src/libstddjb/wait_pid_nohang.c


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/* ISC license. */

#include <sys/wait.h>
#include <skalibs/djbunix.h>

 /*
   wait_pid_nohang (defined here): reaps everything until it gets pid
   waitpid_nohang (macro): only tries to reap pid, doesn't touch others
 */

pid_t wait_pid_nohang (pid_t pid, int *wstat)
{
  int w = 0 ;
  pid_t r = 0 ;
  while (r != pid)
  {
    r = wait_nohang(&w) ;
    if (!r || (r == (pid_t)-1)) return r ;
  }
  *wstat = w ;
  return r ;
}