问系统呼叫中断

EN

#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/select.h>
#include <unistd.h>

#define SIG SIGALRM

int work = 1;

void signal_action(int signal)
{
    fprintf(stderr, "%s caught\n", strsignal(signal));
}

void* thread_routine(void* arg)
{
    struct sigaction sa;
    sa.sa_handler = signal_action;

    if(sigaction(SIG, &sa, NULL) < 0)
    {
        fprintf(stderr, "sigaction failed with %d (%s)\n", errno, strerror(errno));
        return NULL;
    }

    fprintf(stderr, "Thread working\n");
    while(work)
    {
        int rc = select(0, NULL, NULL, NULL, NULL);
        if(rc < 0)
        {
            fprintf(stderr, "Select error: %d (%s)\n", errno, strerror(errno));
        }
        else
        {
            fprintf(stderr, "Select return %d\n", rc);
        }
    }
}

int main(int argc, char** argv)
{
    pthread_t handle;
    int rc = pthread_create(&handle, NULL, thread_routine, NULL);
    if(rc != 0)
    {
        fprintf(stderr, "pthread_create failed with %d (%s)\n", rc, strerror(rc));
        return 1;
    }

    sleep(1);

    work = 0;
    rc = pthread_kill(handle, SIG);
    if(rc != 0)
    {
        fprintf(stderr, "pthread_kill failed with %d (%s)\n", rc, strerror(rc));
        return 1;
    }

    rc = pthread_join(handle, NULL);
    if(rc != 0)
    {
        fprintf(stderr, "pthread_join failed with %d (%s)\n", rc, strerror(rc));
        return 1;
    }

    return 0;
}