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+.th PERROR III 11/5/73
+.sh NAME
+perror \*- system error messages
+.sh SYNOPSIS
+.ft B
+perror(s)
+.br
+char *s;
+.s3
+int sys\*_nerr;
+.br
+char *sys\*_errlist[];
+.s3
+int errno;
+.ft R
+.br
+.sh DESCRIPTION
+.it Perror
+produces a short error message
+describing the last error encountered during a call
+to the system from a C program.
+First the argument string
+.it s
+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
+.it errno,
+which is set when errors occur but not cleared when
+non-erroneous calls are made.
+.s3
+To simplify variant formatting
+of messages, the vector of message strings
+.it sys\*_errlist
+is provided;
+.it errno
+can be used as an index in this table to get the
+message string without the newline.
+.it Sys\*_nerr
+is the largest message number 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.
+.sh "SEE ALSO"
+Introduction to System Calls
+.sh BUGS