Date: Mon, 27 Aug 2012 13:38:24 +0200 From: Igmar Palsenberg <musl@...senberg.com> To: musl@...ts.openwall.com Subject: Re: Implementation of sys/capabilities.h > On Mon, Aug 27, 2012 at 11:23 AM, Igmar Palsenberg <igmar@...senberg.com> wrote: >>> Why in Musl out of interest? They are not in other libc's, and people >>> expect to link to libcap for them surely. And some people argue that >>> the interfaces are not very well designed (indeed libcap seems to be >>> adding extra ones not in the withdrawn posix draft), eg see >>> http://people.redhat.com/sgrubb/libcap-ng/ >> >> It's open for debate. The syscalls need to be there (including the structs the kernel uses), and I've got those in a patch. >> >> I agree the interface is shit : Way to complicated, while only need some simple functions, with a bitmap to represent them. Why implement it ? >> It's the only thing we got, and programs assume it's POSIX, so it should be present. Yes, it's broken, but capabilities are a needed feature if you ask me. >> > > Definitely add the syscalls, anyway, regardless. I'll submit a patch for that. Rich, can you handle pull request, or you want the patch on the ML ? > I am just not sure that "programs assume it's POSIX, so it should be > present", I would assume they would expect to have to link against > external libcap, which would be an explicit dependency, not assumed > part of libc. They are part of the draft POSIX 1e, but it is only a > suggestion and not a standard, and really needed more work. > > It is a difficult one, as the kernel API is a bit unpleasant. But > including a partial implementation is asking for trouble too. Perhaps > another option is a posix 1e companion library that implements the > other parts? Not sure... I prefer the kernel API over libcap any time. Kernel is one header struct (2 fields), and a struct with 3 bitfields. Can't get any easier if you ask me. I'll submit a patch for the kernel ABI, the rest if I look at it again, doesn't belong in musl. Igmar
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