Linux C：接收到信号后，是否可以知道发送者的PID

Linux C 信号处理：获取发送者PID的方法

c
#include 
#include 
#include 
void signalHandler(int signo, siginfo_t *info, void *context) {
    // 获取发送者的PID
    pid_t senderPID = info->si_pid;
    printf("Received signal %d from process with PID %d%
", signo, senderPID);
}
int main() {
    struct sigaction sa;
    sa.sa_sigaction = signalHandler;
    sa.sa_flags = SA_SIGINFO;
    // 注册信号处理函数
    if (sigaction(SIGUSR1, &sa, NULL) == -1) {
        perror("Error registering signal handler");
        return 1;
    }
    printf("Waiting for signals...%
");
    // 进程将等待信号的到来
    while (1) {
        sleep(1);
    }
    return 0;
}

c
#include 
#include 
#include 
// 全局变量存储发送者的PID
volatile pid_t senderPID = 0;
void signalHandler(int signo) {
    // 获取发送者的PID
    senderPID = getppid();
    printf("Received signal %d from process with PID %d%
", signo, senderPID);
}
int main() {
    signal(SIGUSR1, signalHandler);
    printf("Waiting for signals...%
");
    // 进程将等待信号的到来
    while (1) {
        // 检查是否有发送者的PID
        if (senderPID != 0) {
            printf("Sender's PID: %d%
", senderPID);
            senderPID = 0; // 重置
        }
        sleep(1);
    }
    return 0;
}