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.\" 34.Dd February 27, 1995 35.Dt PSIGNAL 3 36.Os BSD 4.2 37.Sh NAME 38.Nm psignal , 39.Nm sys_siglist , 40.Nm sys_signame 41.Nd system signal messages 42.Sh SYNOPSIS 43.Fd #include <sys/signal.h> 44.Ft void 45.Fn psignal "unsigned sig" "const char *s" 46.Vt extern const char * const sys_siglist[]; 47.Vt extern const char * const sys_signame[]; 48.Sh DESCRIPTION 49The 50.Fn psignal 51function locates the descriptive message 52string for the given signal number 53.Fa sig 54and writes it to the standard error. 55.Pp 56If the argument 57.Fa s 58is 59.Pf non- Dv NULL 60it is written to the standard error file descriptor 61prior to the message string, 62immediately followed by a colon and a space. 63If the signal number is not recognized 64.Pq Xr sigaction 2 , 65the string 66.Dq "Unknown signal 67is produced. 68.Pp 69The message strings can be accessed directly 70through the external array 71.Va sys_siglist , 72indexed by recognized signal numbers. 73The external array 74.Va sys_signame 75is used similarly and 76contains short, lower-case abbreviations for signals 77which are useful for recognizing signal names 78in user input. 79The defined variable 80.Dv NSIG 81contains a count of the strings in 82.Va sys_siglist 83and 84.Va sys_signame . 85.Sh SEE ALSO 86.Xr sigaction 2 , 87.Xr perror 3 88.Sh HISTORY 89The 90.Fn psignal 91function appeared in 92.Bx 4.2 . 93