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module Bigstring

: sig

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

include module type of Core_kernel.Std.Bigstring with type t = Core_kernel.Std.Bigstring.t
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exception IOError of int * exn

Type of I/O errors

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

Input functions
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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.

Returns the number of bytes actually read.
read returns zero only if len = 0. If len > 0 and there's nothing left to read, read raises to indicate EOF even if min_len = 0.
NOTE: even if len is zero, there may still be errors when reading from the descriptor!
Raises Invalid_argument if the designated ranges are out of bounds.
Raises IOError in the case of input errors, or on EOF if the minimum length could not be read.
pos default = 0
min_len default = 0
len default = length bstr - pos
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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.
Raises IOError in the case of input errors, or on EOF.
pos default = 0
len default = length bstr - pos
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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.
Raises IOError in the case of input errors, or on EOF.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes actually read and the socket address of the client.
Raises Unix_error in the case of input errors.
Raises Invalid_argument if the designated range is out of bounds.
pos default = 0
len default = length bstr - pos
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val read_assume_fd_is_nonblocking : Unix.file_descr -> ?pos:int -> ?len:int -> t -> Syscall_result.Int.t

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.

Returns the number of bytes actually read.
Raises Invalid_argument if the designated range is out of bounds.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes actually read.
Raises Invalid_argument if the designated range is out of bounds.
Raises Unix_error in the case of input errors.
pos default = 0
len default = length bstr - pos
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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.

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.
Raises Invalid_argument if the designated range is out of bounds.
Raises IOError in the case of input errors, or on premature EOF.
pos default = 0
min_len default = 0
len default = length bstr - pos
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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.
Raises IOError in the case of input errors, or on premature EOF.
pos default = 0
len default = length bstr - pos
Output functions
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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.
Raises IOError in the case of output errors.
pos default = 0
len default = length bstr - pos
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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.
Raises IOError in the case of output errors.
pos default = 0
len default = length bstr - pos
really_send_no_sigpipe is not implemented on some platforms, in which case it is an Error value that indicates that it is unimplemented.
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val send_nonblocking_no_sigpipe : (Unix.file_descr -> ?pos:int -> ?len:int -> t -> Syscall_result.Int.t) 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.

Returns bytes_written.
Raises Invalid_argument if the designated range is out of bounds.
pos default = 0
len default = length bstr - pos
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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.

Returns Some bytes_written, or None if the operation would have blocked.
Raises Invalid_argument if the designated range is out of bounds.
Raises Unix_error in the case of output errors.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes actually written.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if the designated range is out of bounds.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes written.
Raises Invalid_argument if the designated range is out of bounds.
Raises Unix_error in the case of input errors.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes actually written.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if the designated range is out of bounds.
pos default = 0
len default = length bstr - pos
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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.

Returns the number of bytes written.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if count is out of range.
count default = Array.length iovecs
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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.

Returns the number of bytes actually written.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if the designated range is out of bounds.
count default = Array.length iovecs
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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.

See also DOC recvmmsg(2) re. the underlying system call.
Returns the number of messages actually read, or a negative number to indicate EWOULDBLOCK or EAGAIN. This is a compromise to mitigate the exception overhead for what ends up being a very common result with our use of recvmmsg.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if the designated range is out of bounds.
count default = Array.length iovecs
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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.

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.
Raises Unix_error in the case of output errors.
Raises Invalid_argument if count is out of range.
count default = Array.length iovecs
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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.

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.
Raises Invalid_argument if the designated range is out of bounds.
Raises 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.
pos default = 0
min_len default = 0
len default = length bstr - pos
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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.
Raises 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.
pos default = 0
len default = length bstr - pos
Unsafe functions
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external unsafe_read_assume_fd_is_nonblocking : Unix.file_descr -> pos:int -> len:int -> t -> Syscall_result.Int.t = "bigstring_read_assume_fd_is_nonblocking_stub"

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!

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external unsafe_write : Unix.file_descr -> pos:int -> len:int -> t -> int = "bigstring_write_stub"

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

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external unsafe_write_assume_fd_is_nonblocking : Unix.file_descr -> pos:int -> len:int -> t -> int = "bigstring_write_assume_fd_is_nonblocking_stub"

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!

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external unsafe_read : min_len:int -> Unix.file_descr -> pos:int -> len:int -> t -> int = "bigstring_read_stub"

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

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external unsafe_really_recv : Unix.file_descr -> pos:int -> len:int -> t -> unit = "bigstring_really_recv_stub"

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

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external unsafe_really_write : Unix.file_descr -> pos:int -> len:int -> t -> unit = "bigstring_really_write_stub"

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

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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!

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val unsafe_send_nonblocking_no_sigpipe : (Unix.file_descr -> pos:int -> len:int -> t -> Syscall_result.Int.t) 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!

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external unsafe_writev : Unix.file_descr -> t Core_unix.IOVec.t array -> int -> int = "bigstring_writev_stub"

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

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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!

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external unsafe_input : min_len:int -> Pervasives.in_channel -> pos:int -> len:int -> t -> int = "bigstring_input_stub"

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

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external unsafe_output : min_len:int -> Pervasives.out_channel -> pos:int -> len:int -> t -> int = "bigstring_output_stub"

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

end