CODEWITHSUNDEEP
cunixprocesssignals
jctank
jctank

Reputation: 41

SIGCHLD signal does not issued when child resume

Here is my signal handler:

pid_t pid;
int status;
while (pid = waitpid(-1, &status, WNOHANG|WUNTRACED|WCONTINUED))
{
     printf("resume? %d\n", WIFCONTINUED(status));
}

It always prints out 0 even if I send a SIGCONT to a child process. If I send a SIGCONT to a group of processes using killpg, some processes are indicated to be resumed but some are not. Could somebody tell me why this happened?

Upvotes: 1

Views: 437

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409482

The SIGCHLD signal is only if a child has stopped or terminated, not when execution resumes.

Upvotes: 1

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