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28 .\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93
35 .Nd manipulate current signal mask
43 .Fa "const sigset_t * restrict set"
44 .Fa "sigset_t * restrict oset"
49 system call examines and/or changes the current signal mask (those signals
50 that are blocked from delivery).
51 Signals are blocked if they are members of the current signal mask set.
55 is not null, the action of
57 depends on the value of the
60 The signal mask is changed as a function of the specified
63 The function is specified by
65 using one of the following values from
67 .Bl -tag -width SIG_UNBLOCK
69 The new mask is the union of the current mask and the specified
72 The new mask is the intersection of the current mask
73 and the complement of the specified
76 The current mask is replaced by the specified
82 is not null, it is set to
83 the previous value of the signal mask.
89 is insignificant and the mask remains unset
90 providing a way to examine the signal mask without modification.
99 In threaded applications,
100 .Xr pthread_sigmask 3
101 must be used instead of
108 system call will fail and the signal mask will be unchanged if one
109 of the following occurs:
115 has a value other than those listed here.
123 .Xr pthread_sigmask 3 ,
128 system call is expected to