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sigblock(2) [osx man page]

SIGBLOCK(2)						      BSD System Calls Manual						       SIGBLOCK(2)

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 currently 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. SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3) HISTORY
The sigblock() function call appeared in 4.2BSD and has been deprecated. BSD
June 2, 1993 BSD

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SIGBLOCK(3)						   BSD 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 currently 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. BSD
August 10, 2002 BSD
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