCK |
| |
ENOMEM |
| |
ENOSPC |
| |
ENOSYS |
| |
ENOTDIR |
| |
ENOTEMPTY |
| |
ENOTTY |
| |
ENXIO |
| |
EPERM |
| |
EPIPE |
| |
ERANGE |
| |
EROFS |
| |
ESPIPE |
| |
ESRCH |
| |
EXDEV |
| |
EWOULDBLOCK |
| |
EINPROGRESS |
| |
EALREADY |
| |
ENOTSOCK |
| |
EDESTADDRREQ |
| |
EMSGSIZE |
| |
EPROTOTYPE |
| |
ENOPROTOOPT |
| |
EPROTONOSUPPORT |
| |
ESOCKTNOSUPPORT |
| |
EOPNOTSUPP |
| |
EPFNOSUPPORT |
| |
EAFNOSUPPORT |
| |
EADDRINUSE |
| |
EADDRNOTAVAIL |
| |
ENETDOWN |
| |
ENETUNREACH |
| |
ENETRESET |
| |
ECONNABORTED |
| |
ECONNRESET |
| |
ENOBUFS |
| |
EISCONN |
| |
ENOTCONN |
| |
ESHUTDOWN |
| |
ETOOMANYREFS |
| |
ETIMEDOUT |
| |
ECONNREFUSED |
| |
EHOSTDOWN |
| |
EHOSTUNREACH |
| |
ELOOP |
| |
EOVERFLOW |
| |
EUNKNOWNERR of int |
The type of error codes.
Errors defined in the POSIX standard
and additional errors, mostly BSD.
All other errors are mapped to EUNKNOWNERR.
module Error: sig .. end
exception Unix_error of error * string * string
Raised by the system calls below when an error is encountered.
The first component is the error code; the second component
is the function name; the third component is the string parameter
to the function, if it has one, or the empty string otherwise.
val unix_error : int -> string -> string -> 'a
Raises Unix_error with a given errno, function name and argument
val error_message : error -> string
Return a string describing the given error code.
val handle_unix_error : (unit -> 'a) -> 'a
handle_unix_error f runs f () and returns the result. If the exception
Unix_error is raised, it prints a message describing the error and exits with code
2.
val retry_until_no_eintr : (unit -> 'a) -> 'a
retry_until_no_eintr f returns f () unless f () fails with EINTR; in which
case f () is run again until it raises a different error or returns a value.
Access to the process environment
If you're looking for getenv, that's in the Sys module.
val environment : unit -> string array
Return the process environment, as an array of strings
with the format ``variable=value''.
val putenv : key:string -> data:string -> unit
Unix.putenv ~key ~data sets the value associated to a
variable in the process environment.
key is the name of the environment variable,
and data its new associated value.
val unsetenv : string -> unit
unsetenv name deletes the variable
name from the environment.
EINVAL name contained an ’=’ or an '\000' character.
Process handling
module Exit: sig .. end
The termination status of a process.
module Exit_or_signal: sig .. end
module Exit_or_signal_or_stop: sig .. end
val exec : prog:string ->
args:string list ->
?use_path:bool -> ?env:string list -> unit -> Common.never_returns
exec ~prog ~args ?search_path ?env execs
prog with
args. If
use_path = true
(the default) and
prog doesn't contain a slash, then
exec searches the PATH
environment variable for
prog. If
env is supplied, it is used as the environment
when
prog is executed.
The first element in args should be the program itself; the correct way to call exec
is:
exec ~prog ~args: prog; arg1; arg2; ... ()
val fork_exec : prog:string ->
args:string list -> ?use_path:bool -> ?env:string list -> unit -> Pid.t
fork_exec ~prog ~args ?use_path ?env () forks and execs prog with args in the
child process, returning the child pid to the parent.
val fork : unit -> [ `In_the_child | `In_the_parent of Pid.t ]
fork () forks a new process. The return value indicates whether we are continuing
in the child or the parent, and if the parent, includes the child's process id.
wait{,_nohang,_untraced,_nohang_untraced} ?restart wait_on is a family of functions
that wait on a process to exit (normally or via a signal) or be stopped by a signal
(if untraced is used). The wait_on argument specifies which processes to wait on.
The nohang variants return None immediately if no such process exists. If
nohang is not used, waitpid will block until one of the desired processes exits.
The non-nohang variants have a restart flag with (default true) that causes the
system call to be retried upon EAGAIN|EINTR. The nohang variants do not have this
flag because they don't block.
type [ `Any | `Group of Pid.t | `My_group | `Pid of Pid.t ]
val wait : ?restart:bool -> wait_on -> Pid.t * Exit_or_signal.t
val wait_nohang : wait_on -> (Pid.t * Exit_or_signal.t) option
val wait_untraced : ?restart:bool ->
wait_on -> Pid.t * Exit_or_signal_or_stop.t
val wait_nohang_untraced : wait_on -> (Pid.t * Exit_or_signal_or_stop.t) option
val waitpid : Pid.t -> Exit_or_signal.t
waitpid pid waits for child process pid to terminate, and returns its exit status.
waitpid_exn is like waitpid, except it only returns if the child exits with status
zero, and raises if the child terminates in any other way.
val waitpid_exn : Pid.t -> unit
val system : string -> Exit_or_signal.t
Execute the given command, wait until it terminates, and return
its termination status. The string is interpreted by the shell
/bin/sh and therefore can contain redirections, quotes, variables,
etc. The result WEXITED 127 indicates that the shell couldn't
be executed.
val getpid : unit -> Pid.t
Return the pid of the process.
val getppid : unit -> Pid.t option
Return the pid of the parent process.
val getppid_exn : unit -> Pid.t
Return the pid of the parent process, if you're really sure
you're never going to be the init process.
val nice : int -> int
Change the process priority. The integer argument is added to the
``nice'' value. (Higher values of the ``nice'' value mean
lower priorities.) Return the new nice value.
The abstract type of file descriptors.
val stdin : File_descr.t
File descriptor for standard input.
val stdout : File_descr.t
File descriptor for standard output.
val stderr : File_descr.t
File descriptor for standard standard error.
The flags to UnixLabels.openfile.
type Unix.open_flag =
| |
O_RDONLY |
| |
O_WRONLY |
| |
O_RDWR |
| |
O_NONBLOCK |
| |
O_APPEND |
| |
O_CREAT |
| |
O_TRUNC |
| |
O_EXCL |
| |
O_NOCTTY |
| |
O_DSYNC |
| |
O_SYNC |
| |
O_RSYNC |
| |
O_SHARE_DELETE |
Open for reading
Open for writing
Open for reading and writing
Open in non-blocking mode
Open for append
Create if nonexistent
Truncate to 0 length if existing
Fail if existing
Don't make this dev a controlling tty
Writes complete as `Synchronised I/O data integrity completion'
Writes complete as `Synchronised I/O file integrity completion'
Reads complete as writes (depending on O_SYNC/O_DSYNC)
type int
The type of file access rights.
val openfile : ?perm:file_perm ->
mode:open_flag list -> string -> File_descr.t
Open the named file with the given flags. Third argument is the permissions to give to
the file if it is created. Return a file descriptor on the named file. Default
permissions 0o644.
val close : ?restart:bool -> File_descr.t -> unit
Close a file descriptor.
val with_file : ?perm:file_perm ->
string ->
mode:open_flag list -> f:(File_descr.t -> 'a) -> 'a
with_file file ~mode ~perm ~f opens file, and applies f to the resulting file
descriptor. When f finishes (or raises), with_file closes the descriptor and
returns the result of f (or raises).
val read : ?restart:bool ->
?pos:int -> ?len:int -> File_descr.t -> buf:string -> int
read fd buff ofs len reads len characters from descriptor
fd, storing them in string buff, starting at position ofs
in string buff. Return the number of characters actually read.
val write : ?pos:int -> ?len:int -> File_descr.t -> buf:string -> int
write fd buff ofs len writes
len characters to descriptor
fd, taking them from string
buff, starting at position
ofs
in string
buff. Return the number of characters actually
written.
When an error is reported some characters might have already been
written. Use single_write instead to ensure that this is not the
case.
WARNING: write is an interruptible call and has no way to handle
EINTR properly. You should most probably be using single write.
val single_write : ?restart:bool ->
?pos:int -> ?len:int -> File_descr.t -> buf:string -> int
Same as write but ensures that all errors are reported and
that no character has ever been written when an error is reported.
val in_channel_of_descr : File_descr.t -> In_channel.t
Create an input channel reading from the given descriptor.
