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unix: add Pipe2 on dragonfly

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The pipe2 syscall is available since DragonflyBSD 4.2, see
https://www.dragonflybsd.org/release42/

Change-Id: I94631fd64ee731e416049cac5f3d15544f1337dd
Reviewed-on: https://go-review.googlesource.com/c/sys/+/271177
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Tobias Klauser
2020-11-19 10:28:17 +00:00
committed by Tobias Klauser
parent a01c418693
commit f84b799fce
2 changed files with 23 additions and 0 deletions
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unix/syscall_dragonfly.go
+13
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@@ -105,6 +105,19 @@ func Pipe(p []int) (err error) {
return
}
//sysnb pipe2(p *[2]_C_int, flags int) (err error)
func Pipe2(p []int, flags int) 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 err
}
//sys extpread(fd int, p []byte, flags int, offset int64) (n int, err error)
func Pread(fd int, p []byte, offset int64) (n int, err error) {
return extpread(fd, p, 0, offset)