sigpause — atomically release blocked signals and wait for interrupt
#include <signal.h>
/*BSD( |
but see NOTES) */ int sigpause(int sigmask); |
/* System V / UNIX 95 */
int
sigpause( |
int sig); |
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.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
sigpause() .\" FIXME: the following
marking is different from which in glibc manual, .\"
marking in glibc manual is more detailed. .\"
sigpause: MT-Unsafe race:sigprocmask/!bsd!linux .\"
glibc manual says /!linux!bsd indicate the preceding
marker only applies .\" when the underlying kernel is
neither Linux nor a BSD kernel. .\" So, it is safety
in Linux kernel. |
Thread safety | MT-Safe |
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.
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).
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 _XOPEN_SOURCE must be defined to obtain
the declaration). 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).
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), feature_test_macros(7)
This page is part of release 4.07 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/.
|
Copyright (C) 2004 Andries Brouwer (aebcwi.nl) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |