unix: add Getrandom syscall bindings and flags
This CL introduces the Getrandom syscall. Allowing users of
sufficiently new kernels (3.17) to detect when the operating system
lacks enough entropy to generate cryptographic random data. See:
http://man7.org/linux/man-pages/man2/getrandom.2.html
As we have updated the syscall numbers, the Getrandom function can
just be generated normally. The only other change is to mkerrors.sh
to include the GRND_* flags for getrandom from <linux/random.h>.
It is important to note that currently the mkerrors.sh script cannot
actually be run as it has fallen behind the 4.10 kernel. The GRND_*
flags were added manually.
This was originally part of a larger commit that was split up.
See CL: https://go-review.googlesource.com/37570
Change-Id: I464088a9c9f7224abdcdae476b30a4f2f412d9f5
Reviewed-on: https://go-review.googlesource.com/37589
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Matt Layher <mdlayher@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index b3a34c8..d66fc84 100755
--- a/unix/mkerrors.sh
+++ b/unix/mkerrors.sh
@@ -123,6 +123,7 @@
#include <linux/falloc.h>
#include <linux/filter.h>
#include <linux/netlink.h>
+#include <linux/random.h>
#include <linux/reboot.h>
#include <linux/rtnetlink.h>
#include <linux/ptrace.h>
@@ -349,6 +350,7 @@
$2 ~ /^CLOCK_/ ||
$2 ~ /^CAN_/ ||
$2 ~ /^ALG_/ ||
+ $2 ~ /^GRND_/ ||
$2 ~ /^SPLICE_/ ||
$2 !~ "WMESGLEN" &&
$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index 326be81..c011947 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -1038,6 +1038,7 @@
//sysnb Getpid() (pid int)
//sysnb Getppid() (ppid int)
//sys Getpriority(which int, who int) (prio int, err error)
+//sys Getrandom(buf []byte, flags int) (n int, err error)
//sysnb Getrusage(who int, rusage *Rusage) (err error)
//sysnb Getsid(pid int) (sid int, err error)
//sysnb Gettid() (tid int)
diff --git a/unix/zerrors_linux_386.go b/unix/zerrors_linux_386.go
index c13799f..297b0b4 100644
--- a/unix/zerrors_linux_386.go
+++ b/unix/zerrors_linux_386.go
@@ -437,6 +437,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_amd64.go b/unix/zerrors_linux_amd64.go
index 1937e46..908df5b 100644
--- a/unix/zerrors_linux_amd64.go
+++ b/unix/zerrors_linux_amd64.go
@@ -437,6 +437,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_arm.go b/unix/zerrors_linux_arm.go
index d64a129..4ce3dee 100644
--- a/unix/zerrors_linux_arm.go
+++ b/unix/zerrors_linux_arm.go
@@ -422,6 +422,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_arm64.go b/unix/zerrors_linux_arm64.go
index c0acbb5..10e97ed 100644
--- a/unix/zerrors_linux_arm64.go
+++ b/unix/zerrors_linux_arm64.go
@@ -451,6 +451,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_mips.go b/unix/zerrors_linux_mips.go
index 6eece7e..a3c8261 100644
--- a/unix/zerrors_linux_mips.go
+++ b/unix/zerrors_linux_mips.go
@@ -427,6 +427,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_mips64.go b/unix/zerrors_linux_mips64.go
index a11dbb3..1fdb641 100644
--- a/unix/zerrors_linux_mips64.go
+++ b/unix/zerrors_linux_mips64.go
@@ -426,6 +426,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
ICANON = 0x2
ICMPV6_FILTER = 0x1
diff --git a/unix/zerrors_linux_mips64le.go b/unix/zerrors_linux_mips64le.go
index 9058318..3341d4d 100644
--- a/unix/zerrors_linux_mips64le.go
+++ b/unix/zerrors_linux_mips64le.go
@@ -426,6 +426,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
ICANON = 0x2
ICMPV6_FILTER = 0x1
diff --git a/unix/zerrors_linux_mipsle.go b/unix/zerrors_linux_mipsle.go
index 974b375..f363c04 100644
--- a/unix/zerrors_linux_mipsle.go
+++ b/unix/zerrors_linux_mipsle.go
@@ -466,6 +466,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_ppc64.go b/unix/zerrors_linux_ppc64.go
index 58b13c0..1101fd6 100644
--- a/unix/zerrors_linux_ppc64.go
+++ b/unix/zerrors_linux_ppc64.go
