SIGPROCMASK
Section: Misc. Reference Manual Pages (2P)
Updated: August 1, 1992
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NAME
sigprocmask - (POSIX only) examine or change the signal mask of the calling process.
SYNOPSIS
#include <signal.h>
sigprocmask(int how, const sigset_t *set,
sigset_t *oset);
DESCRIPTION
The information in this specification applies
only to POSIX applications.
The
sigprocmask
function is used to examine or change (or both) the signal mask of
the calling process. If the value of the argument set is not
NULL, it points to a set of signals to be used to change the
currently blocked set.
The value of the argument how indicates the manner in which
the set is changed. The following values are accepted:
- SIG_BLOCK
-
The resulting set shall be the union of the current set and the
signal set pointed to by the argument set.
- SIG_UNBLOCK
-
The resulting set shall be the intersection of the current set and
the complement of the signal set pointed to by the argument set.
- SIG_SETMASK
-
The resulting set shall be the signal set ponted to by the argument set.
If the argument oset is not NULL, the previous mask is
stored in the space pointed to by oset. If the value of the
argument set is NULL, the value of the argument how
is not significant and the signal mask of the process is unchanged.
If there are any pending unblocked signals after the call to
sigprocmask
at least one of those signals shall be delivered before
sigprocmask
returns.
It is not possible to block the SIGKILL and SIGSTOP signals.
RETURN VALUE
Upon successful completion a value of zero is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
ERRORS
- [EINVAL]
-
The value of the how argument is not equal to one of the defined values.
SEE ALSO
sigaction(2P), sigpending(2P), sigsuspend(2P), sigsetops(3P)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- SEE ALSO
-
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