PERROR(3C-SVR4)     RISC/os Reference Manual      PERROR(3C-SVR4)



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).
































                        Printed 11/19/92                   Page 1