110 lines
3.2 KiB
Groff
110 lines
3.2 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)psignal.3 8.2 (Berkeley) 2/27/95
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.\" $FreeBSD$
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.\"
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.Dd February 4, 2011
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.Dt PSIGNAL 3
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.Os
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.Sh NAME
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.Nm psignal ,
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.Nm strsignal ,
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.Nm sys_siglist ,
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.Nm sys_signame
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.Nd system signal messages
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In signal.h
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.Ft void
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.Fn psignal "unsigned sig" "const char *s"
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.Vt extern const char * const sys_siglist[] ;
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.Vt extern const char * const sys_signame[] ;
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.In string.h
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.Ft "char *"
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.Fn strsignal "int sig"
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.Sh DESCRIPTION
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The
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.Fn psignal
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and
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.Fn strsignal
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functions locate the descriptive message
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string for a signal number.
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.Pp
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The
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.Fn strsignal
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function accepts a signal number argument
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.Fa sig
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and returns a pointer to the corresponding message string.
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.Pp
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The
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.Fn psignal
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function accepts a signal number argument
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.Fa sig
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and writes it to the standard error.
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If the argument
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.Fa s
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is
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.Pf non- Dv NULL
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and does not point to the null character,
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.Fa s
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is written to the standard error file descriptor
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prior to the message string,
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immediately followed by a colon and a space.
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If the signal number is not recognized
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.Pq Xr sigaction 2 ,
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the string
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.Dq "Unknown signal"
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is produced.
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.Pp
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The message strings can be accessed directly
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through the external array
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.Va sys_siglist ,
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indexed by recognized signal numbers.
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The external array
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.Va sys_signame
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is used similarly and
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contains short, upper-case abbreviations for signals
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which are useful for recognizing signal names
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in user input.
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The defined variable
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.Dv NSIG
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contains a count of the strings in
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.Va sys_siglist
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and
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.Va sys_signame .
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr perror 3 ,
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.Xr strerror 3
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.Sh HISTORY
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The
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.Fn psignal
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function appeared in
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.Bx 4.2 .
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