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 38.Sh NAME 39.Nm psignal , 40.Nm strsignal , 41.Nm sys_siglist , 42.Nm sys_signame 43.Nd system signal messages 44.Sh LIBRARY 45.Lb libc 46.Sh SYNOPSIS 47.In signal.h 48.Ft void 49.Fn psignal "unsigned sig" "const char *s" 50.Vt extern const char * const sys_siglist[] ; 51.Vt extern const char * const sys_signame[] ; 52.In string.h 53.Ft "char *" 54.Fn strsignal "int sig" 55.Sh DESCRIPTION 56The 57.Fn psignal 58and 59.Fn strsignal 60functions locate the descriptive message 61string for a signal number. 62.Pp 63The 64.Fn strsignal 65function accepts a signal number argument 66.Fa sig 67and returns a pointer to the corresponding message string. 68.Pp 69The 70.Fn psignal 71function accepts an signal number argument 72.Fa sig 73and writes it to the standard error. 74If the argument 75.Fa s 76is 77.Pf non- Dv NULL 78and does not point to the null character, 79.Fa s 80is written to the standard error file descriptor 81prior to the message string, 82immediately followed by a colon and a space. 83If the signal number is not recognized 84.Pq Xr sigaction 2 , 85the string 86.Dq "Unknown signal 87is produced. 88.Pp 89The message strings can be accessed directly 90through the external array 91.Va sys_siglist , 92indexed by recognized signal numbers. 93The external array 94.Va sys_signame 95is used similarly and 96contains short, lower-case abbreviations for signals 97which are useful for recognizing signal names 98in user input. 99The defined variable 100.Dv NSIG 101contains a count of the strings in 102.Va sys_siglist 103and 104.Va sys_signame . 105.Sh SEE ALSO 106.Xr sigaction 2 , 107.Xr perror 3 , 108.Xr strerror 3 109.Sh HISTORY 110The 111.Fn psignal 112function appeared in 113.Bx 4.2 . 114