glibc/sysdeps/generic/lockf.c
Ulrich Drepper 9c3b1ceba8 Update.
* string/bits/string2.h (strspn): Evaluate first argument if
	second is "".
	(strpbrk): Likewise.
	* sysdeps/i386/i486/bits/string.h: Likewise.
	* string/Makefile (tests): Add bug-strspn1 and bug-strpbrk1.
	* string/bug-strspn1.c: New file.
	* string/bug-strpbrk1.c: New file.
	Test cases by Joseph S. Myers <jsm28@cam.ac.uk>.

	* string/bits/string2.h (strncat): Terminate string correctly.
	* sysdeps/i386/i486/bits/string.h (strncat): Likewise.
	* string/Makefile (tests): Add bug-strncat1.
	* string/bug-strncat1.c: New file.
	Test case by Joseph S. Myers <jsm28@cam.ac.uk>.

2000-10-27  Ben Collins  <bcollins@debian.org>

	* sysdeps/generic/lockf.c (lockf): Set l_type to F_RDLCK before
	calling for F_GETLK.

2000-10-29  Ulrich Drepper  <drepper@redhat.com>
2000-10-30 04:08:58 +00:00

72 lines
2.0 KiB
C

/* Copyright (C) 1994, 1996, 1997, 1998, 2000 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
lockf (int fd, int cmd, off_t len)
{
struct flock fl;
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. */
fl.l_type = F_RDLCK;
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);
}