NAME
    freopen - close (if necessary) and reopen a filestream

SYNOPSIS
    freopen(fs, mode) or freopen(fs, mode, filename)

TYPES
    fs		open or closed file stream
    mode	one of the strings "r", "w", "a", "r+", "w+, "a+"
    filename	string

    return	null or error value

DESCRIPTION
    With two arguments, this function closes the file stream fs and
    attempts to reopen it with the specified mode.  A non-null value
    is returned only if the attempt fails.

    With three arguments, fs, if open, is closed, and an attempt is made to
    open the file with the specified name and assign it to the stream
    fs.  A non-null value is returned only if the attempt fails.

EXAMPLE

    > f = fopen("/tmp/junk", "w")
    > fputs(f, "Leonard Euler")
    > freopen(f, "r")
    > fgets(f)
	    "Leonard Euler"
    > !chmod u-w /tmp/junk
    > freopen(f, "w")
	    Error 10013

LIMITS
    none - XXX - is this correct?

LIBRARY
    none - XXX - is this correct?

SEE ALSO
    errno, fclose, feof, ferror, fflush, fgetc, fgetline, fgets, files, fopen,
    fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt