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 / UNIX 95 */

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 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.

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.  UNIX 95 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 know only 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.  Otherwise, the System V version
       is used.

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 3.54 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                                              2010-09-12                                        SIGPAUSE(3)