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26.8 BSD Process Wait Function

The GNU C Library also provides the wait3 function for compatibility with BSD. This function is declared in sys/wait.h. It is the predecessor to wait4, which is more flexible. wait3 is now obsolete.

— Function: pid_t wait3 (int *status-ptr, int options, struct rusage *usage)

Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts.

If usage is a null pointer, wait3 is equivalent to waitpid (-1, status-ptr, options).

If usage is not null, wait3 stores usage figures for the child process in *rusage (but only if the child has terminated, not if it has stopped). See Resource Usage.