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Question :
Why use _exit rather than exit in the child branch of a fork?
Category Unix/ Linux Operating System Interview Questions
Rating (0.3) By 11 users
Added on 4/29/2009
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Answers:

In the child branch of a fork(), it is normally incorrect to use
exit(), because that can lead to stdio buffers being flushed
twice, and temporary files being unexpectedly removed. In C++ code the
situation is worse, because destructors for static objects may be run
incorrectly. (There are some unusual cases, like daemons, where the
parent should call _exit() rather than the child; the
basic rule, applicable in the overwhelming majority of cases, is that
exit() should be called only once for each entry into
main.)



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