Merge branch 'sverker/add-since-doc/OTP-15460' into maint

* sverker/add-since-doc/OTP-15460:
  Fill in since for multi-clause functions in erlang.erl
  Fix since attribute for troubled function docs
  Add empty 'since' attribute for old modules and functions
  Add since attribute to dtd
  Add "since" attributes in xml for new functions and modules
  erl_docgen: Generate "since" OTP version in html
  erl_interface: Fix doc for return type 'struct hostent'

1 files changed, 19 insertions, 19 deletions

diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml
index c95e615c6b..0500e4cfb3 100644
--- a/lib/kernel/doc/src/os.xml
+++ b/lib/kernel/doc/src/os.xml
@@ -28,7 +28,7 @@
     <date></date>
     <rev></rev>
   </header>
-  <module>os</module>
+  <module since="">os</module>
   <modulesummary>Operating system-specific functions.</modulesummary>
   <description>
     <p>The functions in this module are operating system-specific.
@@ -134,8 +134,8 @@
 
   <funcs>
     <func>
-      <name name="cmd" arity="1"/>
-      <name name="cmd" arity="2"/>
+      <name name="cmd" arity="1" since=""/>
+      <name name="cmd" arity="2" since="OTP 20.2.3"/>
       <fsummary>Execute a command in a shell of the target OS.</fsummary>
       <desc>
         <p>Executes <c><anno>Command</anno></c> in a command shell of the
@@ -173,8 +173,8 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="find_executable" arity="1"/>
-      <name name="find_executable" arity="2"/>
+      <name name="find_executable" arity="1" since=""/>
+      <name name="find_executable" arity="2" since=""/>
       <fsummary>Absolute filename of a program.</fsummary>
       <desc>
         <p>These two functions look up an executable program, with the
@@ -190,7 +190,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="getenv" arity="0"/>
+      <name name="getenv" arity="0" since=""/>
       <fsummary>List all environment variables.</fsummary>
       <desc>
         <p>Returns a list of all environment variables.
@@ -205,7 +205,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="getenv" arity="1"/>
+      <name name="getenv" arity="1" since=""/>
       <fsummary>Get the value of an environment variable.</fsummary>
       <desc>
         <p>Returns the <c><anno>Value</anno></c> of the environment variable
@@ -220,7 +220,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="getenv" arity="2"/>
+      <name name="getenv" arity="2" since="OTP 18.0"/>
       <fsummary>Get the value of an environment variable.</fsummary>
       <desc>
         <p>Returns the <c><anno>Value</anno></c> of the environment variable
@@ -235,7 +235,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="getpid" arity="0"/>
+      <name name="getpid" arity="0" since=""/>
       <fsummary>Return the process identifier of the emulator
         process.</fsummary>
       <desc>
@@ -251,7 +251,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="putenv" arity="2"/>
+      <name name="putenv" arity="2" since=""/>
       <fsummary>Set a new value for an environment variable.</fsummary>
       <desc>
         <p>Sets a new <c><anno>Value</anno></c> for environment variable
@@ -277,7 +277,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="set_signal" arity="2"/>
+      <name name="set_signal" arity="2" since="OTP 20.0"/>
       <fsummary>Enables or disables handling of OS signals.</fsummary>
       <desc>
           <p>Enables or disables OS signals.</p>
@@ -304,7 +304,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="system_time" arity="0"/>
+      <name name="system_time" arity="0" since="OTP 18.0"/>
       <fsummary>Current OS system time.</fsummary>
       <desc>
 	<p>Returns the current
@@ -317,7 +317,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="system_time" arity="1"/>
+      <name name="system_time" arity="1" since="OTP 18.0"/>
       <fsummary>Current OS system time.</fsummary>
       <desc>
 	<p>Returns the current
@@ -332,7 +332,7 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
     </func>
 
     <func>
-      <name name="timestamp" arity="0"/>
+      <name name="timestamp" arity="0" since=""/>
       <fsummary>Current OS system time on the <c>erlang:timestamp/0</c> format.</fsummary>
       <type_desc variable="Timestamp">Timestamp = {MegaSecs, Secs, MicroSecs}</type_desc>
       <desc>
@@ -373,7 +373,7 @@ calendar:now_to_universal_time(TS),
     </func>
 
     <func>
-      <name name="perf_counter" arity="0"/>
+      <name name="perf_counter" arity="0" since="OTP 19.0"/>
       <fsummary>Returns a performance counter</fsummary>
       <desc>
         <p>Returns the current performance counter value in <c>perf_counter</c>
@@ -383,7 +383,7 @@ calendar:now_to_universal_time(TS),
       </desc>
     </func>
     <func>
-      <name name="perf_counter" arity="1"/>
+      <name name="perf_counter" arity="1" since="OTP 19.0"/>
       <fsummary>Returns a performance counter</fsummary>
       <desc><p>Returns a performance counter that can be used as a very fast and
       high resolution timestamp. This counter is read directly from the hardware or operating
@@ -397,7 +397,7 @@ calendar:now_to_universal_time(TS),
       </desc>
     </func>
     <func>
-      <name name="type" arity="0"/>
+      <name name="type" arity="0" since=""/>
       <fsummary>Return the OS family and, in some cases, the OS name of the
         current OS.</fsummary>
       <desc>
@@ -417,7 +417,7 @@ calendar:now_to_universal_time(TS),
     </func>
 
     <func>
-      <name name="unsetenv" arity="1"/>
+      <name name="unsetenv" arity="1" since="OTP R16B03"/>
       <fsummary>Delete an environment variable.</fsummary>
       <desc>
 	<p>Deletes the environment variable <c><anno>VarName</anno></c>.</p>
@@ -429,7 +429,7 @@ calendar:now_to_universal_time(TS),
     </func>
 
     <func>
-      <name name="version" arity="0"/>
+      <name name="version" arity="0" since=""/>
       <fsummary>Return the OS versions.</fsummary>
       <desc>
         <p>Returns the OS version.