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For executables which take a verb, we should list the verbs first, and
then options which modify those verbs second. The general layout of
the man page is from general description to specific details, usually
Overview, Commands, Options, Return Value, Examples, References.
When emitting the calendarspec warning we want to see some color.
Follow-up for 04220fda5c.
Exceptions:
- systemctl, because it has a lot hand-crafted coloring
- tmpfiles, sysusers, stdio-bridge, etc, because they are also used in
services and I'm not sure if this wouldn't mess up something.
Let's be helpful to static analyzers which care about whether we
knowingly ignore return values. We do in these cases, since they are
usually part of error paths.
This splits out a bunch of functions from fileio.c that have to do with
temporary files. Simply to make the header files a bit shorter, and to
group things more nicely.
No code changes, just some rearranging of source files.
Similar to the previous commit: in many cases no further fd processing
needs to be done in forked of children before execve() or any of its
flavours are called. In those case we can use FORK_RLIMIT_NOFILE_SAFE
instead.
Ideally, coccinelle would strip unnecessary braces too. But I do not see any
option in coccinelle for this, so instead, I edited the patch text using
search&replace to remove the braces. Unfortunately this is not fully automatic,
in particular it didn't deal well with if-else-if-else blocks and ifdefs, so
there is an increased likelikehood be some bugs in such spots.
I also removed part of the patch that coccinelle generated for udev, where we
returns -1 for failure. This should be fixed independently.
$ valgrind --show-leak-kinds=all --leak-check=full build/coredumpctl dump --output /tmp/ff
...
==16431== HEAP SUMMARY:
==16431== in use at exit: 3,680 bytes in 13 blocks
==16431== total heap usage: 831 allocs, 818 frees, 197,776 bytes allocated
==16431==
==16431== 2 bytes in 1 blocks are still reachable in loss record 1 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x4C4D5AD: strdup (strdup.c:42)
==16431== by 0x49B2387: bus_message_parse_fields (bus-message.c:5300)
==16431== by 0x49A23AF: bus_message_from_malloc (bus-message.c:560)
==16431== by 0x49C459B: bus_socket_make_message (bus-socket.c:1099)
==16431== by 0x49C4C5B: bus_socket_read_message (bus-socket.c:1213)
==16431== by 0x49CE4CE: bus_read_message (sd-bus.c:1777)
==16431== by 0x49CFA2C: sd_bus_call (sd-bus.c:2176)
==16431== by 0x1105F3: check_units_active (coredumpctl.c:1029)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== 9 bytes in 1 blocks are still reachable in loss record 2 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x4939067: malloc_multiply (alloc-util.h:78)
==16431== by 0x493921D: hexmem (hexdecoct.c:62)
==16431== by 0x49C2B75: bus_socket_start_auth_client (bus-socket.c:626)
==16431== by 0x49C2D78: bus_socket_start_auth (bus-socket.c:665)
==16431== by 0x49C3B09: bus_socket_connect (bus-socket.c:915)
==16431== by 0x49CBB08: bus_start_address (sd-bus.c:1103)
==16431== by 0x49CBFEA: sd_bus_start (sd-bus.c:1187)
==16431== by 0x49CC452: sd_bus_open_system_with_description (sd-bus.c:1294)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431==
==16431== 9 bytes in 1 blocks are still reachable in loss record 3 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x4C4D5AD: strdup (strdup.c:42)
==16431== by 0x497364E: free_and_strdup (string-util.c:1013)
==16431== by 0x49C9FB1: hello_callback (sd-bus.c:547)
==16431== by 0x49D0A3A: process_reply (sd-bus.c:2498)
==16431== by 0x49D13E0: process_message (sd-bus.c:2677)
==16431== by 0x49D165F: process_running (sd-bus.c:2739)
==16431== by 0x49D20DD: bus_process_internal (sd-bus.c:2957)
==16431== by 0x49D21E8: sd_bus_process (sd-bus.c:2984)
==16431== by 0x49CF21E: bus_ensure_running (sd-bus.c:2053)
==16431== by 0x49CF51F: sd_bus_call (sd-bus.c:2095)
