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30 .\" @(#)sigsetops.3 8.1 (Berkeley) 6/4/93
41 .Nd manipulate signal sets
47 .Fn sigemptyset "sigset_t *set"
49 .Fn sigfillset "sigset_t *set"
51 .Fn sigaddset "sigset_t *set" "int signo"
53 .Fn sigdelset "sigset_t *set" "int signo"
55 .Fn sigismember "sigset_t *set" "int signo"
57 These functions manipulate signal sets stored in a
63 must be called for every object of type
65 before any other use of the object.
69 function initializes a signal set to be empty.
73 function initializes a signal set to contain all signals.
77 function adds the specified signal
83 function deletes the specified signal
89 function returns whether a specified signal
91 is contained in the signal set.
96 are provided as macros, but actual functions are available
97 if their names are undefined (with #undef
103 if the signal is a member of the set,
105 The other functions return 0 upon success.
107 indicates an error occurred and the global variable
109 is set to indicate the reason.
111 These functions could fail if one of the following occurs:
115 has an invalid value.
123 These functions conform to