diff options
Diffstat (limited to 'lib/kernel/doc/src/erl_ddll.xml')
| -rw-r--r-- | lib/kernel/doc/src/erl_ddll.xml | 129 |
1 files changed, 46 insertions, 83 deletions
diff --git a/lib/kernel/doc/src/erl_ddll.xml b/lib/kernel/doc/src/erl_ddll.xml index 9a62b45d63..f9514dda2f 100644 --- a/lib/kernel/doc/src/erl_ddll.xml +++ b/lib/kernel/doc/src/erl_ddll.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1997</year><year>2010</year> + <year>1997</year><year>2011</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -172,6 +172,14 @@ </item> </taglist> </description> + <datatypes> + <datatype> + <name name="driver"/> + </datatype> + <datatype> + <name name="path"/> + </datatype> + </datatypes> <funcs> <func> <name>demonitor(MonitorRef) -> ok</name> @@ -189,37 +197,21 @@ </desc> </func> <func> - <name>info() -> AllInfoList</name> + <name name="info" arity="0"/> <fsummary>Retrieve information about all drivers</fsummary> - <type> - <v>AllInfoList = [ DriverInfo ]</v> - <v>DriverInfo = {DriverName, InfoList}</v> - <v>DriverName = string()</v> - <v>InfoList = [ InfoItem ]</v> - <v>InfoItem = {Tag, Value}</v> - <v>Tag = atom()</v> - <v>Value = term()</v> - </type> <desc> - <p>Returns a list of tuples <c>{DriverName, InfoList}</c>, where - <c>InfoList</c> is the result of calling <seealso marker="#info/1">info/1</seealso> for that - <c>DriverName</c>. Only dynamically linked in drivers are + <p>Returns a list of tuples <c>{<anno>DriverName</anno>, <anno>InfoList</anno>}</c>, where + <c><anno>InfoList</anno></c> is the result of calling <seealso marker="#info/1">info/1</seealso> for that + <c><anno>DriverName</anno></c>. Only dynamically linked in drivers are included in the list.</p> </desc> </func> <func> - <name>info(Name) -> InfoList</name> + <name name="info" arity="1"/> <fsummary>Retrieve information about one driver</fsummary> - <type> - <v>Name = string() | atom()</v> - <v>InfoList = [ InfoItem ]</v> - <v>InfoItem = {Tag, Value}</v> - <v>Tag = atom()</v> - <v>Value = term()</v> - </type> <desc> - <p>Returns a list of tuples <c>{Tag, Value}</c>, where - <c>Tag</c> is the information item and <c>Value</c> is the result + <p>Returns a list of tuples <c>{<anno>Tag</anno>, <anno>Value</anno>}</c>, where + <c><anno>Tag</anno></c> is the information item and <c><anno>Value</anno></c> is the result of calling <seealso marker="#info/2">info/2</seealso> with this driver name and this tag. The result being a tuple list containing all information available about a driver. </p> @@ -305,22 +297,18 @@ </desc> </func> <func> - <name>load(Path, Name) -> ok | {error, ErrorDesc}</name> + <name name="load" arity="2"/> <fsummary>Load a driver</fsummary> - <type> - <v>Path = Name = string() | atom()</v> - <v>ErrorDesc = term()</v> - </type> <desc> - <p>Loads and links the dynamic driver <c>Name</c>. <c>Path</c> + <p>Loads and links the dynamic driver <c><anno>Name</anno></c>. <c><anno>Path</anno></c> is a file path to the directory containing the driver. - <c>Name</c> must be a sharable object/dynamic library. Two - drivers with different <c>Path</c> parameters cannot be - loaded under the same name. The <c>Name</c> is a string or + <c><anno>Name</anno></c> must be a sharable object/dynamic library. Two + drivers with different <c><anno>Path</anno></c> parameters cannot be + loaded under the same name. The <c><anno>Name</anno></c> is a string or atom containing at least one character.