sctl.c

来自「基于网络编程的例子」· C语言 代码 · 共 33 行

/*
 * sctl.c - Manipulate and delete a semaphore
 */
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int semid; /* Semaphore identifier */

    if(argc != 2) {
        puts("USAGE: sctl <semaphore id>");
        exit(EXIT_FAILURE);
    }
    semid = atoi(argv[1]);

    /* Remove the semaphore */
    if((semctl(semid, 0, IPC_RMID)) < 0) {
        perror("semctl IPC_RMID");
        exit(EXIT_FAILURE);
    } else {
        puts("semaphore removed");
        system("ipcs -s");
    }

    exit(EXIT_SUCCESS);
}