diff options
Diffstat (limited to 'erts/doc/src/erlang.xml')
| -rw-r--r-- | erts/doc/src/erlang.xml | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index e4f245975b..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> |