perror(3C)          (C Programming Language Utilities)           perror(3C)


   NAME
         perror - print system error messages

   SYNOPSIS
         #include <stdio.h>

         void perror (const char *s);

   DESCRIPTION
         perror produces a message on the standard error output (file
         descriptor 2), 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.
         (However, if s is a null pointer or points to a null string, the
         colon is not printed.)  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.

   SEE ALSO
         intro(2), fmtmsg(3C), strerror(3C).
































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