/* Smart recycling of pipe handles in [pHolder]. For the failed
create process attempts, both ends of pipe need to be released.
The [complete] has the [TRUE] value in the failed attempt. */
static void releaseHolder(BOOL complete, STDHOLDER *pHolder) {
closeSafely(pHolder->pipe[pHolder->offset]);
if (complete) {
/* Error occur, close this process pipe end */
closeSafely(pHolder->pipe[OPPOSITE_END(pHolder->offset)]);
}
}
JNIEXPORT jlong JNICALL
Java_java_lang_ProcessImpl_create(JNIEnv *env, jclass ignored,
jstring cmd,
jstring envBlock,
jstring dir,
jlongArray stdHandles,
jboolean redirectErrorStream)
{
HANDLE inRead = INVALID_HANDLE_VALUE;
HANDLE inWrite = INVALID_HANDLE_VALUE;
HANDLE outRead = INVALID_HANDLE_VALUE;
HANDLE outWrite = INVALID_HANDLE_VALUE;
HANDLE errRead = INVALID_HANDLE_VALUE;
HANDLE errWrite = INVALID_HANDLE_VALUE;
SECURITY_ATTRIBUTES sa;
PROCESS_INFORMATION pi;
STARTUPINFO si;
LPTSTR pcmd = NULL;
LPCTSTR pdir = NULL;
LPVOID penvBlock = NULL;
jlong *handles = NULL;
jlong ret = 0;
OSVERSIONINFO ver;
jboolean onNT = JNI_FALSE;
DWORD processFlag;
ver.dwOSVersionInfoSize = sizeof(ver);
GetVersionEx(&ver);
if (ver.dwPlatformId == VER_PLATFORM_WIN32_NT)
onNT = JNI_TRUE;
assert(cmd != NULL);
pcmd = (LPTSTR) JNU_GetStringPlatformChars(env, cmd, NULL);
if (pcmd == NULL) goto Catch;
if (dir != 0) {
pdir = (LPCTSTR) JNU_GetStringPlatformChars(env, dir, NULL);
if (pdir == NULL) goto Catch;
pdir = (LPCTSTR) JVM_NativePath((char *)pdir);
}
if (envBlock != NULL) {
penvBlock = onNT
? (LPVOID) ((*env)->GetStringChars(env, envBlock, NULL))
: (LPVOID) JNU_GetStringPlatformChars(env, envBlock, NULL);
if (penvBlock == NULL) goto Catch;
}
assert(stdHandles != NULL);
handles = (*env)->GetLongArrayElements(env, stdHandles, NULL);
if (handles == NULL) goto Catch;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
if (handles[0] != (jlong) -1) {
si.hStdInput = (HANDLE) handles[0];
handles[0] = (jlong) -1;
} else {
if (! CreatePipe(&inRead, &inWrite, &sa, PIPE_SIZE)) {
win32Error(env, "CreatePipe");
goto Catch;
}
si.hStdInput = inRead;
SetHandleInformation(inWrite, HANDLE_FLAG_INHERIT, FALSE);
handles[0] = (jlong) inWrite;
}
SetHandleInformation(si.hStdInput, HANDLE_FLAG_INHERIT, TRUE);
if (handles[1] != (jlong) -1) {
si.hStdOutput = (HANDLE) handles[1];
handles[1] = (jlong) -1;
} else {
if (! CreatePipe(&outRead, &outWrite, &sa, PIPE_SIZE)) {
win32Error(env, "CreatePipe");
goto Catch;
}
si.hStdOutput = outWrite;
SetHandleInformation(outRead, HANDLE_FLAG_INHERIT, FALSE);
handles[1] = (jlong) outRead;
}
SetHandleInformation(si.hStdOutput, HANDLE_FLAG_INHERIT, TRUE);
if (redirectErrorStream) {
si.hStdError = si.hStdOutput;
handles[2] = (jlong) -1;
} else if (handles[2] != (jlong) -1) {
si.hStdError = (HANDLE) handles[2];
handles[2] = (jlong) -1;
} else {
if (! CreatePipe(&errRead, &errWrite, &sa, PIPE_SIZE)) {
win32Error(env, "CreatePipe");
goto Catch;
}
si.hStdError = errWrite;
SetHandleInformation(errRead, HANDLE_FLAG_INHERIT, FALSE);
handles[2] = (jlong) errRead;
}
SetHandleInformation(si.hStdError, HANDLE_FLAG_INHERIT, TRUE);
if (onNT)
processFlag = CREATE_NO_WINDOW | CREATE_UNICODE_ENVIRONMENT;
else
processFlag = selectProcessFlag(env, cmd);
/* Java and Windows are both pure Unicode systems at heart.
