1.\" $OpenBSD: psignal.3,v 1.12 2007/05/31 19:19:28 jmc Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd $Mdocdate: May 31 2007 $ 31.Dt PSIGNAL 3 32.Os 33.Sh NAME 34.Nm psignal , 35.Nm sys_siglist , 36.Nm sys_signame 37.Nd system signal messages 38.Sh SYNOPSIS 39.Fd #include <signal.h> 40.Ft void 41.Fn psignal "unsigned int sig" "const char *s" 42.Vt extern char *sys_siglist[]; 43.Vt extern char *sys_signame[]; 44.Sh DESCRIPTION 45The 46.Fn psignal 47function locates the descriptive message 48string for the given signal number 49.Fa sig 50and writes it to the standard error. 51.Pp 52If the argument 53.Fa s 54is not 55.Dv NULL 56it is written to the standard error file descriptor 57prior to the message string, 58immediately followed by a colon and a space. 59If the signal number is not recognized 60(see 61.Xr sigaction 2 62for a list), 63the string 64.Dq Unknown signal 65is produced. 66.Pp 67The message strings can be accessed directly using the external array 68.Va sys_siglist , 69indexed by recognized signal numbers. 70The external array 71.Va sys_signame 72is used similarly and contains short, upper-case abbreviations for signals 73which are useful for recognizing signal names in user input. 74The defined value 75.Dv NSIG 76contains a count of the strings in 77.Va sys_siglist 78and 79.Va sys_signame . 80.Sh SEE ALSO 81.Xr sigaction 2 , 82.Xr perror 3 , 83.Xr setlocale 3 , 84.Xr strsignal 3 85.Sh HISTORY 86The 87.Fn psignal 88function appeared in 89.Bx 4.2 . 90