add directory Minix

Minix/1.7.5/MANUALS/CAT3/PERROR.3

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+NAME
+	  perror, errno, sys_errlist, sys_nerr - system	error messages
+SYNTAX
+	  void perror (s)
+	  char *s;
+	  extern int errno;
+	  extern char *sys_errlist[ ];
+	  extern int sys_nerr;
+DESCRIPTION
+	  Perror produces a message on the standard error output,
+	  describing the last error encountered	during a call to a
+	  system or library function.  The argument string s is
+	  printed first, then a	colon and a blank, then	the message
+	  and a	new-line.  To be of most use, the argument string
+	  should include the name of the program that incurred the
+	  error.  The error number is taken from the external variable
+	  errno, which is set when errors occur	but not	cleared	when
+	  non-erroneous	calls are made.
+	  To simplify variant formatting of messages, the array	of
+	  message strings sys_errlist is provided; errno can be	used
+	  as an	index in this table to get the message string without
+	  the new-line.	 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.
+SEE ALSO
+	  intro(2).
+				  
+