The channel is initially in binary mode; use
set_binary_mode_in ic false if text mode is desired.
val out_channel_of_descr : File_descr.t -> Out_channel.t
Create an output channel writing on the given descriptor.
The channel is initially in binary mode; use
set_binary_mode_out oc false if text mode is desired.
val descr_of_in_channel : In_channel.t -> File_descr.t
Return the descriptor corresponding to an input channel.
val descr_of_out_channel : Out_channel.t -> File_descr.t
Return the descriptor corresponding to an output channel.
Seeking and truncating
type Unix.seek_command =
| |
SEEK_SET |
| |
SEEK_CUR |
| |
SEEK_END |
POSITIONING modes for UnixLabels.lseek.
val lseek : File_descr.t -> int64 -> mode:seek_command -> int64
val truncate : string -> len:int64 -> unit
Truncates the named file to the given size.
val ftruncate : File_descr.t -> len:int64 -> unit
Truncates the file corresponding to the given descriptor
to the given size.
File statistics
type Unix.file_kind =
| |
S_REG |
| |
S_DIR |
| |
S_CHR |
| |
S_BLK |
| |
S_LNK |
| |
S_FIFO |
| |
S_SOCK |
type Unix.LargeFile.stats = {
|
st_dev :int; |
|
st_ino :int; |
|
st_kind :file_kind; |
|
st_perm :file_perm; |
|
st_nlink :int; |
|
st_uid :int; |
|
st_gid :int; |
|
st_rdev :int; |
|
st_size :int64; |
|
st_atime :float; |
|
st_mtime :float; |
|
st_ctime :float; |
}
val stat : string -> stats
Return the information for the named file.
val lstat : string -> stats
Same as UnixLabels.stat, but in case the file is a symbolic link,
return the information for the link itself.
val fstat : File_descr.t -> stats
Return the information for the file associated with the given
descriptor.
module Native_file: sig .. end
Locking
type Unix.lock_command =
| |
F_ULOCK |
| |
F_LOCK |
| |
F_TLOCK |
| |
F_TEST |
| |
F_RLOCK |
| |
F_TRLOCK |
val lockf : File_descr.t ->
mode:lock_command -> len:Int64.t -> unit
module Flock_command: sig .. end
val flock : File_descr.t -> Flock_command.t -> bool
flock fd cmd places or releases a lock on the fd as per the flock C call of the same
name.
val isatty : File_descr.t -> bool
Return true if the given file descriptor refers to a terminal or
console window, false otherwise.
Operations on file names
val unlink : string -> unit
Removes the named file
val rename : src:string -> dst:string -> unit
rename old new changes the name of a file from old to new.
val link : ?force:bool -> target:string -> link_name:string -> unit -> unit
link ?force ~target ~link_name () creates a hard link named link_name
to the file named target. If force is true, an existing entry in
place of link_name will be unlinked. This unlinking may raise a Unix
error, e.g. if the entry is a directory.
File permissions and ownership
val chmod : string -> perm:file_perm -> unit
Change the permissions of the named file.
val fchmod : File_descr.t -> perm:file_perm -> unit
Change the permissions of an opened file.
val chown : string -> uid:int -> gid:int -> unit
Change the owner uid and owner gid of the named file.
val fchown : File_descr.t -> uid:int -> gid:int -> unit
Change the owner uid and owner gid of an opened file.
val umask : int -> int
Set the process creation mask, and return the previous mask.
val access : string -> [ `Exec | `Exists | `Read | `Write ] list -> (unit, exn) Result.t
Check that the process has the given permissions over the named file.
val access_exn : string -> [ `Exec | `Exists | `Read | `Write ] list -> unit
Operations on file descriptors
val dup : File_descr.t -> File_descr.t
Return a new file descriptor referencing the same file as
the given descriptor.
val dup2 : src:File_descr.t -> dst:File_descr.t -> unit
dup2 fd1 fd2 duplicates fd1 to fd2, closing fd2 if already
opened.
val set_nonblock : File_descr.t -> unit
Set the ``non-blocking'' flag on the given descriptor.
When the non-blocking flag is set, reading on a descriptor
on which there is temporarily no data available raises the
EAGAIN or EWOULDBLOCK error instead of blocking;
writing on a descriptor on which there is temporarily no room
for writing also raises EAGAIN or EWOULDBLOCK.
val clear_nonblock : File_descr.t -> unit
Clear the ``non-blocking'' flag on the given descriptor.
See UnixLabels.set_nonblock.
val set_close_on_exec : File_descr.t -> unit
Set the ``close-on-exec'' flag on the given descriptor.
A descriptor with the close-on-exec flag is automatically
closed when the current process starts another program with
one of the exec functions.
val clear_close_on_exec : File_descr.t -> unit
Clear the ``close-on-exec'' flag on the given descriptor.
See UnixLabels.set_close_on_exec.
Directories
val mkdir : ?perm:file_perm -> string -> unit
Create a directory. The permissions of the created directory are (perm & ~umask &
0777). The default perm is 0777.
val mkdir_p : ?perm:file_perm -> string -> unit
Create a directory recursively. The permissions of the created directory are
those granted by mkdir ~perm.
val rmdir : string -> unit
Remove an empty directory.
val chdir : string -> unit
Change the process working directory.
val getcwd : unit -> string
Return the name of the current working directory.
val chroot : string -> unit
Change the process root directory.
type Unix.dir_handle
The type of descriptors over opened directories.
val opendir : ?restart:bool -> string -> dir_handle
Open a descriptor on a directory
val readdir : dir_handle -> string
Return the next entry in a directory.
Raises End_of_file when the end of the directory has been reached.
val rewinddir : dir_handle -> unit
Reposition the descriptor to the beginning of the directory
val closedir : dir_handle -> unit
Close a directory descriptor.
Pipes and redirections
val pipe : unit -> File_descr.t * File_descr.t
Create a pipe. The first component of the result is opened
for reading, that's the exit to the pipe. The second component is
opened for writing, that's the entrance to the pipe.
val mkfifo : string -> perm:file_perm -> unit
Create a named pipe with the given permissions.
High-level process and redirection management
module Process_info: sig .. end
Low-level process
val create_process : prog:string -> args:string list -> Process_info.t
create_process ~prog ~args forks a new process that
executes the program prog with arguments args. The function
returns the pid of the process along with file descriptors attached to
stdin, stdout, and stderr of the new process. The executable file
prog is searched for in the path. The new process has the same
environment as the current process. Unlike in execve the program
name is automatically passed as the first argument.
type [ `Extend of (string * string) list | `Replace of (string * string) list ]
create_process_env ~prog ~args ~env as create process, but takes an additional
parameter that extends, or replaces the current environment. No effort is made to
ensure that the keys passed in as env are unique, so if an environment variable is set
twice the second version will override the first.
val create_process_env : ?working_dir:string ->
prog:string ->
args:string list -> env:env -> unit -> Process_info.t
val open_process_in : string -> Pervasives.in_channel
High-level pipe and process management. These functions
(with UnixLabels.open_process_out and UnixLabels.open_process)
run the given command in parallel with the program,
and return channels connected to the standard input and/or
the standard output of the command. The command is interpreted
by the shell /bin/sh (cf. system). Warning: writes on channels
are buffered, hence be careful to call Pervasives.flush at the right times
to ensure correct synchronization.
val open_process_out : string -> Pervasives.out_channel
See UnixLabels.open_process_in.
val open_process : string -> Pervasives.in_channel * Pervasives.out_channel
See UnixLabels.open_process_in.
module Process_channels: sig .. end
Similar to UnixLabels.open_process, but the second argument specifies
the environment passed to the command.
val open_process_full : string -> env:string array -> Process_channels.t
val close_process_in : Pervasives.in_channel -> Exit_or_signal.t
Close channels opened by UnixLabels.open_process_in,
wait for the associated command to terminate,
and return its termination status.
val close_process_out : Pervasives.out_channel -> Exit_or_signal.t
Close channels opened by UnixLabels.open_process_out,
wait for the associated command to terminate,
and return its termination status.
val close_process : Pervasives.in_channel * Pervasives.out_channel -> Exit_or_signal.t
Close channels opened by UnixLabels.open_process,
wait for the associated command to terminate,
and return its termination status.
val close_process_full : Process_channels.t -> Exit_or_signal.t
Close channels opened by UnixLabels.open_process_full,
wait for the associated command to terminate,
and return its termination status.
