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28 .\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93
43 .Nd manipulate signal sets
49 .Fn sigemptyset "sigset_t *set"
51 .Fn sigfillset "sigset_t *set"
53 .Fn sigaddset "sigset_t *set" "int signo"
55 .Fn sigandset "sigset_t *set" "const sigset_t *left" "const sigset_t *right"
57 .Fn sigdelset "sigset_t *set" "int signo"
59 .Fn sigisemptyset "const sigset_t *set"
61 .Fn sigismember "const sigset_t *set" "int signo"
63 .Fn sigorset "sigset_t *set" "const sigset_t *left" "const sigset_t *right"
65 These functions manipulate signal sets stored in a
71 must be called for every object of type
73 before any other use of the object.
77 function initializes a signal set to be empty.
81 function initializes a signal set to contain all signals.
85 function adds the specified signal
91 function sets the specified
93 to the logical AND of all signals from the
101 function deletes the specified signal
107 function returns whether the specified
113 function returns whether a specified signal
115 is contained in the signal set.
119 function sets the specified
121 to the logical OR of all signals from the
130 if the set is empty, 0 otherwise.
135 if the signal is a member of the set,
138 The other functions return 0 upon success.
140 indicates an error occurred and the global variable
142 is set to indicate the reason.
144 These functions could fail if one of the following occurs:
148 has an invalid value.
162 functions are FreeBSD extensions, compatible with functions of the same name
163 provided by both musl libc and GNU libc.
165 The rest of these functions are defined by