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authorGravatar Peter Korsgaard <jacmet@sunsite.dk>2013-01-06 00:07:19 +0100
committerGravatar Mike Frysinger <vapier@gentoo.org>2013-01-06 13:30:50 -0500
commitcd776cf96735760311560495f3f0078ae72e98a0 (patch)
tree21aa8361ce965d00921923430f4773fcc060e6cd /util-linux/volume_id/hfs.c
parentd189b598b449f3a258354133180e7b770c04526c (diff)
downloadbusybox-cd776cf96735760311560495f3f0078ae72e98a0.tar.gz
busybox-cd776cf96735760311560495f3f0078ae72e98a0.tar.bz2
syslogd: add option to log to Linux kernel printk buffer
Why invent our own shared memory circular buffer when the kernel has a perfectly fine one already? This can be used as a smaller/simpler alternative to the syslogd IPC support (as IPC shmem/klogd/logread aren't needed), while also allowing centralised logging of everything (kernel messages, userspace bootup and syslog) when used together with ttyprintk. Notice that kernel 3.5+ is needed to store syslog facility in printk buffer, otherwise only the priority is stored. bloat-o-meter compared to IPC+klogd+logread: function old new delta get_linux_version_code - 84 +84 lbb_prepare 25 90 +65 applet_nameofs 6 - -6 static.stdout@@GLIBC_2 8 - -8 applet_names 23 9 -14 bb_msg_standard_output 16 - -16 init_sem 18 - -18 xatoull_range 19 - -19 overlapping_strcpy 21 - -21 init_data 56 32 -24 applet_main 24 - -24 main 124 99 -25 full_write2_str 26 - -26 error_exit 26 - -26 bb_basename 30 - -30 sem_up 32 - -32 interrupted 35 - -35 fflush_stdout_and_exit 38 - -38 bb_banner 46 - -46 find_applet_by_name 59 - -59 bb_signals_recursive_norestart 90 - -90 run_applet_no_and_exit 104 - -104 timestamp_and_log 651 523 -128 syslogd_main 798 581 -217 xstrtoull_range_sfx 267 - -267 run_applet_and_exit 432 - -432 klogd_main 490 - -490 logread_main 508 - -508 .rodata 1870 937 -933 bb_common_bufsiz1 8193 - -8193 ------------------------------------------------------------------------------ (add/remove: 2/26 grow/shrink: 1/6 up/down: 149/-11829) Total: -11680 bytes Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'util-linux/volume_id/hfs.c')
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