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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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SIGSUSPEND(2) Linux Programmer's Manual SIGSUSPEND(2)
sigsuspend, rt_sigsuspend - wait for a signal
#include <signal.h>
int sigsuspend(const sigset_t *mask);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sigsuspend(): _POSIX_C_SOURCE
sigsuspend() temporarily replaces the signal mask of the calling
thread with the mask given by mask and then suspends the thread
until delivery of a signal whose action is to invoke a signal
handler or to terminate a process.
If the signal terminates the process, then sigsuspend() does not
return. If the signal is caught, then sigsuspend() returns after
the signal handler returns, and the signal mask is restored to
the state before the call to sigsuspend().
It is not possible to block SIGKILL or SIGSTOP; specifying these
signals in mask, has no effect on the thread's signal mask.
sigsuspend() always returns -1, with errno set to indicate the
error (normally, EINTR).
EFAULT mask points to memory which is not a valid part of the
process address space.
EINTR The call was interrupted by a signal; signal(7).
POSIX.1-2001, POSIX.1-2008.
Normally, sigsuspend() is used in conjunction with sigprocmask(2)
in order to prevent delivery of a signal during the execution of
a critical code section. The caller first blocks the signals
with sigprocmask(2). When the critical code has completed, the
caller then waits for the signals by calling sigsuspend() with
the signal mask that was returned by sigprocmask(2) (in the
oldset argument).
See sigsetops(3) for details on manipulating signal sets.
C library/kernel differences
The original Linux system call was named sigsuspend(). However,
with the addition of real-time signals in Linux 2.2, the fixed-
size, 32-bit sigset_t type supported by that system call was no
longer fit for purpose. Consequently, a new system call,
rt_sigsuspend(), was added to support an enlarged sigset_t type.
The new system call takes a second argument, size_t sigsetsize,
which specifies the size in bytes of the signal set in mask.
This argument is currently required to have the value
sizeof(sigset_t) (or the error EINVAL results). The glibc
sigsuspend() wrapper function hides these details from us,
transparently calling rt_sigsuspend() when the kernel provides
it.
kill(2), pause(2), sigaction(2), signal(2), sigprocmask(2),
sigwaitinfo(2), sigsetops(3), sigwait(3), signal(7)
This page is part of release 5.10 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 2019-03-06 SIGSUSPEND(2)
Pages that refer to this page: pause(2), sigaction(2), signal(2), sigpending(2), sigprocmask(2), syscalls(2), sigpause(3), sigset(3), sigsetops(3), sigwait(3), signal(7), signal-safety(7), system_data_types(7)
Copyright and license for this manual page
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