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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <endian.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include "kernel-features.h"
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#if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
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extern ssize_t __syscall_pread (int fd, void *buf, size_t count,
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off_t offset_hi, off_t offset_lo);
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# if __ASSUME_PREAD_SYSCALL == 0
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static ssize_t __emulate_pread64 (int fd, void *buf, size_t count,
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off64_t offset) internal_function;
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# endif
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ssize_t
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__libc_pread64 (fd, buf, count, offset)
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int fd;
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void *buf;
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size_t count;
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off64_t offset;
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{
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ssize_t result;
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/* First try the syscall. */
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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result = INLINE_SYSCALL (pread, 5, fd, buf, count,
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(off_t) (offset & 0xffffffff),
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(off_t) (offset >> 32));
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# elif __BYTE_ORDER == __BIG_ENDIAN
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result = INLINE_SYSCALL (pread, 5, fd, buf, count,
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(off_t) (offset >> 32),
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(off_t) (offset & 0xffffffff));
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# endif
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# if __ASSUME_PREAD_SYSCALL == 0
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if (result == -1 && errno == ENOSYS)
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/* No system call available. Use the emulation. */
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result = __emulate_pread64 (fd, buf, count, offset);
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# endif
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return result;
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}
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weak_alias (__libc_pread64, __pread64)
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weak_alias (__libc_pread64, pread64)
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# define __libc_pread64(fd, buf, count, offset) \
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static internal_function __emulate_pread64 (fd, buf, count, offset)
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#endif
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# if __ASSUME_PREAD_SYSCALL == 0
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# include <sysdeps/posix/pread64.c>
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#endif
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