Symbolic links
val symlink : src:string -> dst:string -> unit
symlink source dest creates the file dest as a symbolic link
to the file source.
val readlink : string -> string
Read the contents of a link.
Polling
module Select_fds: sig .. end
Wait until some input/output operations become possible on
some channels.
type [ `After of float | `Immediately | `Never ]
val select : ?restart:bool ->
read:File_descr.t list ->
write:File_descr.t list ->
except:File_descr.t list ->
timeout:select_timeout -> unit -> Select_fds.t
Setting restart to true means that we want select to restart automatically
on EINTR (instead of propagating the exception)...
val pause : unit -> unit
Wait until a non-ignored, non-blocked signal is delivered.
Time functions
type Unix.process_times = {
|
tms_utime :float; |
|
tms_stime :float; |
|
tms_cutime :float; |
|
tms_cstime :float; |
}
The execution times (CPU times) of a process.
type Unix.tm = {
|
tm_sec :int; |
|
tm_min :int; |
|
tm_hour :int; |
|
tm_mday :int; |
|
tm_mon :int; |
|
tm_year :int; |
|
tm_wday :int; |
|
tm_yday :int; |
|
tm_isdst :bool; |
}
The type representing wallclock time and calendar date.
val time : unit -> float
Return the current time since 00:00:00 GMT, Jan. 1, 1970, in seconds.
val gettimeofday : unit -> float
Same as
Unix.time above, but with resolution better than 1 second.
val gmtime : float -> tm
Convert a time in seconds, as returned by UnixLabels.time, into a date and
a time. Assumes UTC.
val timegm : tm -> float
Convert a UTC time in a tm record to a time in seconds
val localtime : float -> tm
Convert a time in seconds, as returned by UnixLabels.time, into a date and
a time. Assumes the local time zone.
val mktime : tm -> float * tm
Convert a date and time, specified by the tm argument, into
a time in seconds, as returned by UnixLabels.time. Also return a normalized
copy of the given tm record, with the tm_wday, tm_yday,
and tm_isdst fields recomputed from the other fields.
The tm argument is interpreted in the local time zone.
val strftime : tm -> string -> string
Convert a date and time, specified by the tm argument, into a formatted string.
See 'man strftime' for format options.
val strptime : fmt:string -> string -> Unix.tm
Given a format string, convert a corresponding string to a date and time
See 'man strptime' for format options.
val alarm : int -> int
Schedule a SIGALRM signal after the given number of seconds.
val sleep : int -> unit
Stop execution for the given number of seconds.
val nanosleep : float -> float
nanosleep f delays execution of the program for at least f seconds. The function
can return earlier if a signal has been delivered, in which case the number of
seconds left is returned. Any other failure raises an exception.
val times : unit -> process_times
Return the execution times of the process.
val utimes : string -> access:float -> modif:float -> unit
Set the last access time (second arg) and last modification time
(third arg) for a file. Times are expressed in seconds from
00:00:00 GMT, Jan. 1, 1970.
type Unix.interval_timer =
| |
ITIMER_REAL |
| |
ITIMER_VIRTUAL |
| |
ITIMER_PROF |
The three kinds of interval timers.
type Unix.interval_timer_status = {
|
it_interval :float; |
|
it_value :float; |
}
val getitimer : interval_timer -> interval_timer_status
Return the current status of the given interval timer.
val setitimer : interval_timer ->
interval_timer_status -> interval_timer_status
setitimer t s sets the interval timer t and returns
its previous status. The s argument is interpreted as follows:
s.it_value, if nonzero, is the time to the next timer expiration;
s.it_interval, if nonzero, specifies a value to
be used in reloading it_value when the timer expires.
Setting s.it_value to zero disable the timer.
Setting s.it_interval to zero causes the timer to be disabled
after its next expiration.
User id, group id
It's highly recommended to read the straight unix docs on these functions for more
color. You can get that info from man pages or
http://www.opengroup.org/onlinepubs/000095399/functions/setuid.html
val getuid : unit -> int
Return the user id of the user executing the process.
val geteuid : unit -> int
Return the effective user id under which the process runs.
val setuid : int -> unit
Sets the real user id and effective user id for the process. Only use this when
superuser. To setuid as an ordinary user, see
Core_extended.Unix.seteuid.
val getgid : unit -> int
Return the group id of the user executing the process.
val getegid : unit -> int
Return the effective group id under which the process runs.
val setgid : int -> unit
Set the real group id and effective group id for the process.
module Passwd: sig .. end
Structure of entries in the passwd database
module Group: sig .. end
Structure of entries in the groups database.
val getlogin : unit -> string
Return the login name of the user executing the process.
module Protocol_family: sig .. end
Internet addresses
module Inet_addr: sig .. end
Sockets
type Unix.socket_domain =
| |
PF_UNIX |
| |
PF_INET |
| |
PF_INET6 |
The type of socket domains.
type Unix.socket_type =
| |
SOCK_STREAM |
| |
SOCK_DGRAM |
| |
SOCK_RAW |
| |
SOCK_SEQPACKET |
The type of socket kinds, specifying the semantics of
communications.
type Unix.sockaddr =
The type of socket addresses. ADDR_UNIX name is a socket
address in the Unix domain; name is a file name in the file
system. ADDR_INET(addr,port) is a socket address in the Internet
domain; addr is the Internet address of the machine, and
port is the port number.
val domain_of_sockaddr : sockaddr -> socket_domain
Return the socket domain adequate for the given socket address.
val socket : domain:socket_domain ->
kind:socket_type -> protocol:int -> File_descr.t
Create a new socket in the given domain, and with the
given kind. The third argument is the protocol type; 0 selects
the default protocol for that kind of sockets.
val socketpair : domain:socket_domain ->
kind:socket_type ->
protocol:int -> File_descr.t * File_descr.t
Create a pair of unnamed sockets, connected together.
val accept : File_descr.t -> File_descr.t * sockaddr
Accept connections on the given socket. The returned descriptor
is a socket connected to the client; the returned address is
the address of the connecting client.
val bind : File_descr.t -> addr:sockaddr -> unit
Bind a socket to an address.
val connect : File_descr.t -> addr:sockaddr -> unit
Connect a socket to an address.
val listen : File_descr.t -> max:int -> unit
Set up a socket for receiving connection requests. The integer
argument is the maximal number of pending requests.
type Unix.shutdown_command =
| |
SHUTDOWN_RECEIVE |
| |
SHUTDOWN_SEND |
| |
SHUTDOWN_ALL |
The type of commands for shutdown.
val shutdown : File_descr.t -> mode:shutdown_command -> unit
val getsockname : File_descr.t -> sockaddr
Return the address of the given socket.
val getpeername : File_descr.t -> sockaddr
Return the address of the host connected to the given socket.
type Unix.msg_flag =
| |
MSG_OOB |
| |
MSG_DONTROUTE |
| |
MSG_PEEK |
The flags for UnixLabels.recv, UnixLabels.recvfrom,
UnixLabels.send and UnixLabels.sendto.
val recv : File_descr.t ->
buf:string -> pos:int -> len:int -> mode:msg_flag list -> int
Receive data from an unconnected socket.
val recvfrom : File_descr.t ->
buf:string ->
pos:int ->
len:int -> mode:msg_flag list -> int * sockaddr
Receive data from an unconnected socket.
val send : File_descr.t ->
buf:string -> pos:int -> len:int -> mode:msg_flag list -> int
Send data over an unconnected socket.
val sendto : File_descr.t ->
buf:string ->
pos:int ->
len:int -> mode:msg_flag list -> addr:sockaddr -> int
Send data over an unconnected socket.
