79ac896751
takes an int arg and is prototyped in <string.h>. It has the opposite interface botches to psignal(3) which takes a bogus unsigned arg but is prototyped in the right place. This is not the last of the interface problems for strsignal(). We obtained it from NetBSD, but NetBSD has moved its prototype to <unistd.h>. strsignal() should return const char *, but it returns char * for historical reasons. NetBSD declares it as returning __aconst char, where __aconst is normally empty but can be set to `const' to give better error checking. glibc-2.1.1 prototypes strsignal() in <string.h>.
112 lines
3.4 KiB
Groff
112 lines
3.4 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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 27, 1995
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.Dt PSIGNAL 3
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.Os BSD 4.2
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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 SYNOPSIS
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.Fd #include <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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.Fd #include <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 an 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, lower-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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