mmap(): enodev

[Valdis.Kletnieks at vt.edu]

On Sun, 25 May 2014 12:46:46 -0000, Pietro Paolini said:

>         if ((fd = open(FILENAME, O_RDWR) == -1)) {

This sort of whoopsie is why most of the kernel uses this style:

	fd = open(FILENAME, O_RDWR);
	if (fd == -1) {

It may take an extra line of codde, but greatly reduces the chances of
commiting a operator precedence faux pas or similar bug....
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