==16431== by 0x1105F3: check_units_active (coredumpctl.c:1029)
==16431==
==16431== 24 bytes in 1 blocks are still reachable in loss record 4 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x495CB0D: malloc_multiply (alloc-util.h:78)
==16431== by 0x495CB2A: prioq_new (prioq.c:35)
==16431== by 0x495CC02: prioq_ensure_allocated (prioq.c:60)
==16431== by 0x49CEF84: sd_bus_call_async (sd-bus.c:1995)
==16431== by 0x49CA0E6: bus_send_hello (sd-bus.c:581)
==16431== by 0x49CC019: sd_bus_start (sd-bus.c:1196)
==16431== by 0x49CC452: sd_bus_open_system_with_description (sd-bus.c:1294)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431==
==16431== 38 bytes in 1 blocks are still reachable in loss record 5 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x4C4D5AD: strdup (strdup.c:42)
==16431== by 0x497364E: free_and_strdup (string-util.c:1013)
==16431== by 0x49C7F97: sd_bus_set_address (sd-bus.c:269)
==16431== by 0x49CC314: bus_set_address_system (sd-bus.c:1262)
==16431== by 0x49CC3E0: sd_bus_open_system_with_description (sd-bus.c:1281)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== 64 bytes in 1 blocks are still reachable in loss record 6 of 13
==16431== at 0x4838748: malloc (vg_replace_malloc.c:298)
==16431== by 0x483AD63: realloc (vg_replace_malloc.c:826)
==16431== by 0x4902663: greedy_realloc (alloc-util.c:55)
==16431== by 0x49C7D7D: sd_bus_new (sd-bus.c:255)
==16431== by 0x49CC398: sd_bus_open_system_with_description (sd-bus.c:1271)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== 64 bytes in 1 blocks are still reachable in loss record 7 of 13
==16431== at 0x4838748: malloc (vg_replace_malloc.c:298)
==16431== by 0x483AD63: realloc (vg_replace_malloc.c:826)
==16431== by 0x4902663: greedy_realloc (alloc-util.c:55)
==16431== by 0x49CE54E: bus_rqueue_make_room (sd-bus.c:1786)
==16431== by 0x49C44FC: bus_socket_make_message (bus-socket.c:1087)
==16431== by 0x49C4C5B: bus_socket_read_message (bus-socket.c:1213)
==16431== by 0x49CE4CE: bus_read_message (sd-bus.c:1777)
==16431== by 0x49CE6AF: dispatch_rqueue (sd-bus.c:1814)
==16431== by 0x49D162E: process_running (sd-bus.c:2733)
==16431== by 0x49D20DD: bus_process_internal (sd-bus.c:2957)
==16431== by 0x49D21E8: sd_bus_process (sd-bus.c:2984)
==16431== by 0x49CF21E: bus_ensure_running (sd-bus.c:2053)
==16431==
==16431== 65 bytes in 1 blocks are still reachable in loss record 8 of 13
==16431== at 0x483AB1A: calloc (vg_replace_malloc.c:752)
==16431== by 0x496E5D6: getpeersec (socket-util.c:969)
==16431== by 0x49C291C: bus_get_peercred (bus-socket.c:594)
==16431== by 0x49C2CB2: bus_socket_start_auth (bus-socket.c:650)
==16431== by 0x49C3B09: bus_socket_connect (bus-socket.c:915)
==16431== by 0x49CBB08: bus_start_address (sd-bus.c:1103)
==16431== by 0x49CBFEA: sd_bus_start (sd-bus.c:1187)
==16431== by 0x49CC452: sd_bus_open_system_with_description (sd-bus.c:1294)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431==
==16431== 181 bytes in 1 blocks are still reachable in loss record 9 of 13
==16431== at 0x483AD19: realloc (vg_replace_malloc.c:826)
==16431== by 0x49C4791: bus_socket_read_message (bus-socket.c:1143)
==16431== by 0x49CE4CE: bus_read_message (sd-bus.c:1777)
==16431== by 0x49CFA2C: sd_bus_call (sd-bus.c:2176)
==16431== by 0x1105F3: check_units_active (coredumpctl.c:1029)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== 256 bytes in 1 blocks are still reachable in loss record 10 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x496E740: getpeergroups (socket-util.c:998)
==16431== by 0x49C29BD: bus_get_peercred (bus-socket.c:599)
==16431== by 0x49C2CB2: bus_socket_start_auth (bus-socket.c:650)
==16431== by 0x49C3B09: bus_socket_connect (bus-socket.c:915)
==16431== by 0x49CBB08: bus_start_address (sd-bus.c:1103)
==16431== by 0x49CBFEA: sd_bus_start (sd-bus.c:1187)
==16431== by 0x49CC452: sd_bus_open_system_with_description (sd-bus.c:1294)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431==
