Name
sigwait — wait for a signal
Synopsis
#include <signal.h>
int
sigwait( |
const sigset_t *restrict set, |
int *restrict sig); |
![[Note]](../stylesheet/note.png) |
Note | ||||
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DESCRIPTION
The sigwait() function
suspends execution of the calling thread until one of the
signals specified in the signal set set becomes pending. The
function accepts the signal (removes it from the pending list
of signals), and returns the signal number in sig.
The operation of sigwait()
is the same as sigwaitinfo(2), except
that:
-
sigwait() returns only the signal number, rather than a siginfo_t structure describing the signal. -
The return values of the two functions are different.
RETURN VALUE
On success, sigwait()
returns 0. On error, it returns a positive error number
(listed in ERRORS).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
sigwait() |
Thread safety | MT-Safe |
NOTES
sigwait() is implemented
using sigtimedwait(2).
The glibc implementation of sigwait() silently ignores attempts to wait
for the two real-time signals that are used internally by the
NPTL threading implementation. See nptl(7) for details.
SEE ALSO
sigaction(2), signalfd(2), sigpending(2), sigsuspend(2), sigwaitinfo(2), sigsetops(3), signal(7)
COLOPHON
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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/.
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