.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)strerror.3 6.1 (Berkeley) %G%
perror, sys_errlist, sys_nerr \- system error messages
produces a short error message on the standard error file
describing the last error encountered during a call
to the system from a C program.
First the argument string
is printed, then a colon, then the message and a new-line.
Most usefully, the argument string is the name
of the program which incurred the error.
The error number is taken from the external variable
which is set when errors occur but not cleared when
non-erroneous calls are made.
To simplify variant formatting of messages, the vector of message strings
can be used as an index in this table to get the
message string without the newline.
is the number of messages provided for in the table;
it should be checked because new error codes may be added to the system before
they are added to the table.