@@ -456,6 +456,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x4000
IBSHIFT = 0x10
ICANON = 0x100
diff --git a/unix/zerrors_linux_ppc64le.go b/unix/zerrors_linux_ppc64le.go
index 91c3ccc..c3e7015 100644
--- a/unix/zerrors_linux_ppc64le.go
+++ b/unix/zerrors_linux_ppc64le.go
@@ -449,6 +449,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x4000
IBSHIFT = 0x10
ICANON = 0x100
diff --git a/unix/zerrors_linux_s390x.go b/unix/zerrors_linux_s390x.go
index 702894a..75d2d84 100644
--- a/unix/zerrors_linux_s390x.go
+++ b/unix/zerrors_linux_s390x.go
@@ -462,6 +462,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zerrors_linux_sparc64.go b/unix/zerrors_linux_sparc64.go
index 4c56e2f..679008f 100644
--- a/unix/zerrors_linux_sparc64.go
+++ b/unix/zerrors_linux_sparc64.go
@@ -470,6 +470,8 @@
F_ULOCK = 0x0
F_UNLCK = 0x3
F_WRLCK = 0x2
+ GRND_NONBLOCK = 0x1
+ GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2
diff --git a/unix/zsyscall_linux_386.go b/unix/zsyscall_linux_386.go
index a01725b..d4ec806 100644
--- a/unix/zsyscall_linux_386.go
+++ b/unix/zsyscall_linux_386.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_amd64.go b/unix/zsyscall_linux_amd64.go
index 1c1b25e..8b2e87d 100644
--- a/unix/zsyscall_linux_amd64.go
+++ b/unix/zsyscall_linux_amd64.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_arm.go b/unix/zsyscall_linux_arm.go
index 2359fd7..82d36a4 100644
--- a/unix/zsyscall_linux_arm.go
+++ b/unix/zsyscall_linux_arm.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_arm64.go b/unix/zsyscall_linux_arm64.go
index c3dbcad..f6cc320 100644
--- a/unix/zsyscall_linux_arm64.go
+++ b/unix/zsyscall_linux_arm64.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_mips.go b/unix/zsyscall_linux_mips.go
index 3fd164a..f91afb4 100644
--- a/unix/zsyscall_linux_mips.go
+++ b/unix/zsyscall_linux_mips.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_mips64.go b/unix/zsyscall_linux_mips64.go
index a26cad4..657d11e 100644
--- a/unix/zsyscall_linux_mips64.go
+++ b/unix/zsyscall_linux_mips64.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_mips64le.go b/unix/zsyscall_linux_mips64le.go
index 7cc92ad..31ff177 100644
--- a/unix/zsyscall_linux_mips64le.go
+++ b/unix/zsyscall_linux_mips64le.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_mipsle.go b/unix/zsyscall_linux_mipsle.go
index 79f26e5..797e633 100644
--- a/unix/zsyscall_linux_mipsle.go
+++ b/unix/zsyscall_linux_mipsle.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_ppc64.go b/unix/zsyscall_linux_ppc64.go
index 27befca..307dbb5 100644
--- a/unix/zsyscall_linux_ppc64.go
+++ b/unix/zsyscall_linux_ppc64.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_ppc64le.go b/unix/zsyscall_linux_ppc64le.go
index 0dc288e..f458a63 100644
--- a/unix/zsyscall_linux_ppc64le.go
+++ b/unix/zsyscall_linux_ppc64le.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_s390x.go b/unix/zsyscall_linux_s390x.go
index 33c086b..b1d5a9b 100644
--- a/unix/zsyscall_linux_s390x.go
+++ b/unix/zsyscall_linux_s390x.go
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
diff --git a/unix/zsyscall_linux_sparc64.go b/unix/zsyscall_linux_sparc64.go
index 071b85c..ce3ec58 100644
--- a/unix/zsyscall_linux_sparc64.go
+++ b/unix/zsyscall_linux_sparc64.go
@@ -1,7 +1,7 @@
-// mksyscall.pl syscall_linux.go syscall_linux_sparc64.go
+// mksyscall.pl -tags linux,sparc64 syscall_linux.go syscall_linux_sparc64.go
// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
-// +build
+// +build linux,sparc64
package unix
@@ -543,6 +543,23 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func Getrandom(buf []byte, flags int) (n int, err error) {
+ var _p0 unsafe.Pointer
+ if len(buf) > 0 {
+ _p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
+ }
+ r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
+ n = int(r0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {
