plan9 man page for sigpause

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 (but see NOTES) */

       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.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+---------+
       |Interface  | Attribute	   | Value   |
       +-----------+---------------+---------+
       |sigpause() | Thread safety | MT-Safe |
       +-----------+---------------+---------+
CONFORMING TO
       The System V version of sigpause() is standardized in POSIX.1-2001.  It is also specified in POSIX.1-2008, where it is marked obsolete.

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 unfortu-
       nate situation with two incompatible functions with the same name was solved by the sigsuspend(2) function, that takes a  sigset_t *  argu-
       ment (instead of an int).

   Linux notes
       On Linux, this routine is a system call only on the Sparc (sparc64) architecture.

       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, and feature test macros must be defined  as  follows	to
       obtain the declaration:

       *  Since glibc 2.26: _XOPEN_SOURCE >= 500

       *  Glibc 2.25 and earlier: _XOPEN_SOURCE

       Since  glibc 2.19, only the System V version is exposed by <signal.h>; applications that formerly used the BSD sigpause() should be amended
       to use sigsuspend(2).

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 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							       SIGPAUSE(3)