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Previously, the logging sockets were asynchronous and if clogged we'd
lose messages. We did this to be extra careful given that PID 1 might
need to spawn the logging daemon as response to PID 1's own log messages
and we really should avoid a deadlock in that case.
As it turns out this causes loss of too many messages, hence make the
socket blocking again, however put a time limit on it to avoid unbounded
deadlocks in the unlikely case they happen.
https://bugs.freedesktop.org/show_bug.cgi?id=66664
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Before, we would initialize many fields twice: first
by filling the structure with zeros, and then a second
time with the real values. We can let the compiler do
the job for us, avoiding one copy.
A downside of this patch is that text gets slightly
bigger. This is because all zero() calls are effectively
inlined:
$ size build/.libs/systemd
text data bss dec hex filename
before 897737 107300 2560 1007597 f5fed build/.libs/systemd
after 897873 107300 2560 1007733 f6075 build/.libs/systemd
… actually less than 1‰.
A few asserts that the parameter is not null had to be removed. I
don't think this changes much, because first, it is quite unlikely
for the assert to fail, and second, an immediate SEGV is almost as
good as an assert.
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This reverts commit 4a01181e460686d8b4a543b1dfa7f77c9e3c5ab8.
This patch broke LOG_TARGET_AUTO, i.e. automatic selection of STDERR if
it is a TTY with a fallback on the journal and kmsg otherwise.
The general rule should probably be:
log_open() -- open the "best" possible logging channel according to
log_target configuration.
log_dispatch() -- don't open any log channels ever, with the exception
of kmsg since that has no drawbacks. And do this only on true errors of
the better log channel, not just when it wasn't opened.
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write_to_journal() returns 0 if journal_fd is closed and nothing is
written. We need to make sure we'll try log_open_kmsg() then to make the
fallback work for "journal-or-kmsg".
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The new microhttpd logger doesn't know this information. It is
better to log nothing than fake values.
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Explicit zeroing is replaced with initialization to {0}.
No functional change.
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Adding UNIT= to log lines allows them to be shown
in 'systemctl status' output, etc.
A new set of macros and functions is added. This allows for less
verbose notation than using log_struct() explicitly.
The set of logging functions is expanded to take a pair of arguments
(e.g. "UNIT=" and the RHS) which add an extra line to the structured
log entry. This can be used to add macros which add a different
identifier later on.
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https://bugs.freedesktop.org/show_bug.cgi?id=55213
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https://bugs.freedesktop.org/show_bug.cgi?id=54766
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__secure_getenv() rather than getenv()
It's better to be safe than sorry.
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The callers' code gets smaller.
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deadlocks
This makes all generators log to kmsg by default.
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truncation
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We finally got the OK from all contributors with non-trivial commits to
relicense systemd from GPL2+ to LGPL2.1+.
Some udev bits continue to be GPL2+ for now, but we are looking into
relicensing them too, to allow free copy/paste of all code within
systemd.
The bits that used to be MIT continue to be MIT.
The big benefit of the relicensing is that closed source code may now
link against libsystemd-login.so and friends.
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internal libraries
Before:
$ ldd /lib/systemd/systemd-timestamp
linux-vdso.so.1 => (0x00007fffb05ff000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f90aac57000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f90aaa53000)
librt.so.1 => /lib64/librt.so.1 (0x00007f90aa84a000)
libc.so.6 => /lib64/libc.so.6 (0x00007f90aa494000)
/lib64/ld-linux-x86-64.so.2 (0x00007f90aae90000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f90aa290000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007f90aa08a000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f90a9e6e000)
After:
$ ldd systemd-timestamp
linux-vdso.so.1 => (0x00007fff3cbff000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5eaa1c3000)
librt.so.1 => /lib64/librt.so.1 (0x00007f5ea9fbb000)
libc.so.6 => /lib64/libc.so.6 (0x00007f5ea9c04000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5eaa3fc000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f5ea9a00000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5ea97e4000)
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