xref: /freebsd/lib/libc/gen/sigsetops.3 (revision 74bf4e164ba5851606a27d4feff27717452583e5)
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32.\"     @(#)sigsetops.3	8.1 (Berkeley) 6/4/93
33.\" $FreeBSD$
34.\"
35.Dd June 4, 1993
36.Dt SIGSETOPS 3
37.Os
38.Sh NAME
39.Nm sigemptyset ,
40.Nm sigfillset ,
41.Nm sigaddset ,
42.Nm sigdelset ,
43.Nm sigismember
44.Nd manipulate signal sets
45.Sh LIBRARY
46.Lb libc
47.Sh SYNOPSIS
48.In signal.h
49.Ft int
50.Fn sigemptyset "sigset_t *set"
51.Ft int
52.Fn sigfillset "sigset_t *set"
53.Ft int
54.Fn sigaddset "sigset_t *set" "int signo"
55.Ft int
56.Fn sigdelset "sigset_t *set" "int signo"
57.Ft int
58.Fn sigismember "const sigset_t *set" "int signo"
59.Sh DESCRIPTION
60These functions manipulate signal sets stored in a
61.Fa sigset_t .
62Either
63.Fn sigemptyset
64or
65.Fn sigfillset
66must be called for every object of type
67.Fa sigset_t
68before any other use of the object.
69.Pp
70The
71.Fn sigemptyset
72function initializes a signal set to be empty.
73.Pp
74The
75.Fn sigfillset
76function initializes a signal set to contain all signals.
77.Pp
78The
79.Fn sigaddset
80function adds the specified signal
81.Fa signo
82to the signal set.
83.Pp
84The
85.Fn sigdelset
86function deletes the specified signal
87.Fa signo
88from the signal set.
89.Pp
90The
91.Fn sigismember
92function returns whether a specified signal
93.Fa signo
94is contained in the signal set.
95.Pp
96These functions
97are provided as macros in the include file <signal.h>.
98Actual functions are available
99if their names are undefined (with
100.Ic #undef Ar name ) .
101.Sh RETURN VALUES
102The
103.Fn sigismember
104function returns 1
105if the signal is a member of the set,
1060 otherwise.
107The other functions return 0.
108.Sh ERRORS
109Currently no errors are detected.
110.Sh SEE ALSO
111.Xr kill 2 ,
112.Xr sigaction 2 ,
113.Xr sigpending 2 ,
114.Xr sigprocmask 2 ,
115.Xr sigsuspend 2
116.Sh STANDARDS
117These functions are defined by
118.St -p1003.1-88 .
119