==16431== 256 bytes in 1 blocks are still reachable in loss record 11 of 13
==16431== at 0x4838748: malloc (vg_replace_malloc.c:298)
==16431== by 0x483AD63: realloc (vg_replace_malloc.c:826)
==16431== by 0x495D1A0: prioq_put (prioq.c:162)
==16431== by 0x49CF0EA: sd_bus_call_async (sd-bus.c:2023)
==16431== by 0x49CA0E6: bus_send_hello (sd-bus.c:581)
==16431== by 0x49CC019: sd_bus_start (sd-bus.c:1196)
==16431== by 0x49CC452: sd_bus_open_system_with_description (sd-bus.c:1294)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431==
==16431== 856 bytes in 1 blocks are still reachable in loss record 12 of 13
==16431== at 0x483AB1A: calloc (vg_replace_malloc.c:752)
==16431== by 0x49A1F33: bus_message_from_header (bus-message.c:458)
==16431== by 0x49A22B1: bus_message_from_malloc (bus-message.c:535)
==16431== by 0x49C459B: bus_socket_make_message (bus-socket.c:1099)
==16431== by 0x49C4C5B: bus_socket_read_message (bus-socket.c:1213)
==16431== by 0x49CE4CE: bus_read_message (sd-bus.c:1777)
==16431== by 0x49CFA2C: sd_bus_call (sd-bus.c:2176)
==16431== by 0x1105F3: check_units_active (coredumpctl.c:1029)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== 1,856 bytes in 1 blocks are still reachable in loss record 13 of 13
==16431== at 0x483880B: malloc (vg_replace_malloc.c:299)
==16431== by 0x49C6EDF: malloc_multiply (alloc-util.h:78)
==16431== by 0x49C7C81: sd_bus_new (sd-bus.c:235)
==16431== by 0x49CC398: sd_bus_open_system_with_description (sd-bus.c:1271)
==16431== by 0x49CC4C6: sd_bus_open_system (sd-bus.c:1303)
==16431== by 0x49D4424: bus_default (sd-bus.c:3655)
==16431== by 0x49D44BC: sd_bus_default_system (sd-bus.c:3668)
==16431== by 0x110444: check_units_active (coredumpctl.c:1007)
==16431== by 0x110998: run (coredumpctl.c:1087)
==16431== by 0x110A45: main (coredumpctl.c:1100)
==16431==
==16431== LEAK SUMMARY:
==16431== definitely lost: 0 bytes in 0 blocks
==16431== indirectly lost: 0 bytes in 0 blocks
==16431== possibly lost: 0 bytes in 0 blocks
==16431== still reachable: 3,680 bytes in 13 blocks
==16431== suppressed: 0 bytes in 0 blocks
==16431==
We want to propagate the return value from gdb, hence this commit makes
use of the liberalization of DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE()
in previous commit.
We would open the file very early, which is not nice, if we e.g. fail when
parsing later options. Let's do the usual thing and just open it just before
writing, and close immediately after writing.
Pretty much everything uses just the first argument, and this doesn't make this
common pattern more complicated, but makes it simpler to pass multiple options.
This makes use of rlimit_nofile_bump() in all tools that access the
journal. In some cases this replaces older code to achieve this, and
others we add it in where it was missing.
This is a bit like the info link in most of GNU's --help texts, but we
don't do info but man pages, and we make them properly clickable on
terminal supporting that, because awesome.
I think it's generally advisable to link up our (brief) --help texts and
our (more comprehensive) man pages a bit, so this should be an easy and
straight-forward way to do it.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
This macro will read a pointer of any type, return it, and set the
pointer to NULL. This is useful as an explicit concept of passing
ownership of a memory area between pointers.
This takes inspiration from Rust:
https://doc.rust-lang.org/std/option/enum.Option.html#method.take
and was suggested by Alan Jenkins (@sourcejedi).
It drops ~160 lines of code from our codebase, which makes me like it.
Also, I think it clarifies passing of ownership, and thus helps
readability a bit (at least for the initiated who know the new macro)
Even if pager_open() fails, in general, we should continue the operations.
All erroneous cases in pager_open() show log message in the function.
So, it is not necessary to check the returned value.