Socket options
type
| |
SO_DEBUG |
| |
SO_BROADCAST |
| |
SO_REUSEADDR |
| |
SO_KEEPALIVE |
| |
SO_DONTROUTE |
| |
SO_OOBINLINE |
| |
SO_ACCEPTCONN |
| |
TCP_NODELAY |
| |
IPV6_ONLY |
The socket options that can be consulted with UnixLabels.getsockopt
and modified with UnixLabels.setsockopt. These options have a boolean
(true/false) value.
type
| |
SO_SNDBUF |
| |
SO_RCVBUF |
| |
SO_ERROR |
| |
SO_TYPE |
| |
SO_RCVLOWAT |
| |
SO_SNDLOWAT |
type
The socket options that can be consulted with UnixLabels.getsockopt_optint
and modified with UnixLabels.setsockopt_optint. These options have a
value of type int option, with None meaning ``disabled''.
type
| |
SO_RCVTIMEO |
| |
SO_SNDTIMEO |
The socket options that can be consulted with UnixLabels.getsockopt_float
and modified with UnixLabels.setsockopt_float. These options have a
floating-point value representing a time in seconds.
The value 0 means infinite timeout.
val getsockopt : File_descr.t -> socket_bool_option -> bool
val setsockopt : File_descr.t -> socket_bool_option -> bool -> unit
Set or clear a boolean-valued option in the given socket.
val getsockopt_int : File_descr.t -> socket_int_option -> int
Same as UnixLabels.getsockopt for an integer-valued socket option.
val setsockopt_int : File_descr.t -> socket_int_option -> int -> unit
Same as UnixLabels.setsockopt for an integer-valued socket option.
val getsockopt_optint : File_descr.t -> socket_optint_option -> int option
Same as UnixLabels.getsockopt for a socket option whose value is an int option.
val setsockopt_optint : File_descr.t ->
socket_optint_option -> int option -> unit
Same as UnixLabels.setsockopt for a socket option whose value is an int option.
val getsockopt_float : File_descr.t -> socket_float_option -> float
Same as UnixLabels.getsockopt for a socket option whose value is a floating-point
number.
val setsockopt_float : File_descr.t -> socket_float_option -> float -> unit
Same as UnixLabels.setsockopt for a socket option whose value is a floating-point
number.
High-level network connection functions
val open_connection : sockaddr -> Pervasives.in_channel * Pervasives.out_channel
Connect to a server at the given address.
Return a pair of buffered channels connected to the server.
Remember to call Pervasives.flush on the output channel at the right times
to ensure correct synchronization.
val shutdown_connection : Pervasives.in_channel -> unit
``Shut down'' a connection established with UnixLabels.open_connection;
that is, transmit an end-of-file condition to the server reading
on the other side of the connection.
val establish_server : (Pervasives.in_channel -> Pervasives.out_channel -> unit) ->
addr:sockaddr -> unit
Establish a server on the given address.
The function given as first argument is called for each connection
with two buffered channels connected to the client. A new process
is created for each connection. The function UnixLabels.establish_server
never returns normally.
Host and protocol databases
val gethostname : unit -> string
Return the name of the local host.
module Host: sig .. end
module Protocol: sig .. end
module Service: sig .. end
type
}
Address information returned by Unix.getaddrinfo.
type
| |
AI_FAMILY of socket_domain |
| |
AI_SOCKTYPE of socket_type |
| |
AI_PROTOCOL of int |
| |
AI_NUMERICHOST |
| |
AI_CANONNAME |
| |
AI_PASSIVE |
Options to Unix.getaddrinfo.
val getaddrinfo : string ->
string -> getaddrinfo_option list -> addr_info list
getaddrinfo host service opts returns a list of
Unix.addr_info
records describing socket parameters and addresses suitable for
communicating with the given host and service. The empty list is
returned if the host or service names are unknown, or the constraints
expressed in
opts cannot be satisfied.
host is either a host name or the string representation of an IP
address. host can be given as the empty string; in this case,
the ``any'' address or the ``loopback'' address are used,
depending whether opts contains AI_PASSIVE.
service is either a service name or the string representation of
a port number. service can be given as the empty string;
in this case, the port field of the returned addresses is set to 0.
opts is a possibly empty list of options that allows the caller
to force a particular socket domain (e.g. IPv6 only, or IPv4 only)
or a particular socket type (e.g. TCP only or UDP only).
type
|
ni_hostname :string; |
|
ni_service :string; |
}
Host and service information returned by
Unix.getnameinfo.
Name of service or port number
type
| |
NI_NOFQDN |
| |
NI_NUMERICHOST |
| |
NI_NAMEREQD |
| |
NI_NUMERICSERV |
| |
NI_DGRAM |
val getnameinfo : sockaddr ->
getnameinfo_option list -> name_info
getnameinfo addr opts returns the host name and service name
corresponding to the socket address addr. opts is a possibly
empty list of options that governs how these names are obtained.
Raise Not_found if an error occurs.
Getting terminal size
Terminal interface
The following functions implement the POSIX standard terminal
interface. They provide control over asynchronous communication ports
and pseudo-terminals. Refer to the termios man page for a complete
description.
module Terminal_io: sig .. end
val get_sockaddr : string -> int -> sockaddr
Get a sockaddr from a hostname or IP, and a port
val set_in_channel_timeout : Pervasives.in_channel -> float -> unit
Set a timeout for a socket associated with an in_channel
val set_out_channel_timeout : Pervasives.out_channel -> float -> unit
Set a timeout for a socket associated with an out_channel
val exit_immediately : int -> 'a
exit_immediately exit_code immediately calls the exit system call with the given
exit code without performing any other actions (unlike Pervasives.exit). Does not
return.
Filesystem functions
val mknod : ?file_kind:file_kind ->
?perm:int -> ?major:int -> ?minor:int -> string -> unit
mknod ?file_kind ?perm ?major ?minor path creates a filesystem
entry. Note that only FIFO-entries are guaranteed to be supported
across all platforms as required by the POSIX-standard. On Linux
directories and symbolic links cannot be created with this function.
Use
Unix.mkdir and
Unix.symlink instead there respectively.
RaisesInvalid_argument if an unsupported file kind is used.Unix_error if the system call fails.
file_kind : default = S_REG (= regular file)
perm : default = 0o600 (= read/write for user only)
major : default = 0
minor : default = 0
I/O vectors
module IOVec: sig .. end
I/O-vectors for scatter/gather-operations
I/O functions
val dirfd : dir_handle -> File_descr.t
Extract a file descriptor from a directory handle.
val sync : unit -> unit
Synchronize all filesystem buffers with disk.
val fsync : File_descr.t -> unit
val fdatasync : File_descr.t -> unit
Synchronize the kernel buffers of a given file descriptor with disk,
but do not necessarily write file attributes.
val readdir_ino : dir_handle -> string * nativeint
readdir_ino dh return the next entry in a directory (((filename,
inode)).
Raises End_of_file when the end of the directory has been
reached.
val read_assume_fd_is_nonblocking : File_descr.t -> ?pos:int -> ?len:int -> string -> int
read_assume_fd_is_nonblocking fd ?pos ?len buf calls the system call
read ASSUMING THAT IT IS NOT GOING TO BLOCK. Reads at most
len
bytes into buffer
buf starting at position
pos.
RaisesInvalid_argument if buffer range out of bounds.Unix_error on Unix-errors.
Returns the
number of bytes actually read.
pos : = 0
len : = String.length buf - pos
val write_assume_fd_is_nonblocking : File_descr.t -> ?pos:int -> ?len:int -> string -> int
write_assume_fd_is_nonblocking fd ?pos ?len buf calls the system call
write ASSUMING THAT IT IS NOT GOING TO BLOCK. Writes at most
len
bytes from buffer
buf starting at position
pos.
RaisesInvalid_argument if buffer range out of bounds.Unix_error on Unix-errors.
Returns the
number of bytes actually written.
pos : = 0
len : = String.length buf - pos
val writev_assume_fd_is_nonblocking : File_descr.t -> ?count:int -> string IOVec.t array -> int
writev_assume_fd_is_nonblocking fd ?count iovecs calls the system call
writev ASSUMING THAT IT IS NOT GOING TO BLOCK using
count
I/O-vectors
iovecs.
RaisesInvalid_argument if the designated ranges are invalid.Unix_error on Unix-errors.
Returns the number of bytes actually written.
val writev : File_descr.t -> ?count:int -> string IOVec.t array -> int
writev fd ?count iovecs like
Unix.writev_assume_fd_is_nonblocking, but does
not require the descriptor to not block. If you feel you have to
use this function, you should probably have chosen I/O-vectors that
build on bigstrings, because this function has to internally blit
the I/O-vectors (ordinary OCaml strings) to intermediate buffers on
the C-heap.
RaisesInvalid_argument if the designated ranges are invalid.Unix_error on Unix-errors.
