package core_unix

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package core_unix
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include module type of struct include Bigstring_unix end

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

include module type of struct include Core_kernel.Bigstring end

Types and exceptions

Type of bigstrings

type t_frozen = t

Type of bigstrings which support hashing. Note that mutation invalidates previous hashes.

include module type of Base_bigstring with type t := t and type t_frozen := t_frozen

Types and exceptions

val compare : t -> t -> Base.int
include Ppx_sexp_conv_lib.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> t
val sexp_of_t : t -> Sexplib0.Sexp.t
val compare_t_frozen : t_frozen -> t_frozen -> Base.int
val hash_fold_t_frozen : Base.Hash.state -> t_frozen -> Base.Hash.state
val hash_t_frozen : t_frozen -> Base.Hash.hash_value
val sexp_of_t_frozen : t_frozen -> Ppx_sexp_conv_lib.Sexp.t
val t_frozen_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> t_frozen
include Base.Equal.S with type t := t
val equal : t Base.Equal.equal

Creation and string conversion

val init : Base.int -> f:(Base.int -> Base.char) -> t

init n ~f creates a bigstring t of length n, with t.{i} = f i.

val of_string : ?pos:Base.int -> ?len:Base.int -> Base.string -> t

of_string ?pos ?len str

  • returns

    a new bigstring that is equivalent to the substring of length len in str starting at position pos.

  • parameter pos

    default = 0

  • parameter len

    default = String.length str - pos

val of_bytes : ?pos:Base.int -> ?len:Base.int -> Base.bytes -> t

of_bytes ?pos ?len str

  • returns

    a new bigstring that is equivalent to the subbytes of length len in str starting at position pos.

  • parameter pos

    default = 0

  • parameter len

    default = Bytes.length str - pos

val to_string : ?pos:Base.int -> ?len:Base.int -> t -> Base.string

to_string ?pos ?len bstr

  • returns

    a new string that is equivalent to the substring of length len in bstr starting at position pos.

  • parameter pos

    default = 0

  • parameter len

    default = length bstr - pos

val to_bytes : ?pos:Base.int -> ?len:Base.int -> t -> Base.bytes

to_bytes ?pos ?len bstr

  • returns

    a new byte sequence that is equivalent to the substring of length len in bstr starting at position pos.

  • parameter pos

    default = 0

  • parameter len

    default = length bstr - pos

val concat : ?sep:t -> t Base.list -> t

concat ?sep list returns the concatenation of list with sep in between each.

Checking

val check_args : loc:Base.string -> pos:Base.int -> len:Base.int -> t -> Base.unit

check_args ~loc ~pos ~len bstr checks the position and length arguments pos and len for bigstrings bstr.

  • raises

    Invalid_argument if these arguments are illegal for the given bigstring using loc to indicate the calling context.

val get_opt_len : t -> pos:Base.int -> Base.int Base.option -> Base.int

get_opt_len bstr ~pos opt_len

  • returns

    the length of a subbigstring in bstr starting at position pos and given optional length opt_len. This function does not check the validity of its arguments. Use check_args for that purpose.

Accessors

val length : t -> Base.int

length bstr

  • returns

    the length of bigstring bstr.

val get : t -> Base.int -> Base.char

get t pos returns the character at pos

val set : t -> Base.int -> Base.char -> Base.unit

set t pos sets the character at pos

val is_mmapped : t -> Base.bool

is_mmapped bstr

  • returns

    whether the bigstring bstr is memory-mapped.

Blitting

blit ~src ?src_pos ?src_len ~dst ?dst_pos () blits src_len characters from src starting at position src_pos to dst at position dst_pos.

include Base.Blit.S with type t := t
val blit : src:t -> src_pos:int -> dst:t -> dst_pos:int -> len:int -> unit
val blito : src:t -> ?src_pos:int -> ?src_len:int -> dst:t -> ?dst_pos:int -> unit -> unit
val unsafe_blit : src:t -> src_pos:int -> dst:t -> dst_pos:int -> len:int -> unit
val sub : t -> pos:int -> len:int -> t
val subo : ?pos:int -> ?len:int -> t -> t
val copy : t -> t
module To_string = Bigstring_unix.To_string
module From_string = Bigstring_unix.From_string
module To_bytes = Bigstring_unix.To_bytes
module From_bytes = Bigstring_unix.From_bytes
val memset : t -> pos:Base.int -> len:Base.int -> Base.char -> Base.unit

memset t ~pos ~len c fills t with c within the range [pos, pos + len).

