82 lines
1.3 KiB
C
82 lines
1.3 KiB
C
/* See LICENSE file for copyright and license details. */
|
|
#include <sys/file.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
|
|
#include "util.h"
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
eprintf("usage: %s [-nosux] file cmd [arg ...]\n", argv0);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd, status, savederrno, flags = LOCK_EX, nonblk = 0, oflag = 0;
|
|
pid_t pid;
|
|
|
|
ARGBEGIN {
|
|
case 'n':
|
|
nonblk = LOCK_NB;
|
|
break;
|
|
case 'o':
|
|
oflag = 1;
|
|
break;
|
|
case 's':
|
|
flags = LOCK_SH;
|
|
break;
|
|
case 'u':
|
|
flags = LOCK_UN;
|
|
break;
|
|
case 'x':
|
|
flags = LOCK_EX;
|
|
break;
|
|
default:
|
|
usage();
|
|
} ARGEND;
|
|
|
|
if (argc < 2)
|
|
usage();
|
|
|
|
if ((fd = open(*argv, O_RDONLY | O_CREAT, 0644)) < 0)
|
|
eprintf("open %s:", *argv);
|
|
|
|
if (flock(fd, flags | nonblk)) {
|
|
if (nonblk && errno == EWOULDBLOCK)
|
|
return 1;
|
|
eprintf("flock:");
|
|
}
|
|
|
|
switch ((pid = fork())) {
|
|
case -1:
|
|
eprintf("fork:");
|
|
case 0:
|
|
if (oflag && close(fd) < 0)
|
|
eprintf("close:");
|
|
argv++;
|
|
execvp(*argv, argv);
|
|
savederrno = errno;
|
|
weprintf("execvp %s:", *argv);
|
|
_exit(126 + (savederrno == ENOENT));
|
|
default:
|
|
break;
|
|
}
|
|
waitpid(pid, &status, 0);
|
|
|
|
if (WIFSIGNALED(status))
|
|
return 128 + WTERMSIG(status);
|
|
if (WIFEXITED(status))
|
|
return WEXITSTATUS(status);
|
|
|
|
if (close(fd) < 0)
|
|
eprintf("close:");
|
|
|
|
return 0;
|
|
}
|