| /* 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; |
| } |
| if (waitpid(pid, &status, 0) < 0) |
| eprintf("waitpid:"); |
| |
| if (close(fd) < 0) |
| eprintf("close:"); |
| |
| if (WIFSIGNALED(status)) |
| return 128 + WTERMSIG(status); |
| if (WIFEXITED(status)) |
| return WEXITSTATUS(status); |
| |
| return 0; |
| } |