gen/sigsetops.3

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  32 .\"     @(#)sigsetops.3 8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/gen/sigsetops.3,v 1.6 2001/10/01 16:08:51 ru Exp $
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  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
  60 These functions manipulate signal sets stored in a
  61 .Fa sigset_t .
  62 Either
  63 .Fn sigemptyset
  64 or
  65 .Fn sigfillset
  66 must be called for every object of type
  67 .Fa sigset_t
  68 before any other use of the object.
  69 .Pp
  70 The
  71 .Fn sigemptyset
  72 function initializes a signal set to be empty.
  73 .Pp
  74 The
  75 .Fn sigfillset
  76 function initializes a signal set to contain all signals.
  77 .Pp
  78 The
  79 .Fn sigaddset
  80 function adds the specified signal
  81 .Fa signo
  82 to the signal set.
  83 .Pp
  84 The
  85 .Fn sigdelset
  86 function deletes the specified signal
  87 .Fa signo
  88 from the signal set.
  89 .Pp
  90 The
  91 .Fn sigismember
  92 function returns whether a specified signal
  93 .Fa signo
  94 is contained in the signal set.
  95 .Pp
  96 These functions
  97 are provided as macros in the include file <signal.h>.
  98 Actual functions are available
  99 if their names are undefined (with #undef
 100 .Em name ) .
 101 .Sh RETURN VALUES
 102 The
 103 .Fn sigismember
 104 function returns 1
 105 if the signal is a member of the set,
 106 0 otherwise.
 107 The other functions return 0.
 108 .Sh ERRORS
 109 Currently no errors are detected.
 110 .Sh SEE ALSO
 111 .Xr kill 2 ,
 112 .Xr sigaction 2 ,
 113 .Xr sigsuspend 2
 114 .Sh STANDARDS
 115 These functions are defined by
 116 .St -p1003.1-88 .