unix: implement Vmsplice, add SPLICE_F_* constants
Fixes golang/go#19125
Change-Id: I822b6f260f980178da29a552c6170cb261c8e254
Reviewed-on: https://go-review.googlesource.com/37152
Run-TryBot: Matt Layher <mdlayher@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index eec533f..374c052 100755
--- a/unix/mkerrors.sh
+++ b/unix/mkerrors.sh
@@ -345,6 +345,7 @@
$2 ~ /^CLOCK_/ ||
$2 ~ /^CAN_/ ||
$2 ~ /^ALG_/ ||
+ $2 ~ /^SPLICE_/ ||
$2 !~ "WMESGLEN" &&
$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
$2 ~ /^__WCOREFLAG$/ {next}
@@ -460,7 +461,7 @@
printf("\t%d: \"%s\",\n", e, buf);
}
printf("}\n\n");
-
+
printf("\n\n// Signal table\n");
printf("var signals = [...]string {\n");
qsort(signals, nelem(signals), sizeof signals[0], intcmp);
diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index dc711db..326be81 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -1118,6 +1118,25 @@
//sys Mlockall(flags int) (err error)
//sys Munlockall() (err error)
+// Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd,
+// using the specified flags.
+func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) {
+ n, _, errno := Syscall6(
+ SYS_VMSPLICE,
+ uintptr(fd),
+ uintptr(unsafe.Pointer(&iovs[0])),
+ uintptr(len(iovs)),
+ uintptr(flags),
+ 0,
+ 0,
+ )
+ if errno != 0 {
+ return 0, syscall.Errno(errno)
+ }
+
+ return int(n), nil
+}
+
/*
* Unimplemented
*/
@@ -1245,7 +1264,6 @@
// Utimensat
// Vfork
// Vhangup
-// Vmsplice
// Vserver
// Waitid
// _Sysctl
diff --git a/unix/zerrors_linux_386.go b/unix/zerrors_linux_386.go
index 4cbae25..5759f79 100644
--- a/unix/zerrors_linux_386.go
+++ b/unix/zerrors_linux_386.go
@@ -1305,6 +1305,10 @@
SO_TIMESTAMPING = 0x25
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_amd64.go b/unix/zerrors_linux_amd64.go
index abcb07a..88c6ac6 100644
--- a/unix/zerrors_linux_amd64.go
+++ b/unix/zerrors_linux_amd64.go
@@ -1306,6 +1306,10 @@
SO_TIMESTAMPING = 0x25
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_arm.go b/unix/zerrors_linux_arm.go
index 8d6b101..2ee1536 100644
--- a/unix/zerrors_linux_arm.go
+++ b/unix/zerrors_linux_arm.go
@@ -1229,6 +1229,10 @@
SO_TIMESTAMPING = 0x25
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_arm64.go b/unix/zerrors_linux_arm64.go
index 750fffc..767b166 100644
--- a/unix/zerrors_linux_arm64.go
+++ b/unix/zerrors_linux_arm64.go
@@ -1361,6 +1361,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_mips.go b/unix/zerrors_linux_mips.go
index ca0f1dc..677abd1 100644
--- a/unix/zerrors_linux_mips.go
+++ b/unix/zerrors_linux_mips.go
@@ -1280,6 +1280,10 @@
SO_TIMESTAMPING = 0x25
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x1008
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_mips64.go b/unix/zerrors_linux_mips64.go
index 3744707..46dba95 100644
--- a/unix/zerrors_linux_mips64.go
+++ b/unix/zerrors_linux_mips64.go
@@ -1376,6 +1376,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x1008
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_mips64le.go b/unix/zerrors_linux_mips64le.go
index acb961b..ee94a6e 100644
--- a/unix/zerrors_linux_mips64le.go
+++ b/unix/zerrors_linux_mips64le.go
@@ -1376,6 +1376,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x1008
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_mipsle.go b/unix/zerrors_linux_mipsle.go
index 06e009d..974b375 100644
--- a/unix/zerrors_linux_mipsle.go
+++ b/unix/zerrors_linux_mipsle.go
@@ -1451,6 +1451,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x1008
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_ppc64.go b/unix/zerrors_linux_ppc64.go
index 8f9cbdb..ce4607d 100644
--- a/unix/zerrors_linux_ppc64.go
+++ b/unix/zerrors_linux_ppc64.go
@@ -1429,6 +1429,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_ppc64le.go b/unix/zerrors_linux_ppc64le.go
index 54e8627..729ef75 100644
--- a/unix/zerrors_linux_ppc64le.go
+++ b/unix/zerrors_linux_ppc64le.go
@@ -1428,6 +1428,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_s390x.go b/unix/zerrors_linux_s390x.go
index 50767f2..68c9ec6 100644
--- a/unix/zerrors_linux_s390x.go
+++ b/unix/zerrors_linux_s390x.go
@@ -1483,6 +1483,10 @@
SO_TIMESTAMPNS = 0x23
SO_TYPE = 0x3
SO_WIFI_STATUS = 0x29
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
diff --git a/unix/zerrors_linux_sparc64.go b/unix/zerrors_linux_sparc64.go
index a66df2e..4c56e2f 100644
--- a/unix/zerrors_linux_sparc64.go
+++ b/unix/zerrors_linux_sparc64.go
@@ -1524,6 +1524,10 @@
SO_TIMESTAMPNS = 0x21
SO_TYPE = 0x1008
SO_WIFI_STATUS = 0x25
+ SPLICE_F_GIFT = 0x8
+ SPLICE_F_MORE = 0x4
+ SPLICE_F_MOVE = 0x1
+ SPLICE_F_NONBLOCK = 0x2
S_BLKSIZE = 0x200
S_IEXEC = 0x40
S_IFBLK = 0x6000
