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PERROR(3)							     PERROR(3)

NAME
       perror, strerror, sys_errlist, sys_nerr - system error messages

SYNOPSIS
       perror(string)
       char *string;

       char *
       strerror(errnum)
       int errnum;

       extern int errno, sys_nerr;
       extern 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.	If  string  is	non-NULL, it is printed, followed by a
       colon, followed by a space, followed by the  message  and  a  new-line.
       Otherwise,  just	 the  message and the new-line are printed.  Most use‐
       fully, the argument string is the name of the  program  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 strerror function
       returns a pointer to the error message string mapped to the error  num‐
       ber errnum.

       The message strings can be accessed directly using the external charac‐
       ter array sys_errlist.  Sys_nerr is the total number of messages in the
       array.	The  use  of these variables is deprecated; strerror should be
       used instead.

SEE ALSO
       intro(2)

4th Berkeley Distribution	 June 24, 1990			     PERROR(3)

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