Memcmp

val memcmp : t -> pos1:Base.int -> t -> pos2:Base.int -> len:Base.int -> Base.int

memcmp t1 ~pos1 t2 ~pos2 ~len is like compare t1 t2 except performs the comparison on the subregions of t1 and t2 defined by pos1, pos2, and len.

val find : ?pos:Base.int -> ?len:Base.int -> Base.char -> t -> Base.int Base.option

find ?pos ?len char t returns Some i for the smallest i >= pos such that t.{i} = char, or None if there is no such i.

  • parameter pos

    default = 0

  • parameter len

    default = length bstr - pos

val unsafe_find : t -> Base.char -> pos:Base.int -> len:Base.int -> Base.int

Same as find, but does no bounds checking, and returns a negative value instead of None if char is not found.

Accessors for parsing binary values, analogous to Binary_packing

These are in Bigstring rather than a separate module because:

1. Existing Binary_packing requires copies and does not work with bigstrings. 2. The accessors rely on the implementation of bigstring, and hence should change should the implementation of bigstring move away from Bigarray. 3. Bigstring already has some external C functions, so it didn't require many changes to the jbuild ^_^.

In a departure from Binary_packing, the naming conventions are chosen to be close to C99 stdint types, as it's a more standard description and it is somewhat useful in making compact macros for the implementations. The accessor names contain endian-ness to allow for branch-free implementations

<accessor> ::= <unsafe><operation><type><endian> <unsafe> ::= unsafe_ | '' <operation> ::= get_ | set_ <type> ::= int8 | uint8 | int16 | uint16 | int32 | uint32 | int64 | uint64 <endian> ::= _le | _be | ''

The unsafe_ prefix indicates that these functions do no bounds checking and silently truncate out-of-range numeric arguments.

val get_int8 : t -> pos:Base.int -> Base.int
val set_int8_exn : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint8 : t -> pos:Base.int -> Base.int
val set_uint8_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int8 : t -> pos:Base.int -> Base.int
val unsafe_set_int8 : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint8 : t -> pos:Base.int -> Base.int
val unsafe_set_uint8 : t -> pos:Base.int -> Base.int -> Base.unit

16-bit methods

val get_int16_le : t -> pos:Base.int -> Base.int
val get_int16_be : t -> pos:Base.int -> Base.int
val set_int16_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_int16_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int16_le : t -> pos:Base.int -> Base.int
val unsafe_get_int16_be : t -> pos:Base.int -> Base.int
val unsafe_set_int16_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int16_be : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint16_le : t -> pos:Base.int -> Base.int
val get_uint16_be : t -> pos:Base.int -> Base.int
val set_uint16_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint16_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint16_le : t -> pos:Base.int -> Base.int
val unsafe_get_uint16_be : t -> pos:Base.int -> Base.int
val unsafe_set_uint16_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint16_be : t -> pos:Base.int -> Base.int -> Base.unit

32-bit methods

val get_int32_le : t -> pos:Base.int -> Base.int
val get_int32_be : t -> pos:Base.int -> Base.int
val set_int32_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_int32_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int32_le : t -> pos:Base.int -> Base.int
val unsafe_get_int32_be : t -> pos:Base.int -> Base.int
val unsafe_set_int32_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int32_be : t -> pos:Base.int -> Base.int -> Base.unit
val get_uint32_le : t -> pos:Base.int -> Base.int
val get_uint32_be : t -> pos:Base.int -> Base.int
val set_uint32_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint32_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint32_le : t -> pos:Base.int -> Base.int
val unsafe_get_uint32_be : t -> pos:Base.int -> Base.int
val unsafe_set_uint32_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint32_be : t -> pos:Base.int -> Base.int -> Base.unit

Similar to the usage in binary_packing, the below methods are treating the value being read (or written), as an ocaml immediate integer, as such it is actually 63 bits. If the user is confident that the range of values used in practice will not require 64-bit precision (i.e. Less than Max_Long), then we can avoid allocation and use an immediate. If the user is wrong, an exception will be thrown (for get).

