sigblock(3) - NetBSD Manual Pages

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SIGBLOCK(3)             NetBSD Library Functions Manual            SIGBLOCK(3)


NAME
sigblock -- block signals
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h> int sigblock(int mask); int sigmask(signum);
DESCRIPTION
This interface is made obsolete by: sigprocmask(2). sigblock() adds the signals specified in mask to the set of signals cur- rently being blocked from delivery. Signals are blocked if the corre- sponding bit in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum. It is not possible to block SIGKILL or SIGSTOP; this restriction is silently imposed by the system.
RETURN VALUES
The previous set of masked signals is returned.
EXAMPLES
The following example using sigblock(): int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); Becomes: sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); Another use of sigblock() is to get the current set of masked signals without changing what is actually blocked. Instead of: int set; set = sigblock(0); Use the following: sigset_t set; sigprocmask(SIG_BLOCK, NULL, &set);
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsetmask(3), sigsetops(3)
HISTORY
The sigblock() function call appeared in 4.2BSD and has been deprecated. NetBSD 8.1 August 10, 2002 NetBSD 8.1
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