4.4BSD/usr/share/man/cat2/sigblock.0

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SIGBLOCK(2)                 BSD Programmer's Manual                SIGBLOCK(2)

NNAAMMEE
     ssiiggbblloocckk - block signals

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssiiggnnaall..hh>>

     _i_n_t
     ssiiggbblloocckk(_i_n_t _m_a_s_k);

     _i_n_t
     ssiiggmmaasskk(_s_i_g_n_u_m);

DDEESSCCRRIIPPTTIIOONN
     TThhiiss iinntteerrffaaccee iiss mmaaddee oobbssoolleettee bbyy::  sigprocmask(2).

     SSiiggbblloocckk() adds the signals specified in _m_a_s_k to the set of signals cur-
     rently being blocked from delivery.  Signals are blocked if the corre-
     sponding bit in _m_a_s_k is a 1; the macro ssiiggmmaasskk() is provided to construct
     the mask for a given _s_i_g_n_u_m.

     It is not possible to block SIGKILL or SIGSTOP; this restriction is
     silently imposed by the system.

RREETTUURRNN VVAALLUUEESS
     The previous set of masked signals is returned.

SSEEEE AALLSSOO
     kill(2),  sigprocmask(2),  sigaction(2),  sigsetmask(2),  sigsetops(3)

HHIISSTTOORRYY
     The ssiiggbblloocckk function call appeared in 4.2BSD and has been deprecated.

4.2 Berkeley Distribution        June 2, 1993                                1