August 2011 - Darwin-kernel

booting custom kernel
by Andreas Fink 09 Aug '11

09 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I've followed the excellent up to date page on http://shantonu.blogspot.com/ for building a stock 10.7 kernel from source so I can experiment later with a modified version. I realize compiling xnu these days have becomesquicker and easier than with 10.4 and older. I however wonder: What is the currently recommended way to define another boot kernel as boot argument? In my case the filesystem is encrypted (FileVault 2.0), so its being booted through the file vault EFI driver. I want to be able to go back to my normal kernel easily and quickly in case the experimental fails totally. Booting to emergency partition and copying kernel file back and forth would be an option but then how to mount encrypted partition in that case? Just wondering whats the easiest and safest and recommended way Andreas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: problem with ifnet_get_address_list_family on Lion
by Michael Tüxen 09 Aug '11

09 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com ... the following works on Lion (same code on Leopard and SnowLeopard): static void sctp_init_ifns_for_vrf(int vrfid) { /* Here we must apply ANY locks needed by the * IFN we access and also make sure we lock * any IFA that exists as we float through the * list of IFA's */ errno_t error; ifnet_t *ifnetlist; uint32_t i, count; char name[SCTP_IFNAMSIZ]; struct ifnet *ifn; struct ifaddr *ifa; struct in6_ifaddr *ifa6; struct sctp_ifa *sctp_ifa; uint32_t ifa_flags; ifnetlist = NULL; count = 0; error = ifnet_list_get(IFNET_FAMILY_ANY, &ifnetlist, &count); if (error != 0) { printf("ifnet_list_get failed %d\n", error); goto out; } for (i = 0; i < count; i++) { ifn = ifnetlist[i]; if (SCTP_BASE_SYSCTL(sctp_ignore_vmware_interfaces) && sctp_is_vmware_interface(ifn)) { continue; } TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { if (ifa->ifa_addr == NULL) { continue; } if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) { /* non inet/inet6 skip */ continue; } if (ifa->ifa_addr->sa_family == AF_INET6) { if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { /* skip unspecifed addresses */ continue; } } else { if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) { continue; } } if (sctp_is_desired_interface_type(ifa) == 0) { /* non desired type */ continue; } if (ifa->ifa_addr->sa_family == AF_INET6) { ifa6 = (struct in6_ifaddr *)ifa; ifa_flags = ifa6->ia6_flags; } else { ifa_flags = 0; } snprintf(name, SCTP_IFNAMSIZ, "%s%d", ifn->if_name, ifn->if_unit); sctp_ifa = sctp_add_addr_to_vrf(vrfid, (void *)ifn, ifn->if_index, ifn->if_type, name, (void *)ifa, ifa->ifa_addr, ifa_flags, 0); if (sctp_ifa) { sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE; } } } out: if (ifnetlist != 0) ifnet_list_free(ifnetlist); } I hope this helps. Best regards Michael On Aug 9, 2011, at 8:13 PM, Vincent Lubet wrote: > Hi Richard, > > If you did not get a reply yet, I would suggest that you file a bug report at https://bugreporter.apple.com/ > > Vincent > > On Jul 22, 2011, at 2:26 PM, Richard Hood wrote: > >> now that we can talk about Lion . . . >> >> I'm having some problems with ifnet_get_address_list_family() on Lion. >> >> at startup my kext gets all the active IP interfaces on the system. >> the problem is that on Lion I'm getting an ENXIO (device not configured) error whereas on Snow Leopard this code is working fine. >> however, once the systems has booted, if I stop the kext and restart it the call seems to work fine. >> anyone know what has changed in Lion with-respect-to ifnet_get_address_list_family()? >> >> the code looks something like this . . . >> >> ifnet_t *interfaces = NULL; >> u_int32_t cnt = nInfos; >> int err = ifnet_list_get(IFNET_FAMILY_ETHERNET, &interfaces, &cnt); >> if (err) >> { >> NETLOG(("ifnet_list_get: error=%d\n", err)); >> return 0; >> } >> >> NETLOG(("Interface count=%d\n", cnt)); >> >> int i; >> int mm=0; >> for (i=0;i<cnt;i++) >> { >> u_int16_t flags = ifnet_flags(interfaces[i]); >> >> NETLOG(("Interface %p flags=0x%x\n", interfaces[i], flags)); >> >> if (!(flags & IFF_UP)) >> continue; >> >> ifaddr_t *addrList; >> err = ifnet_get_address_list_family(interfaces[i], &addrList, PF_INET); >> if (err) >> { >> NETLOG(("ifnet_get_address_list_family: error=%d\n", err)); >> continue; >> } >> >> >> [ code snipped ] >> >> >> } > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/michael.tuexen%40lurch… > > This email sent to michael.tuexen(a)lurchi.franken.de > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: problem with ifnet_get_address_list_family on Lion
by Vincent Lubet 09 Aug '11

