| #define _GNU_SOURCE |
| |
| #include <config.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/ipc.h> |
| #include <sys/sem.h> |
| |
| int main(int argc, char **argv) |
| { |
| int semid; |
| struct sembuf sop; |
| #ifdef HAVE_SEMTIMEDOP |
| struct timespec ts; |
| #endif |
| |
| if ((semid = semget(IPC_PRIVATE, 1, 0600)) < 0) |
| { |
| perror("semget"); |
| exit(1); |
| } |
| |
| sop.sem_num = 0; |
| sop.sem_op = 1; |
| sop.sem_flg = 0; |
| |
| if (semop(semid, &sop, 1) < 0) |
| { |
| perror("semop"); |
| semctl(semid, 0, IPC_RMID); |
| exit(1); |
| } |
| |
| #ifdef HAVE_SEMTIMEDOP |
| sop.sem_num = 0; |
| sop.sem_op = 0; |
| sop.sem_flg = 0; |
| |
| ts.tv_sec = 0; |
| ts.tv_nsec = 1000000; |
| |
| if (semtimedop(semid, &sop, 1, &ts) < 0 && errno != EAGAIN) |
| { |
| perror("semtimedop"); |
| semctl(semid, 0, IPC_RMID); |
| exit(1); |
| } |
| #endif |
| |
| sop.sem_num = 0; |
| sop.sem_op = -1; |
| sop.sem_flg = 0; |
| |
| if (semop(semid, &sop, 1) < 0) |
| { |
| perror("semop"); |
| semctl(semid, 0, IPC_RMID); |
| exit(1); |
| } |
| |
| #ifdef HAVE_SEMTIMEDOP |
| sop.sem_num = 0; |
| sop.sem_op = 0; |
| sop.sem_flg = 0; |
| |
| ts.tv_sec = 0; |
| ts.tv_nsec = 1000; |
| |
| if (semtimedop(semid, &sop, 1, &ts) < 0) |
| { |
| perror("semtimedop"); |
| semctl(semid, 0, IPC_RMID); |
| exit(1); |
| } |
| #endif |
| |
| if (semctl(semid, 0, IPC_RMID) < 0) |
| { |
| perror("semctl(IPC_RMID)"); |
| exit(1); |
| } |
| |
| exit(0); |
| } |