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unix: implement Pipe using pipe2 syscall on all linux platforms

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Most architectures currently already implement Pipe using the pipe2
syscall. Only 386, amd64, mips{,le}, ppc and sparc64 still use the pipe
syscall. However, some systems (e.g. Android seccomp policies) block
that syscall, see golang/go#40828 for an example.

The pipe2 syscall was added in Linux kernel version 2.6.27. The minimum
required Linux kernel version for Go 1.18 will be changed to 2.6.32
per golang/go#45964 so it is possible to unify the implementation of
Pipe using the pipe2 syscall.

Same as CL 350530 did for package syscall.

For golang/go#45964
Fixes golang/go#40828

Change-Id: I07d84d3ea06a54e37d9ff6b72702fe5d96efef7b
Reviewed-on: https://go-review.googlesource.com/c/sys/+/350549
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser
2021-09-17 16:11:53 +00:00
committed by Tobias Klauser
parent ed5796bab1
commit d61c044b16
22 changed files with 27 additions and 379 deletions
Download Patch File Download Diff File Expand all files Collapse all files
unix/syscall_linux_mipsx.go
-23
View File
@@ -111,29 +111,6 @@ func setTimeval(sec, usec int64) Timeval {
return Timeval{Sec: int32(sec), Usec: int32(usec)}
}
//sysnb pipe2(p *[2]_C_int, flags int) (err error)
func Pipe2(p []int, flags int) (err error) {
if len(p) != 2 {
return EINVAL
}
var pp [2]_C_int
err = pipe2(&pp, flags)
p[0] = int(pp[0])
p[1] = int(pp[1])
return
}
//sysnb pipe() (p1 int, p2 int, err error)
func Pipe(p []int) (err error) {
if len(p) != 2 {
return EINVAL
}
p[0], p[1], err = pipe()
return
}
//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {