SIGPAUSE(3)                                         Linux Programmer's Manual                                        SIGPAUSE(3)



NAME
       sigpause - atomically release blocked signals and wait for interrupt

SYNOPSIS
       #include <signal.h>

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

       int sigpause(int sig);      /* System V / 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's signal mask (set of blocked sig-
       nals), 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.

CONFORMING TO
       The System V version of sigpause() is standardized in POSIX.1-2001.

NOTES
   History
       The classical BSD version of this function appeared in 4.2BSD.  It sets the process's signal  mask  to  sigmask.   Unix95
       standardized  the  incompatible  System  V version of this function, which removes only the specified signal sig from the
       process's 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 * argument (instead of an int).

   Linux Notes
       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 if the _BSD_SOURCE feature test macro is defined and none of _POSIX_SOURCE, _POSIX_C_SOURCE,
       _XOPEN_SOURCE, _GNU_SOURCE, or _SVID_SOURCE is defined.  The System V version is used if _XOPEN_SOURCE is defined.

SEE ALSO
       kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), feature_test_macros(7)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2005-12-01                                                SIGPAUSE(3)