fidlcat [ <options> ] [ command [args] ]
fidlcat will run the specified command until it exits. It will intercept and
record all fidl calls invoked by the process. The command may be of the form
"run <component URL>", in which case the given component will be launched.
fidlcat will return the code 1 if its parameters are invalid.
fidlcat expects a debug agent to be running on the target device. It will
return the code 2 if it cannot connect to the debug agent.
选项：
--analytics-show
Show the opt-in/out status for collection of analytics and what we collect when opt-in.
--analytics=enable|disable
Enable or disable collection of analytics:
--analytics=enable Enable collection of analytics and save the
status in a configuration file.
--analytics=disable Disable collection of analytics and save the
status in a configuration file.
--build-id-dir=<path>
Adds the given directory to the symbol search path. Multiple
--build-id-dir switches can be passed to add multiple directories.
The directory must have the same structure as a .build-id directory,
that is, each symbol file lives at xx/yyyyyyyy.debug where xx is
the first two characters of the build ID and yyyyyyyy is the rest.
However, the name of the directory doesn't need to be .build-id.
--colors=\[never|auto|always]
For pretty print, use colors:
- never
- auto: only if running in a terminal (default value)
- always
--columns=<size>
For pretty print, width of the display. By default, on a terminal, use
the terminal width.
--compare=<path>
Compare output with the one stored in the given file
--connect
The host and port of the debug agent running on the target Fuchsia
instance, of the form \[<ipv6_addr>]:port.
--dump-messages
Always display the message binary dump even if we can decode the message.
By default the dump is only displayed if we can't decode the message.
--exclude-messages
A regular expression which selects the messages to not display.
If a message method name satisfy the regexp, the message is not displayed
(even if it satifies --messages).
This option can be specified multiple times.
Message filtering works on the method's fully qualified name.
--exclude-syscalls
A regular expression which selects the syscalls to not decode and display.
Can be passed multiple times.
To be displayed, a syscall must verify --syscalls and not verify
--exclude-syscalls.
To display all the syscalls but the zx_handle syscalls, use:
--syscalls=".*" --exclude-syscalls="zx_handle_.*"
--extra-component=<url|moniker>
Like "--remote-component" but for these components, monitoring starts only
when one of the "--remote-name" or "--remote-component" is launched. Also,
fidlcat stops when the last "--remote-name" or "--remote-component" stops,
even if some "--extra-component" are still running. You must specify at
least one filter with "--remote-name" or "--remote-component" if you use
this option.
--extra-name=<name>
Like "--remote-name" but for these processes, monitoring starts only when
one of the "--remote-name" or "--remote-component" is launched. Also,
fidlcat stops when the last "--remote-name" or "--remote-component" stops,
even if some "--extra-name" processes are still running. You must specify
at least one filter with "--remote-name" or "--remote-component" if you
use this option.
--fidl-ir-path=<path>|@argfile
Adds the given path as a repository for FIDL IR, in the form of .fidl.json
files. Passing a file adds the given file. Passing a directory adds all
of the .fidl.json files in that directory and any directory transitively
reachable from there. An argfile contains a newline-separated list of
.fidl.json files relative to the directory containing the argfile; passing
an argfile (starting with the "@" character) adds all files listed in that
argfile. This switch can be passed multiple times to add multiple
locations.
--format=<output>
This option must be used at most once.
The output format can be:
--format=pretty The session is pretty printed (with colors).
This is the default output is --with is not used.
--format=json The session is printed using a json format.
--format=textproto The session is printed using a text protobuf format.
--format=none Nothing is displayed on the standard output (this
option only makes sense when used with --to=<path> or
with --with). When there is no output, fidlcat is much
faster (this is better when you want to monitor real
time components). This is the default output is
--with is used.
--from=<source>
This option must be used at most once.
Source can be:
--from=device This is the default input. The input comes from the live
monitoring of one or several processes. At least one of
"--remote-pid", "--remote-name", "--component-url",
"--component-moniker", or "run" must be specified.
--from=dump The input comes from stdin which is the log output of one or
several programs. The lines in the log which dump syscalls
are decoded and replaced by the decoded version. All other
lines are unchanged.