64-bit signed values

val get_int64_le_exn : t -> pos:Base.int -> Base.int
val get_int64_be_exn : t -> pos:Base.int -> Base.int
val get_int64_le_trunc : t -> pos:Base.int -> Base.int
val get_int64_be_trunc : t -> pos:Base.int -> Base.int
val set_int64_le : t -> pos:Base.int -> Base.int -> Base.unit
val set_int64_be : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_int64_le_exn : t -> pos:Base.int -> Base.int
val unsafe_get_int64_be_exn : t -> pos:Base.int -> Base.int
val unsafe_get_int64_le_trunc : t -> pos:Base.int -> Base.int
val unsafe_get_int64_be_trunc : t -> pos:Base.int -> Base.int
val unsafe_set_int64_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_int64_be : t -> pos:Base.int -> Base.int -> Base.unit

64-bit unsigned values

val get_uint64_be_exn : t -> pos:Base.int -> Base.int
val get_uint64_le_exn : t -> pos:Base.int -> Base.int
val set_uint64_le_exn : t -> pos:Base.int -> Base.int -> Base.unit
val set_uint64_be_exn : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_get_uint64_be_exn : t -> pos:Base.int -> Base.int
val unsafe_get_uint64_le_exn : t -> pos:Base.int -> Base.int
val unsafe_set_uint64_le : t -> pos:Base.int -> Base.int -> Base.unit
val unsafe_set_uint64_be : t -> pos:Base.int -> Base.int -> Base.unit

32-bit methods with full precision

val get_int32_t_le : t -> pos:Base.int -> Base.Int32.t
val get_int32_t_be : t -> pos:Base.int -> Base.Int32.t
val set_int32_t_le : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val set_int32_t_be : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val unsafe_get_int32_t_le : t -> pos:Base.int -> Base.Int32.t
val unsafe_get_int32_t_be : t -> pos:Base.int -> Base.Int32.t
val unsafe_set_int32_t_le : t -> pos:Base.int -> Base.Int32.t -> Base.unit
val unsafe_set_int32_t_be : t -> pos:Base.int -> Base.Int32.t -> Base.unit

64-bit methods with full precision

val get_int64_t_le : t -> pos:Base.int -> Base.Int64.t
val get_int64_t_be : t -> pos:Base.int -> Base.Int64.t
val set_int64_t_le : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val set_int64_t_be : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val unsafe_get_int64_t_le : t -> pos:Base.int -> Base.Int64.t
val unsafe_get_int64_t_be : t -> pos:Base.int -> Base.Int64.t
val unsafe_set_int64_t_le : t -> pos:Base.int -> Base.Int64.t -> Base.unit
val unsafe_set_int64_t_be : t -> pos:Base.int -> Base.Int64.t -> Base.unit
module Private = Bigstring_unix.Private
include Core_kernel.Hexdump.S with type t := t
module Hexdump = Bigstring_unix.Hexdump

Creation and string conversion

val create : ?max_mem_waiting_gc:Core_kernel__.Byte_units0.t -> Base.Int.t -> t

create length

  • parameter max_mem_waiting_gc

    default = 256 M in OCaml <= 3.12, 1 G otherwise. As the total allocation of calls to create approach max_mem_waiting_gc, the pressure in the garbage collector to be more agressive will increase.

  • returns

    a new bigstring having length. Content is undefined.

val sub_shared : ?pos:Base.Int.t -> ?len:Base.Int.t -> t -> t

sub_shared ?pos ?len bstr

  • returns

    the sub-bigstring in bstr that starts at position pos and has length len. The sub-bigstring shares the same memory region, i.e. modifying it will modify the original bigstring. Holding on to the sub-bigstring will also keep the (usually bigger) original one around.