Returns the number of bytes actually written.
val pselect : File_descr.t list ->
File_descr.t list ->
File_descr.t list ->
float ->
int list ->
File_descr.t list * File_descr.t list *
File_descr.t list
pselect rfds wfds efds timeout sigmask like
Unix.select but
also allows one to wait for the arrival of signals.
module RLimit: sig .. end
Resource limits
module Resource_usage: sig .. end
Resource usage -- For details, "man getrusage"
type
| |
ARG_MAX |
| |
CHILD_MAX |
| |
HOST_NAME_MAX |
| |
LOGIN_NAME_MAX |
| |
OPEN_MAX |
| |
PAGESIZE |
| |
RE_DUP_MAX |
| |
STREAM_MAX |
| |
SYMLOOP_MAX |
| |
TTY_NAME_MAX |
| |
TZNAME_MAX |
| |
POSIX_VERSION |
| |
PHYS_PAGES |
| |
AVPHYS_PAGES |
| |
IOV_MAX |
System configuration
val sysconf : sysconf -> int64
Temporary file and directory creation
val mkstemp : string -> string * File_descr.t
mkstemp prefix creates and opens a unique temporary file with
prefix, automatically appending a suffix of six random characters
to make the name unique.
Raises Unix_error on errors.
val mkdtemp : string -> string
mkdtemp prefix creates a temporary directory with prefix,
automatically appending a suffix of six random characters to make
the name unique.
Raises Unix_error on errors.
k
Signal handling
val abort : unit -> 'a
User id, group id
val initgroups : string -> int -> unit
val getgrouplist : string -> int -> int array
getgrouplist user group returns the list of groups to which user belongs.
See 'man getgrouplist'.
val getgroups : unit -> int array
Return the list of groups to which the user executing the process belongs.
Globbing and shell expansion
val fnmatch : ?flags:[ `Casefold
| `File_name
| `Leading_dir
| `No_escape
| `Pathname
| `Period ] list ->
pat:string -> string -> bool
val wordexp : ?flags:[ `No_cmd | `Show_err | `Undef ] list -> string -> string array
module Utsname: sig .. end
val uname : unit -> Utsname.t
Additional IP functionality
val if_indextoname : int -> string
val mcast_join : ?ifname:string -> File_descr.t -> sockaddr -> unit
mcast_join ?ifname sock addr join a multicast group at addr
with socket sock, optionally using network interface ifname.
ifname : default = any interface
val mcast_leave : ?ifname:string -> File_descr.t -> sockaddr -> unit
mcast_leave ?ifname sock addr leaves a multicast group at addr
with socket sock, optionally using network interface ifname.
ifname : default = any interface
module Scheduler: sig .. end
module Priority: sig .. end
module Mman: sig .. end
val error_of_sexp : Sexplib.Sexp.t -> error
val sexp_of_error : error -> Sexplib.Sexp.t
Unknown error
Raised by the system calls below when an error is encountered.
The first component is the error code; the second component
is the function name; the third component is the string parameter
to the function, if it has one, or the empty string otherwise.
Return a string describing the given error code.
handle_unix_error f runs f () and returns the result. If the exception
Unix_error is raised, it prints a message describing the error and exits with code
2.
retry_until_no_eintr f returns f () unless f () fails with EINTR; in which
case f () is run again until it raises a different error or returns a value.
Access to the process environment
If you're looking for getenv, that's in the Sys module.
Return the process environment, as an array of strings
with the format ``variable=value''.
Unix.putenv ~key ~data sets the value associated to a
variable in the process environment.
key is the name of the environment variable,
and data its new associated value.
unsetenv name deletes the variable name from the environment.
EINVAL name contained an ’=’ or an '\000' character.
Process handling
The termination status of a process.
of_unix assumes that any signal numbers in the incoming value are O'Caml internal
signal numbers.
of_unix assumes that any signal numbers in the incoming value are O'Caml internal
signal numbers.
exec ~prog ~args ?search_path ?env execs prog with args. If use_path = true
(the default) and prog doesn't contain a slash, then exec searches the PATH
environment variable for prog. If env is supplied, it is used as the environment
when prog is executed.
The first element in args should be the program itself; the correct way to call exec
is:
exec ~prog ~args: prog; arg1; arg2; ... ()
fork_exec ~prog ~args ?use_path ?env () forks and execs prog with args in the
child process, returning the child pid to the parent.
fork () forks a new process. The return value indicates whether we are continuing
in the child or the parent, and if the parent, includes the child's process id.
wait{,_nohang,_untraced,_nohang_untraced} ?restart wait_on is a family of functions
that wait on a process to exit (normally or via a signal) or be stopped by a signal
(if untraced is used). The wait_on argument specifies which processes to wait on.
The nohang variants return None immediately if no such process exists. If
nohang is not used, waitpid will block until one of the desired processes exits.
The non-nohang variants have a restart flag with (default true) that causes the
system call to be retried upon EAGAIN|EINTR. The nohang variants do not have this
flag because they don't block.
val wait_on_of_sexp : Sexplib.Sexp.t -> wait_on
val wait_on_of_sexp__ : Sexplib.Sexp.t -> wait_on
val sexp_of_wait_on : wait_on -> Sexplib.Sexp.t
waitpid pid waits for child process pid to terminate, and returns its exit status.
waitpid_exn is like waitpid, except it only returns if the child exits with status
zero, and raises if the child terminates in any other way.
Execute the given command, wait until it terminates, and return
its termination status. The string is interpreted by the shell
/bin/sh and therefore can contain redirections, quotes, variables,
etc. The result WEXITED 127 indicates that the shell couldn't
be executed.
Return the pid of the process.
Return the pid of the parent process.
Return the pid of the parent process, if you're really sure
you're never going to be the init process.
Change the process priority. The integer argument is added to the
``nice'' value. (Higher values of the ``nice'' value mean
lower priorities.) Return the new nice value.
The abstract type of file descriptors.
File descriptor for standard input.
File descriptor for standard output.
File descriptor for standard standard error.
The flags to UnixLabels.openfile.
val open_flag_of_sexp : Sexplib.Sexp.t -> open_flag
val sexp_of_open_flag : open_flag -> Sexplib.Sexp.t
Windows only: allow the file to be deleted while still open
val open_flag_of_sexp : Sexplib.Sexp.t -> open_flag
The flags to UnixLabels.openfile.
val sexp_of_open_flag : open_flag -> Sexplib.Sexp.t
Reads complete as writes (depending on O_SYNC/O_DSYNC)
val file_perm_of_sexp : Sexplib.Sexp.t -> file_perm
The type of file access rights.
val sexp_of_file_perm : file_perm -> Sexplib.Sexp.t
Open the named file with the given flags. Third argument is the permissions to give to
the file if it is created. Return a file descriptor on the named file. Default
permissions 0o644.
Close a file descriptor.
with_file file ~mode ~perm ~f opens file, and applies f to the resulting file
descriptor. When f finishes (or raises), with_file closes the descriptor and
returns the result of f (or raises).
read fd buff ofs len reads len characters from descriptor
fd, storing them in string buff, starting at position ofs
in string buff. Return the number of characters actually read.
write fd buff ofs len writes len characters to descriptor
fd, taking them from string buff, starting at position ofs
in string buff. Return the number of characters actually
written.
When an error is reported some characters might have already been
written. Use single_write instead to ensure that this is not the
case.
WARNING: write is an interruptible call and has no way to handle
EINTR properly. You should most probably be using single write.
Same as write but ensures that all errors are reported and
that no character has ever been written when an error is reported.
Create an input channel reading from the given descriptor.
The channel is initially in binary mode; use
set_binary_mode_in ic false if text mode is desired.
Create an output channel writing on the given descriptor.
The channel is initially in binary mode; use
set_binary_mode_out oc false if text mode is desired.
Return the descriptor corresponding to an input channel.
Return the descriptor corresponding to an output channel.
Seeking and truncating
val seek_command_of_sexp : Sexplib.Sexp.t -> seek_command
POSITIONING modes for UnixLabels.lseek.
val sexp_of_seek_command : seek_command -> Sexplib.Sexp.t
indicates positions relative to the end of the file
Set the current position for a file descriptor
Truncates the named file to the given size.
Truncates the file corresponding to the given descriptor
to the given size.
