diff options
Diffstat (limited to 'erts/doc/src/erlang.xml')
| -rw-r--r-- | erts/doc/src/erlang.xml | 40 |
1 files changed, 14 insertions, 26 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 0963904b83..248b755969 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -2863,6 +2863,10 @@ os_prompt% </pre> <p>It can only be used to check the local time of day if the time-zone info of the underlying operating system is properly configured.</p> + <p>If you do not need the return value to be unique and + monotonically increasing, use + <seealso marker="kernel:os#timestamp/0">os:timestamp/0</seealso> + instead to avoid some overhead.</p> </desc> </func> <func> @@ -3035,8 +3039,11 @@ os_prompt% </pre> port process. Both <c>Name</c> and <c>Val</c> must be strings. The one exception is <c>Val</c> being the atom <c>false</c> (in analogy with <c>os:getenv/1</c>), which - removes the environment variable. Not available on - VxWorks.</p> + removes the environment variable.</p> + <p>If Unicode filename encoding is in effect (see the <seealso + marker="erts:erl#file_name_encoding">erl manual + page</seealso>), the strings (both <c>Name</c> and + <c>Value</c>) may contain characters with codepoints > 255.</p> </item> <tag><c>{args, [ string() ]}</c></tag> <item> @@ -3573,6 +3580,10 @@ os_prompt% </pre> <p><c>Bytes</c> is the total number of bytes written to the port.</p> </item> + <tag><c>{os_pid, Integer | undefined}</c></tag> + <item> + <p><c>Integer</c> is the process identifier (or equivalent) of an OS process created with <c>open_port({spawn | spawn_executable, Command}, Options)</c>. If the port is not the result of spawning an OS process, the value is <c>undefined</c>.</p> + </item> </taglist> <p>Failure: <c>badarg</c> if <c>Port</c> is not a local port.</p> </desc> @@ -4005,14 +4016,6 @@ os_prompt% </pre> <p><c>Size</c> is the size in bytes of the process. This includes call stack, heap and internal structures.</p> </item> - <tag><c>{message_binary, BinInfo}</c></tag> - <item> - <p><c>BinInfo</c> is a list containing miscellaneous information - about binaries currently being referred to by the message - area. This <c>InfoTuple</c> is only valid on an emulator - using the hybrid heap type. This <c>InfoTuple</c> may be - changed or removed without prior notice.</p> - </item> <tag><c>{message_queue_len, MessageQueueLen}</c></tag> <item> <p><c>MessageQueueLen</c> is the number of messages @@ -5799,10 +5802,6 @@ ok can spawn a process that does not use the default settings.</p> </item> - <tag><c>global_heaps_size</c></tag> - <item> - <p>Returns the current size of the shared (global) heap.</p> - </item> <tag><c>heap_sizes</c></tag> <item> <p>Returns a list of integers representing valid heap sizes @@ -5812,7 +5811,7 @@ ok <tag><c>heap_type</c></tag> <item> <p>Returns the heap type used by the current emulator. - Currently the following heap types exist:</p> + Currently only the following heap type exists:</p> <taglist> <tag><c>private</c></tag> <item> @@ -5821,17 +5820,6 @@ ok allowed. Messages passed between processes are copied between heaps.</p> </item> - <tag><c>shared</c></tag> - <item> - <p>One heap for use by all processes. Messages passed - between processes are passed by reference.</p> - </item> - <tag><c>hybrid</c></tag> - <item> - <p>A hybrid of the <c>private</c> and <c>shared</c> heap - types. A shared heap as well as private heaps are - used.</p> - </item> </taglist> </item> <tag><c>info</c></tag> |