Lennart Poettering
14f594b995
An stdio FILE* stream usually refers to something with a file descriptor, but that's just "usually". It doesn't have to, when taking fmemopen() and similar into account. Most of our calls to fileno() assumed the call couldn't fail. In most cases this was correct, but in some cases where we didn't know whether we work on files or memory we'd use the returned fd as if it was unconditionally valid while it wasn't, and passed it to a multitude of kernel syscalls. Let's fix that, and do something reasonably smart when encountering this case. (Running test-fileio with this patch applied will remove tons of ioctl() calls on -1).
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