Date: Fri, 18 Sep 2015 20:15:54 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 201611] [patch] Add devfs_get_cdevpriv_from_file(9) Message-ID: <bug-201611-8-KVa0qlZ0i4@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-201611-8@https.bugs.freebsd.org/bugzilla/> References: <bug-201611-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201611 --- Comment #3 from Andy Ritger <aritger@nvidia.com> --- (In reply to Konstantin Belousov from comment #2) Thanks for taking a look. Sorry that I didn't describe things well in my original post. The intent is for this usage pattern: process A: fda_dev = open("/dev/nvidia0"); // [...allocate resources...] // allocate file to pass resource to process B fda = open("/dev/nvidia0"); // associate resource with fda params.resource = handleForResource; params.fd = fda; ioctl(fda_dev, opcode, ¶ms, sizeof(params)); SendFdToProcessB(fda); close(fda); process B: fdb_dev = open("/dev/nvidia0"); // resource resource from process A fdb = RecvFdFromProcessA(); // look up resource assocated with fd params.fd = fdb; ioctl(fdb_dev, opcode, ¶ms, sizeof(params)); close(fdb); resource = params.handleForResource (i.e., the fd for the resource is different than the fd on which the ioctl is performed) It is important that fd[ab] are different than fd[ab]_dev: process A doesn't want to give process B access to _everything_: just a specific resource. Does that make sense? Thanks. -- You are receiving this mail because: You are the assignee for the bug.
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