sigpause(3) Library Functions Manual sigpause(3)
NAME
sigpause - atomically release blocked signals and wait for interrupt
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <signal.h>
[[deprecated]] int sigpause(int sigmask); /* BSD (but see VERSIONS) */
[[deprecated]] int sigpause(int sig); /* POSIX.1 / SysV / 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 │
└────────────────────────────────────────────┴───────────────┴─────────┘
VERSIONS
On Linux, this routine is a system call only on the Sparc (sparc64) ar-
chitecture.
glibc uses the BSD version if the _BSD_SOURCE feature test macro is de-
fined 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 ob-
tain 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).
STANDARDS
POSIX.1-2008.
HISTORY
POSIX.1-2001. Obsoleted in POSIX.1-2008.
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 speci-
fied signal sig from the process's signal mask. The unfortunate situa-
tion 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).
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3),
sigvec(3), feature_test_macros(7)
Linux man-pages 6.9.1 2024-06-16 sigpause(3)
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