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BSD, Linux, Mac OS X, and other Unix-like operating systems did not inherit aspects of the original Unix design.
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sigblock(2) [freebsd man page]

SIGSETMASK(2)						      BSD System Calls Manual						     SIGSETMASK(2)

NAME
sigsetmask, sigblock -- manipulate current signal mask LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> int sigsetmask(int mask); int sigblock(int mask); int sigmask(int signum); DESCRIPTION
This interface is made obsolete by: 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. SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3) HISTORY
The sigsetmask() and sigblock() functions first appeared in 4.2BSD and have been deprecated. BSD
June 2, 1993 BSD

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SIGSETMASK(2)						      BSD System Calls Manual						     SIGSETMASK(2)

NAME
sigsetmask, sigblock -- manipulate current signal mask LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> int sigsetmask(int mask); int sigblock(int mask); int sigmask(int signum); DESCRIPTION
This interface is made obsolete by: 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. SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3) HISTORY
The sigsetmask() and sigblock() functions first appeared in 4.2BSD and have been deprecated. BSD
June 2, 1993 BSD

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