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* dircat.c, dircat.h, main.c, main.h, netfs.c, process.c, process.h,
procfs.c, procfs.h, procfs_dir.c, procfs_dir.h, proclist.c,
proclist.h, rootdir.c, rootdir.h: Add copyright notices.
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This is necessary for top, for instance, which keeps some files open and
re-reads them regularly. As an extra bonus we can drop the refresh hack.
* procfs.c, procfs.h: Remove the refresh hack.
(procfs_refresh): New function, invalidates the cached contents.
* netfs.c (netfs_attempt_read, netfs_get_dirents): Call
procfs_refresh when the read is from offset 0.
* proclist.c (proclist_make_node): Remove the refresh hack.
* dircat.c (dircat_make_node): Likewise.
(dircat_get_contents): Use procfs_refresh to avoid keeping old data
from the component nodes.
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* dircat.c, dircat.h (dircat_make_node): Use an explicit
array size for DIRS, fail with ENOMEM is any of them is NULL, and
release the reference on the non-NULL nodes on any error.
* main.c (root_make_node): Use the new interface.
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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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* 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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