mandlock.c

Linux fs Linux fs Linux fs Linux fs Linux fs Linux fs Linux fsLinux fs Linux fsLinux fsLinux fsLinux

// <![CDATA[
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// Do not remove without removing all references to this in the below page (eg: everything containing "xyw" or "xyb")
// Original URL:   http://www.ibm.com/developerworks/cn/linux/l-cn-filelock/mandlock.c
// Retrieved from: 129.42.58.216:80
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#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/stat.h>

int lock_reg(int fd, int cmd, int type, off_t offset, int whence, off_t len)
{
        struct flock    lock;

        lock.l_type = type;     /* F_RDLCK, F_WRLCK, F_UNLCK */
        lock.l_start = offset;  /* byte offset, relative to l_whence */
        lock.l_whence = whence; /* SEEK_SET, SEEK_CUR, SEEK_END */
        lock.l_len = len;       /* #bytes (0 means to EOF) */

        return( fcntl(fd, cmd, &lock) );
}