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  1. #include <errno.h>
  2. #include <signal.h>
  3. #include <stdio.h>
  4. #include <string.h>
  5. #include <sys/types.h>
  6. #include <unistd.h>
  7.  
  8. int main() {
  9.     int rc; 
  10.     int fork_pid = fork();
  11.     if (fork_pid == 0) {
  12.         for(;;);
  13.     }   
  14.     rc = setpgid(fork_pid, getpid());
  15.     printf("setpgid(%d, %d) = %d %s\n", fork_pid, getpid(), rc, strerror(errno));
  16.  
  17.     rc = kill(-fork_pid, 9); 
  18.     printf("kill(%d, %d) = %d %s\n", -fork_pid, 9, rc, strerror(errno));
  19.  
  20.     rc = kill(fork_pid, 9); 
  21.     printf("kill(%d, %d) = %d %s\n", fork_pid, 9, rc, strerror(errno));
  22. }
  23.  
Success #stdin #stdout 0s 2160KB
comments (?)
stdin
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Standard input is empty
stdout
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setpgid(1096, 1087) = 0 Success
kill(-1096, 9) = -1 No such process
kill(1096, 9) = 0 No such process
https://ideone.com/fnz3oK
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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