Date: Mon, 22 Jul 2019 01:21:25 +0000 (UTC) From: Laurie Jennings <laurie_jennings_1977@yahoo.com> To: FreeBSD Net <freebsd-net@freebsd.org> Cc: John Baldwin <jhb@freebsd.org>, Konstantin Belousov <kostikbel@gmail.com> Subject: mmap kernel chunk into user space Message-ID: <2146491394.4652133.1563758485195@mail.yahoo.com> References: <2146491394.4652133.1563758485195.ref@mail.yahoo.com>
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Im wondering if there have been changes to the api since FreeBSD 9 as I can't get some code I'm porting to work.
I have a block of kernel memory wired down and I want to map it to user space. Its just a big structure that has stats and other volatile info. In 9.x I was able to simply do:
// kptr has the kernel address obtained from an ioctl call
fd=open("/dev/kmem",O_RDWR);memp=mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,fd,(off_t)kptr);
And it just worked. In 11.3 it fails, and I havent been able to get ANYTHING to work with this method. I'm open to another method; I read something about mmap no longer supportinjgkmem. In which case, what can I do?
LJ
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Subject: [Bug 184141] [ppp] [patch] Kernel PPPoE sends bad echo-req magic
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