On 06/21/2012 08:01 AM, Lionel Elie Mamane wrote:
For my education: why can't we set the O_CLOEXEC/FD_CLOEXEC flag on
these file descriptors? This would - presumably - automatically close
the fds *after* any thread from the "old process" code could possibly
use them, but *before* any code of the new process (after exec())
executes?
There are two reasons:
1 Availability: While CLOEXEC is part of at least SUSv4, I'm not sure
it is indeed available on all relevant platforms.
2 Composability: To be effective (beyond the concrete bug scenario,
where it happened to be a file opened by "our own code" that caused the
problem), every open(2) call would need to use O_CLOEXEC, even in
library code we cannot control.
Stephan
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