June 2005 - Darwin-dev - lists.apple.com

Re: How to determine active semaphores?
by Paul Ripke 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Monday, Jun 27, 2005, at 11:10 Australia/Sydney, Tron Thomas wrote: The sem_open, sem_close, sem_unlink family of routines implement POSIX semaphores. The semop, semget, semctl family implement System V semaphores. ipcs and ipcrm only view and delete System V objects. I don't know of any way to view what POSIX semaphores are in existence. And from memory, you're using the POSIX routines, hence nothing from ipcs. I think I led you down the wrong path with ipcs! Cheers, -- stix _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… I want to determine how many active semaphores are on my system, and I'm not sure how this can be done. It seems I can know how many semaphores are allowed by using the sysctl command. Someone had suggested that the ipcs command would be helpful. When I use it like this: ipcs -as This is the output I get, which I don't find to be helpful: Semaphores: T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME What command can give me the information I am seeking? This email sent to site_archiver(a)lists.apple.com

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Re: ICMP Router Discovery
by Andrew Gallatin 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Chase writes: > On Jun 28, 2005, at 7:13 PM, Justin C. Walker wrote: > > > Can you describe your goals? > > > the goal is simply to get a router address for a given interface. > > i have a list of interfaces. some have ip addresses. some don't. > for those that do, i need the gateway address that they are connected > to. As others have pointed out, an interface may not have any router associated with it. Alternatively, an interface may have more than one router associated with it. Take en0 from my configuration for an example of an interface with multiple routers: It is configured with: inet 172.31.130.133 netmask 0xffff0000 broadcast 172.31.255.255 Interesting routes are: default 172.31.128.254 172.31.192/19 172.31.128.254 This means that it *should* be able to talk to all hosts from 172.31.0.1 -> 172.31.254.254 directly. For IP addresses outside that range, it will use the default router. However, we started adding remote office VPNs in the range 172.31.{192,193,194, etc}. So we need to add an explicit route through the VPN gateway to be able to talk to hosts on those subnets. This is what the 172.31.192/19 route is for. It happens that the VPN gateway is the same as our router, but this is a coincidence, not a requirement. Take en1 from my configuration for an example of an interface with no routers: It is configured with inet: 10.0.130.133 netmask 0xffff0000 broadcast 10.0.255.255 There are no interesting routes. Eg: netstat -rn | grep en1 10/16 link#6 UCS 3 0 en1 10.0.130.108 0:60:dd:49:93:ee UHLW 0 1 en1 1000 10.0.130.109 0:60:dd:49:95:ef UHLW 0 2 en1 1003 10.0.130.134 0:60:dd:48:f9:f0 UHLW 2 867834 en1 941 It intentionally has no routes added, because this is a private test LAN for my company's network adaptors and there are no routes out of it. Drew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ICMP Router Discovery
by Peter Lovell 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jun 28, 2005, at 9:00 PM, Chase wrote: the goal is simply to get a router address for a given interface. Regards.....Peter _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… i have a list of interfaces. some have ip addresses. some don't. for those that do, i need the gateway address that they are connected to. But the point is that not every interface will have a router or gateway on it. Some will, others may not. Even if there is a router prepared to handle a certain type of traffic, your local configuration might have been configured to not use it, and handle traffic through a different one. Possible reasons for this are load balancing and network redundancy. So there might be a router on each interface, and then again possibly not. There doesn't even HAVE to be a default gateway, as I can attest from having borking a configuration. In this situation you can connect only to machines local on the same net. Not very useful for what we mostly want to do, yet it's still a "valid" configuration. This email sent to site_archiver(a)lists.apple.com

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Re: we were opensource, once
by Sam Hart 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Markus wrote: If you want to know about and participate in the future of the Apple version of gcc, looking an Apple Darwin or OpenDarwin is moot, you have to discuss on gcc's mailing lists instead. S a m _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… not to appear too pedantic, but thats true of all gcc development regardless This email sent to site_archiver(a)lists.apple.com

