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-rw-r--r--erts/doc/src/erlang.xml30
1 files changed, 23 insertions, 7 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 483d81cfb6..6daa4b68a8 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -1252,10 +1252,11 @@ true
<fsummary>Check if a function is exported and loaded</fsummary>
<desc>
<p>Returns <c>true</c> if the module <c><anno>Module</anno></c> is loaded
- and contains an exported function <c><anno>Function</anno>/<anno>Arity</anno></c>;
- otherwise <c>false</c>.</p>
- <p>Returns <c>false</c> for any BIF (functions implemented in C
- rather than in Erlang).</p>
+ and contains an exported function <c><anno>Function</anno>/<anno>Arity</anno></c>,
+ or if there is a BIF (a built-in function implemented in C)
+ with the given name; otherwise returns <c>false</c>.</p>
+ <note><p>This function used to return false for built-in
+ functions before the 18.0 release.</p></note>
</desc>
</func>
<func>
@@ -1356,7 +1357,7 @@ true
<name name="get" arity="1"/>
<fsummary>Return a value from the process dictionary</fsummary>
<desc>
- <p>Returns the value <c><anno>Val</anno></c>associated with <c><anno>Key</anno></c> in
+ <p>Returns the value <c><anno>Val</anno></c> associated with <c><anno>Key</anno></c> in
the process dictionary, or <c>undefined</c> if <c><anno>Key</anno></c>
does not exist.</p>
<pre>
@@ -1376,6 +1377,19 @@ true
</desc>
</func>
<func>
+ <name name="get_keys" arity="0"/>
+ <fsummary>Return a list of all keys from the process dictionary</fsummary>
+ <desc>
+ <p>Returns a list of keys all keys present in the process dictionary.</p>
+ <pre>
+> <input>put(dog, {animal,1}),</input>
+<input>put(cow, {animal,2}),</input>
+<input>put(lamb, {animal,3}),</input>
+<input>get_keys().</input>
+[dog,cow,lamb]</pre>
+ </desc>
+ </func>
+ <func>
<name name="get_keys" arity="1"/>
<fsummary>Return a list of keys from the process dictionary</fsummary>
<desc>
@@ -2840,7 +2854,7 @@ os_prompt% </pre>
raised. The error reason may differ between operating
systems. Typically the error <c>enoent</c> is raised
when one tries to run a program that is not found and
- <c>eaccess</c> is raised when the given file is not
+ <c>eacces</c> is raised when the given file is not
executable.</p>
</item>
<tag><c>{fd, <anno>In</anno>, <anno>Out</anno>}</c></tag>
@@ -6815,7 +6829,9 @@ ok
only allowed with <c>PidSpec==all</c>. If the host
machine operating system does not support high resolution
CPU time measurements, <c>trace/3</c> exits with
- <c>badarg</c>.</p>
+ <c>badarg</c>. Note that most operating systems do
+ not synchronize this value across cores, so be prepared
+ that time might seem to go backwards when using this option.</p>
</item>
<tag><c>arity</c></tag>
<item>