| 1 | /* test whether 64 bit fcntl locking really works on this system */
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| 2 |
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| 3 | #if defined(HAVE_UNISTD_H)
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| 4 | #include <unistd.h>
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| 5 | #endif
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| 6 |
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| 7 | #include <stdio.h>
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| 8 | #include <stdlib.h>
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| 9 | #include <sys/types.h>
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| 10 |
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| 11 | #ifdef HAVE_FCNTL_H
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| 12 | #include <fcntl.h>
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| 13 | #endif
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| 14 |
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| 15 | #ifdef HAVE_SYS_FCNTL_H
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| 16 | #include <sys/fcntl.h>
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| 17 | #endif
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| 18 |
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| 19 | #include <errno.h>
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| 20 |
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| 21 | static int sys_waitpid(pid_t pid,int *status,int options)
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| 22 | {
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| 23 | #ifdef HAVE_WAITPID
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| 24 | return waitpid(pid,status,options);
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| 25 | #else /* USE_WAITPID */
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| 26 | return wait4(pid, status, options, NULL);
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| 27 | #endif /* USE_WAITPID */
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| 28 | }
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| 29 |
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| 30 | #define DATA "conftest.fcntl64"
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| 31 |
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| 32 | /* lock a byte range in a open file */
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| 33 | int main(int argc, char *argv[])
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| 34 | {
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| 35 | struct flock64 lock;
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| 36 | int fd, ret, status=1;
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| 37 | pid_t pid;
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| 38 |
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| 39 | if (!(pid=fork())) {
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| 40 | sleep(2);
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| 41 | fd = open64(DATA, O_RDONLY);
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| 42 |
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| 43 | if (fd == -1) exit(1);
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| 44 |
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| 45 | lock.l_type = F_WRLCK;
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| 46 | lock.l_whence = SEEK_SET;
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| 47 | lock.l_start = 0;
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| 48 | lock.l_len = 4;
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| 49 | lock.l_pid = getpid();
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| 50 |
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| 51 | lock.l_type = F_WRLCK;
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| 52 |
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| 53 | /* check if a lock applies */
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| 54 | ret = fcntl(fd,F_GETLK64,&lock);
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| 55 |
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| 56 | if ((ret == -1) ||
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| 57 | (lock.l_type == F_UNLCK)) {
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| 58 | /* printf("No lock conflict\n"); */
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| 59 | exit(1);
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| 60 | } else {
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| 61 | /* printf("lock conflict\n"); */
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| 62 | exit(0);
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | fd = open64(DATA, O_RDWR|O_CREAT|O_TRUNC, 0600);
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| 67 |
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| 68 | lock.l_type = F_WRLCK;
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| 69 | lock.l_whence = SEEK_SET;
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| 70 | #if defined(COMPILER_SUPPORTS_LL)
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| 71 | lock.l_start = 0x100000000LL;
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| 72 | #else
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| 73 | lock.l_start = 0x100000000;
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| 74 | #endif
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| 75 | lock.l_len = 4;
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| 76 | lock.l_pid = getpid();
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| 77 |
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| 78 | /* set a 4 byte write lock */
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| 79 | fcntl(fd,F_SETLK64,&lock);
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| 80 |
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| 81 | sys_waitpid(pid, &status, 0);
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| 82 |
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| 83 | #if defined(WIFEXITED) && defined(WEXITSTATUS)
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| 84 | if(WIFEXITED(status)) {
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| 85 | status = WEXITSTATUS(status);
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| 86 | } else {
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| 87 | status = 1;
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| 88 | }
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| 89 | #else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
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| 90 | status = (status == 0) ? 0 : 1;
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| 91 | #endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */
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| 92 |
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| 93 | unlink(DATA);
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| 94 |
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| 95 | exit(status);
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| 96 | }
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