21e62b99 |
1 | #include <stdio.h> |
2 | #include <unistd.h> |
3 | #include <fcntl.h> |
4 | #include <sys/file.h> |
5 | |
6 | int main(int argc, unsigned char **argv) |
7 | { |
8 | int c; |
9 | int fd, locktype; |
10 | pid_t pid; |
11 | int status; |
12 | |
13 | locktype = LOCK_EX; |
14 | while((c = getopt(argc, argv, "se")) > 0) |
15 | { |
16 | switch(c) |
17 | { |
18 | case 's': |
19 | locktype = LOCK_SH; |
20 | break; |
21 | case 'e': |
22 | locktype = LOCK_EX; |
23 | break; |
24 | default: |
25 | return(1); |
26 | } |
27 | } |
28 | if(argc - optind < 2) |
29 | { |
30 | fprintf(stderr, "Wrong number of arguments\n"); |
31 | return(1); |
32 | } |
33 | if((fd = open(argv[optind], O_RDWR | O_CREAT, 0600)) < 0) |
34 | { |
35 | perror(argv[optind]); |
36 | return(1); |
37 | } |
38 | optind++; |
39 | flock(fd, locktype); |
40 | if((pid = fork()) < 0) |
41 | { |
42 | perror("fork"); |
43 | return(1); |
44 | } else if(!pid) { |
45 | execvp(argv[optind], argv + optind); |
46 | perror(argv[optind]); |
47 | exit(127); |
48 | } |
49 | while(wait(&status) != pid); |
50 | flock(fd, LOCK_UN); |
51 | return(status); |
52 | } |