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sigsuspend() - Unix, Linux System Call
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NAME
sigsuspend - wait for a signal
SYNOPSIS
#include <signal.h>
int sigsuspend(const sigset_t *mask); DESCRIPTION
sigsuspend() temporarily replaces the signal mask of the calling process with the
mask given by
mask and then suspends the process 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 processs signal mask.
RETURN VALUE
sigsuspend() always returns -1, normally with the error
EINTR. ERRORS
Tag | Description |
EFAULT |
mask points to memory which is not a valid part of the process address space.
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EINTR |
The call was interrupted by a signal.
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NOTES
Normally,
sigsuspend() is used in conjunction with
sigprocmask() in order to prevent delivery of a signal during the execution of a
critical code section.
The caller first blocks the signals with
sigprocmask(). 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() (in the
oldset argument).
See
sigsetops(3)
for details on manipulating signal sets.
CONFORMING TO
POSIX.1-2001.
SEE ALSO
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