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1999-02-18  Ulrich Drepper  <drepper@cygnus.com>

	* io/Makefile (routines): Add lock64.
	* io/Versions: Add lockf64 for GLIBC_2.1.1.
	* sysdeps/generic/lockf64.c: New file.
This commit is contained in:
Ulrich Drepper 1999-02-18 09:10:37 +00:00
parent 5fdc5ad725
commit d629bceca4
4 changed files with 87 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
1999-02-18 Ulrich Drepper <drepper@cygnus.com>
* io/Makefile (routines): Add lock64.
* io/Versions: Add lockf64 for GLIBC_2.1.1.
* sysdeps/generic/lockf64.c: New file.
1999-02-16 Ulrich Drepper <drepper@cygnus.com>
* string/bits/string2.h: Only use strncmp optimization if count

4
io/Makefile
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@ -1,4 +1,4 @@
# Copyright (C) 1992, 93, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
# Copyright (C) 1992, 93, 94, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
@ -35,7 +35,7 @@ routines := \
statvfs fstatvfs statvfs64 fstatvfs64 \
umask chmod fchmod mkdir \
open open64 close read write lseek lseek64 access euidaccess \
fcntl flock lockf \
fcntl flock lockf lockf64 \
dup dup2 pipe \
creat creat64 \
chdir fchdir \

4
io/Versions
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@ -80,4 +80,8 @@ libc {
# s*
statfs64; statvfs; statvfs64;
}
GLIBC_2.1.1 {
# l*
lockf64;
}
}

75
sysdeps/generic/lockf64.c Normal file
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@ -0,0 +1,75 @@
/* Copyright (C) 1994, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/* lockf is a simplified interface to fcntl's locking facilities. */
int
lockf64 (int fd, int cmd, off64_t len64)
{
struct flock fl;
off_t len = (off_t) len64;
if (len64 != (off64_t) len)
/* We can't represent the length. */
return EOVERFLOW;
memset ((char *) &fl, '\0', sizeof (fl));
/* lockf is always relative to the current file position. */
fl.l_whence = SEEK_CUR;
fl.l_start = 0;
fl.l_len = len;
switch (cmd)
{
case F_TEST:
/* Test the lock: return 0 if FD is unlocked or locked by this process;
return -1, set errno to EACCES, if another process holds the lock. */
if (__fcntl (fd, F_GETLK, &fl) < 0)
return -1;
if (fl.l_type == F_UNLCK || fl.l_pid == __getpid ())
return 0;
__set_errno (EACCES);
return -1;
case F_ULOCK:
fl.l_type = F_UNLCK;
cmd = F_SETLK;
break;
case F_LOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLKW;
break;
case F_TLOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLK;
break;
default:
__set_errno (EINVAL);
return -1;
}
return __fcntl (fd, cmd, &fl);
}