Date: Mon, 10 Aug 2009 14:39:31 +0300 From: Krassimir Slavchev <krassi@bulinfo.net> To: freebsd-hackers@freebsd.org Subject: Help with device drivers Message-ID: <4A8006F3.5020800@bulinfo.net>
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Hi All,
Looking at sys/dev/usb/misc/ufm.c
...
static int
ufm_open(struct usb_fifo *dev, int fflags)
{
if ((fflags & (FWRITE | FREAD)) != (FWRITE | FREAD)) {
return (EACCES);
}
return (0);
}
...
and sys/dev/usb/storage/urio.c
...
static int
urio_open(struct usb_fifo *fifo, int fflags)
{
struct urio_softc *sc = usb_fifo_softc(fifo);
if ((fflags & (FWRITE | FREAD)) != (FWRITE | FREAD)) {
return (EACCES);
}
...
If I try to open the device from userland with:
fd = open("/dev/xxx0", O_RDWR) it fails because open() tries to open the
device for reading first and then for writing.
Do I use the wrong function to open such devices?
Best Regards
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