sigpause

       #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  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)
       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  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).

SEE ALSO
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