Behaves likewait(2) on your system: it waits for a child process to terminate and returns the pid of the deceased process, or-1 if there are no child processes. The status is returned in$? and${^CHILD_ERROR_NATIVE}. Note that a return value of-1 could mean that child processes are being automatically reaped, as described inperlipc.
If you usewait in your handler for$SIG{CHLD}, it may accidentally wait for the child created byqx orsystem. Seeperlipc for details.
Equivalent towaitpid(-1, 0).
Portability issues:"wait" in perlport.
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