term% ls -F
term% cat index.txt
WAIT(2)                       System Calls Manual                      WAIT(2)

       wait - wait for a process to exit

       #include <u.h>
       #include <libc.h>

       int wait(Waitmsg *w)

       Wait  causes  a  process to wait for any child process (see fork(2)) to
       exit.  It returns the pid of a child that has exited  and  fills  in  w
       with  more  information  about the child.  W points to a Waitmsg, which
       has this structure:

              struct Waitmsg
                    char pid[12];         /* of loved one */
                    char time[3*12];      /* of loved one & descendants */
                    char msg[ERRLEN];
              } Waitmsg;

       Pid is the child's process id.  The time array contains  the  time  the
       child  and its descendants spent in user code, the time spent in system
       calls, and the child's elapsed real time, all in units of milliseconds.
       All integers in a Waitmsg are formatted as right-justified textual num‐
       bers in 11-byte fields followed by a blank.  Msg contains  the  message
       that  the  child  specified  in exits(2).  For a normal exit, msg[0] is
       zero, otherwise msg is prefixed by  the  process  name,  a  blank,  the
       process id, and a colon.

       If  there  are  no more children to wait for, wait returns immediately,
       with return value -1.


       fork(2), exits(2), the wait file in proc(3)

       Sets errstr.