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* procfs.h: Make CONTENTS_LEN an ssize_t rather than a size_t,
and document the change.
* procfs.c (procfs_get_contents): Initialize CONTENTS_LEN to a
negative value, and fail with ENOMEM if it's still negative after the
callback returns. (everywhere): Update to ssize_t.
* dircat.c, netfs.c, process.c,
procfs_dir.c, proclist.c, rootdir.c: Update to
ssize_t and the new GET_CONTENTS semantics.
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* procfs.h (procfs_cleanup_contents_with_free,
procfs_cleanup_contents_with_vm_deallocate, procfs_get_contents,
struct procfs_ops): Change CONTENTS from a void pointer to a char one.
* dircat.c, netfs.c, process.c, procfs.c,
procfs_dir.c, proclist.c, rootdir.c: Update.
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* procfs.c, procfs.h (procfs_node_chown,
procfs_node_chmod, procfs_node_chtype): New functions, encapsulate
access to some nn_stat fields.
* process.c (process_lookup_pid): Use procfs_node_chown instead
of direct access.
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* procfs.h, procfs.c (procfs_make_ino): New function,
invents an inode number by hashing the parent's and the name of an
entry. (procfs_lookup): Use it to assign an inode number to child
nodes at lookup time.
* main.c (root_make_node): Assign an arbitrary inode number to
the root directory.
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* procfs.c (procfs_lookup): Keep track of the parent directory,
implement the lookup of the dot-directories. (procfs_cleanup):
Release the reference to the parent node, if applicable.
* procfs.h: Add a comment about the parent reference.
* netfs.c (netfs_attempt_lookup): Lock the looked up node after
the directory has been unlocked, in case they are the same.
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* dircat.c, dircat.h: New files, merge directories.
* Makefile: Add the dircat module.
* main.c: Use dircat to merge the proclist into the root
directory, instead of having it as a stand-alone one.
* procfs.h, procfs.c: Add a "refresh hack" to have the
contents of the root directory recreated on each request.
* proclist.c (proclist_make_node): Enable the hack in question.
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* procfs.c, procfs.h: Extend the signature of the
cleanup_contents callback in the procfs_node_ops structure to include
the hook and contents_len. (cleanup_contents_with_free,
cleanup_contents_with_vm_deallocate): New functions, can be used as
a cleanup_contents callback for simple cases.
* procfs_dir.c, procfs_dir.h (procfs_dir_make_node):
Update, add a cleanup callback, make sure the cleanup callback is
invoked if there is an error.
* proclist.c (proclist_make_node), main.c (main): Update to match
the new interfaces.
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* procfs.c (procfs_make_node): Invoke the cleanup callback on
failure, so that callers don't have to.
* procfs.h: Document the change.
* procfs_dir.c (procfs_dir_make_node), procfs_file.c
(procfs_file_make_node), proclist.c (proclist_make_node):
Update to reflect the change.
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* procfs.h: New file; basic interfaces for procfs nodes.
* procfs.c: New file; implement the basic infrastructure.
* netfs.c: New file; bridge libnetfs and the procfs interfaces.
* main.c: New file; mostly a "Hello, World!" for now.
* Makefile: New file; standalone for now.
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