Date: Wed, 11 Feb 2009 13:44:27 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/tools/regression/file/newfileops_on_fork Makefile newfileops_on_fork.c Message-ID: <200902111344.n1BDiZSo033487@repoman.freebsd.org>
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rwatson 2009-02-11 13:44:27 UTC
FreeBSD src repository
Added files:
tools/regression/file/newfileops_on_fork Makefile
newfileops_on_fork.c
Log:
SVN rev 188483 on 2009-02-11 13:44:27Z by rwatson
Add a regresion test to determine whether or not a file descriptor is
allocated in a fork(2)-inheritable way at the beginning or end of an
accept(2) system call. This test creates a test thread and blocks it
in accept(2), then forks a child process which tests to see if the
next available file descriptor is defined or not (EBADF vs EINVAL for
ftruncate(2)).
This detects a regression introduced during the network stack locking
work, in which a very narrow race during which fork(2) from one
thread during accept(2) in a second thread lead to an extra inherited
file descriptor turned into a very wide race ensuring that a
descriptor was leaked into the child even though it hadn't been
returned.
PR: kern/130348
Revision Changes Path
1.1 +8 -0 src/tools/regression/file/newfileops_on_fork/Makefile (new)
1.1 +121 -0 src/tools/regression/file/newfileops_on_fork/newfileops_on_fork.c (new)
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