NAME
    errno - return a system error message

SYNOPSIS
    errno(errnum)

TYPES
    errnum	int

    return	string

DESCRIPTION
    If a file builtin function such as fopen() encounters an error,
    it will return an errno number.  This function will convert this
    number into a somewhat more meaningful string.

    Note that errno() may return different strings on different systems.

EXAMPLE
    > badfile = fopen("not_a_file", "r")
    > if (!isfile(badfile)) print "error #" : badfile : ":", errno(badfile);
    error #2: No such file or directory

    > print errno(13)
    Permission denied

    > errno(31)
	    "Too many links"

LIMITS
    none

LIBRARY
    none

SEE ALSO
    errno, fclose, feof, ferror, fflush, fgetc, fgetline, files, fopen,
    fprintf, isfile, printf, prompt