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xen-devel
Re: [Xen-devel] [PATCH] libxen-3.0 (libxc rewrite)
Christian Limpach wrote:
On Mon, 21 Mar 2005 15:25:09 -0600, Anthony Liguori <aliguori@xxxxxxxxxx> wrote:
o Provide consistent error semantics for all functions (-errno is
returned on error).
Why -errno? What's wrong with regular errno, like used everywhere
else in userspace?
errno's a global variable and it's way to easy to lose it's value. For
instance:
if (read(fd, buffer, sizeof(buffer)) == -1) {
close(fd);
perror("read");
}
Doesn't do what you'd expect. It gets particularly hairy when you're
not sure what functions modify errno and which functions don't.
Regards,
Anthony Liguori
christian
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