File statistics
val file_kind_of_sexp : Sexplib.Sexp.t -> file_kind
val sexp_of_file_kind : file_kind -> Sexplib.Sexp.t
Socket
val stats_of_sexp : Sexplib.Sexp.t -> stats
The informations returned by the UnixLabels.stat calls.
val sexp_of_stats : stats -> Sexplib.Sexp.t
Return the information for the named file.
Same as UnixLabels.stat, but in case the file is a symbolic link,
return the information for the link itself.
Return the information for the file associated with the given
descriptor.
The informations returned by the UnixLabels.stat calls.
Device number
Inode number
Kind of the file
Access rights
Number of links
User id of the owner
Group ID of the file's group
Device minor number
Size in bytes
Last access time
Last modification time
Last status change time
Return the information for the named file.
Same as UnixLabels.stat, but in case the file is a symbolic link,
return the information for the link itself.
Return the information for the file associated with the given
descriptor.
Locking
val lock_command_of_sexp : Sexplib.Sexp.t -> lock_command
val sexp_of_lock_command : lock_command -> Sexplib.Sexp.t
Lock a region for reading, or fail if already locked
lockf fd cmd size place a lock on a file_descr that prevents any other process from
* calling lockf successfully on the same file. Due to a limitation in the current
* implementation the length will be converted to a native int, potentially throwing an
* exception if it is too large.
flock fd cmd places or releases a lock on the fd as per the flock C call of the same
name.
Return true if the given file descriptor refers to a terminal or
console window, false otherwise.
Operations on file names
Removes the named file
rename old new changes the name of a file from old to new.
link ?force ~target ~link_name () creates a hard link named link_name
to the file named target. If force is true, an existing entry in
place of link_name will be unlinked. This unlinking may raise a Unix
error, e.g. if the entry is a directory.
File permissions and ownership
Change the permissions of the named file.
Change the permissions of an opened file.
Change the owner uid and owner gid of the named file.
Change the owner uid and owner gid of an opened file.
Set the process creation mask, and return the previous mask.
Check that the process has the given permissions over the named file.
Operations on file descriptors
Return a new file descriptor referencing the same file as
the given descriptor.
dup2 fd1 fd2 duplicates fd1 to fd2, closing fd2 if already
opened.
Set the ``non-blocking'' flag on the given descriptor.
When the non-blocking flag is set, reading on a descriptor
on which there is temporarily no data available raises the
EAGAIN or EWOULDBLOCK error instead of blocking;
writing on a descriptor on which there is temporarily no room
for writing also raises EAGAIN or EWOULDBLOCK.
Clear the ``non-blocking'' flag on the given descriptor.
See UnixLabels.set_nonblock.
Set the ``close-on-exec'' flag on the given descriptor.
A descriptor with the close-on-exec flag is automatically
closed when the current process starts another program with
one of the exec functions.
Clear the ``close-on-exec'' flag on the given descriptor.
See UnixLabels.set_close_on_exec.
Directories
Create a directory. The permissions of the created directory are (perm & ~umask &
0777). The default perm is 0777.
Create a directory recursively. The permissions of the created directory are
those granted by mkdir ~perm.
Remove an empty directory.
Change the process working directory.
Return the name of the current working directory.
Change the process root directory.
The type of descriptors over opened directories.
Open a descriptor on a directory
Return the next entry in a directory.
Reposition the descriptor to the beginning of the directory
Close a directory descriptor.
Pipes and redirections
Create a pipe. The first component of the result is opened
for reading, that's the exit to the pipe. The second component is
opened for writing, that's the entrance to the pipe.
Create a named pipe with the given permissions.
High-level process and redirection management
Low-level process
create_process ~prog ~args forks a new process that
executes the program prog with arguments args. The function
returns the pid of the process along with file descriptors attached to
stdin, stdout, and stderr of the new process. The executable file
prog is searched for in the path. The new process has the same
environment as the current process. Unlike in execve the program
name is automatically passed as the first argument.
val env_of_sexp : Sexplib.Sexp.t -> env
create_process_env ~prog ~args ~env as create process, but takes an additional
parameter that extends, or replaces the current environment. No effort is made to
ensure that the keys passed in as env are unique, so if an environment variable is set
twice the second version will override the first.
val env_of_sexp__ : Sexplib.Sexp.t -> env
val sexp_of_env : env -> Sexplib.Sexp.t
High-level pipe and process management. These functions
(with UnixLabels.open_process_out and UnixLabels.open_process)
run the given command in parallel with the program,
and return channels connected to the standard input and/or
the standard output of the command. The command is interpreted
by the shell /bin/sh (cf. system). Warning: writes on channels
are buffered, hence be careful to call Pervasives.flush at the right times
to ensure correct synchronization.
See UnixLabels.open_process_in.
See UnixLabels.open_process_in.
Similar to UnixLabels.open_process, but the second argument specifies
the environment passed to the command. The result is a triple
of channels connected to the standard output, standard input,
and standard error of the command.
Close channels opened by UnixLabels.open_process_in,
wait for the associated command to terminate,
and return its termination status.
Close channels opened by UnixLabels.open_process_out,
wait for the associated command to terminate,
and return its termination status.
Close channels opened by UnixLabels.open_process,
wait for the associated command to terminate,
and return its termination status.
Close channels opened by UnixLabels.open_process_full,
wait for the associated command to terminate,
and return its termination status.
Symbolic links
symlink source dest creates the file dest as a symbolic link
to the file source.
Read the contents of a link.
Polling
Wait until some input/output operations become possible on
some channels. The three list arguments are, respectively, a set
of descriptors to check for reading (first argument), for writing
(second argument), or for exceptional conditions (third argument).
The fourth argument is the maximal timeout, in seconds; a
negative fourth argument means no timeout (unbounded wait).
The result is composed of three sets of descriptors: those ready
for reading (first component), ready for writing (second component),
and over which an exceptional condition is pending (third
component).
val sexp_of_select_timeout : select_timeout -> Sexplib.Sexp.t
Setting restart to true means that we want select to restart automatically
on EINTR (instead of propagating the exception)...
Wait until a non-ignored, non-blocked signal is delivered.
Time functions
val process_times_of_sexp : Sexplib.Sexp.t -> process_times
The execution times (CPU times) of a process.
val sexp_of_process_times : process_times -> Sexplib.Sexp.t
val tm_of_sexp : Sexplib.Sexp.t -> tm
The type representing wallclock time and calendar date.
val sexp_of_tm : tm -> Sexplib.Sexp.t
Return the current time since 00:00:00 GMT, Jan. 1, 1970, in seconds.
Same as Unix.time above, but with resolution better than 1 second.
Convert a time in seconds, as returned by UnixLabels.time, into a date and
a time. Assumes UTC.
Convert a UTC time in a tm record to a time in seconds
Convert a time in seconds, as returned by UnixLabels.time, into a date and
a time. Assumes the local time zone.
Convert a date and time, specified by the tm argument, into
a time in seconds, as returned by UnixLabels.time. Also return a normalized
copy of the given tm record, with the tm_wday, tm_yday,
and tm_isdst fields recomputed from the other fields.
The tm argument is interpreted in the local time zone.
Convert a date and time, specified by the tm argument, into a formatted string.
See 'man strftime' for format options.
Given a format string, convert a corresponding string to a date and time
See 'man strptime' for format options.
Schedule a SIGALRM signal after the given number of seconds.
Stop execution for the given number of seconds.
nanosleep f delays execution of the program for at least f seconds. The function
can return earlier if a signal has been delivered, in which case the number of
seconds left is returned. Any other failure raises an exception.
Return the execution times of the process.
Set the last access time (second arg) and last modification time
(third arg) for a file. Times are expressed in seconds from
00:00:00 GMT, Jan. 1, 1970.
val interval_timer_of_sexp : Sexplib.Sexp.t -> interval_timer
The three kinds of interval timers.
val sexp_of_interval_timer : interval_timer -> Sexplib.Sexp.t
(for profiling) decrements both when the process
is running and when the system is running on behalf of the
process; it sends SIGPROF when expired.
val interval_timer_status_of_sexp : Sexplib.Sexp.t -> interval_timer_status
The type describing the status of an interval timer
val sexp_of_interval_timer_status : interval_timer_status -> Sexplib.Sexp.t
Return the current status of the given interval timer.
setitimer t s sets the interval timer t and returns
its previous status. The s argument is interpreted as follows:
s.it_value, if nonzero, is the time to the next timer expiration;
s.it_interval, if nonzero, specifies a value to
be used in reloading it_value when the timer expires.
