| 1 | /* |
| 2 | ** Copyright 1998 - 1999 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | /* $Id */ |
| 7 | |
| 8 | #include "liblock.h" |
| 9 | #if USE_FCNTL |
| 10 | #include "lockfcntl.c" |
| 11 | #endif |
| 12 | #if USE_FLOCK |
| 13 | #include "lockflock.c" |
| 14 | #endif |
| 15 | #if USE_LOCKF |
| 16 | #include "locklockf.c" |
| 17 | #endif |
| 18 | #include <signal.h> |
| 19 | #include <stdlib.h> |
| 20 | |
| 21 | int main() |
| 22 | { |
| 23 | int fd[2]; |
| 24 | pid_t p; |
| 25 | int s; |
| 26 | int f; |
| 27 | |
| 28 | signal(SIGCHLD, SIG_DFL); |
| 29 | if (pipe(fd)) |
| 30 | { |
| 31 | perror("pipe"); |
| 32 | return (1); |
| 33 | } |
| 34 | |
| 35 | if ((p=fork()) == (pid_t)-1) |
| 36 | { |
| 37 | perror("fork"); |
| 38 | return (1); |
| 39 | } |
| 40 | |
| 41 | if (p == 0) |
| 42 | { |
| 43 | char c; |
| 44 | |
| 45 | close(fd[1]); |
| 46 | read(fd[0], &c, 1); |
| 47 | close(fd[0]); |
| 48 | |
| 49 | if ((f=open("conftest.lock", O_RDWR|O_CREAT, 0644)) < 0) |
| 50 | { |
| 51 | perror("open"); |
| 52 | exit(1); |
| 53 | } |
| 54 | alarm(5); |
| 55 | |
| 56 | if (ll_lockfd(f, ll_writelock, 0, 0)) |
| 57 | { |
| 58 | close(f); |
| 59 | exit(0); |
| 60 | } |
| 61 | close(f); |
| 62 | exit(1); |
| 63 | } |
| 64 | |
| 65 | if ((f=open("conftest.lock", O_RDWR|O_CREAT, 0644)) < 0) |
| 66 | { |
| 67 | perror("open"); |
| 68 | exit(1); |
| 69 | } |
| 70 | |
| 71 | if (ll_lockfd(f, ll_writelock, 0, 0)) |
| 72 | { |
| 73 | perror("lock"); |
| 74 | close(f); |
| 75 | exit(1); |
| 76 | } |
| 77 | close(fd[1]); |
| 78 | close(fd[0]); |
| 79 | while (wait(&s) != p) |
| 80 | ; |
| 81 | if (s == 0) |
| 82 | exit(0); |
| 83 | exit(1); |
| 84 | } |