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sigblock(2freebsd)

June 2, 1993

freebsd-manpages

Manual pages for a GNU/kFreeBSD system

NAME

sigsetmask, sigblock - manipulate current signal mask

LIBRARY


.Lb libc

SYNOPSIS


.In signal.h int sigsetmask int mask int sigblock int mask int sigmask int signum

DESCRIPTION


.Bf -symbolic This interface is made obsolete by:
.Ef sigprocmask(2).
The sigsetmask function sets the current signal mask to the specified mask. Signals are blocked from delivery if the corresponding bit in mask is a 1. The sigblock function adds the signals in the specified mask to the current signal mask, rather than overwriting it as sigsetmask does. The macro sigmask is provided to construct the mask for a given signum.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.

RETURN VALUES

The sigblock and sigsetmask functions return the previous set of masked signals.

HISTORY

The sigsetmask and sigblock functions first appeared in BSD 4.2 and have been deprecated.
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