* Windows has both a legacy byte-based API and a 16-bit Unicode
* "W" API. The Right Thing here is to call CreateProcessW, since
* that will allow all process-related information like command
* line arguments to be passed properly to the child. We don't do
* that currently, since we would first have to have "W" versions
* of JVM_NativePath and perhaps other functions. In the
* meantime, we can call CreateProcess with the magic flag
* CREATE_UNICODE_ENVIRONMENT, which passes only the environment
* in "W" mode. We will fix this later. */
ret = CreateProcess(0, /* executable name */
pcmd, /* command line */
0, /* process security attribute */
0, /* thread security attribute */
TRUE, /* inherits system handles */
processFlag, /* selected based on exe type */
penvBlock, /* environment block */
pdir, /* change to the new current directory */
&si, /* (in) startup information */
&pi); /* (out) process information */
if (!ret) {
win32Error(env, "CreateProcess");
goto Catch;
}
CloseHandle(pi.hThread);
ret = (jlong)pi.hProcess;
Finally:
/* Always clean up the child's side of the pipes */
closeSafely(inRead);
closeSafely(outWrite);
closeSafely(errWrite);
if (pcmd != NULL)
JNU_ReleaseStringPlatformChars(env, cmd, (char *) pcmd);
if (pdir != NULL)
JNU_ReleaseStringPlatformChars(env, dir, (char *) pdir);
if (penvBlock != NULL) {
if (onNT)
(*env)->ReleaseStringChars(env, envBlock, (jchar *) penvBlock);
else
JNU_ReleaseStringPlatformChars(env, dir, (char *) penvBlock);
}
if (handles != NULL)
(*env)->ReleaseLongArrayElements(env, stdHandles, handles, 0);
return ret;
Catch:
/* Clean up the parent's side of the pipes in case of failure only */
closeSafely(inWrite);
closeSafely(outRead);
closeSafely(errRead);
goto Finally;
}
/* Please, read about the MS inheritance problem
http://support.microsoft.com/kb/315939
and critical section/synchronized block solution. */
static jlong processCreate(
JNIEnv *env,
const jchar *pcmd,
const jchar *penvBlock,
const jchar *pdir,
jlong *handles,
jboolean redirectErrorStream)
{
jlong ret = 0L;
STARTUPINFOW si = {sizeof(si)};
/* Handles for which the inheritance flag must be restored. */
HANDLE stdIOE[HANDLE_STORAGE_SIZE] = {
/* Current process standard IOE handles: JDK-7147084 */
INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE,
/* Child process IOE handles: JDK-6921885 */
(HANDLE)handles[0], (HANDLE)handles[1], (HANDLE)handles[2]};
BOOL inherit[HANDLE_STORAGE_SIZE] = {
FALSE, FALSE, FALSE,
FALSE, FALSE, FALSE};
{
/* Extraction of current process standard IOE handles */
DWORD idsIOE[3] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, STD_ERROR_HANDLE};
int i;
for (i = 0; i < 3; ++i)
/* Should not be closed by CloseHandle! */
stdIOE[i] = GetStdHandle(idsIOE[i]);
}
prepareIOEHandleState(stdIOE, inherit);
{
/* Input */
STDHOLDER holderIn = {{INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE}, OFFSET_READ};
if (initHolder(env, &handles[0], &holderIn, &si.hStdInput)) {
/* Output */
STDHOLDER holderOut = {{INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE}, OFFSET_WRITE};
if (initHolder(env, &handles[1], &holderOut, &si.hStdOutput)) {
/* Error */
STDHOLDER holderErr = {{INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE}, OFFSET_WRITE};
BOOL success;
if (redirectErrorStream) {
si.hStdError = si.hStdOutput;
/* Here we set the error stream to [ProcessBuilder.NullInputStream.INSTANCE]
value. That is in accordance with Java Doc for the redirection case.
The Java file for the [ handles[2] ] will be closed in ANY case. It is not
a handle leak. */
handles[2] = JAVA_INVALID_HANDLE_VALUE;
success = TRUE;
} else {
success = initHolder(env, &handles[2], &holderErr, &si.hStdError);
}
if (success) {
PROCESS_INFORMATION pi;
DWORD processFlag = CREATE_UNICODE_ENVIRONMENT;
/* Suppress popping-up of a console window for non-console applications */
if (GetConsoleWindow() == NULL)
processFlag |= CREATE_NO_WINDOW;
si.dwFlags = STARTF_USESTDHANDLES;
if (!CreateProcessW(
NULL, /* executable name */
(LPWSTR)pcmd, /* command line */
NULL, /* process security attribute */
NULL, /* thread security attribute */
TRUE, /* inherits system handles */
processFlag, /* selected based on exe type */
(LPVOID)penvBlock,/* environment block */
(LPCWSTR)pdir, /* change to the new current directory */
&si, /* (in) startup information */
&pi)) /* (out) process information */
{
win32Error(env, L"CreateProcess");
} else {
closeSafely(pi.hThread);
ret = (jlong)pi.hProcess;
}
}
releaseHolder(ret == 0, &holderErr);
releaseHolder(ret == 0, &holderOut);
}
releaseHolder(ret == 0, &holderIn);
}
}
restoreIOEHandleState(stdIOE, inherit);
return ret;
}
