linux kill系统调用

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <pid> <signal>\n", argv[0]);
        return 1;
    }

    pid_t pid = atoi(argv[1]);
    int sig = atoi(argv[2]);

    if (kill(pid, sig) == -1) {
        perror("kill");
        return 1;
    }

    printf("Signal %d sent to process %d\n", sig, pid);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
        return 1;
    }

    pid_t pid = atoi(argv[1]);

    if (kill(pid, SIGTERM) == -1) {
        perror("kill");
        return 1;
    }

    printf("SIGTERM sent to process %d. Waiting for termination...\n", pid);
    sleep(5); // 等待5秒

    if (kill(pid, 0) == 0) {
        printf("Process %d is still running.\n", pid);
    } else if (errno == ESRCH) {
        printf("Process %d has terminated.\n", pid);
    } else {
        perror("kill");
    }

    return 0;
}