</p> - <p>The <c>Name</c> given should correspond to the filename + <p>The <c><anno>Name</anno></c> given should correspond to the filename of the actual dynamically loadable object file residing in - the directory given as <c>Path</c>, but <em>without</em> the + the directory given as <c><anno>Path</anno></c>, but <em>without</em> the extension (i.e. <c>.so</c>). The driver name provided in the driver initialization routine must correspond with the filename, in much the same way as erlang module names @@ -328,14 +316,14 @@ <p>If the driver has been previously unloaded, but is still present due to open ports against it, a call to <c>load/2</c> will stop the unloading and keep the driver - (as long as the <c>Path</c> is the same) and <c>ok</c> is + (as long as the <c><anno>Path</anno></c> is the same) and <c>ok</c> is returned. If one actually wants the object code to be reloaded, one uses <seealso marker="#reload/2">reload/2</seealso> or the low-level interface <seealso marker="#try_load/3">try_load/3</seealso> instead. Please refer to the description of <seealso marker="#scenarios">different scenarios</seealso> for loading/unloading in the introduction.</p> <p>If more than one process tries to load an already loaded - driver withe the same <c>Path</c>, or if the same process + driver withe the same <c><anno>Path</anno></c>, or if the same process tries to load it several times, the function will return <c>ok</c>. The emulator will keep track of the <c>load/2</c> calls, so that a corresponding number of @@ -349,16 +337,16 @@ several drivers with the same name but with different <c>Path</c> parameters.</p> <note> - <p>Note especially that the <c>Path</c> is interpreted + <p>Note especially that the <c><anno>Path</anno></c> is interpreted literally, so that all loaders of the same driver needs to - give the same <em>literal</em><c>Path</c> string, even + give the same <em>literal</em><c><anno>Path</anno></c> string, even though different paths might point out the same directory in the filesystem (due to use of relative paths and links).</p> </note> <p>On success, the function returns <c>ok</c>. On - failure, the return value is <c>{error,ErrorDesc}</c>, - where <c>ErrorDesc</c> is an opaque term to be + failure, the return value is <c>{error,<anno>ErrorDesc</anno>}</c>, + where <c><anno>ErrorDesc</anno></c> is an opaque term to be translated into human readable form by the <seealso marker="#format_error/1">format_error/1</seealso> function.</p> <p>For more control over the error handling, again use the @@ -369,20 +357,16 @@ </desc> </func> <func> - <name>load_driver(Path, Name) -> ok | {error, ErrorDesc}</name> + <name name="load_driver" arity="2"/> <fsummary>Load a driver</fsummary> - <type> - <v>Path = Name = string() | atom()</v> - <v>ErrorDesc = term()</v> - </type> <desc> <p>Works essentially as <c>load/2</c>, but will load the driver - with options other options. All ports that are using the + with other options. All ports that are using the driver will get killed with the reason <c>driver_unloaded</c> when the driver is to be unloaded.</p> <p>The number of loads and unloads by different <seealso marker="#users">users</seealso> influence the actual loading and unloading of a driver file. The port killing will - therefore only happen when the <em>last</em><seealso marker="#users">user</seealso> unloads the driver, or the + therefore only happen when the <em>last</em> <seealso marker="#users">user</seealso> unloads the driver, or the last process having loaded the driver exits.</p> <p>This interface (or at least the name of the functions) is kept for backward compatibility. Using <seealso marker="#try_load/3">try_load/3</seealso> with @@ -551,16 +535,11 @@ </desc> </func> <func> - <name>reload(Path, Name) -> ok | {error, ErrorDesc}</name> + <name name="reload" arity="2"/> <fsummary>Replace a driver</fsummary> - <type> - <v>Path = Name = string() | atom()</v> - <v>ErrorDesc = pending_process | OpaqueError</v> - <v>OpaqueError = term()</v> - </type> <desc> - <p>Reloads the driver named <c>Name</c> from a possibly - different <c>Path</c> than was previously used. This + <p>Reloads the driver named <c><anno>Name</anno></c> from a possibly + different <c><anno>Path</anno></c> than was previously used. This function is used in the code change <seealso marker="#scenarios">scenario</seealso> described in the introduction.</p> <p>If there are other <seealso marker="#users">users</seealso> @@ -574,7 +553,7 @@ <p>If one wants to avoid hanging on open ports, one should use the <seealso marker="#try_load/3">try_load/3</seealso> function instead.