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PAUSE(3) Library Functions Manual PAUSE(3)

pause
stop until signal

#include <unistd.h>

int
pause(void);

Pause is made obsolete by sigsuspend(2).

The pause() function forces a process to pause until a signal is received from either the kill(2) function or an interval timer (see setitimer(2)).

Upon termination of a signal handler started during a pause(), the pause() call will return.

Always returns -1.

The pause() function may set the global variable errno to the following error:
[]
The call was interrupted.

kill(2), select(2), setitimer(2), sigsuspend(2)

A pause() system call first appeared in the Programmer's Workbench (PWB/UNIX) and was then ported to Version 7 AT&T UNIX. It was reimplemented as a wrapper around the sigpause() and sigblock() system calls in 4.2BSD, and around the sigsuspend(2) and sigprocmask(2) system calls in 4.3BSD-Reno.
September 23, 2015 OpenBSD-current