sigpause man page on Archlinux

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

       sigpause - atomically release blocked signals and wait for interrupt

       #include <signal.h>

       int sigpause(int sigmask);  /* BSD (but see NOTES) */

       int sigpause(int sig);	   /* System V / UNIX 95 */

       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.

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

   Multithreading (see pthreads(7))
       The sigpause() function is thread-safe.

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

       The classical BSD version of this function appeared in 4.2BSD.  It sets
       the process's signal mask to sigmask.  UNIX 95 standardized the	incom‐
       patible System V version of this function, which removes only the spec‐
       ified signal sig from the process's signal mask.	 The unfortunate situ‐
       ation  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)

       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  ver‐
       sion  is used (and _XOPEN_SOURCE must be defined to obtain the declara‐
       tion).  Since glibc 2.19, only the System V version is exposed by <sig‐
       nal.h>;	applications  that  formerly used the BSD sigpause() should be
       amended to use sigsuspend(2).

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

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2014-01-07			   SIGPAUSE(3)

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