On 2016-11-02 at 4:33 ron minnich wrote:
> https://linux.die.net/man/3/explain_mmap
>
> "our kernel only returns error numbers so we wrote an entire new library to
> tell you what the kernel should have told you in the first place."
>
> the mind reels.
>
damn. even worse, from the example on that page:
void *result = mmap(data, data_size, prot, flags, fildes, offset);
if (!result)
{
fprintf(stderr, "%s\n", explain_mmap(data, data_size, prot, flags,
fildes, offset));
exit(EXIT_FAILURE);
}
checking !result is wrong. mmap returns MAP_FAILED (basically -1) on
error, not 0. we had a brutal bug a long time ago that got that wrong.
barret
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