perror(3C)           COMPATIBILITY FUNCTIONS           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 mes-
     sage and a newline.  (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).
































          Last change: C Programming Language Utilities         1