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

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