</p> - <p>The <c>Name</c> and <c>Path</c> parameters have exactly the + <p>The <c><anno>Name</anno></c> and <c><anno>Path</anno></c> parameters have exactly the same meaning as when calling the plain <seealso marker="#load/2">load/2</seealso> function.</p> <note> <p>Avoid mixing @@ -594,13 +573,8 @@ </desc> </func> <func> - <name>reload_driver(Path, Name) -> ok | {error, ErrorDesc}</name> + <name name="reload_driver" arity="2"/> <fsummary>Replace a driver</fsummary> - <type> - <v>Path = Name = string() | atom()</v> - <v>ErrorDesc = pending_process | OpaqueError</v> - <v>OpaqueError = term()</v> - </type> <desc> <p>Works exactly as <seealso marker="#reload/2">reload/2</seealso>, but for drivers loaded with the <seealso marker="#load_driver/2">load_driver/2</seealso> interface. </p> @@ -1066,15 +1040,11 @@ </desc> </func> <func> - <name>unload(Name) -> ok | {error, ErrorDesc}</name> + <name name="unload" arity="1"/> <fsummary>Unload a driver</fsummary> - <type> - <v>Name = string() | atom()</v> - <v>ErrorDesc = term()</v> - </type> <desc> <p>Unloads, or at least dereferences the driver named - <c>Name</c>. If the caller is the last <seealso marker="#users">user</seealso> of the driver, and there + <c><anno>Name</anno></c>. If the caller is the last <seealso marker="#users">user</seealso> of the driver, and there are no more open ports using the driver, the driver will actually get unloaded. In all other cases, actual unloading will be delayed until all ports are closed and there are no @@ -1084,7 +1054,7 @@ is no longer considered a user of the driver. For usage scenarios, see the <seealso marker="#scenarios">description</seealso> in the beginning of this document. </p> - <p>The <c>ErrorDesc</c> returned is an opaque value to be + <p>The <c><anno>ErrorDesc</anno></c> returned is an opaque value to be passed further on to the <seealso marker="#format_error/1">format_error/1</seealso> function. For more control over the operation, use the <seealso marker="#try_unload/2">try_unload/2</seealso> @@ -1094,15 +1064,11 @@ </desc> </func> <func> - <name>unload_driver(Name) -> ok | {error, ErrorDesc}</name> + <name name="unload_driver" arity="1"/> <fsummary>Unload a driver</fsummary> - <type> - <v>Name = string() | atom()</v> - <v>ErrorDesc = term()</v> - </type> <desc> <p>Unloads, or at least dereferences the driver named - <c>Name</c>. If the caller is the last <seealso marker="#users">user</seealso> of the driver, all + <c><anno>Name</anno></c>. If the caller is the last <seealso marker="#users">user</seealso> of the driver, all remaining open ports using the driver will get killed with the reason <c>driver_unloaded</c> and the driver will eventually get unloaded.</p> @@ -1112,7 +1078,7 @@ <seealso marker="#users">user</seealso>. For usage scenarios, see the <seealso marker="#scenarios">description</seealso> in the beginning of this document.</p> - <p>The <c>ErrorDesc</c> returned is an opaque value to be + <p>The <c><anno>ErrorDesc</anno></c> returned is an opaque value to be passed further on to the <seealso marker="#format_error/1">format_error/1</seealso> function. For more control over the operation, use the <seealso marker="#try_unload/2">try_unload/2</seealso> @@ -1125,7 +1091,7 @@ <name>loaded_drivers() -> {ok, Drivers}</name> <fsummary>List loaded drivers</fsummary> <type> - <v>Drivers = [Driver()]</v> + <v>Drivers = [Driver]</v> <v>Driver = string()</v> </type> <desc> @@ -1138,13 +1104,10 @@ </desc> </func> <func> - <name>format_error(ErrorDesc) -> string()</name> + <name name="format_error" arity="1"/> <fsummary>Format an error descriptor</fsummary> - <type> - <v>ErrorDesc -- see below</v> - </type> <desc> - <p>Takes an <c>ErrorDesc</c> returned by load, unload or + <p>Takes an <c><anno>ErrorDesc</anno></c> returned by load, unload or reload functions and returns a string which describes the error or warning.</p> <note> |