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40 .Nd manipulate signal sets
46 .Fn sigemptyset "sigset_t *set"
48 .Fn sigfillset "sigset_t *set"
50 .Fn sigaddset "sigset_t *set" "int signo"
52 .Fn sigandset "sigset_t *set" "const sigset_t *left" "const sigset_t *right"
54 .Fn sigdelset "sigset_t *set" "int signo"
56 .Fn sigisemptyset "const sigset_t *set"
58 .Fn sigismember "const sigset_t *set" "int signo"
60 .Fn sigorset "sigset_t *set" "const sigset_t *left" "const sigset_t *right"
62 These functions manipulate signal sets stored in a
68 must be called for every object of type
70 before any other use of the object.
74 function initializes a signal set to be empty.
78 function initializes a signal set to contain all signals.
82 function adds the specified signal
88 function sets the specified
90 to the logical AND of all signals from the
98 function deletes the specified signal
104 function returns whether the specified
110 function returns whether a specified signal
112 is contained in the signal set.
116 function sets the specified
118 to the logical OR of all signals from the
127 if the set is empty, 0 otherwise.
132 if the signal is a member of the set,
135 The other functions return 0 upon success.
137 indicates an error occurred and the global variable
139 is set to indicate the reason.
141 These functions could fail if one of the following occurs:
145 has an invalid value.
159 functions are FreeBSD extensions, compatible with functions of the same name
160 provided by both musl libc and GNU libc.
162 The rest of these functions are defined by