Setting s.it_value to zero disable the timer.
Setting s.it_interval to zero causes the timer to be disabled
after its next expiration.
User id, group id
It's highly recommended to read the straight unix docs on these functions for more
color. You can get that info from man pages or
http://www.opengroup.org/onlinepubs/000095399/functions/setuid.html
Return the user id of the user executing the process.
Return the effective user id under which the process runs.
Sets the real user id and effective user id for the process. Only use this when
superuser. To setuid as an ordinary user, see Core_extended.Unix.seteuid.
Return the group id of the user executing the process.
Return the effective group id under which the process runs.
Set the real group id and effective group id for the process.
Structure of entries in the passwd database
getpwents is a thread-safe wrapper over the low-level passwd database
functions.
Structure of entries in the groups database.
Return the login name of the user executing the process.
Internet addresses
Conversion from the printable representation of an Internet address to its internal
representation. The argument string consists of 4 numbers separated by periods
(XXX.YYY.ZZZ.TTT) for IPv4 addresses, and up to 8 numbers separated by colons for
IPv6 addresses. Raise Failure when given a string that does not match these
formats.
Call of_string and if that fails, use Host.getbyname.
Return the printable representation of the given Internet address. See of_string
for a description of the printable representation.
A special address, for use only with bind, representing all the Internet addresses
that the host machine possesses.
Special addresses representing the host machine.
Sockets
val bin_socket_domain : socket_domain Bin_prot.Type_class.t
The type of socket domains.
val bin_read_socket_domain : socket_domain Bin_prot.Read_ml.reader
val bin_read_socket_domain_ : socket_domain Bin_prot.Unsafe_read_c.reader
val bin_read_socket_domain__ : (int -> socket_domain) Bin_prot.Unsafe_read_c.reader
val bin_reader_socket_domain : socket_domain Bin_prot.Type_class.reader
val bin_size_socket_domain : socket_domain Bin_prot.Size.sizer
val bin_write_socket_domain : socket_domain Bin_prot.Write_ml.writer
val bin_write_socket_domain_ : socket_domain Bin_prot.Unsafe_write_c.writer
val bin_writer_socket_domain : socket_domain Bin_prot.Type_class.writer
val socket_domain_of_sexp : Sexplib.Sexp.t -> socket_domain
val sexp_of_socket_domain : socket_domain -> Sexplib.Sexp.t
val bin_socket_type : socket_type Bin_prot.Type_class.t
The type of socket kinds, specifying the semantics of
communications.
val bin_read_socket_type : socket_type Bin_prot.Read_ml.reader
val bin_read_socket_type_ : socket_type Bin_prot.Unsafe_read_c.reader
val bin_read_socket_type__ : (int -> socket_type) Bin_prot.Unsafe_read_c.reader
val bin_reader_socket_type : socket_type Bin_prot.Type_class.reader
val bin_size_socket_type : socket_type Bin_prot.Size.sizer
val bin_write_socket_type : socket_type Bin_prot.Write_ml.writer
val bin_write_socket_type_ : socket_type Bin_prot.Unsafe_write_c.writer
val bin_writer_socket_type : socket_type Bin_prot.Type_class.writer
val socket_type_of_sexp : Sexplib.Sexp.t -> socket_type
val sexp_of_socket_type : socket_type -> Sexplib.Sexp.t
val bin_sockaddr : sockaddr Bin_prot.Type_class.t
The type of socket addresses. ADDR_UNIX name is a socket
address in the Unix domain; name is a file name in the file
system. ADDR_INET(addr,port) is a socket address in the Internet
domain; addr is the Internet address of the machine, and
port is the port number.
val bin_read_sockaddr : sockaddr Bin_prot.Read_ml.reader
val bin_read_sockaddr_ : sockaddr Bin_prot.Unsafe_read_c.reader
val bin_read_sockaddr__ : (int -> sockaddr) Bin_prot.Unsafe_read_c.reader
val bin_reader_sockaddr : sockaddr Bin_prot.Type_class.reader
val bin_size_sockaddr : sockaddr Bin_prot.Size.sizer
val bin_write_sockaddr : sockaddr Bin_prot.Write_ml.writer
val bin_write_sockaddr_ : sockaddr Bin_prot.Unsafe_write_c.writer
val bin_writer_sockaddr : sockaddr Bin_prot.Type_class.writer
val sockaddr_of_sexp : Sexplib.Sexp.t -> sockaddr
val sexp_of_sockaddr : sockaddr -> Sexplib.Sexp.t
Return the socket domain adequate for the given socket address.
Create a new socket in the given domain, and with the
given kind. The third argument is the protocol type; 0 selects
the default protocol for that kind of sockets.
Create a pair of unnamed sockets, connected together.
Accept connections on the given socket. The returned descriptor
is a socket connected to the client; the returned address is
the address of the connecting client.
Bind a socket to an address.
Connect a socket to an address.
Set up a socket for receiving connection requests. The integer
argument is the maximal number of pending requests.
val shutdown_command_of_sexp : Sexplib.Sexp.t -> shutdown_command
The type of commands for shutdown.
val sexp_of_shutdown_command : shutdown_command -> Sexplib.Sexp.t
Close both
Shutdown a socket connection. SHUTDOWN_SEND as second argument
causes reads on the other end of the connection to return
an end-of-file condition.
SHUTDOWN_RECEIVE causes writes on the other end of the connection
to return a closed pipe condition (SIGPIPE signal).
Return the address of the given socket.
Return the address of the host connected to the given socket.
val msg_flag_of_sexp : Sexplib.Sexp.t -> msg_flag
The flags for UnixLabels.recv, UnixLabels.recvfrom,
UnixLabels.send and UnixLabels.sendto.
val sexp_of_msg_flag : msg_flag -> Sexplib.Sexp.t
Receive data from an unconnected socket.
Receive data from an unconnected socket.
Send data over an unconnected socket.
Send data over an unconnected socket.
Socket options
val socket_bool_option_of_sexp : Sexplib.Sexp.t -> socket_bool_option
The socket options that can be consulted with UnixLabels.getsockopt
and modified with UnixLabels.setsockopt. These options have a boolean
(true/false) value.
val sexp_of_socket_bool_option : socket_bool_option -> Sexplib.Sexp.t
Forbid binding an IPv6 socket to an IPv4 address
val socket_int_option_of_sexp : Sexplib.Sexp.t -> socket_int_option
The socket options that can be consulted with UnixLabels.getsockopt_int
and modified with UnixLabels.setsockopt_int. These options have an
integer value.
val sexp_of_socket_int_option : socket_int_option -> Sexplib.Sexp.t
The socket options that can be consulted with UnixLabels.getsockopt_optint
and modified with UnixLabels.setsockopt_optint. These options have a
value of type int option, with None meaning ``disabled''.
Whether to linger on closed connections
with sexp that have data present, and for how long
(in seconds)
val socket_float_option_of_sexp : Sexplib.Sexp.t -> socket_float_option
The socket options that can be consulted with UnixLabels.getsockopt_float
and modified with UnixLabels.setsockopt_float. These options have a
floating-point value representing a time in seconds.
The value 0 means infinite timeout.
val sexp_of_socket_float_option : socket_float_option -> Sexplib.Sexp.t
Timeout for output operations
Return the current status of a boolean-valued option
in the given socket.
Set or clear a boolean-valued option in the given socket.
Same as UnixLabels.getsockopt for an integer-valued socket option.
Same as UnixLabels.setsockopt for an integer-valued socket option.
Same as UnixLabels.getsockopt for a socket option whose value is an int option.
Same as UnixLabels.setsockopt for a socket option whose value is an int option.
Same as UnixLabels.getsockopt for a socket option whose value is a floating-point
number.
Same as UnixLabels.setsockopt for a socket option whose value is a floating-point
number.
High-level network connection functions
Connect to a server at the given address.
Return a pair of buffered channels connected to the server.
Remember to call Pervasives.flush on the output channel at the right times
to ensure correct synchronization.
``Shut down'' a connection established with UnixLabels.open_connection;
that is, transmit an end-of-file condition to the server reading
on the other side of the connection.
Establish a server on the given address.
The function given as first argument is called for each connection
with two buffered channels connected to the client. A new process
is created for each connection. The function UnixLabels.establish_server
never returns normally.
