Masatake YAMATO wrote:
> Before my change ltp own eventfd wrapper calls eventfd
> system call like this:
>
> static int
> myeventfd(unsigned int initval, int flags)
> {
> return syscall(__NR_eventfd, initval);
> }
>
> As you can see, FLAGS argument is not used. I guess
> this is a bug. So I changed like:
>
> static int
> myeventfd(unsigned int initval, int flags)
> {
> return syscall(__NR_eventfd, initval, flags);
> }
The eventfd() syscall does not have a flags argument. But there is another
syscall recently introduced in the kernel(> 2.6.27) called eventfd2() which
has the flags argument. From the eventfd() man page
http://www.kernel.org/doc/man-pages/online/pages/man2/eventfd.2.html
<quote>
There are two underlying Linux system calls: eventfd() and the more recent
eventfd2(). The former system call does not implement a flags argument. The
latter system call implements the flags values described above. The glibc
wrapper function will use eventfd2() where it is available.
</quote>
You can also check the code
http://lxr.linux.no/linux+v2.6.27.10/fs/eventfd.c#L201
Regards,
Vijay
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