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32 .\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93
40 .Nd manipulate current signal mask
48 .Fa "const sigset_t * restrict set"
49 .Fa "sigset_t * restrict oset"
54 system call examines and/or changes the current signal mask (those signals
55 that are blocked from delivery).
56 Signals are blocked if they are members of the current signal mask set.
60 is not null, the action of
62 depends on the value of the
65 The signal mask is changed as a function of the specified
68 The function is specified by
70 using one of the following values from
72 .Bl -tag -width SIG_UNBLOCK
74 The new mask is the union of the current mask and the specified
77 The new mask is the intersection of the current mask
78 and the complement of the specified
81 The current mask is replaced by the specified
87 is not null, it is set to
88 the previous value of the signal mask.
94 is insignificant and the mask remains unset
95 providing a way to examine the signal mask without modification.
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.
127 system call is expected to