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SIGPROCMASK(2) UNIX Programmer's Manual SIGPROCMASK(2)
NNAAMMEE
ssiiggpprrooccmmaasskk - manipulate current signal mask
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssiiggnnaall..hh>>
_i_n_t
ssiiggpprrooccmmaasskk(_i_n_t _h_o_w, _c_o_n_s_t _s_i_g_s_e_t___t _*_s_e_t, _s_i_g_s_e_t___t _*_o_s_e_t)
ssiiggmmaasskk(_s_i_g_n_u_m)
DDEESSCCRRIIPPTTIIOONN
The ssiiggpprrooccmmaasskk() function examines and/or changes the current signal
mask (those signals that are blocked from delivery). Signals are blocked
if they are members of the current signal mask set.
If _s_e_t is not null, the action of ssiiggpprrooccmmaasskk() depends on the value of
the parameter _h_o_w. The signal mask is changed as a function of the speci
fied _s_e_t and the current mask. The function is specified by _h_o_w using
one of the following values from <_s_i_g_n_a_l_._h>:
SIG_BLOCK The new mask is the union of the current mask and the speci
fied _s_e_t.
SIG_UNBLOCK The new mask is the intersection of the current mask and the
complement of the specified _s_e_t.
SIG_SETMASK The current mask is replaced by the specified _s_e_t.
If _o_s_e_t is not null, it is set to the previous value of the signal mask.
When _s_e_t is null, the value of _h_o_w is insignificant and the mask remains
unset providing a way to examine the signal mask without modification.
The system quietly disallows SIGKILL or SIGSTOP to be blocked.
RREETTUURRNN VVAALLUUEESS
A 0 value indicated that the call succeeded. A 1 return value indicates
an error occurred and _e_r_r_n_o is set to indicated the reason.
EERRRROORRSS
The ssiiggpprrooccmmaasskk() call will fail and the signal mask will be unchanged if
one of the following occurs:
[EINVAL] _h_o_w has a value other than those listed here.
SSEEEE AALLSSOO
kill(2), sigaction(2), sigsetops(3), sigsuspend(2)
SSTTAANNDDAARRDDSS
The ssiiggpprrooccmmaasskk function call is expected to conform to IEEE
Std1003.11988 (``POSIX'').
BSD Experimental July 23, 1991 1