Commit 06afff00 authored by Sam Bishop's avatar Sam Bishop Committed by Greg Kroah-Hartman

USB doc patch 2

A little more detail on how and when to poll() /proc/bus/usb/devices.
Signed-off-by: default avatarSam Bishop <sam@bishop.dhs.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 34132326
...@@ -453,14 +453,25 @@ ...@@ -453,14 +453,25 @@
file in your Linux kernel sources. file in your Linux kernel sources.
</para> </para>
<para>Otherwise the main use for this file from programs <para>This file, in combination with the poll() system call, can
is to poll() it to get notifications of usb devices also be used to detect when devices are added or removed:
as they're plugged or unplugged. <programlisting>int fd;
To see what changed, you'd need to read the file and struct pollfd pfd;
compare "before" and "after" contents, scan the filesystem,
or see its hotplug event. fd = open("/proc/bus/usb/devices", O_RDONLY);
pfd = { fd, POLLIN, 0 };
for (;;) {
/* The first time through, this call will return immediately. */
poll(&amp;pfd, 1, -1);
/* To see what's changed, compare the file's previous and current
contents or scan the filesystem. (Scanning is more precise.) */
}</programlisting>
Note that this behavior is intended to be used for informational
and debug purposes. It would be more appropriate to use programs
such as udev or HAL to initialize a device or start a user-mode
helper program, for instance.
</para> </para>
</sect1> </sect1>
<sect1> <sect1>
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment