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man: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  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  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 4.16 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)

/data/webs/external/dokuwiki/data/pages/man/sigpause.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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