Host and protocol databases
Return the name of the local host.
Structure of entries in the hosts database.
Find an entry in hosts with the given name.
NOTE: This function is not thread safe with certain versions of winbind using "wins"
name resolution.
Find an entry in hosts with the given address.
Structure of entries in the protocols database.
Find an entry in protocols with the given name.
Find an entry in protocols with the given protocol number.
Structure of entries in the services database.
Find an entry in services with the given name.
Find an entry in services with the given service number.
val addr_info_of_sexp : Sexplib.Sexp.t -> addr_info
Address information returned by Unix.getaddrinfo.
val sexp_of_addr_info : addr_info -> Sexplib.Sexp.t
val getaddrinfo_option_of_sexp : Sexplib.Sexp.t -> getaddrinfo_option
Options to Unix.getaddrinfo.
val sexp_of_getaddrinfo_option : getaddrinfo_option -> Sexplib.Sexp.t
getaddrinfo host service opts returns a list of Unix.addr_info
records describing socket parameters and addresses suitable for
communicating with the given host and service. The empty list is
returned if the host or service names are unknown, or the constraints
expressed in opts cannot be satisfied.
host is either a host name or the string representation of an IP
address. host can be given as the empty string; in this case,
the ``any'' address or the ``loopback'' address are used,
depending whether opts contains AI_PASSIVE.
service is either a service name or the string representation of
a port number. service can be given as the empty string;
in this case, the port field of the returned addresses is set to 0.
opts is a possibly empty list of options that allows the caller
to force a particular socket domain (e.g. IPv6 only, or IPv4 only)
or a particular socket type (e.g. TCP only or UDP only).
val name_info_of_sexp : Sexplib.Sexp.t -> name_info
Host and service information returned by Unix.getnameinfo.
val sexp_of_name_info : name_info -> Sexplib.Sexp.t
Name of service or port number
val getnameinfo_option_of_sexp : Sexplib.Sexp.t -> getnameinfo_option
Options to Unix.getnameinfo.
val sexp_of_getnameinfo_option : getnameinfo_option -> Sexplib.Sexp.t
getnameinfo addr opts returns the host name and service name
corresponding to the socket address addr. opts is a possibly
empty list of options that governs how these names are obtained.
Raise Not_found if an error occurs.
Getting terminal size
Terminal interface
The following functions implement the POSIX standard terminal
interface. They provide control over asynchronous communication ports
and pseudo-terminals. Refer to the termios man page for a complete
description.
Ignore the break condition.
Signal interrupt on break condition.
Ignore characters with parity errors.
Mark parity errors.
Enable parity check on input.
Strip 8th bit on input characters.
Map NL to CR on input.
Ignore CR on input.
Map CR to NL on input.
Recognize XON/XOFF characters on input.
Emit XON/XOFF chars to control input flow.
Enable output processing.
Output baud rate (0 means close connection).
Input baud rate.
Number of bits per character (5-8).
Number of stop bits (1-2).
Reception is enabled.
Enable parity generation and detection.
Specify odd parity instead of even.
Hang up on last close.
Ignore modem status lines.
Generate signal on INTR, QUIT, SUSP.
Enable canonical processing
(line buffering and editing)
Disable flush after INTR, QUIT, SUSP.
Echo input characters.
Echo ERASE (to erase previous character).
Echo KILL (to erase the current line).
Echo NL even if c_echo is not set.
Interrupt character (usually ctrl-C).
Quit character (usually ctrl-\).
Erase character (usually DEL or ctrl-H).
Kill line character (usually ctrl-U).
End-of-file character (usually ctrl-D).
Alternate end-of-line char. (usually none).
Minimum number of characters to read
before the read request is satisfied.
Maximum read wait (in 0.1s units).
Start character (usually ctrl-Q).
Stop character (usually ctrl-S).
Return the status of the terminal referred to by the given
file descriptor.
Set the status of the terminal referred to by the given
file descriptor. The second argument indicates when the
status change takes place: immediately (TCSANOW),
when all pending output has been transmitted (TCSADRAIN),
or after flushing all input that has been received but not
read (TCSAFLUSH). TCSADRAIN is recommended when changing
the output parameters; TCSAFLUSH, when changing the input
parameters.
Send a break condition on the given file descriptor.
The second argument is the duration of the break, in 0.1s units;
0 means standard duration (0.25s).
Waits until all output written on the given file descriptor
has been transmitted.
Discard data written on the given file descriptor but not yet
transmitted, or data received but not yet read, depending on the
second argument: TCIFLUSH flushes data received but not read,
TCOFLUSH flushes data written but not transmitted, and
TCIOFLUSH flushes both.
Suspend or restart reception or transmission of data on
the given file descriptor, depending on the second argument:
TCOOFF suspends output, TCOON restarts output,
TCIOFF transmits a STOP character to suspend input,
and TCION transmits a START character to restart input.
Put the calling process in a new session and detach it from
its controlling terminal.
Get a sockaddr from a hostname or IP, and a port
Set a timeout for a socket associated with an in_channel
Set a timeout for a socket associated with an out_channel
exit_immediately exit_code immediately calls the exit system call with the given
exit code without performing any other actions (unlike Pervasives.exit). Does not
return.
Filesystem functions
mknod ?file_kind ?perm ?major ?minor path creates a filesystem
entry. Note that only FIFO-entries are guaranteed to be supported
across all platforms as required by the POSIX-standard. On Linux
directories and symbolic links cannot be created with this function.
Use Unix.mkdir and Unix.symlink instead there respectively.
I/O vectors
I/O-vectors for scatter/gather-operations
Representation of I/O-vectors.
NOTE: DO NOT CHANGE THE MEMORY LAYOUT OF THIS TYPE!!!
All C-functions in our bindings that handle I/O-vectors depend on it.
Buffer holding the I/O-vector
Position of I/O-vector in buffer
Length of I/O-vector in buffer
Kind of I/O-vector buffers
empty the empty I/O-vector.
of_string ?pos ?len str
of_bigstring ?pos ?len bstr
drop iovec n drops n characters from iovec.
I/O functions
Extract a file descriptor from a directory handle.
Synchronize all filesystem buffers with disk.
Synchronize the kernel buffers of a given file descriptor with disk,
but do not necessarily write file attributes.
readdir_ino dh return the next entry in a directory (((filename,
inode)).
read_assume_fd_is_nonblocking fd ?pos ?len buf calls the system call
read ASSUMING THAT IT IS NOT GOING TO BLOCK. Reads at most len
bytes into buffer buf starting at position pos.
write_assume_fd_is_nonblocking fd ?pos ?len buf calls the system call
write ASSUMING THAT IT IS NOT GOING TO BLOCK. Writes at most len
bytes from buffer buf starting at position pos.
writev_assume_fd_is_nonblocking fd ?count iovecs calls the system call
writev ASSUMING THAT IT IS NOT GOING TO BLOCK using count
I/O-vectors iovecs.
writev fd ?count iovecs like Unix.writev_assume_fd_is_nonblocking, but does
not require the descriptor to not block. If you feel you have to
use this function, you should probably have chosen I/O-vectors that
build on bigstrings, because this function has to internally blit
the I/O-vectors (ordinary OCaml strings) to intermediate buffers on
the C-heap.
pselect rfds wfds efds timeout sigmask like Unix.select but
also allows one to wait for the arrival of signals.
Resource limits
Resource usage
-- For details, "man getrusage"
add ru1 ru2 adds two rusage structures (e.g. your resource usage
and your children's).
val sysconf_of_sexp : Sexplib.Sexp.t -> sysconf
System configuration
val sexp_of_sysconf : sysconf -> Sexplib.Sexp.t
Temporary file and directory creation
mkstemp prefix creates and opens a unique temporary file with
prefix, automatically appending a suffix of six random characters
to make the name unique.
mkdtemp prefix creates a temporary directory with prefix,
automatically appending a suffix of six random characters to make
the name unique.
Signal handling
User id, group id
getgrouplist user group returns the list of groups to which user belongs.
See 'man getgrouplist'.
Return the list of groups to which the user executing the process belongs.
Globbing and shell expansion
Additional IP functionality
mcast_join ?ifname sock addr join a multicast group at addr
with socket sock, optionally using network interface ifname.
mcast_leave ?ifname sock addr leaves a multicast group at addr
with socket sock, optionally using network interface ifname.