mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-27 23:34:52 +00:00
61 lines
1.9 KiB
Mathematica
61 lines
1.9 KiB
Mathematica
%-----------------------------------------------------------------------------%
|
|
% vim: ft=mercury ts=4 sw=4 et
|
|
%-----------------------------------------------------------------------------%
|
|
% Copyright (C) 1999, 2007 The University of Melbourne.
|
|
% Copyright (C) 2018-2019 The Mercury team.
|
|
% This file is distributed under the terms specified in COPYING.LIB.
|
|
%-----------------------------------------------------------------------------%
|
|
%
|
|
% Module: posix.read.
|
|
% Main author: conway@cs.mu.oz.au
|
|
%
|
|
%-----------------------------------------------------------------------------%
|
|
|
|
:- module posix.read.
|
|
:- interface.
|
|
|
|
:- import_module bitmap.
|
|
|
|
:- pred read(fd::in, int::in, posix.result(int)::out,
|
|
bitmap::bitmap_di, bitmap::bitmap_uo, io::di, io::uo) is det.
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
%-----------------------------------------------------------------------------%
|
|
|
|
:- implementation.
|
|
|
|
:- import_module int.
|
|
|
|
:- pragma foreign_decl("C", "
|
|
#include <unistd.h>
|
|
").
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
|
|
read(Fd, ToRead, Result, !Bitmap, !IO) :-
|
|
read0(Fd, ToRead, Read, !Bitmap, !IO),
|
|
( if Read < 0 then
|
|
errno(Err, !IO),
|
|
Result = error(Err)
|
|
else
|
|
Result = ok(Read)
|
|
).
|
|
|
|
:- pred read0(fd::in, int::in, int::out,
|
|
bitmap::bitmap_di, bitmap::bitmap_uo, io::di, io::uo) is det.
|
|
:- pragma foreign_proc("C",
|
|
read0(Fd::in, ToRead::in, Read::out, Bitmap0::bitmap_di, Bitmap::bitmap_uo,
|
|
_IO0::di, _IO::uo),
|
|
[promise_pure, will_not_call_mercury, thread_safe, tabled_for_io],
|
|
"
|
|
do {
|
|
Read = read(Fd, Bitmap0->elements, ToRead);
|
|
} while (Read == -1 && MR_is_eintr(errno));
|
|
|
|
Bitmap = Bitmap0;
|
|
").
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
:- end_module posix.read.
|
|
%-----------------------------------------------------------------------------%
|