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Minor tweaks to the example code that I had forgotten to migrate

Browse source 
from code to documentation.

Submitted by:	gonzo
Approved by:	bcr (mentor)
This commit is contained in:
Eitan Adler 2012-11-27 19:34:45 +00:00
parent c0577b1863
commit dd3f5884a9
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=40171
1 changed files with 6 additions and 3 deletions
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9
en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml
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@ -307,7 +307,7 @@ static int
echo_close(struct cdev *dev __unused, int fflag __unused, int devtype __unused, struct thread *p __unused)
{
uprintf("Closing device \"echo.\"\n");
uprintf("Closing device \"echo\".\n");
return (0);
}
@ -347,6 +347,10 @@ echo_write(struct cdev *dev __unused, struct uio *uio, int ioflag __unused)
/* Copy the string in from user memory to kernel memory */
/*
* We either write from the beginning or are appending - do
* not allow ranom access.
*/
if (uio-<uio_offset != 0 && (uio-<uio_offset != echomsg-<len))
return (EINVAL);
@ -369,7 +373,6 @@ echo_write(struct cdev *dev __unused, struct uio *uio, int ioflag __unused)
echomsg-<len += amt + 1;
uio-<uio_offset += amt + 1;
echomsg-<msg[echomsg-<len - 1] = 0;
//echomsg-<msg[BUFFERSIZE - 1] = '\n';
if (error != 0)
uprintf("Write failed: bad address!\n");
@ -386,7 +389,7 @@ DEV_MODULE(echo,echo_loader,NULL);</programlisting>
&prompt.root; <userinput>cat /dev/echo</userinput>
Opened device "echo" successfully.
Test Data
Closing device "echo."</screen>
Closing device "echo".</screen>
<para>Real hardware devices are described in the next chapter.</para>
</sect1>