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Editorial Team
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Asked: 2026-05-31T05:24:59+00:00

#include <signal.h> #include <stdio.h> void ints(int i ) { printf(ints \n); } int main(void)

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

void ints(int i )
{
   printf("ints \n");
}


int main(void)
{
    signal(SIGINT, ints);
   sleep(10);  
}

input Ctrl+C , the program will terminate immediately with output:

^ints

I was wondering why,in my opinion,the program should terminate after 10 seconds no matter how many times Ctrl+C is input.

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1 Answer

  1. Editorial Team

    sleep() is one of those functions that is never re-started when interrupted.

    interestingly, it also does not return a EINT as one would expect.

    It instead returns success with the time remaining to sleep.

    See:
    http://www.kernel.org/doc/man-pages/online/pages/man7/signal.7.html
    for details on other APIs that do not restart when interrupted

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