NAME
	  perror - Writes a message explaining a function error

     LIBRARY
	  Standard C Library (libc.a)

     SYNOPSIS
	  #include <errno.h>
	  void perror (
	       char *string );
	  extern char *sys_errlist[ ];
	  extern int sys_nerr;


     PARAMETERS
	  string    A parameter	string that contains the name of the
		    program that caused	the error. The ensuing printed
		    message contains this string, a colon, and an
		    explanation	of the error.


     DESCRIPTION
	  The perror() function	writes a message on the	standard error
	  output that describes	the last error encountered by a	func-
	  tion or library function. The	error message includes the
	  string parameter string followed by a	: (colon), a blank,
	  the message, and a newline character.	The string parameter
	  string should	include	the name of the	program	that caused
	  the error. The error number is taken from errno, which is
	  set when an error occurs, but	is not cleared when a success-
	  ful call is made.

	  Use errno as an index	into the sys_errlist table to get the
	  message string without the newline character.	The largest
	  message number provided in the table is sys_nerr. Be sure to
	  check	sys_nerr because new error codes can be	added to the
	  system before	they are added to the table.

     NOTES
	  AES Support Level:
			 Full use


     RELATED INFORMATION
	  Functions: printf(3)