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This is a spiffied-up rebase of a bunch of intermediate changes, presented
as a whole because it is, surprisingly, less confusing that way. The basic
idea is to separate the guts code into categories ranging from generic
stuff that can be the same everywhere and specific variants. The big scary
one is the Darwin support, which actually seems to run okay on 64-bit OS X
10.6. (No other variants were tested.) The other example given is support
for the old clone() syscall on RHEL 4, which affects some wrlinux use cases.
There's a few minor cleanup bits here, such as a function with inconsistent
calling conventions, but nothing really exciting.
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In fakechroot, which pseudo tries to match the functionality of,
the default behavior when creating a symlink with an absolute target
is to prepend the chroot path, so that underlying syscalls will
get the right file.
It is necessary to be able to disable this behavior to create target
filesystems in some cases. To that end, support a new environment
variable, PSEUDO_NOSYMLINKEXP, which disables that behavior.
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Corporate policy is that each module should have a copyright notice.
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This patch adds support for checking whether a file was opened for
reading, writing, or both, as well as tracking append flags. It is
not very well tested. This is preparation for improved host
contamination checking.
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Add chroot() and a large number of things needed to make it work.
The list of intercepted calls is large but not exhaustive.
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* Improve makewrappers handling of function pointer arguments.
* Regenerate wrappers when makewrappers is touched.
* Move path resolution from pseudo_client_op into wrapper
functions.
* Eliminate dependency on PATH_MAX.
* Related cleanup, such as tracking CWD better, and using
the tracked value for getcwd().
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Peter Seebach
Peter Seebach