Date: Wed, 03 Sep 1997 00:40:53 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: freebsd-hackers@freebsd.org Subject: IOCTL Commands - Where is my mistake? Message-ID: <XFMail.970903004053.Shimon@i-Connect.Net>
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Hi Y'all,
It is obvious I am making a stupid mistake, but please enlighten me:
I want to pass IOCTL commands to a driver. This is what I do:
#define DPT_IOCTL_INTERNAL_METRICS _IOW('D', 1, dpt_perf_t)
In a user program, I do:
if ( (result = ioctl(fd, DPT_IOCTL_INTERNAL_METRICS, &metrics)) != 0 ) {
(void)fprintf(stderr, "%s ERROR: Failed to send IOCTL %x - %s\n",
argv[0], DPT_IOCTL_INTERNAL_METRICS,
strerror(errno));
exit(2);
}
In the driver, I do:
...
int
dpt_ioctl(dev_t dev, int cmd, caddr_t cmdarg, int flags, struct proc *p)
...
switch (cmd) {
case DPT_IOCTL_INTERNAL_METRICS:
result = copyout((char *)&dpt->performance,
(dpt_softc_t *)(*(caddr_t *)cmdarg),
sizeof(dpt_perf_t));
return(result);
I always get:
su-2.01# dpt_dm /dev/dpt0
dpt_dm ERROR: Failed to send IOCTL 8d3c4401 - Bad address
Now, If I change the #define to:
#define DPT_IOCTL_INTERNAL_METRICS IOC_INOUT | 1
Everything will work fine!
I tried to change:
#define DPT_IOCTL_INTERNAL_METRICS _IOW('D', 1, dpt_perf_t)
to:
#define DPT_IOCTL_INTERNAL_METRICS _IOWR('D', 1, dpt_perf_t)
or even:
#define DPT_IOCTL_INTERNAL_METRICS _IOR('D', 1, dpt_perf_t)
Still the same. What di I do?
---
Sincerely Yours, (Sent on 02-Sep-97, 23:28:40 by XF-Mail)
Simon Shapiro Atlas Telecom
Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR
97005
Shimon@i-Connect.Net Voice: 503.643.5559, Emergency: 503.799.2313
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