  • parameter pos

    default = 0

  • parameter len

    default = Bigstring.length bstr - pos

Reading/writing bin-prot

These functions write the "size-prefixed" bin-prot format that is used by, e.g., async's Writer.write_bin_prot, Reader.read_bin_prot and Unpack_buffer.Unpack_one.create_bin_prot.

val write_bin_prot : t -> ?pos:Base.Int.t -> 'a Bin_prot.Type_class.writer -> 'a -> Base.Int.t

write_bin_prot t writer a writes a to t starting at pos, and returns the index in t immediately after the last byte written. It raises if pos < 0 or if a doesn't fit in t.

val read_bin_prot : t -> ?pos:Base.Int.t -> ?len:Base.Int.t -> 'a Bin_prot.Type_class.reader -> ('a * Base.Int.t) Core_kernel.Or_error.t

The read_bin_prot* functions read from the region of t starting at pos of length len. They return the index in t immediately after the last byte read. They raise if pos and len don't describe a region of t.

val read_bin_prot_verbose_errors : t -> ?pos:Base.Int.t -> ?len:Base.Int.t -> 'a Bin_prot.Type_class.reader -> [ `Invalid_data of Core_kernel.Error.t | `Not_enough_data | `Ok of 'a * Base.Int.t ]

Destruction

val unsafe_destroy : t -> Base.Unit.t

unsafe_destroy bstr destroys the bigstring by deallocating its associated data or, if memory-mapped, unmapping the corresponding file, and setting all dimensions to zero. This effectively frees the associated memory or address-space resources instantaneously. This feature helps working around a bug in the current OCaml runtime, which does not correctly estimate how aggressively to reclaim such resources.

This operation is safe unless you have passed the bigstring to another thread that is performing operations on it at the same time. Access to the bigstring after this operation will yield array bounds exceptions.

  • raises Failure

    if the bigstring has already been deallocated (or deemed "external", which is treated equivalently), or if it has proxies, i.e. other bigstrings referring to the same data.

val unsafe_destroy_and_resize : t -> len:Base.Int.t -> t

unsafe_destroy_and_resize bstr ~len reallocates the memory backing bstr and returns a new bigstring that starts at position 0 and has length len. If len is greater than length bstr then the newly allocated memory will not be initialized.

Similar to unsafe_destroy, this operation is safe unless you have passed the bigstring to another thread that is performing operations on it at the same time. Access to bstr after this operation will yield array bounds exceptions.

  • raises Failure

    if the bigstring has already been deallocated (or deemed "external", which is treated equivalently), if it is backed by a memory map, or if it has proxies, i.e. other bigstrings referring to the same data.

val get_tail_padded_fixed_string : padding:Base.Char.t -> t -> pos:Base.Int.t -> len:Base.Int.t -> Base.Unit.t -> Base.String.t

Similar to Binary_packing.unpack_tail_padded_fixed_string and .pack_tail_padded_fixed_string.

val set_tail_padded_fixed_string : padding:Base.Char.t -> t -> pos:Base.Int.t -> len:Base.Int.t -> Base.String.t -> Base.Unit.t
val get_head_padded_fixed_string : padding:Base.Char.t -> t -> pos:Base.Int.t -> len:Base.Int.t -> Base.Unit.t -> Base.String.t
val set_head_padded_fixed_string : padding:Base.Char.t -> t -> pos:Base.Int.t -> len:Base.Int.t -> Base.String.t -> Base.Unit.t
module Unstable = Bigstring_unix.Unstable
module Stable = Bigstring_unix.Stable
exception IOError of int * exn

Type of I/O errors.

In IOError (n, exn), n is the number of bytes successfully read/written before the error and exn is the exception that occurred (e.g., Unix_error, End_of_file)

Input functions

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

read ?min_len fd ?pos ?len bstr reads at least min_len (must be >= 0) and at most len (must be >= 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.

val really_read : Core.Unix.File_descr.t -> ?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.

val really_recv : Core.Unix.File_descr.t -> ?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.

val recvfrom_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> ?pos:int -> ?len:int -> t -> int * Core.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.

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

val pread_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> 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.

val input : ?min_len:int -> Core.In_channel.t -> ?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, which must be >= 0 and <= 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.

val really_input : Core.In_channel.t -> ?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.

