PERROR(3-BSD)       RISC/os Reference Manual        PERROR(3-BSD)



NAME
     perror, sys_errlist, sys_nerr - system error messages

SYNOPSIS
     perror(s)
     char *s;

     int sys_nerr;
     char *sys_errlist[];

DESCRIPTION
     perror produces a short error message on the standard error
     file describing the last error encountered during a call to
     the system from a C program.  First the argument string s is
     printed, then a colon, then the message and a new-line.
     Most usefully, the argument string is the name of the pro-
     gram which incurred the error.  The error number is taken
     from the external variable errno (see intro(2)), which is
     set when errors occur but not cleared when non-erroneous
     calls are made.

     To simplify variant formatting of messages, the vector of
     message strings sys_errlist is provided; errno can be used
     as an index in this table to get the message string without
     the newline.  sys_nerr is the number of messages 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)
























                        Printed 11/19/92                   Page 1