X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=doc%2Fman%2Flttng-crash.1.txt;h=dd8c6c701761305fc0095f04ec11e2fa06854f07;hb=26f0c7794376456fcb5b13d4eae91c0ccf0dfe66;hp=f67a881353a7cf80e278214d7579d33a7274c1d4;hpb=32357a9aba8ff33b71b46ec05b285171b97b9e55;p=lttng-tools.git diff --git a/doc/man/lttng-crash.1.txt b/doc/man/lttng-crash.1.txt index f67a88135..dd8c6c701 100644 --- a/doc/man/lttng-crash.1.txt +++ b/doc/man/lttng-crash.1.txt @@ -1,50 +1,59 @@ lttng-crash(1) ============== -:revdate: 2 April 2020 +:revdate: 3 May 2021 NAME ---- -lttng-crash - Recover and view LTTng 2 trace buffers in the event of a crash +lttng-crash - Recover and read LTTng trace buffers in the event of a crash SYNOPSIS -------- [verse] -*lttng-crash* [option:--extract='PATH' | option:--viewer='VIEWER'] [option:-v | option:-vv | option:-vvv] +*lttng-crash* [option:--extract='DIR' | option:--viewer='READER'] [option:-verbose]... 'SHMDIR' DESCRIPTION ----------- -The https://lttng.org/[_Linux Trace Toolkit: next generation_] is an open -source software package used for correlated tracing of the Linux kernel, -user applications, and user libraries. +include::common-intro.txt[] -LTTng consists of Linux kernel modules (for Linux kernel tracing) and -dynamically loaded libraries (for user application and library tracing). +The `lttng-crash` command-line tool recovers LTTng trace buffers in the +event of a system crash. -The _`lttng-crash`_ command-line tool is used to recover and view -LTTng trace buffers in the event of a system crash. +`lttng-crash` reads files within the directory 'SHMDIR' and does one +of: + +Without the option:--extract option:: + Launches a trace reader (see the option:--viewer option) to view the + recovered traces. + +With the option:--extract='DIR' option:: + Extracts the files as uncorrupted LTTng traces to the 'DIR' + directory. + +'SHMDIR' is the directory specified as the argument of the +nloption:--shm-path option of the man:lttng-create(1) command used to +create the tracing session for which to recover the traces. OPTIONS ------- -option:-x 'PATH', option:--extract='PATH':: - Extract recovered traces to path 'PATH'; do not execute the trace - viewer. +option:-x 'DIR', option:--extract='DIR':: + Extract recovered traces to the directory 'DIR'; do :not: execute + any trace reader. option:-v, option:--verbose:: Increase verbosity. + -Three levels of verbosity are available, which are triggered by -appending additional `v` letters to the option -(that is, `-vv` and `-vvv`). - -option:-e 'VIEWER', option:--viewer='VIEWER':: - Use trace viewer 'VIEWER' to view the trace buffers. 'VIEWER' is the - absolute path to the viewer command to use, and it can contain - command arguments as well. The trace directory paths are passed to - the 'VIEWER' command as its last arguments. +Specify this option up to three times to get more levels of verbosity. + +option:-e 'READER', option:--viewer='READER':: + Use the trace reader 'READER' to read the trace buffers. ++ +'READER' is the absolute path to the reader command to use, and it can +contain command arguments as well. `lttng-crash` passes the trace +directory paths to the 'READER' command as its last arguments. + Without this option, `lttng crash` uses man:babeltrace2(1) if it's available. Otherwise, it tries to use man:babeltrace(1). @@ -52,11 +61,10 @@ available. Otherwise, it tries to use man:babeltrace(1). Program information ~~~~~~~~~~~~~~~~~~~ -option:-h, option:--help:: - Show help. +include::common-help-option.txt[] option:-V, option:--version:: - Show version. + Show version and quit. EXIT STATUS @@ -76,8 +84,6 @@ include::common-footer.txt[] SEE ALSO -------- +man:babeltrace2(1), man:lttng(1), -man:lttng-sessiond(8), -man:lttng-relayd(8), -man:lttng-ust(3), -man:babeltrace2(1) +man:lttng-create(1)