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authorTom Gundersen <teg@jklm.no>2015-06-17 19:48:15 +0200
committerTom Gundersen <teg@jklm.no>2015-06-17 19:48:15 +0200
commit00dbd902e9d55694cfb7c143ab54e8c08484d28e (patch)
tree819179cb6426e63168a514d8310078648b83d605 /man/udev_device_new_from_syspath.xml
parenta54941f1b47507e1609f0d8eb224f5a5a5732c0e (diff)
man: libudev - add description to udev_device_*
Diffstat (limited to 'man/udev_device_new_from_syspath.xml')
-rw-r--r--man/udev_device_new_from_syspath.xml47
1 files changed, 44 insertions, 3 deletions
diff --git a/man/udev_device_new_from_syspath.xml b/man/udev_device_new_from_syspath.xml
index c3c0d763e4..fc147a879a 100644
--- a/man/udev_device_new_from_syspath.xml
+++ b/man/udev_device_new_from_syspath.xml
@@ -106,11 +106,52 @@
</funcsynopsis>
</refsynopsisdiv>
- <!--<refsect1>
+ <refsect1>
<title>Description</title>
- <para>XXX: Add some description.</para>
- </refsect1>-->
+ <para><function>udev_device_new_from_syspath</function>,
+ <function>udev_device_new_from_devnum</function>,
+ <function>udev_device_new_from_subsystem_sysname</function>,
+ <function>udev_device_new_from_device_id</function>, and
+ <function>udev_device_new_from_environment</function>
+ allocate a new udev device object and returns a pointer to it. This
+ object is opaque and must not be accessed by the caller via different
+ means than functions provided by libudev. Initially, the reference count
+ of the device is 1. You can acquire further references, and drop
+ gained references via <function>udev_device_ref()</function> and
+ <function>udev_device_unref()</function>. Once the reference count hits 0,
+ the device object is destroyed and freed.</para>
+
+ <para><function>udev_device_new_from_syspath</function>,
+ <function>udev_device_new_from_devnum</function>,
+ <function>udev_device_new_from_subsystem_sysname</function>, and
+ <function>udev_device_new_from_device_id</function>
+ create the device object based on information found in
+ <filename>/sys</filename> annotated with properties from the udev-internal
+ device database. A syspath is any subdirectory of <filename>/sys</filename>,
+ with the restriction that a subdirectory of <filename>/sys/devices</filename>
+ (or a symlink to one) represents a real device and as such must contain
+ a <filename>uevent</filename> file. <function>udev_device_new_from_devnum</function>
+ takes a device type, which can be <constant>b</constant> for block devices or
+ <constant>c</constant> for character devices, as well as a devnum (see
+ <citerefentry><refentrytitle>makedev</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ <function>udev_device_new_from_subsystem_sysname</function> looks up devices based
+ on the provided subsystem and sysname and
+ <function>udev_device_new_from_device_id</function> looks up devices based on the provided
+ device id (see
+ <citerefentry><refentrytitle>udev_device_get_subsystem</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ </para>
+
+ <para><function>udev_device_new_from_environment</function>
+ creates a device from the current environment (see
+ <citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>).
+ Each key-value pair is interpreted in the same way as if it was
+ received in an uevent (see
+ <citerefentry><refentrytitle>udev_monitor_receive_device</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ The keys <constant>DEVPATH</constant>, <constant>SUBSYSTEM</constant>,
+ <constant>ACTION</constant>, and <constant>SEQNUM</constant> are mandatory.</para>
+
+ </refsect1>
<refsect1>
<title>Return Value</title>