sigpause

SIGPAUSE(2)		  Linux Programmer’s Manual		  SIGPAUSE(2)



NAME
       sigpause - atomically release blocked signals and wait for interrupt

SYNOPSIS
       #include <signal.h>

       int sigpause(int sigmask);  /* BSD */

       int sigpause(int sig);	   /* Unix95 */

DESCRIPTION
       Don’t use this function. Use sigsuspend(2) instead.

       The function sigpause is designed to wait for some signal.  It changes
       the process’ signal mask (set of blocked signals), and then waits  for
       a  signal  to  arrive.	Upon arrival of a signal, the original signal
       mask is restored.

RETURN VALUE
       If sigpause returns, it was interrupted by a  signal  and  the  return
       value is -1 with errno set to EINTR.

HISTORY
       The  classical  BSD  version  of this function appeared in 4.2BSD.  It
       sets the process’ signal mask to sigmask.  When the number of  signals
       was  increased above 32, this version was replaced by the incompatible
       Unix95 one, which removes only the specified signal sig from the	 pro-
       cess’  signal  mask.   The unfortunate situation with two incompatible
       functions with the same name was solved by the sigsuspend(2) function,
       that takes a sigset_t * parameter (instead of an int).

       On  Linux,  this	 routine is a system call only on the Sparc (sparc64)
       architecture. Libc4 and libc5 only know about the BSD version.	Glibc
       uses the BSD version unless _XOPEN_SOURCE is defined.

SEE ALSO
       kill(2),	 sigaction(2),	sigblock(2),  sigprocmask(2),  sigsuspend(2),
       sigvec(2)



Linux 2.6			  2004-05-10			  SIGPAUSE(2)