man3/sigsetops.3

   1 .\" Copyright (c) 1994 Mike Battersby
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  23 .\" Modified by aeb, 960721
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  25 .TH SIGSETOPS 3 1994-09-24 "Linux 1.0" "Linux Programmer's Manual"
  26
  27 .SH NAME
  28 sigemptyset, sigfillset, sigaddset, sigdelset, sigismember \- POSIX
  29 signal set operations.
  30
  31 .SH SYNOPSIS
  32 .B #include <signal.h>
  33 .sp 2
  34 .BI "int sigemptyset(sigset_t *" set );
  35 .sp
  36 .BI "int sigfillset(sigset_t *" set );
  37 .sp
  38 .BI "int sigaddset(sigset_t *" set ", int " signum );
  39 .sp
  40 .BI "int sigdelset(sigset_t *" set ", int " signum );
  41 .sp
  42 .BI "int sigismember(const sigset_t *" set ", int " signum );
  43
  44 .SH DESCRIPTION
  45 The
  46 .BR sigsetops (3)
  47 functions allow the manipulation of POSIX signal sets.
  48 .PP
  49 .B sigemptyset
  50 initializes the signal set given by
  51 .I set
  52 to empty, with all signals excluded from the set.
  53 .PP
  54 .B sigfillset
  55 initializes
  56 .I set
  57 to full, including all signals.
  58 .PP
  59 .B sigaddset
  60 and
  61 .B sigdelset
  62 add and delete respectively signal
  63 .I signum
  64 from
  65 .IR set .
  66 .PP
  67 .B sigismember
  68 tests whether
  69 .I signum
  70 is a member of
  71 .IR set .
  72 .SH "RETURN VALUE"
  73 .BR sigemptyset ", " sigfillset ", " sigaddset
  74 and
  75 .B sigdelset
  76 return 0 on success and \-1 on error.
  77 .PP
  78 .B sigismember
  79 returns 1 if
  80 .I signum
  81 is a member of
  82 .IR set ,
  83 0 if
  84 .I signum
  85 is not a member, and \-1 on error.
  86 .SH ERRORS
  87 .TP
  88 .B EINVAL
  89 .I sig
  90 is not a valid signal.
  91 .SH "CONFORMING TO"
  92 POSIX
  93 .SH "SEE ALSO"
  94 .BR sigaction (2),
  95 .BR sigpending (2),
  96 .BR sigprocmask (2),
  97 .BR sigsuspend (2)