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FreeBSD 11.0 - man page for pause (freebsd section 3)

PAUSE(3)						   BSD Library Functions Manual 						  PAUSE(3)

NAME
pause -- stop until signal
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h> int pause(void);
DESCRIPTION
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.
RETURN VALUES
Always returns -1.
ERRORS
The pause() function always returns: [EINTR] The call was interrupted.
SEE ALSO
kill(2), select(2), sigsuspend(2)
HISTORY
A pause() syscall appeared in Version 6 AT&T UNIX.
BSD
June 4, 1993 BSD