sigsetmask(3) - NetBSD Manual Pages

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SIGSETMASK(3)           NetBSD Library Functions Manual          SIGSETMASK(3)


NAME
sigsetmask -- set current signal mask
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h> int sigsetmask(int mask); sigmask(signum);
DESCRIPTION
This interface is made obsolete by: sigprocmask(2). sigsetmask() sets the current signal mask. Signals are blocked from delivery if the corresponding bit in mask is a 1; 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 previous set of masked signals is returned.
EXAMPLES
The following example using sigsetmask(): int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); ... sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP))); Could be converted literally to: sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); ... sigdelset(&oset, SIGINT); sigdelset(&oset, SIGHUP); sigprocmask(SIG_SETMASK, &oset, NULL); Another, clearer, alternative is: sigset_t set; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, NULL); ... sigprocmask(SIG_UNBLOCK, &set, NULL); To completely clear the signal mask using sigsetmask() one can do: (void) sigsetmask(0); Which can be expressed via sigprocmask(2) as: sigset_t eset; sigemptyset(&eset); (void) sigprocmask(SIG_SETMASK, &eset, NULL);
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigsetops(3), sigvec(3)
HISTORY
The sigsetmask() function call appeared in 4.2BSD and has been depre- cated. NetBSD 9.99 August 10, 2002 NetBSD 9.99
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