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      1 #include <stdio.h>
      2 #include <unistd.h>
      3 #include <signal.h>
      4 #include <pthread.h>
      5 #include <assert.h>
      6 
      7 #include <sys/wait.h>
      8 
      9 void *
     10 slavethread(void *arg)
     11 {
     12     sigset_t sigmask;
     13 
     14     if (sigfillset(&sigmask))
     15     {
     16         fprintf(stderr, "Error line %u\n", __LINE__);
     17         _exit(255);
     18     }
     19 
     20     if (pthread_sigmask(SIG_UNBLOCK, &sigmask, 0))
     21     {
     22         fprintf(stderr, "Error line %u\n", __LINE__);
     23         _exit(255);
     24     }
     25 
     26     while (1)
     27         sleep(1);
     28 }
     29 
     30 void
     31 childprocess()
     32 {
     33     pthread_t slave;
     34 
     35     if (pthread_create(&slave, 0, &slavethread, 0))
     36     {
     37         fprintf(stderr, "Error line %u\n", __LINE__);
     38         _exit(255);
     39     }
     40 
     41     while (1)
     42         sleep(1);
     43 }
     44 
     45 int main(int argc, char **argv)
     46 {
     47     sigset_t sigmask;
     48 
     49     if (sigfillset(&sigmask))
     50     {
     51         fprintf(stderr, "Error line %u\n", __LINE__);
     52         return 255;
     53     }
     54 
     55     if (pthread_sigmask(SIG_BLOCK, &sigmask, 0))
     56     {
     57         fprintf(stderr, "Error line %u\n", __LINE__);
     58         return 255;
     59     }
     60 
     61     int childpid = fork();
     62 
     63     if (-1 == childpid)
     64     {
     65         fprintf(stderr, "Error line %u\n", __LINE__);
     66         return 255;
     67     }
     68 
     69     if ( ! childpid)
     70         childprocess();
     71 
     72     if (kill(childpid, SIGTERM))
     73     {
     74         fprintf(stderr, "Error line %u\n", __LINE__);
     75         return 255;
     76     }
     77 
     78     int status;
     79     if (childpid != waitpid(childpid, &status, 0))
     80     {
     81         fprintf(stderr, "Error line %u\n", __LINE__);
     82         return 255;
     83     }
     84 
     85     assert(WIFSIGNALED(status));
     86 
     87     fprintf(stderr, "Signal %d\n", WTERMSIG(status));
     88     assert(WTERMSIG(status) == SIGTERM);
     89 
     90     return 0;
     91 }
     92