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[v2] treewide: treatment of errno and other cleanups
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with small manual cleanups for style.
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For low end embedded systems 4 MiB for each journal file is a lot of
memory. Journald will use at least 512 KiB even if JOURNAL_FILE_SIZE_MIN is
set to less than that so just use 512 KiB.
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manpage says:
posix_fallocate() returns zero on success, or an error number on
failure. Note that errno is not set.
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Our functions return negative error codes.
Do not rely on errno being set after calling our own functions.
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pread() returns -1 on error and sets errno. Do not use the -1 as errno.
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This replaces the use of ftell() with ftello() for 64-bit size on all
archs.
Also drops a pointless check for NULL before calling strbuf_cleanup().
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write_catalog() use the hashmap only to get its size. The size is
already given in parameter 'n'.
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When we enumerate journal files and encounter an invalid one, remember
which this, and show it to the user.
Note the possibly slightly surprising logic here: we store only one path
per error code. This means we show all error kinds but not every actual
error we encounter. This has the benefit of not requiring us to keep a
potentially unbounded list of errors with their sources around, but can
still provide a pretty complete overview on the errors we encountered.
Fixes #1669.
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- Always print a debug log message about files and directories we cannot
open right when it happens instead of the caller, thus reducing the
number of places where we need to generate the debug message.
- Always push the errors we encounter immediately into the error set,
when we run into them, instead of in the caller. Thus, we never forget
to push them in.
- Use stack instead of heap memory where we can.
- Make remove_file() void, since it cannot fail anyway and always
returned 0.
- Make local machine check of journal directories explicit in a
function, to make things more readable.
- Port to all directory listing loops FOREACH_DIRENT_ALL()
- sd-daemon is library code, hence never log at higher log levels than
LOG_DEBUG.
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When reading stuff, we should only return EIO when an actual read error
occured, not when we don't like the data for whatever reason.
We already return ENODATA for all other kinds of file truncation, hence
do the same for the most obvious kind, so that callers know what ENODATA
means.
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sd-journal.c: port to extract_first_word
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Otherwise we might run into deadlocks, when journald blocks on the
notify socket on PID 1, and PID 1 blocks on IPC to dbus-daemon and
dbus-daemon blocks on logging to journald. Break this cycle by making
sure that journald never ever blocks on PID 1.
Note that this change disables support for event loop watchdog support,
as these messages are sent in blocking style by sd-event. That should
not be a big loss though, as people reported frequent problems with the
watchdog hitting journald on excessively slow IO.
Fixes: #1505.
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capability-util.[ch]
The files are named too generically, so that they might conflict with
the upstream project headers. Hence, let's add a "-util" suffix, to
clarify that this are just our utility headers and not any official
upstream headers.
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Also, move a couple of more path-related functions to path-util.c.
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We don't need two functions that do essentialy the same, hence drop
path_get_parent(), and stick to dirname_malloc(), but move it to
path-util.[ch].
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split up util.[ch] into more pieces, and other stuff
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journald-server: port to extract_first_word
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Various changes to src/basic/
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There are more than enough to deserve their own .c file, hence move them
over.
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journal: fix error handling when compressing journal objects
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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This really deserves its own file, given how much code this is now.
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Let's introduce a common function that makes relative paths absolute and
warns about any errors while doing so.
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get_current_dir_name() can return a variety of errors, not just ENOMEM,
hence don't blindly turn its errors to ENOMEM, but return correct errors
in path_make_absolute_cwd().
This trickles down into a couple of other functions, some of which
receive unrelated minor fixes too with this commit.
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Let's make sure we handle compression errors properly, and don't
misunderstand an error for success.
Also, let's actually compress things if lz4 is enabled.
Fixes #1662.
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