yes, the maximum ioctl buf size is 1k, this is set by OS.
Tom Chen
--------------------------------------------------
From: "raghu" <raghu.vatsav...@qlogic.com>
Sent: Wednesday, May 04, 2011 1:34 PM
To: <driver-discuss@opensolaris.org>
Subject: [driver-discuss] I_STR ioctl
Hi,
I was trying to gather large info from my driver thru I_STR ioctl. But it
seems it is failing in some cases with large bufs like 12K, stack shown
below. Please correct me If I need to do anything more in user app or
driver:
User App::::::::::
#define BUF_SIZE2 12*1024
char buf2[BUF_SIZE];
fd = open(string, O_RDWR));
stri.ic_cmd = 3;
stri.ic_timout = 0;
bzero(buf2, BUF_SIZE2);
stri.ic_len = BUF_SIZE2;
stri.ic_dp = (char *)buf2;
if (ioctl(fd, I_STR, &stri)
Driver IOCTL :::::::::::::::::::
iocp = (struct iocblk *)(uintptr_t)mp->b_rptr;
cmd = iocp->ioc_cmd;
If (cmd == MINE) {
ptr = (void *) mp->b_cont->b_rptr;
(void) bcopy(driver->ptr, ptr, 12*1024);
mp->b_cont->b_wptr = mp->b_cont->b_rptr + 12*1024;
miocack(q, mp, 12*1024, 0);
return;
}
Stack:
strdoioctl+0x7a7()
strioctl+0x15cc()
spec_ioctl+0x67()
fop_ioctl+0x25()
ioctl+0xac()
sys_syscall+0x17b()
Regards
Raghu
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