1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)psignal.3 8.2 (Berkeley) 2/27/95 33.\" $FreeBSD$ 34.\" 35.Dd February 27, 1995 36.Dt PSIGNAL 3 37.Os BSD 4.2 38.Sh NAME 39.Nm psignal , 40.Nm strsignal , 41.Nm sys_siglist , 42.Nm sys_signame 43.Nd system signal messages 44.Sh SYNOPSIS 45.Fd #include <signal.h> 46.Ft void 47.Fn psignal "unsigned sig" "const char *s" 48.Ft "char *" 49.Fn strsignal "unsigned sig" 50.Vt extern const char * const sys_siglist[]; 51.Vt extern const char * const sys_signame[]; 52.Sh DESCRIPTION 53The 54.Fn psignal 55and 56.Fn strsignal 57functions locate the descriptive message 58string for a signal number. 59.Pp 60The 61.Fn strsignal 62function accepts a signal number argument 63.Fa sig 64and returns a pointer to the corresponding message string. 65.Pp 66The 67.Fn psignal 68function accepts an signal number argument 69.Fa sig 70and writes it to the standard error. 71If the argument 72.Fa s 73is 74.Pf non- Dv NULL 75and does not point to the null character, 76.Fa s 77is written to the standard error file descriptor 78prior to the message string, 79immediately followed by a colon and a space. 80If the signal number is not recognized 81.Pq Xr sigaction 2 , 82the string 83.Dq "Unknown signal 84is produced. 85.Pp 86The message strings can be accessed directly 87through the external array 88.Va sys_siglist , 89indexed by recognized signal numbers. 90The external array 91.Va sys_signame 92is used similarly and 93contains short, lower-case abbreviations for signals 94which are useful for recognizing signal names 95in user input. 96The defined variable 97.Dv NSIG 98contains a count of the strings in 99.Va sys_siglist 100and 101.Va sys_signame . 102.Sh SEE ALSO 103.Xr sigaction 2 , 104.Xr perror 3 , 105.Xr strerror 3 106.Sh HISTORY 107The 108.Fn psignal 109function appeared in 110.Bx 4.2 . 111