I'm writing a utility that parses the device tree in /proc/device-tree, and in
order to read a property into memory, I have to first find out how large it is.
 So I have the following code:

        off_t off;
        int f;

        f = open(filename, O_RDONLY);
        if (f == -1) {
                perror(__func__);
                return NULL;
        }

        off = lseek(f, 0, SEEK_END);
        if (off == -1) {
                perror(__func__);
                goto fail;
        }

The lseek() call returns -1, and errno is set to EINVAL.  According to the man
page, this means:

       EINVAL The  whence  argument  is  not a proper value, or the resulting
              file offset would be negative for a regular file, block special
              file, or directory.

Is there a limitation for the implementation of /proc/device-tree that prevents
lseek() from working?  If so, how do I determine the size of a property?

-- 
Timur Tabi
Linux kernel developer at Freescale
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