Module Bigstring

module Bigstring: sig .. end

String type based on Bigarray, for use in I/O and C-bindings

include Core_kernel.Std.Bigstring

exception IOError of int * exn

Type of I/O errors

The occurred exception (e.g. Unix_error, End_of_file)

val read : ?min_len:int -> Unix.file_descr -> ?pos:int -> ?len:int -> t -> int

read ?min_len fd ?pos ?len bstr reads at least min_len (must be greater than or equal zero) and at most len (must be greater than or equal to min_len) bytes from file descriptor fd, and writes them to bigstring bstr starting at position pos.
Raises

• Invalid_argument if the designated ranges are out of bounds.
• IOError in the case of input errors, or on EOF if the minimum length could not be read.

Returns the number of bytes actually read.

NOTE: even if len is zero, there may still be errors when reading from the descriptor!

val really_read : Unix.file_descr -> ?pos:int -> ?len:int -> t -> unit

really_read fd ?pos ?len bstr reads len bytes from file descriptor fd, and writes them to bigstring bstr starting at position pos.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on EOF.

val really_recv : Unix.file_descr -> ?pos:int -> ?len:int -> t -> unit

really_recv sock ?pos ?len bstr receives len bytes from socket sock, and writes them to bigstring bstr starting at position pos. If len is zero, the function returns immediately without performing the underlying system call.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on EOF.

val recvfrom_assume_fd_is_nonblocking : Unix.file_descr -> ?pos:int -> ?len:int -> t -> int * Unix.sockaddr

recvfrom_assume_fd_is_nonblocking sock ?pos ?len bstr reads up to len bytes into bigstring bstr starting at position pos from socket sock without yielding to other OCaml-threads.
Raises

• Unix_error in the case of input errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of bytes actually read and the socket address of the client.

val read_assume_fd_is_nonblocking : Unix.file_descr -> ?pos:int -> ?len:int -> t -> int

read_assume_fd_is_nonblocking fd ?pos ?len bstr reads up to len bytes into bigstring bstr starting at position pos from file descriptor fd without yielding to other OCaml-threads.
Raises

• Unix_error in the case of input errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of bytes actually read.

val pread_assume_fd_is_nonblocking : Unix.file_descr -> offset:int -> ?pos:int -> ?len:int -> t -> int

pread_assume_fd_is_nonblocking fd ~offset ?pos ?len bstr reads up to len bytes from file descriptor fd at offset offset, and writes them to bigstring bstr starting at position pos. The fd must be capable of seeking, and the current file offset used for a regular read() is unchanged. Please see 'man pread' for more information.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on EOF.

Returns the number of bytes actually read.

val input : ?min_len:int -> Pervasives.in_channel -> ?pos:int -> ?len:int -> t -> int

input ?min_len ic ?pos ?len bstr tries to read len bytes (guarantees to read at least min_len bytes (must be greater than or equal to zero and smaller or equal to len), if possible, before returning) from input channel ic, and writes them to bigstring bstr starting at position pos.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on premature EOF.

Returns the number of bytes actually read.

NOTE: even if len is zero, there may still be errors when reading from the descriptor, which will be done if the internal buffer is empty!

NOTE: if at least len characters are available in the input channel buffer and if len is not zero, data will only be fetched from the channel buffer. Otherwise data will be read until at least min_len characters are available.

val really_input : Pervasives.in_channel -> ?pos:int -> ?len:int -> t -> unit

really_input ic ?pos ?len bstr reads exactly len bytes from input channel ic, and writes them to bigstring bstr starting at position pos.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on premature EOF.

val really_write : Unix.file_descr -> ?pos:int -> ?len:int -> t -> unit

really_write fd ?pos ?len bstr writes len bytes in bigstring bstr starting at position pos to file descriptor fd.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of output errors.

val really_send_no_sigpipe : (Unix.file_descr -> ?pos:int -> ?len:int -> t -> unit)
       Core_kernel.Std.Or_error.t

really_send_no_sigpipe sock ?pos ?len bstr sends len bytes in bigstring bstr starting at position pos to socket sock without blocking and ignoring SIGPIPE.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of output errors.

val send_nonblocking_no_sigpipe : (Unix.file_descr -> ?pos:int -> ?len:int -> t -> int option)
       Core_kernel.Std.Or_error.t

send_nonblocking_no_sigpipe sock ?pos ?len bstr tries to send len bytes in bigstring bstr starting at position pos to socket sock.
Raises

• Invalid_argument if the designated range is out of bounds.
• Unix_error in the case of output errors.

