Those syscalls are not supported on arm64. I don't know what the
replacement is for SYS_FORK, but the replacement for dup is, SYS_DUP3.

On Sun, 2 Aug 2015 15:58 jefby notifications@github.com wrote:

Hi , recently i want to make the hyper(x86_64) work on arm64,found some
error when compiling the source code,the main information like below:

hyper/hypervisor/qemu

hypervisor/qemu/qemu_process.go:47: undefined: syscall.SYS_FORK
hypervisor/qemu/qemu_process.go:127: undefined: syscall.Dup2
hypervisor/qemu/qemu_process.go:128: undefined: syscall.Dup2
hypervisor/qemu/qemu_process.go:129: undefined: syscall.Dup2

Is go1.5beta2 not provided the syscall.Dup2 or syscall.SYS_FORK in arm64
?? If i want to use these syscall,how to do ??

Thanks very much!

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#11981.

Related, I don't know how that code is using SYS_FORK, but I'd be worried
that it was correct, forking in multi threaded programs should be performed
with extreme care.

On Sun, 2 Aug 2015 16:01 Dave Cheney dave@cheney.net wrote:

Those syscalls are not supported on arm64. I don't know what the
replacement is for SYS_FORK, but the replacement for dup is, SYS_DUP3.

On Sun, 2 Aug 2015 15:58 jefby notifications@github.com wrote:

Hi , recently i want to make the hyper(x86_64) work on arm64,found some
error when compiling the source code,the main information like below:

hyper/hypervisor/qemu

hypervisor/qemu/qemu_process.go:47: undefined: syscall.SYS_FORK
hypervisor/qemu/qemu_process.go:127: undefined: syscall.Dup2
hypervisor/qemu/qemu_process.go:128: undefined: syscall.Dup2
hypervisor/qemu/qemu_process.go:129: undefined: syscall.Dup2

Is go1.5beta2 not provided the syscall.Dup2 or syscall.SYS_FORK in arm64
?? If i want to use these syscall,how to do ??

Thanks very much!

—
Reply to this email directly or view it on GitHub
#11981.

@davecheney ok,Thanks very much.

@davecheney They uses SYS_FORK like below

ret, ret2, errno := syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)

and the source code is here.https://github.com/hyperhq/hyper/blob/master/hypervisor/qemu/qemu_process.go +47 line.

I think that code is very dangerous.

On Sun, 2 Aug 2015 16:05 jefby notifications@github.com wrote:

@davecheney https://github.com/davecheney They uses SYS_FORK like below

ret, ret2, errno := syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)

and the source code is here.
https://github.com/hyperhq/hyper/blob/master/hypervisor/qemu/qemu_process.go
+47 line.

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#11981 (comment).

@davecheney Now if i want to reimplement this feature , how to do? I'm not familiar with go language.

I recommend syscall.ForkExec. Thanks for testing on arm64.

On Sun, 2 Aug 2015 16:12 jefby notifications@github.com wrote:

@davecheney https://github.com/davecheney Now if i want to reimplement
this feature , how to do? I'm not familiar with go language.

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#11981 (comment).

Closing, because I don't think there's anything to do here.