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

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

NNAAMMEE
     ssiiggsseettmmaasskk - set current signal mask

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

     _i_n_t
     ssiiggsseettmmaasskk(_i_n_t _m_a_s_k);

     ssiiggmmaasskk(_s_i_g_n_u_m);

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

     SSiiggsseettmmaasskk() sets the current signal mask Signals are blocked from deliv-
     ery if the corresponding bit in _m_a_s_k is a 1; the macro ssiiggmmaasskk() is pro-
     vided to construct the mask for a given _s_i_g_n_u_m.

     The system quietly disallows SIGKILL or SIGSTOP to be blocked.

RREETTUURRNN VVAALLUUEESS
     The previous set of masked signals is returned.

SSEEEE AALLSSOO
     sigprocmask(2),  kill(2),  sigaction(2),  sigsuspend(2),  sigvec(2),
     sigblock(2),  sigsetops(3)

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

4.2 Berkeley Distribution        June 2, 1993                                1