Returns Some bytes_written, or None if the operation would have blocked.

val sendto_nonblocking_no_sigpipe : (Unix.file_descr -> ?pos:int -> ?len:int -> t -> Unix.sockaddr -> int option)
       Core_kernel.Std.Or_error.t

sendto_nonblocking_no_sigpipe sock ?pos ?len bstr sockaddr tries to send len bytes in bigstring bstr starting at position pos to socket sock using address addr.
Raises

• Invalid_argument if the designated range is out of bounds.
• Unix_error in the case of output errors.

Returns Some bytes_written, or None if the operation would have blocked.

val write : Unix.file_descr -> ?pos:int -> ?len:int -> t -> int

write fd ?pos ?len bstr writes len bytes in bigstring bstr starting at position pos to file descriptor fd.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of bytes actually written.

val pwrite_assume_fd_is_nonblocking : Unix.file_descr -> offset:int -> ?pos:int -> ?len:int -> t -> int

pwrite_assume_fd_is_nonblocking fd ~offset ?pos ?len bstr writes up to len bytes of bigstring bstr starting at position pos to file descriptor fd at position offset. The fd must be capable of seeking, and the current file offset used for non-positional read()/write() calls is unchanged.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of input errors, or on EOF.

Returns the number of bytes written.

val write_assume_fd_is_nonblocking : Unix.file_descr -> ?pos:int -> ?len:int -> t -> int

write_assume_fd_is_nonblocking fd ?pos ?len bstr writes len bytes in bigstring bstr starting at position pos to file descriptor fd without yielding to other OCaml-threads.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of bytes actually written.

val writev : Unix.file_descr -> ?count:int -> t Core_unix.IOVec.t array -> int

writev fd ?count iovecs writes count iovecs of bigstrings to file descriptor fd.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if count is out of range.

Returns the number of bytes written.

val writev_assume_fd_is_nonblocking : Unix.file_descr -> ?count:int -> t Core_unix.IOVec.t array -> int

writev_assume_fd_is_nonblocking fd ?count iovecs writes count iovecs of bigstrings to file descriptor fd without yielding to other OCaml-threads.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of bytes actually written.

val recvmmsg_assume_fd_is_nonblocking : (Unix.file_descr ->
        ?count:int ->
        ?srcs:Unix.sockaddr array ->
        t Core_unix.IOVec.t array -> lens:int array -> int)
       Core_kernel.Std.Or_error.t

recvmmsg_assume_fd_is_nonblocking fd iovecs ~count ~lens receives up to count messages into iovecs from file descriptor fd without yielding to other OCaml threads. If ~count is supplied, it must be that 0 <= count <= Array.length iovecs. If ~srcs is supplied, save the source addresses for corresponding recieved messages there. If supplied, Array.length srcs must be >= count. Save the lengths of the received messages in lens. It is required that Array.length lens >= count.

If an IOVec isn't long enough for its corresponding message, excess bytes may be discarded, depending on the type of socket the message is received from. While the recvmmsg system call itself does return details of such truncation, etc., those details are not (yet) passed through this interface.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if the designated range is out of bounds.

Returns the number of messages actually read.
See also recvmmsg(2) re. the underlying system call.

val sendmsg_nonblocking_no_sigpipe : (Unix.file_descr -> ?count:int -> t Core_unix.IOVec.t array -> int option)
       Core_kernel.Std.Or_error.t

sendmsg_nonblocking_no_sigpipe sock ?count iovecs sends count iovecs of bigstrings to socket sock.
Raises

• Unix_error in the case of output errors.
• Invalid_argument if count is out of range.