Output functions

val really_write : Core.Unix.File_descr.t -> ?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.

val really_send_no_sigpipe : (Core.Unix.File_descr.t -> ?pos:int -> ?len:int -> t -> unit) Core.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.

really_send_no_sigpipe is not implemented on some platforms, in which case it returns an Error value indicating that it is unimplemented.

val send_nonblocking_no_sigpipe : (Core.Unix.File_descr.t -> ?pos:int -> ?len:int -> t -> Core.Unix.Syscall_result.Int.t) Core.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.

val sendto_nonblocking_no_sigpipe : (Core.Unix.File_descr.t -> ?pos:int -> ?len:int -> t -> Core.Unix.sockaddr -> Core.Unix.Syscall_result.Int.t) Core.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 bytes_written.

Raises Invalid_argument if the designated range is out of bounds.

val write : Core.Unix.File_descr.t -> ?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 Invalid_argument if the designated range is out of bounds. Raises Unix_error in the case of output errors.

val pwrite_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> 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 output errors.

val write_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> ?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 Invalid_argument if the designated range is out of bounds. Raises Unix_error in the case of output errors.

val writev : Core.Unix.File_descr.t -> ?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 Invalid_argument if count is out of range. Raises Unix_error in the case of output errors.

val writev_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> ?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 Invalid_argument if the designated range is out of bounds. Raises Unix_error in the case of output errors.

val recvmmsg_assume_fd_is_nonblocking : (Core.Unix.File_descr.t -> ?count:int -> ?srcs:Core.Unix.sockaddr array -> t Core.Unix.IOVec.t array -> lens:int array -> int) Core.Or_error.t
val unsafe_recvmmsg_assume_fd_is_nonblocking : (Core.Unix.File_descr.t -> t Core.Unix.IOVec.t array -> int -> Core.Unix.sockaddr array option -> int array -> int) Core.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, saves the source addresses for corresponding received messages there. If supplied, Array.length srcs must be >= count. Saves 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 "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 Invalid_argument if the designated range is out of bounds. Raises Unix_error in the case of output errors.

val sendmsg_nonblocking_no_sigpipe : (Core.Unix.File_descr.t -> ?count:int -> t Core.Unix.IOVec.t array -> int option) Core.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 Invalid_argument if count is out of range. Raises Unix_error in the case of output errors.

val output : ?min_len:int -> Core.Out_channel.t -> ?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, which must be >= 0), 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.

val really_output : Core.Out_channel.t -> ?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.

Unsafe functions

val unsafe_read_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> pos:int -> len:int -> t -> Core.Unix.Syscall_result.Int.t

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

val unsafe_write : Core.Unix.File_descr.t -> pos:int -> len:int -> t -> int

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

val unsafe_write_assume_fd_is_nonblocking : Core.Unix.File_descr.t -> pos:int -> len:int -> t -> int

unsafe_write_assume_fd_is_nonblocking fd ~pos ~len bstr is 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 -> Core.Unix.File_descr.t -> pos:int -> len:int -> t -> int

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

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

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

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

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

val unsafe_really_send_no_sigpipe : (Core.Unix.File_descr.t -> pos:int -> len:int -> t -> unit) Core.Or_error.t

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

val unsafe_send_nonblocking_no_sigpipe : (Core.Unix.File_descr.t -> pos:int -> len:int -> t -> Core.Unix.Syscall_result.Int.t) Core.Or_error.t

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

val unsafe_writev : Core.Unix.File_descr.t -> t Core.Unix.IOVec.t array -> int -> int

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

val unsafe_sendmsg_nonblocking_no_sigpipe : (Core.Unix.File_descr.t -> t Core.Unix.IOVec.t array -> int -> int option) Core.Or_error.t

unsafe_sendmsg_nonblocking_no_sigpipe fd iovecs count is 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 -> Core.In_channel.t -> pos:int -> len:int -> t -> int

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

val unsafe_output : min_len:int -> Core.Out_channel.t -> pos:int -> len:int -> t -> int

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

Memory mapping

val map_file : shared:bool -> Core.Unix.File_descr.t -> int -> t

map_file shared fd n memory-maps n characters of the data associated with descriptor fd to a bigstring. Iff shared is true, all changes to the bigstring will be reflected in the file.

Users must keep in mind that operations on the resulting bigstring may result in disk operations which block the runtime. This is true for pure OCaml operations (such as t.{1} <- 1), and for calls to blit. While some I/O operations may release the OCaml lock, users should not expect this to be done for all operations on a bigstring returned from map_file.

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