1#define _GNU_SOURCE
2
3#include <config.h>
4#include <errno.h>
5#include <stdio.h>
6#include <stdlib.h>
7#include <sys/ipc.h>
8#include <sys/sem.h>
9#include <time.h>
10#include <unistd.h>
11int main(int argc, char **argv)
12{
13   int semid;
14   struct sembuf sop;
15#ifdef HAVE_SEMTIMEDOP
16   struct timespec ts;
17#endif
18
19   if ((semid = semget(IPC_PRIVATE, 1, 0600)) < 0)
20   {
21      perror("semget");
22      exit(1);
23   }
24
25   sop.sem_num = 0;
26   sop.sem_op = 1;
27   sop.sem_flg = 0;
28
29   if (semop(semid, &sop, 1) < 0)
30   {
31      perror("semop");
32      semctl(semid, 0, IPC_RMID);
33      exit(1);
34   }
35
36   if (semctl(semid, 0, GETVAL) != 1)
37   {
38      perror("semctl GETVAL");
39      semctl(semid, 0, IPC_RMID);
40      exit(1);
41   }
42
43   if (semctl(semid, 0, GETPID) != getpid())
44   {
45      perror("semctl GETPID");
46      semctl(semid, 0, IPC_RMID);
47      exit(1);
48   }
49
50   /* The next call to semtimedop causes the program to hang on
51      ppc32-linux (Yellow Dog 4.0).  I don't know why.  Hence the
52      extended ifdef. */
53#if defined(HAVE_SEMTIMEDOP) && !defined(__powerpc__)
54   sop.sem_num = 0;
55   sop.sem_op = 0;
56   sop.sem_flg = 0;
57
58   ts.tv_sec = 0;
59   ts.tv_nsec = 1000000;
60
61   if (semtimedop(semid, &sop, 1, &ts) < 0 && errno != EAGAIN)
62   {
63      perror("semtimedop");
64      semctl(semid, 0, IPC_RMID);
65      exit(1);
66   }
67#endif
68
69   sop.sem_num = 0;
70   sop.sem_op = -1;
71   sop.sem_flg = 0;
72
73   if (semop(semid, &sop, 1) < 0)
74   {
75      perror("semop");
76      semctl(semid, 0, IPC_RMID);
77      exit(1);
78   }
79
80#ifdef HAVE_SEMTIMEDOP
81   sop.sem_num = 0;
82   sop.sem_op = 0;
83   sop.sem_flg = 0;
84
85   ts.tv_sec = 0;
86   ts.tv_nsec = 1000;
87
88   if (semtimedop(semid, &sop, 1, &ts) < 0)
89   {
90      perror("semtimedop");
91      semctl(semid, 0, IPC_RMID);
92      exit(1);
93   }
94#endif
95
96   if (semctl(semid, 0, IPC_RMID) < 0)
97   {
98      perror("semctl(IPC_RMID)");
99      exit(1);
100   }
101
102   exit(0);
103}
104