Returns Some bytes_written, or None if the operation would have blocked. This system call will not cause signal SIGPIPE if an attempt is made to write to a socket that was closed by the other side.

val output : ?min_len:int -> Pervasives.out_channel -> ?pos:int -> ?len:int -> t -> int

output ?min_len oc ?pos ?len bstr tries to output len bytes (guarantees to write at least min_len bytes (must be equal to or greater than zero), if possible, before returning) from bigstring bstr starting at position pos to output channel oc.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of output errors. The IOError-argument counting the number of successful bytes includes those that have been transferred to the channel buffer before the error.

Returns the number of bytes actually written.

NOTE: you may need to flush oc to make sure that the data is actually sent.

NOTE: if len characters fit into the channel buffer completely, they will be buffered. Otherwise writes will be attempted until at least min_len characters have been sent.

val really_output : Pervasives.out_channel -> ?pos:int -> ?len:int -> t -> unit

really_output oc ?pos ?len bstr outputs exactly len bytes from bigstring bstr starting at position pos to output channel oc.
Raises

• Invalid_argument if the designated range is out of bounds.
• IOError in the case of output errors. The IOError-argument counting the number of successful bytes includes those that have been transferred to the channel buffer before the error.

val unsafe_read_assume_fd_is_nonblocking : Unix.file_descr -> pos:int -> len:int -> t -> int

unsafe_read_assume_fd_is_nonblocking fd ~pos ~len bstr similar to Bigstring.read_assume_fd_is_nonblocking, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_write : Unix.file_descr -> pos:int -> len:int -> t -> int

unsafe_write fd ~pos ~len bstr similar to Bigstring.write, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_write_assume_fd_is_nonblocking : Unix.file_descr -> pos:int -> len:int -> t -> int

unsafe_write_assume_fd_is_nonblocking fd ~pos ~len bstr similar to Bigstring.write_assume_fd_is_nonblocking, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_read : min_len:int -> Unix.file_descr -> pos:int -> len:int -> t -> int

unsafe_read ~min_len fd ~pos ~len bstr similar to Bigstring.read, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_really_recv : Unix.file_descr -> pos:int -> len:int -> t -> unit

unsafe_really_recv sock ~pos ~len bstr similar to Bigstring.really_recv, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_really_write : Unix.file_descr -> pos:int -> len:int -> t -> unit

unsafe_really_write fd ~pos ~len bstr similar to Bigstring.write, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_really_send_no_sigpipe : (Unix.file_descr -> pos:int -> len:int -> t -> unit)
       Core_kernel.Std.Or_error.t

unsafe_really_send_no_sigpipe sock ~pos ~len bstr similar to Bigstring.send, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_send_nonblocking_no_sigpipe : (Unix.file_descr -> pos:int -> len:int -> t -> int option)
       Core_kernel.Std.Or_error.t

unsafe_send_nonblocking_no_sigpipe sock ~pos ~len bstr similar to Bigstring.send_nonblocking_no_sigpipe, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_writev : Unix.file_descr -> t Core_unix.IOVec.t array -> int -> int

unsafe_writev fd iovecs count similar to Bigstring.writev, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_sendmsg_nonblocking_no_sigpipe : (Unix.file_descr -> t Core_unix.IOVec.t array -> int -> int option)
       Core_kernel.Std.Or_error.t

unsafe_sendmsg_nonblocking_no_sigpipe fd iovecs count similar to Bigstring.sendmsg_nonblocking_no_sigpipe, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_input : min_len:int -> Pervasives.in_channel -> pos:int -> len:int -> t -> int

unsafe_input ~min_len ic ~pos ~len bstr similar to Bigstring.input, but does not perform any bounds checks. Will crash on bounds errors!

val unsafe_output : min_len:int -> Pervasives.out_channel -> pos:int -> len:int -> t -> int

unsafe_output ~min_len oc ~pos ~len bstr similar to Bigstring.output, but does not perform any bounds checks. Will crash on bounds errors!