cvs commit: src/sys/kern kern_descrip.c

Scott Long scottl at
Fri Jan 6 21:18:05 PST 2006

John Baldwin wrote:
> On Friday 06 January 2006 11:34 am, Scott Long wrote:
>>John Baldwin wrote:
>>>jhb         2006-01-06 16:30:30 UTC
>>>  FreeBSD src repository
>>>  Modified files:
>>>    sys/kern             kern_descrip.c
>>>  Log:
>>>  Return EBADF rather than EINVAL for FWRITE failure as per POSIX.
>>>  MFC after:      1 week
>>>  Revision  Changes    Path
>>>  1.290     +2 -3      src/sys/kern/kern_descrip.c
>>Technically this will be an API change if it get's MFC'd, though a
>>minor one.  If it needs to go into RELENG_6 then it should be
>>clearly documented in the release notes.
> Not really because except for the hwpmc(4) driver and the mqueue code (which 
> isn't in 6.x yet IIRC), every other caller of fget_write() ignores the errno 
> value and hardcodes EBADF, so it won't actually change the errno for any 
> applications in 6.x.

While it may not be used by much in the FreeBSD tree, the fact that
fget_write() is available via a kernel header means that it is part
of the kernel API.  It is trivial, so all I ask is that it be well
documented when it gets MFC'd.  Something along the lines of:

- fget_write() was changed to provide return values as per POSIX.


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