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time outs error while connecting to opensouce cvs
by She Jian, Chia 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=T7fobn6CEfTW2bz10xht0kS0h8Sg2Gwlx/V3AJcFqq2hqY9kgthu/igAyvE+1ikI4D19ePywp5kznNHWlwOkdbCwUPcfSZr0RojhvUfW7oirXTwOMnpuR/RzbHWwbV5r2rAHvBpmvYMNtoyGRgW8e4NxJ7akb02QrFSVZqbJCy4= ; Hi I am currently using the Mac OS X 10.3.9. And when I trying to log into the anoncvs.opensource.apple.com, I get this error. $ export CVS_RSH=ssh $ export CVSROOT=:ext:apsl@anoncvs.opensource.apple.com:/cvs/apsl $ cvs co mDNSResponder ssh: connect to host anoncvs.opensource.apple.com port 22: Operation timed out cvs [checkout aborted]: end of file from server (consult above messages if any) is there anything I can do to make this working? Thanks regards shejian.. ____________________________________________________ Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football http://football.fantasysports.yahoo.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ICMP Router Discovery
by Andrew White 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla Thunderbird 0.9 (Macintosh/20041103) the goal is simply to get a router address for a given interface. For example: ----- % ifconfig -au inet lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 inet 127.0.0.1 netmask 0xff000000 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet 172.16.1.250 netmask 0xffffff00 broadcast 172.16.1.255 ppp0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1444 inet 10.96.97.98 --> 10.96.97.97 netmask 0xff000000 ----- ----- % netstat -rn -f inet Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 172.16.1.1 UGSc 9 7 en0 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 9 87249 lo0 10.96.1.2 172.16.1.1 UGHS 1326 1417 en0 10.96.97/24 10.96.97.97 UGSc 1 0 ppp0 10.96.121/24 10.96.97.97 UGSc 2 6 ppp0 10.96.97.97 10.96.97.98 UH 5 0 ppp0 169.254 link#4 UCS 0 0 en0 172.16.1/24 link#4 UCS 1 0 en0 172.16.1.1 0:e0:29:73:8a:2d UHLW 11 0 en0 657 172.16.1.250 127.0.0.1 UHS 0 0 lo0 ----- - Messages for 10.96.97/24, 10.96.121/24 and 10.97.97.97 go out ppp0. - Messages for 127/8, 127.0.0.1 and 172.16.1.250 go "out" lo0. -- Andrew White -------------------------------------------------------------------------- This email and any attachments may be confidential. They may contain legally privileged information or copyright material. You should not read, copy, use or disclose them without authorisation. If you are not an intended recipient, please contact us at once by return email and then delete both messages. We do not accept liability in connection with computer virus, data corruption, delay, interruption, unauthorised access or unauthorised amendment. This notice should not be removed. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Chase wrote: i have a list of interfaces. some have ip addresses. some don't. for those that do, i need the gateway address that they are connected to. For an ethernet interface, this isn't a meaningful concept. An ethernet interface address belongs to a subnet, and theoretically has direct access to any other address on that subnet. en0 is a normal ethernet address. It can directly send packets to any address in the range 172.16.1.1 to 172.16.1.254, as well as to all addresses in that range (172.16.1.255). ppp0 is a tunnel, so it has a specified endpoint and its own set of rules (BTW - the ppp0 addresses are faked). This is the list of "gateways" my machine knows about. 172.16.1.1 is the inside interface of my home router, discovered via DHCP. 10.96.97.97 is the other end of my ppp VPN link, discovered via the ppp setup program and passed down from 10.96.1.2 (my VPN access point). It's entirely possible that there are other routers on the 172.16.1/24 subnet, but there's no way I'd know that unless someone or something told me that they were willing to forward my packets to a specific address. That is the general definition of a router - a device with more than 1 interface that is willing to pass (forward) packets across its interfaces. In IPv4 land, a non-router (a 'host') is usually associated with one router and passes all its packets to that router (the default gateway) unless it is explicitly told to send them somewhere else (such as an on-link device or an explicit rule for a particular address range). Between themselves, the routers often run a protocol (such as RIP) to pass information about who has direct access to which subnets - this allows them to make "next hop" routing decisions. But nothing forces a router to participate in such a protocol, or even admit to outside devices that it will forward packets. IPv6 does have the concept of routers that advertise their presence. The message basically says "I am a router, this is your subnet, this is my address, I'm willing to be your default gateway". Even so, nothing stops a machine deciding to forward packets (be a router) without advertising the fact. Though perhaps I've missed your point. There is no concept of an interface being "connected to" a router. Rather, the routing table associates a destination address with a gateway, and then the interface required to reach that gateway. The table above shows 11 address ranges. - Messages for 10.96.1.2, 169.254/16, 172.16.1/24, 172.16.1.1 and default (ie "anything else") go out en0. In each case, the "Gateway" entry gives the next-hop destination address of the outgoing packet. If the destination is not the target address, then the gateway is (hopefully) a router that can pass it on again. You could reverse the description and say that the router 172.16.1.1 is associated with en0 and 10.96.97.97 is associated with ppp0, but the interface doesn't own the router (or vice-versa). Rather, the router just happens to be next-hop accessible on that interface. This email sent to site_archiver(a)lists.apple.com

