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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fork, exec, wait, etc.
package syscall
import (
"sync"
"utf16"
)
// Windows doesn't have a good concept of just Exec in the documented API.
// However, the kernel32 CreateProcess does a good job with
// ForkExec.
var ForkLock sync.RWMutex
// Joins an array of string with sep
// From the "strings" package. Modified.
func stringJoin(a []string, sep string, escape escapeFunc) string {
if len(a) == 0 {
return ""
}
if len(a) == 1 {
return a[0]
}
n := len(sep) * (len(a) - 1)
for i := 0; i < len(a); i++ {
a[i] = escape(a[i])
n += len(a[i])
}
b := make([]byte, n)
bp := 0
for i := 0; i < len(a); i++ {
s := a[i]
for j := 0; j < len(s); j++ {
b[bp] = s[j]
bp++
}
if i+1 < len(a) {
s = sep
for j := 0; j < len(s); j++ {
b[bp] = s[j]
bp++
}
}
}
return string(b)
}
//Env block is a sequence of null terminated strings followed by a null.
//Last bytes are two unicode nulls, or four null bytes.
func createEnvBlock(envv []string) *uint16 {
if len(envv) == 0 {
return &utf16.Encode([]int("\x00\x00"))[0]
}
length := 0
for _, s := range envv {
length += len(s) + 1
}
length += 1
b := make([]byte, length)
i := 0
for _, s := range envv {
l := len(s)
copy(b[i:i+l], []byte(s))
copy(b[i+l:i+l+1], []byte{0})
i = i + l + 1
}
copy(b[i:i+1], []byte{0})
return &utf16.Encode([]int(string(b)))[0]
}
type escapeFunc func(s string) string
//escapes quotes by " -> ""
//Also string -> "string"
func escapeAddQuotes(s string) string {
//normal ascii char, one byte wide
rune := byte('"')
l := len(s)
n := 0
for i := 0; i < l; i++ {
if s[i] == rune {
n++
}
}
qs := make([]byte, l+n+2)
qs[0] = rune
j := 1
for i := 0; i < l; i++ {
qs[i+j] = s[i]
if s[i] == rune {
j++
qs[i+j] = rune
}
}
qs[len(qs)-1] = rune
return string(qs)
}
func CloseOnExec(fd int) {
SetHandleInformation(int32(fd), HANDLE_FLAG_INHERIT, 0)
}
func SetNonblock(fd int, nonblocking bool) (errno int) {
return 0
}
// TODO(kardia): Add trace
//The command and arguments are passed via the Command line parameter.
func StartProcess(argv0 string, argv []string, envv []string, dir string, fd []int) (pid, handle int, err int) {
if len(fd) > 3 {
return 0, 0, EWINDOWS
}
//CreateProcess will throw an error if the dir is not set to a valid dir
// thus get the working dir if dir is empty.
if len(dir) == 0 {
if wd, ok := Getwd(); ok == 0 {
dir = wd
}
}
startupInfo := new(StartupInfo)
processInfo := new(ProcessInformation)
GetStartupInfo(startupInfo)
startupInfo.Flags = STARTF_USESTDHANDLES
startupInfo.StdInput = 0
startupInfo.StdOutput = 0
startupInfo.StdErr = 0
// Acquire the fork lock so that no other threads
// create new fds that are not yet close-on-exec
// before we fork.
ForkLock.Lock()
defer ForkLock.Unlock()
var currentProc, _ = GetCurrentProcess()
if len(fd) > 0 && fd[0] > 0 {
err := DuplicateHandle(currentProc, int32(fd[0]), currentProc, &startupInfo.StdInput, 0, true, DUPLICATE_SAME_ACCESS)
if err != 0 {
return 0, 0, err
}
defer CloseHandle(int32(startupInfo.StdInput))
}
if len(fd) > 1 && fd[1] > 0 {
err := DuplicateHandle(currentProc, int32(fd[1]), currentProc, &startupInfo.StdOutput, 0, true, DUPLICATE_SAME_ACCESS)
if err != 0 {
return 0, 0, err
}
defer CloseHandle(int32(startupInfo.StdOutput))
}
if len(fd) > 2 && fd[2] > 0 {
err := DuplicateHandle(currentProc, int32(fd[2]), currentProc, &startupInfo.StdErr, 0, true, DUPLICATE_SAME_ACCESS)
if err != 0 {
return 0, 0, err
}
defer CloseHandle(int32(startupInfo.StdErr))
}
if len(argv) == 0 {
argv = []string{""}
}
// argv0 must not be longer then 256 chars
// but the entire cmd line can have up to 32k chars (msdn)
err = CreateProcess(
nil,
StringToUTF16Ptr(escapeAddQuotes(argv0)+" "+stringJoin(argv[1:], " ", escapeAddQuotes)),
nil, //ptr to struct lpProcessAttributes
nil, //ptr to struct lpThreadAttributes
true, //bInheritHandles
CREATE_UNICODE_ENVIRONMENT, //Flags
createEnvBlock(envv), //env block, NULL uses parent env
StringToUTF16Ptr(dir),
startupInfo,
processInfo)
if err != 0 {
pid = int(processInfo.ProcessId)
handle = int(processInfo.Process)
CloseHandle(processInfo.Thread)
}
return
}
// Ordinary exec.
func Exec(argv0 string, argv []string, envv []string) (err int) {
return EWINDOWS
}
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