Cleaning Up Children Asynchronously

Listing 3.7 (sigchld.c) Cleaning Up Children by Handling SIGCHLD
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
sig_atomic_t child_exit_status;
void clean_up_child_process (int signal_number)
{
/* Clean up the child process. */
int status;
wait (&status);
/* Store its exit status in a global variable. */
child_exit_status = status;
}
int main ()
{
/* Handle SIGCHLD by calling clean_up_child_process. */
struct sigaction sigchld_action;
memset (&sigchld_action, 0, sizeof (sigchld_action));
sigchld_action.sa_handler = &clean_up_child_process;
sigaction (SIGCHLD, &sigchld_action, NULL);
/* Now do things, including forking a child process. */
/* ... */
return 0;
}