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authorSverker Eriksson <[email protected]>2016-05-17 16:58:03 +0200
committerSverker Eriksson <[email protected]>2016-05-17 16:58:03 +0200
commit93effe30867d50b68504743cd5f0c851e623932c (patch)
tree4ac84581bf7d056ef797d87d9d359333ecb7f408 /lib/runtime_tools/doc
parent0d6b5426898f7dd2fb099809cb171b2678a08d59 (diff)
parent6083b53606707524dbd7780175588530e37f186f (diff)
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Merge branch 'sverker/trace-send-receive-matchspec/OTP-13507'
Second merge of this branch to master with some more docs
Diffstat (limited to 'lib/runtime_tools/doc')
-rw-r--r--lib/runtime_tools/doc/src/dbg.xml60
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/runtime_tools/doc/src/dbg.xml b/lib/runtime_tools/doc/src/dbg.xml
index 103b8b52e9..49b11ddc3c 100644
--- a/lib/runtime_tools/doc/src/dbg.xml
+++ b/lib/runtime_tools/doc/src/dbg.xml
@@ -439,6 +439,50 @@ Error: fun containing local erlang function calls ('is_atomm' called in guard)\
global calls (and functions).</p>
</desc>
</func>
+
+
+ <func>
+ <name>tpe(Event, MatchSpec) -> {ok, MatchDesc} | {error, term()}</name>
+ <fsummary>Set pattern for traced event</fsummary>
+ <type>
+ <v>Event = send | 'receive'</v>
+ <v>MatchSpec = integer() | Built-inAlias | [] | match_spec()</v>
+ <v>Built-inAlias = x | c | cx</v>
+ <v>MatchDesc = [MatchInfo]</v>
+ <v>MatchInfo = {saved, integer()} | MatchNum</v>
+ <v>MatchNum = {matched, node(), 1} | {matched, node(), 0, RPCError}</v>
+ </type>
+ <desc>
+ <p>This function associates a match specification with trace event
+ <c>send</c> or <c>'receive'</c>. By default all executed <c>send</c>
+ and <c>'receive'</c> events are traced if enabled for a process.
+ A match specification can be used to filter traced events
+ based on sender, receiver and/or message content.</p>
+ <p>For a description of the <c>match_spec()</c> syntax,
+ please turn to the <em>User's guide</em> part of the online
+ documentation for the runtime system (<em>erts</em>). The
+ chapter <seealso marker="erts:match_spec"><em>Match Specifications in Erlang</em></seealso>
+ explains the general match specification "language".</p>
+ <p>For <c>send</c>, the matching is done on the list <c>[Receiver, Msg]</c>.
+ <c>Receiver</c> is the process or port identity of the receiver and
+ <c>Msg</c> is the message term. The pid of the sending process can be
+ accessed with the guard function <c>self/0</c>.</p>
+ <p>For <c>'receive'</c>, the matching is done on the list <c>[Node, Sender, Msg]</c>.
+ <c>Node</c> is the node name of the sender. <c>Sender</c> is the
+ process or port identity of the sender, or the atom
+ <c>undefined</c> if the sender is not known (which may
+ be the case for remote senders). <c>Msg</c> is the
+ message term. The pid of the receiving process can be
+ accessed with the guard function <c>self/0</c>.</p>
+ <p>All nodes added with <seealso marker="#n-1"><c>n/1</c></seealso> or
+ <seealso marker="#tracer-3"><c>tracer/3</c></seealso> will
+ be affected by this call.</p>
+ <p>The return value is the same as for
+ <seealso marker="#tp-2"><c>tp/2</c></seealso>. The number of matched
+ events are never larger than 1 as <c>tpe/2</c> does not
+ accept any form of wildcards for argument <c>Event</c>.</p>
+ </desc>
+ </func>
<func>
<name>ctp()</name>
<fsummary>Clear call trace pattern for the specified functions</fsummary>
@@ -563,6 +607,22 @@ Error: fun containing local erlang function calls ('is_atomm' called in guard)\
</desc>
</func>
<func>
+ <name>ctpe(Event) -> {ok, MatchDesc} | {error, term()}</name>
+ <fsummary>Clear trace pattern for the specified event</fsummary>
+ <type>
+ <v>Event = send | 'receive'</v>
+ <v>MatchDesc = [MatchNum]</v>
+ <v>MatchNum = {matched, node(), 1} | {matched, node(), 0, RPCError}</v>
+ </type>
+ <desc>
+ <p>This function clears match specifications for the specified
+ trace event (<c>send</c> or <c>'receive'</c>). It will revert back
+ to the default behavior of tracing all triggered events.</p>
+ <p>The return value follow the same style as for
+ <seealso marker="#ctp-1"><c>ctp/1</c></seealso>.</p>
+ </desc>
+ </func>
+ <func>
<name>ltp() -> ok</name>
<fsummary>List saved and built-in match specifications on the console.</fsummary>
<desc>