unix - Sleep() returns early in xcode -

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If I run the code in xodod, then return to sleep when the child process goes out in just 1 second; But when I run this code in the terminal and it will sleep 10 seconds, why ?? 

  int main (int argc, const char * argv []) {pid_t pid; If ((pid = fork ()) == 0) {sleep (1); } And {sleep (10); Printf ("hello"); } Return 0; } 
 
 OK if you check the return code from sleep, you will see it return to  -1 is checking the error at  and  EINTR . 
 
 If you need to use, please work on this issue to see the answer I answered.

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