sigpause(3) — Linux manual page


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

NAME         top

       sigpause - atomically release blocked signals and wait for

SYNOPSIS         top

       #include <signal.h>

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

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

DESCRIPTION         top

       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         top

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

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface                             Attribute     Value   │
       │sigpause()                            │ Thread safety │ MT-Safe │

CONFORMING TO         top

       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         top

       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.

       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         top

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

COLOPHON         top

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       and the latest version of this page, can be found at

Linux                          2021-03-22                    SIGPAUSE(3)

Pages that refer to this page: sigset(3)sigvec(3)signal-safety(7)