SYNTAX

       #include <wait.h>

       int wait_nohang(&wstat);
       int wait_stop(&wstat);
       int wait_stopnohang(&wstat);
       int wait_pid(&wstat,pid);

       int wait_exitcode(wstat);
       int wait_crashed(wstat);
       int wait_stopped(wstat);
       int wait_stopsig(wstat);

       int pid;
       int wstat;

DESCRIPTION

       wait_nohang  looks  for zombies (child processes that have exited).  If
       it sees a zombie, it eliminates the zombie, puts the zombie's exit sta-
       tus into wstat, and returns the zombie's process ID.  If there are sev-
       eral zombies, wait_nohang picks one.  If there are children but no zom-
       bies,  wait_nohang  returns  0.   If there are no children, wait_nohang
       returns -1, setting errno appropriately.

       wait_stopnohang is similar to wait_nohang, but it also looks for  chil-
       dren that have stopped.

       wait_stop  is  similar to wait_stopnohang, but if there are children it
       will pause waiting for one of them to stop or exit.

       wait_pid waits for child process pid to exit.  It eliminates any zombie
       that shows up in the meantime, discarding the exit status.

       wait_stop and wait_pid retry upon error_intr.

STATUS PARSING

       If the child stopped, wait_stopped is nonzero; wait_stopsig is the sig-
       nal that caused the child to stop.

       If the child exited by crashing, wait_stopped is zero; wait_crashed  is
       nonzero.

       If  the  child  exited  normally, wait_stopped is zero; wait_crashed is
       zero; and wait_exitcode is the child's exit code.

SEE ALSO

       wait(2), error(3)



                                                                       wait(3)