syscall: implement Reboot for linux.

The published interface is the simple version of the syscall,
allowing all reboot functions except for the esoteric
LINUX_REBOOT_CMD_RESTART2.

R=golang-dev, bradfitzgo, bradfitzwork
CC=golang-dev
https://golang.org/cl/4256060

src/pkg/syscall/mkerrors.sh

@@ -30,6 +30,7 @@ includes_Linux='
 #include <linux/ptrace.h>
 #include <linux/wait.h>
 #include <linux/if_tun.h>
+#include <linux/reboot.h>
 #include <net/if.h>
 #include <netpacket/packet.h>
 '
@@ -124,6 +125,8 @@ done
 		$2 == "CTL_MAXNAME" ||
 		$2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
 		$2 ~ /^(O|F|FD|NAME|S|PTRACE)_/ ||
+		$2 ~ /^LINUX_REBOOT_CMD_/ ||
+		$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
 		$2 ~ /^SIOC/ ||
 		$2 !~ "WMESGLEN" &&
 		$2 ~ /^W[A-Z0-9]+$/ {printf("\t$%s = %s,\n", $2, $2)}

src/pkg/syscall/syscall_linux.go

@@ -667,6 +667,11 @@ func PtraceAttach(pid int) (errno int) { return ptrace(PTRACE_ATTACH, pid, 0, 0)
 
 func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
 
+//sys	reboot(magic1 uint, magic2 uint, cmd int, arg string) (errno int)
+func Reboot(cmd int) (errno int) {
+	return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
+}
+
 // Sendto
 // Recvfrom
 // Socketpair
@@ -842,7 +847,6 @@ func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0)
 // Quotactl
 // Readahead
 // Readv
-// Reboot
 // RemapFilePages
 // Removexattr
 // RequestKey

src/pkg/syscall/zerrors_linux_386.go

@@ -408,6 +408,16 @@ const (
 	IP_TOS                           = 0x1
 	IP_TTL                           = 0x2
 	IP_UNBLOCK_SOURCE                = 0x25
+	LINUX_REBOOT_CMD_CAD_OFF         = 0
+	LINUX_REBOOT_CMD_CAD_ON          = 0x89abcdef
+	LINUX_REBOOT_CMD_HALT            = 0xcdef0123
+	LINUX_REBOOT_CMD_KEXEC           = 0x45584543
+	LINUX_REBOOT_CMD_POWER_OFF       = 0x4321fedc
+	LINUX_REBOOT_CMD_RESTART         = 0x1234567
+	LINUX_REBOOT_CMD_RESTART2        = 0xa1b2c3d4
+	LINUX_REBOOT_CMD_SW_SUSPEND      = 0xd000fce2
+	LINUX_REBOOT_MAGIC1              = 0xfee1dead
+	LINUX_REBOOT_MAGIC2              = 0x28121969
 	MAP_32BIT                        = 0x40
 	MAP_ANON                         = 0x20
 	MAP_ANONYMOUS                    = 0x20

src/pkg/syscall/zerrors_linux_amd64.go

@@ -408,6 +408,16 @@ const (
 	IP_TOS                           = 0x1
 	IP_TTL                           = 0x2
 	IP_UNBLOCK_SOURCE                = 0x25
+	LINUX_REBOOT_CMD_CAD_OFF         = 0
+	LINUX_REBOOT_CMD_CAD_ON          = 0x89abcdef
+	LINUX_REBOOT_CMD_HALT            = 0xcdef0123
+	LINUX_REBOOT_CMD_KEXEC           = 0x45584543
+	LINUX_REBOOT_CMD_POWER_OFF       = 0x4321fedc
+	LINUX_REBOOT_CMD_RESTART         = 0x1234567
+	LINUX_REBOOT_CMD_RESTART2        = 0xa1b2c3d4
+	LINUX_REBOOT_CMD_SW_SUSPEND      = 0xd000fce2
+	LINUX_REBOOT_MAGIC1              = 0xfee1dead
+	LINUX_REBOOT_MAGIC2              = 0x28121969
 	MAP_32BIT                        = 0x40
 	MAP_ANON                         = 0x20
 	MAP_ANONYMOUS                    = 0x20

src/pkg/syscall/zerrors_linux_arm.go

@@ -379,6 +379,16 @@ const (
 	IP_TOS                           = 0x1
 	IP_TTL                           = 0x2
 	IP_UNBLOCK_SOURCE                = 0x25
+	LINUX_REBOOT_CMD_CAD_OFF         = 0
+	LINUX_REBOOT_CMD_CAD_ON          = 0x89abcdef
+	LINUX_REBOOT_CMD_HALT            = 0xcdef0123
+	LINUX_REBOOT_CMD_KEXEC           = 0x45584543
+	LINUX_REBOOT_CMD_POWER_OFF       = 0x4321fedc
+	LINUX_REBOOT_CMD_RESTART         = 0x1234567
+	LINUX_REBOOT_CMD_RESTART2        = 0xa1b2c3d4
+	LINUX_REBOOT_CMD_SW_SUSPEND      = 0xd000fce2
+	LINUX_REBOOT_MAGIC1              = 0xfee1dead
+	LINUX_REBOOT_MAGIC2              = 0x28121969
 	NAME_MAX                         = 0xff
 	O_ACCMODE                        = 0x3
 	O_APPEND                         = 0x400

src/pkg/syscall/zsyscall_linux_386.go

@@ -81,6 +81,14 @@ func ptrace(request int, pid int, addr uintptr, data uintptr) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func reboot(magic1 uint, magic2 uint, cmd int, arg string) (errno int) {
+	_, _, e1 := Syscall6(SYS_REBOOT, uintptr(magic1), uintptr(magic2), uintptr(cmd), uintptr(unsafe.Pointer(StringBytePtr(arg))), 0, 0)
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Access(path string, mode uint32) (errno int) {
 	_, _, e1 := Syscall(SYS_ACCESS, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(mode), 0)
 	errno = int(e1)

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -81,6 +81,14 @@ func ptrace(request int, pid int, addr uintptr, data uintptr) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func reboot(magic1 uint, magic2 uint, cmd int, arg string) (errno int) {
+	_, _, e1 := Syscall6(SYS_REBOOT, uintptr(magic1), uintptr(magic2), uintptr(cmd), uintptr(unsafe.Pointer(StringBytePtr(arg))), 0, 0)
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Access(path string, mode uint32) (errno int) {
 	_, _, e1 := Syscall(SYS_ACCESS, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(mode), 0)
 	errno = int(e1)

src/pkg/syscall/zsyscall_linux_arm.go

@@ -81,6 +81,14 @@ func ptrace(request int, pid int, addr uintptr, data uintptr) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func reboot(magic1 uint, magic2 uint, cmd int, arg string) (errno int) {
+	_, _, e1 := Syscall6(SYS_REBOOT, uintptr(magic1), uintptr(magic2), uintptr(cmd), uintptr(unsafe.Pointer(StringBytePtr(arg))), 0, 0)
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Access(path string, mode uint32) (errno int) {
 	_, _, e1 := Syscall(SYS_ACCESS, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(mode), 0)
 	errno = int(e1)