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1999-12-18  Ulrich Drepper  <drepper@cygnus.com>

	* include/unistd.h: Declare __libc_open64, __libc_lseek64,
	__libc_pread, __libc_pread64, __libc_pwrite, and __libc_pwrite64.
	* io/Versions: Export __libc_open64 and __libc_lseek64.
	* posix/Versions: Export __libc_pread, __libc_pread64, __libc_pwrite,
	and __libc_pwrite64.
	* sysdeps/generic/open64.c: Define __libc_* variant for cancelation
	wrapper.
	* sysdeps/generic/pread.c: Likewise.
	* sysdeps/generic/pread64.c: Likewise.
	* sysdeps/generic/pwrite.c: Likewise.
	* sysdeps/generic/pwrite64.c: Likewise.
	* sysdeps/posix/open64.c: Likewise.
	* sysdeps/posix/pread.c: Likewise.
	* sysdeps/posix/pread64.c: Likewise.
	* sysdeps/posix/pwrite.c: Likewise.
	* sysdeps/posix/pwrite64.c: Likewise.
	* sysdeps/unix/sysv/linux/llseek.c: Likewise.
	* sysdeps/unix/sysv/linux/pread.c: Likewise.
	* sysdeps/unix/sysv/linux/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/pwrite64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pread.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pread64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/pwrite64.c: Likewise.

	* sysdeps/posix/open64.c: Help gcc generating better code.

	* sysdeps/generic/libc-start.c (check_one_fd): Use __libc_open
	instead of __open.
This commit is contained in:
Ulrich Drepper
1999-12-19 05:29:07 +00:00
parent 43f94f913e
commit 778c59c850
28 changed files with 197 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
sysdeps/posix/pread64.c
View File

@@ -1,6 +1,6 @@
/* Read block from given position in file without changing file pointer.
POSIX version.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@@ -23,28 +23,28 @@
#include <unistd.h>
ssize_t
__pread64 (int fd, void *buf, size_t nbyte, off64_t offset)
__libc_pread64 (int fd, void *buf, size_t nbyte, off64_t offset)
{
/* Since we must not change the file pointer preserve the value so that
we can restore it later. */
int save_errno;
ssize_t result;
off64_t old_offset = __lseek64 (fd, 0, SEEK_CUR);
off64_t old_offset = __libc_lseek64 (fd, 0, SEEK_CUR);
if (old_offset == (off64_t) -1)
return -1;
/* Set to wanted position. */
if (__lseek64 (fd, offset, SEEK_SET) == (off64_t) -1)
if (__libc_lseek64 (fd, offset, SEEK_SET) == (off64_t) -1)
return -1;
/* Write out the data. */
result = __read (fd, buf, nbyte);
result = __libc_read (fd, buf, nbyte);
/* Now we have to restore the position. If this fails we have to
return this as an error. But if the writing also failed we
return this error. */
save_errno = errno;
if (__lseek64 (fd, old_offset, SEEK_SET) == (off64_t) -1)
if (__libc_lseek64 (fd, old_offset, SEEK_SET) == (off64_t) -1)
{
if (result == -1)
__set_errno (save_errno);
@@ -55,6 +55,7 @@ __pread64 (int fd, void *buf, size_t nbyte, off64_t offset)
return result;
}
#ifndef __pread64
weak_alias (__pread64, pread64)
#ifndef __libc_pread64
strong_alias (__libc_pread64, __pread64)
weak_alias (__libc_pread64, pread64)
#endif