10-03-2010
wait() function...
when wait() is called by process it blocks calling process until child is done. What happens if calling process have multiple children.
What does wait(NULL) function do. Waits until all children are done?
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wait(3) Library Functions Manual wait(3)
NAME
wait - check child process status
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
status into wstat, and returns the zombie's process ID. If there are several zombies, wait_nohang picks one. If there are children but no
zombies, 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 children 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 signal 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)