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Manual page for SIGPROCMASK(2P)

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)

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