Linux man pages : pause (2)
PAUSE(2) Linux Programmer's Manual PAUSE(2)
pause - wait for signal
The pause library function causes the invoking process (or thread) to
sleep until a signal is received that either terminates it or causes it
to call a signal-catching function.
The pause function only returns when a signal was caught and the sig-
nal-catching function returned. In this case pause returns -1, and
errno is set to EINTR.
EINTR a signal was caught and the signal-catching function returned.
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
kill(2), select(2), signal(2)
Linux 1995-08-31 PAUSE(2)