[Qemu-devel] forking with x86_64

[maheen butt]

hi

why qemu does not provide NPTL support for x86 in user mode? is there any big hindrance behind it?

 I did a small experiment

I make a program with fork system call and give its executable to qemu-x86_64
out put shows it does not create child. the I commented out this if block of linux-user/syscall.c

if ((flags & ~(CSIGNAL | CLONE_NPTL_FLAGS2)) != 0)

            return -EINVAL;

so that it can fork now as next line of code is this

fork_start();

 ret = fork();

now it started working, the child has created.

if it is so simple then wat is the hurdle that original qemu code can not run fork'ed program?

REGARDS