minix3/lib/libc/sys/flock.c

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2020-02-21 00:59:27 +05:30
/* Library routines
*
* Porting to Minix 2.0.0
* Author: Giovanni Falzoni <gfalzoni@pointest.com>
*/
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
/*
* Name: int flock(int fd, int mode);
* Function: Implements the flock function in Minix.
*/
int flock(int fd, int mode)
{
struct flock lck;
register int retcode;
memset((void *) &lck, 0, sizeof(struct flock));
lck.l_type = mode & ~LOCK_NB;
lck.l_pid = getpid();
if ((retcode = fcntl(fd, mode & LOCK_NB ? F_SETLK : F_SETLKW, &lck)) < 0 && errno == EAGAIN)
errno = EWOULDBLOCK;
return retcode;
}
/** flock.c **/