09 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Richard, If you did not get a reply yet, I would suggest that you file a bug report at https://bugreporter.apple.com/ Vincent On Jul 22, 2011, at 2:26 PM, Richard Hood wrote: > now that we can talk about Lion . . . > > I'm having some problems with ifnet_get_address_list_family() on Lion. > > at startup my kext gets all the active IP interfaces on the system. > the problem is that on Lion I'm getting an ENXIO (device not configured) error whereas on Snow Leopard this code is working fine. > however, once the systems has booted, if I stop the kext and restart it the call seems to work fine. > anyone know what has changed in Lion with-respect-to ifnet_get_address_list_family()? > > the code looks something like this . . . > > ifnet_t *interfaces = NULL; > u_int32_t cnt = nInfos; > int err = ifnet_list_get(IFNET_FAMILY_ETHERNET, &interfaces, &cnt); > if (err) > { > NETLOG(("ifnet_list_get: error=%d\n", err)); > return 0; > } > > NETLOG(("Interface count=%d\n", cnt)); > > int i; > int mm=0; > for (i=0;i<cnt;i++) > { > u_int16_t flags = ifnet_flags(interfaces[i]); > > NETLOG(("Interface %p flags=0x%x\n", interfaces[i], flags)); > > if (!(flags & IFF_UP)) > continue; > > ifaddr_t *addrList; > err = ifnet_get_address_list_family(interfaces[i], &addrList, PF_INET); > if (err) > { > NETLOG(("ifnet_get_address_list_family: error=%d\n", err)); > continue; > } > > > [ code snipped ] > > > } _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Usable directions to build
by Vivek 09 Aug '11

09 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:x-stationery:content-type:content-transfer-encoding; bh=Hw0zDtECNplSToTMT/+z1xdz/a0Fo2xv3W9radqcDlc=; b=MjU+v+RzYCeXB2/i5luBsQ72Vk9H7Bwuky5QXfZI7JsKoYa5yl9SY6EmRRzhGzImuc L/lRqEq/xqNwMk9Inym3ProNXaG+t1xQQipCuPDVzGJsrrIsa2JNxZqUJ9RNmW1DQxCl n0qDeKJsZsHk16RSjyTJy2GuqgTjHqSAKjENU= User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:5.0) Gecko/20110624 Thunderbird/5.0 On 8/5/11 5:01 PM, Neil Steiner wrote: It's probably not overly painful to build this /if/ I can find the right instructions and combination of tools. Can anybody offer any hints, or point me to better documentation than I've been able to find so far? http://shantonu.blogspot.com/ updated with Lion (and clang) instructions as well. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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RE: Usable directions to build
by David Lee 06 Aug '11

06 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcxT10BIXRqbzNMkTaW7+4zKv6qcoQ== Thread-topic: Usable directions to build _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Usable directions to build
by Neil Steiner 06 Aug '11

06 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:5.0) Gecko/20110706 Firefox/5.0 SeaMonkey/2.2 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Symbolic/source level debugging is broken in kexts other than my own
by David Lee 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcxTvuLnxFLtwZW/Tyyhq26iVoEMmQ== Thread-topic: Symbolic/source level debugging is broken in kexts other than my own _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: How can I get notified that a kernel thread has been terminated ?
by Gary Kratkin 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Doesn't that still leave a race condition? After the flag is set, it will take an unknowable amount of time for the thread to finish exiting the thread function. The thread could execute code after the kext unloads. As an OSX kernel newbie I'm surprised that I don't see a conventional way to rendezvous on thread termination. I do see thread_getstatus, which could be used in a wait loop until it returns KERN_TERMINATED, but it doesn't seem to be exported. -Gary On Aug 5, 2011, at 1:11 PM, Roman Zippel wrote: > On 05.08.2011 09:34, Nicolas Connoud wrote: > >> I have tried that. The kext-unload waits for a flag to be set (this is the >> last thing my thread function does) before carrying on with the unload. >> Still it is not enough. > > There may also be race conditions at how you set the flag. > The easiest answer is probably to use an IOLock. This way you can force > the unload function to sleep until it's woken up by the thread. If the > last call in the thread is an IOLockUnlock() call, you should be fine. > > bye, Roman > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/gary%40berktool.com > > This email sent to gary(a)berktool.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: How can I get notified that a kernel thread has been terminated ?
by Nicolas Connoud 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=uYzmp7mASKkbFA8OsBNg66b3EG/5cyZoaQFk5VYOmW0=; b=m5BAr3qpYlj1Vd91xcNDV8WRxDZ81eASWD9HXdXkIhPlrKjtK43AW3KLXcitspZl5w j/4BJ9ZGBgeVYBeBe4GM5Rnin/A6q8tyFaTEQ5bA+b2FAYh8VnfwsjwzCTJMbaQhb41e ZD6qxJZPQilGQld7hAHUp7doDlcT6Ow5aDrDw= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: How can I get notified that a kernel thread has been terminated ?
by Roman Zippel 05 Aug '11

05 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Organization: Ardis Technologies BV User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.15) Gecko/20110402 Icedove/3.1.9 On 05.08.2011 09:34, Nicolas Connoud wrote: > I have tried that. The kext-unload waits for a flag to be set (this is the > last thing my thread function does) before carrying on with the unload. > Still it is not enough. There may also be race conditions at how you set the flag. The easiest answer is probably to use an IOLock. This way you can force the unload function to sleep until it's woken up by the thread. If the last call in the thread is an IOLockUnlock() call, you should be fine. bye, Roman _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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