1.\" $NetBSD: psignal.3,v 1.17 2010/08/27 08:38:41 christos 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.\" @(#)psignal.3 8.2 (Berkeley) 2/27/95 31.\" 32.Dd August 27, 2010 33.Dt PSIGNAL 3 34.Os 35.Sh NAME 36.Nm psignal , 37.Nm psiginfo , 38.Nm sys_siglist , 39.Nm sys_signame 40.Nd system signal messages 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In signal.h 45.Ft void 46.Fn psignal "int sig" "const char *s" 47.Fn psiginfo "const siginfo_t *si" "const char *s" 48.Vt extern const char * const sys_siglist[]; 49.Vt extern const char * const sys_signame[]; 50.Sh DESCRIPTION 51The 52.Fn psignal 53function locates the descriptive message 54string for the given signal number 55.Fa sig 56and writes it to the standard error. 57.Pp 58If the argument 59.Fa s 60is 61.Pf non- Dv NULL 62it is written to the standard error file descriptor 63prior to the message string, 64immediately followed by a colon and a space. 65If the signal number is not recognized 66.Pq Xr sigaction 2 , 67the string 68.Dq "Unknown signal" 69is produced. 70.Pp 71The 72.Fn psiginfo 73function produces the same output as the 74.Fn psignal 75function, only it uses the signal number information from the 76.Fa si 77argument. 78.Pp 79The message strings can be accessed directly using the external array 80.Va sys_siglist , 81indexed by recognized signal numbers. 82The external array 83.Va sys_signame 84is used similarly and contains short, upper-case abbreviations for signals 85which are useful for recognizing signal names in user input. 86The defined variable 87.Dv NSIG 88contains a count of the strings in 89.Va sys_siglist 90and 91.Va sys_signame . 92.Sh SEE ALSO 93.Xr sigaction 2 , 94.Xr perror 3 , 95.Xr setlocale 3 , 96.Xr strsignal 3 97.Sh HISTORY 98The 99.Fn psignal 100function appeared in 101.Bx 4.2 . 102The 103.Fn psiginfo 104function appeared in 105.Nx 6.0 . 106