pause - wait for signal

#include <unistd.h>
int pause(void);

pause() causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function.

pause() returns only when a signal was caught and the signal-catching function returned. In this case, pause() returns -1, and errno is set to EINTR.

kill(2), select(2), signal(2), sigsuspend(2)