uclibc-ng/libc/misc/lock/flock.c

/* Copyright (C) 1992, 1995, 1996, 1997 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.  */

/* This file implements the `flock' function in terms of the POSIX.1 `fcntl'
   locking mechanism.  In 4BSD, these are two incompatible locking mechanisms,
   perhaps with different semantics?  */

#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/file.h>

/* Apply or remove an advisory lock, according to OPERATION,
   on the file FD refers to.  */
int flock( int fd, int operation)
{
	struct flock lbuf;

	switch (operation & ~LOCK_NB) {
	case LOCK_SH:
		lbuf.l_type = F_RDLCK;
		break;
	case LOCK_EX:
		lbuf.l_type = F_WRLCK;
		break;
	case LOCK_UN:
		lbuf.l_type = F_UNLCK;
		break;
	default:
		errno = EINVAL;
		return -1;
	}

	lbuf.l_whence = SEEK_SET;
	lbuf.l_start = lbuf.l_len = 0L;	/* Lock the whole file.  */

	return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lbuf);
}