forked from rcore-os/zCore
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE 700
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/sem.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdio.h>
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static const char path[] = ".";
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static const int id = 's';
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#define T(f) assert((f) != -1)
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static void inc()
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{
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time_t t;
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key_t k;
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int semid, semval, sempid, semncnt, semzcnt;
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struct semid_ds semid_ds;
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union semun {
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int val;
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struct semid_ds *buf;
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unsigned short *array;
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} arg;
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struct sembuf sops;
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T(t = time(0));
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T(k = ftok(path, id));
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/* make sure we get a clean semaphore id */
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T(semid = semget(k, 1, IPC_CREAT | 0666));
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T(semctl(semid, 0, IPC_RMID));
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T(semid = semget(k, 1, IPC_CREAT | IPC_EXCL | 0666));
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/* check IPC_EXCL */
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errno = 0;
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if (semget(k, 1, IPC_CREAT | IPC_EXCL | 0666) != -1 || errno != EEXIST)
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printf("semget(IPC_CREAT|IPC_EXCL) should have failed with EEXIST, got %s\n", strerror(errno));
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/* check if msgget initilaized the msqid_ds structure correctly */
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arg.buf = &semid_ds;
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T(semctl(semid, 0, IPC_STAT, arg));
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if (semid_ds.sem_ctime < t)
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printf("semid_ds.sem_ctime >= t failed: got %lld, want >= %lld\n", (long long)semid_ds.sem_ctime, (long long)t);
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if (semid_ds.sem_ctime > t + 5)
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printf("semid_ds.sem_ctime <= t+5 failed: got %lld, want <= %lld\n", (long long)semid_ds.sem_ctime, (long long)t + 5);
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/* test sem_op > 0 */
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sops.sem_num = 0;
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sops.sem_op = 1;
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sops.sem_flg = 0;
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T(semval = semctl(semid, 0, GETVAL));
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assert(semval == 0);
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T(semop(semid, &sops, 1));
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T(semval = semctl(semid, 0, GETVAL));
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assert(semval == 1);
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T(sempid = semctl(semid, 0, GETPID));
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assert(sempid == getpid());
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T(semncnt = semctl(semid, 0, GETNCNT));
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assert(semncnt == 0);
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T(semzcnt = semctl(semid, 0, GETZCNT));
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assert(semzcnt == 0);
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}
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int main(void)
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{
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int p;
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int status;
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inc();
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int pid = vfork();
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if (pid < 0)
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printf("error in fork!\n");
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else if (pid == 0)
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{
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execl("/bin/testsem2", "/bin/testsem2", NULL);
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exit(0);
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}
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return 0;
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}
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