In a number of occasions we use FORK_CLOSE_ALL_FDS when forking off a
child, since we don't want to pass fds to the processes spawned (either
because we later want to execve() some other process there, or because
our child might hang around for longer than expected, in which case it
shouldn't keep our fd pinned). This also closes any logging fds, and
thus means logging is turned off in the child. If we want to do proper
logging, explicitly reopen the logs hence in the child at the right
time.
This is particularly crucial in the umount/remount children we fork off
the shutdown binary, as otherwise the children can't log, which is
why #8155 is harder to debug than necessary: the log messages we
generate about failing mount() system calls aren't actually visible on
screen, as they done in the child processes where the log fds are
closed.
When running journalctl --user-unit=foo as an unprivileged user we could get
the usual hint:
Hint: You are currently not seeing messages from the system and other users.
Users in groups 'adm', 'systemd-journal', 'wheel' can see all messages.
...
But with --user-unit our filter is:
(((_UID=0 OR _UID=1000) AND OBJECT_SYSTEMD_USER_UNIT=foo.service) OR
((_UID=0 OR _UID=1000) AND COREDUMP_USER_UNIT=foo.service) OR
(_UID=1000 AND USER_UNIT=foo.service) OR
(_UID=1000 AND _SYSTEMD_USER_UNIT=foo.service))
so we would never see messages from other users.
We could still see messages from the system. In fact, on my machine the
only messages with OBJECT_SYSTEMD_USER_UNIT= are from the system:
journalctl $(journalctl -F OBJECT_SYSTEMD_USER_UNIT|sed 's/.*/OBJECT_SYSTEMD_USER_UNIT=\0/')
Thus, a more correct hint is that we cannot see messages from the system.
Make it so.
Fixes#7887.
Using wait_for_terminate_and_check() instead of wait_for_terminate()
let's us simplify, shorten and unify the return value checking and
logging of waitid(). Hence, let's use it all over the place.
This adds a new safe_fork() wrapper around fork() and makes use of it
everywhere. The new wrapper does a couple of things we previously did
manually and separately in a safer, more correct and automatic way:
1. Optionally resets signal handlers/mask in the child
2. Sets a name on all processes we fork off right after forking off (and
the patch assigns useful names for all processes we fork off now,
following a systematic naming scheme: always enclosed in () – in order
to indicate that these are not proper, exec()ed processes, but only
forked off children, and if the process is long-running with only our
own code, without execve()'ing something else, it gets am "sd-" prefix.)
3. Optionally closes all file descriptors in the child
4. Optionally sets a PR_SET_DEATHSIG to SIGTERM in the child, in a safe
way so that the parent dying before this happens being handled
safely.
5. Optionally reopens the logs
6. Optionally connects stdin/stdout/stderr to /dev/null
7. Debug logs about the forked off processes.
This makes things a bit easier to read I think, and also makes sure we
always use the _unlikely_ wrapper around it, which so far we used
sometimes and other times we didn't. Let's clean that up.
The advantage is that is the name is mispellt, cpp will warn us.
$ git grep -Ee "conf.set\('(HAVE|ENABLE)_" -l|xargs sed -r -i "s/conf.set\('(HAVE|ENABLE)_/conf.set10('\1_/"
$ git grep -Ee '#ifn?def (HAVE|ENABLE)' -l|xargs sed -r -i 's/#ifdef (HAVE|ENABLE)/#if \1/; s/#ifndef (HAVE|ENABLE)/#if ! \1/;'
$ git grep -Ee 'if.*defined\(HAVE' -l|xargs sed -i -r 's/defined\((HAVE_[A-Z0-9_]*)\)/\1/g'
$ git grep -Ee 'if.*defined\(ENABLE' -l|xargs sed -i -r 's/defined\((ENABLE_[A-Z0-9_]*)\)/\1/g'
+ manual changes to meson.build
squash! build-sys: use #if Y instead of #ifdef Y everywhere
v2:
- fix incorrect setting of HAVE_LIBIDN2
I think it would be a good idea to move such fixed, picked values out of
the main sources into the head of a file, to make sure they are
ultimately tunables.
Given that this is a field primarily processed by computers, and not so
much by humans, assign "1" instead of "yes". Also, use parse_boolean()
as we usually do for parsing it again.
This makes things more alike udev options (as one example), such as
SYSTEMD_READY where we also spit out "1" and "0", and parse with
parse_boolean().
