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authorMark Salyzyn2016-09-12 16:51:54 -0500
committerMark Salyzyn2017-02-02 16:24:18 -0600
commit61e9ce6709a12cf39a9471476da3d50339efe466 (patch)
treec461a90ad53a38bf2baab5a3d9ec922aded478ea /logd/logtagd.rc
parent3dfe40129657165f4cfe6c6cf0a5b6c8e8e6d4da (diff)
logd: add getEventTag command and service
Will register a new event tag by name and format, and return an event-log-tags format response with the newly allocated tag. If format is not specified, then nothing will be recorded, but a pre-existing named entry will be listed. If name and format are not specified, list all dynamic entries. If name=* list all event log tag entries. Stickiness through logd crash will be managed with the tmpfs file /dev/event-log-tags and through a reboot with add_tag entries in the pmsg last logcat event log. On debug builds we retain a /data/misc/logd/event-log-tags file that aids stickiness and that can be picked up by the bugreport. If we detect truncation damage to /dev/event-log-tags, or to /data/misc/logd/event-log-tags, rebuild file with a new first line signature incorporating the time so mmap'd readers of the file can detect the possible change in shape and order. Manual testing: Make sure nc (netcat) is built for the target platform on the host: $ m nc Then the following can be used to issue a request on the platform: $ echo -n 'getEventTag name=<name> format="<format>"\0EXIT\0' | > nc -U /dev/socket/logd Test: gTest logd-unit-test --gtest_filter=getEventTag* Bug: 31456426 Change-Id: I5dacc5f84a24d52dae09cca5ee1a3a9f9207f06d
Diffstat (limited to 'logd/logtagd.rc')
1 files changed, 9 insertions, 0 deletions
diff --git a/logd/logtagd.rc b/logd/logtagd.rc
new file mode 100644
index 000000000..46aa8c1d9
--- /dev/null
+++ b/logd/logtagd.rc
@@ -0,0 +1,9 @@
2# logtagd event log tag service (debug only)
4on post-fs-data
5 mkdir /data/misc/logd 0700 logd log
6 write /data/misc/logd/event-log-tags ""
7 chown logd log /data/misc/logd/event-log-tags
8 chmod 0600 /data/misc/logd/event-log-tags
9 restorecon /data/misc/logd/event-log-tags