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Re: ICMP Router Discovery
by Justin C. Walker 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jun 28, 2005, at 18:00 , Chase wrote: On Jun 28, 2005, at 7:13 PM, Justin C. Walker wrote: Can you describe your goals? the goal is simply to get a router address for a given interface. Don't know if this helps, or just confuses the issue. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- If you're not confused, You're not paying attention -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… i have a list of interfaces. some have ip addresses. some don't. for those that do, i need the gateway address that they are connected to. Ah. That may not be a solvable problem in any portable way. As you have observed, not all routers behave in a predictable way, and there is a great difference across platforms regarding how this information is obtained. I'm not familiar enough with recent BSD's, Linux's, or Windozen, to know whether there is something analogous to Mac OS X's solution on these platforms. Also, note that the routers you collect (on Mac OS X) from the SystemConfiguration framework are not necessarily in active use by the workstation. These router addresses are intended to be used as the default router address if the interface in question becomes the 'primary' One reason not to collect this information from the attached network (dynamically, as you were trying to) is that you don't know that a given router, found on a subnet/cable, is going to be useful for that workstation. This email sent to site_archiver(a)lists.apple.com

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Re: Building shared libraries
by Matt Watson 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com On Jun 28, 2005, at 5:51 PM, damien.cooke(a)internode.on.net wrote: gcc -o mylib.so -G -Kpic somecode.c What do you expect it to do? The man page says: matt. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Sorry for the potentially dumb question. Why does -G not work for the apple build of gcc? The following code works for other builds of gcc Is the issue historical? -G num On embedded PowerPC systems, put global and static items less than or equal to num bytes into the small data or bss sections instead of the normal data or bss section. By default, num is 8. The -G num switch is also passed to the linker. All modules should be compiled with the same -G num value. This email sent to site_archiver(a)lists.apple.com

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Re: ICMP Router Discovery
by Chase 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jun 28, 2005, at 7:13 PM, Justin C. Walker wrote: the goal is simply to get a router address for a given interface. that's all. - chase _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Can you describe your goals? i have a list of interfaces. some have ip addresses. some don't. for those that do, i need the gateway address that they are connected to. This email sent to site_archiver(a)lists.apple.com

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Building shared libraries
by damien.cooke＠internode.on.net 29 Jun '05

29 Jun '05

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com Sorry for the potentially dumb question. Why does -G not work for the apple build of gcc? The following code works for other builds of gcc gcc -o mylib.so -G -Kpic somecode.c Is the issue historical? Damien _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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