Messages in this thread | | | Date | Fri, 28 Jan 2011 03:24:43 +0300 | From | Alexander Gordeev <> | Subject | timerfd incompatibility on mips |
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Hi!
I've just found a problem with TFD_NONBLOCK flag that can be passed to timerfd_create.
<uclibc>/libc/sysdeps/linux/common/sys/timerfd.h which is installed to /usr/include/sys/timerfd.h defines TFD_NONBLOCK as 04000 ie 0x800. BTW glibc/eglibc headers do the same thing.
<linux>/include/linux/timerfd.h declares it as O_NONBLOCK which is defined in fcntl.h. Usually O_NONBLOCK is 0x800 too but some architectures including MIPS it redefine it:
arch/mips/include/asm/fcntl.h:#define O_NONBLOCK 0x0080 arch/alpha/include/asm/fcntl.h:#define O_NONBLOCK 00004 arch/sparc/include/asm/fcntl.h:#define O_NONBLOCK 0x4000 arch/parisc/include/asm/fcntl.h:#define O_NONBLOCK 000200004
My tests show that kernel thinks that TFD_NONBLOCK is 0x80 on MIPS. I get what I want when I pass 0x80 and EINVAL when I pass 0x800. I don't know why there are such uncertain things in Linux. Probably the problem should be fixed in the kernel.
Right now one cannot use timerfd_create(..., TFD_NONBLOCK) on MIPS but can use timerfd_create(..., O_NONBLOCK) instead.
-- Alexander [unhandled content-type:application/pgp-signature] | |