--from=<path> The input comes from a previously recorded session (protobuf
format). Path gives the name of the file to read. If path is
"-" then the standard input is used.
--help
-h
Prints all command-line switches.
--ids-txt=<path>
Adds the given file to the symbol search path. Multiple --ids-txt
switches can be passed to add multiple files. The file, typically named
"ids.txt", serves as a mapping from build ID to symbol file path and
should contain multiple lines in the format of "<build ID> <file path>".
--log-file=<pathspec>
The name of a file to which the log should be written.
--messages
A regular expression which selects the messages to display.
To display a message, the method name must satisfy the regexp.
This option can be specified multiple times.
Message filtering works on the method's fully qualified name.
--quiet=<number or log level>
The log verbosity. Legal values are "info", "warning", "error", "fatal",
or a number, starting from 0. Extra verbosity comes with lower levels.
--remote-component=<url|moniker>
-c <url|moniker>
The URL or the moniker of a component for which we want to monitor.
All processes running in the component will be monitered.
Can be provided multiple times for multiple components.
--remote-name=<name>
-f <name>
The name of a process. Fidlcat will monitor all existing and future
processes whose names includes <name> (<name> is a substring of the
process name). Can be provided multiple times for multiple names.
For example:
--remote-name echo_server
--remote-name echo_client
--remote-pid=<koid>
The koid of the remote process. Can be passed multiple times.
--stack=<value>
The amount of stack frame to display:
- 0: no stack (default value)
- 1: call site (1 to 4 levels)
- 2: full stack frame (adds some overhead)
--stay-alive
Don't quit fidlcat when all the monitored processes have ended. This
allows to keep monitoring upcoming process. At the end you have to use
control-c to quit fidlcat. This is useful when you monitor a process and
restart this process.
--symbol-cache=<path>
Directory where we can keep a symbol cache. If a symbol server has been
specified, downloaded symbols will be stored in this directory. The
directory structure will be the same as a .build-id directory, and
symbols will be read from this location as though you had specified
"--build-id-dir=<path>".
--symbol-index=<path>
Populates --ids-txt and --build-id-dir using the given symbol-index file,
which defaults to ~/.fuchsia/debug/symbol-index. The file should be
created and maintained by the "symbol-index" host tool.
--symbol-path=<path>
-s <path>
Adds the given directory or file to the symbol search path. Multiple
-s switches can be passed to add multiple locations. When a directory
path is passed, the directory will be enumerated non-recursively to
index all ELF files. When a file is passed, it will be loaded as an ELF
file (if possible).
--symbol-server=<url>
Adds the given URL to symbol servers. Symbol servers host the debug
symbols for prebuilt binaries and dynamic libraries.
--syscalls
A regular expression which selects the syscalls to decode and display.
Can be passed multiple times.
By default, only zx_channel_.* syscalls are displayed.
To display all the syscalls, use: --syscalls=".*"
--thread
Only display the events for the specified thread.
This option can be specified multiple times to display several threads.
By default all the events are displayed.
--to=<path>
Save the session using protobuf in the specified file. All events are
saved including the messages which have been filtered out by --messages
or --exclude-messages.
--trigger
Start displaying messages and syscalls only when a message for which the
method name satisfies the filter is found.
This option can be specified multiple times.
Message filtering works on the method's fully qualified name.
--unix-connect=<filepath>
Attempts to connect to a debug_agent through a unix socket.
--verbose=<number or log level>
The log verbosity. Legal values are "info", "warning", "error", "fatal",
or a number, starting from 0. Extra verbosity comes with higher levels
--version
Prints the version.
--with-process-info
Display the process name, process id and thread id on each line.
These options can be used several times.
--with=summary
At the end of the session, a summary of the session is displayed on the
standard output.
--with=summary=<path>
Like --with=summary but the result is stored into the file specified by
<path>.
--with=top
At the end of the session, generate a view that groups the output by
process, protocol, and method. The groups are sorted by number of events,
so groups with more associated events are listed earlier.
--with=top=<path>
Like --with=top but the result is stored into the file specified by
<path>.
--with=group-by-thread
Like For each thread, display a short version of all the events.
--with=group-by-thread=<path>
Like --with=group-by-thread but the result is stored into the file
specified by <path>.