Add an ExecuteNoWait interface to support asynchronous process spawning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75055 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Program.inc b/lib/System/Win32/Program.inc
index 49086b8..71f686c 100644
--- a/lib/System/Win32/Program.inc
+++ b/lib/System/Win32/Program.inc
@@ -303,6 +303,171 @@
return status;
}
+void
+Program::ExecuteNoWait(const Path& path,
+ const char** args,
+ const char** envp,
+ const Path** redirects,
+ unsigned memoryLimit,
+ std::string* ErrMsg) {
+ if (!path.canExecute()) {
+ if (ErrMsg)
+ *ErrMsg = "program not executable";
+ return;
+ }
+
+ // Windows wants a command line, not an array of args, to pass to the new
+ // process. We have to concatenate them all, while quoting the args that
+ // have embedded spaces.
+
+ // First, determine the length of the command line.
+ unsigned len = 0;
+ for (unsigned i = 0; args[i]; i++) {
+ len += strlen(args[i]) + 1;
+ if (strchr(args[i], ' '))
+ len += 2;
+ }
+
+ // Now build the command line.
+ char *command = reinterpret_cast<char *>(_alloca(len+1));
+ char *p = command;
+
+ for (unsigned i = 0; args[i]; i++) {
+ const char *arg = args[i];
+ size_t len = strlen(arg);
+ bool needsQuoting = strchr(arg, ' ') != 0;
+ if (needsQuoting)
+ *p++ = '"';
+ memcpy(p, arg, len);
+ p += len;
+ if (needsQuoting)
+ *p++ = '"';
+ *p++ = ' ';
+ }
+
+ *p = 0;
+
+ // The pointer to the environment block for the new process.
+ char *envblock = 0;
+
+ if (envp) {
+ // An environment block consists of a null-terminated block of
+ // null-terminated strings. Convert the array of environment variables to
+ // an environment block by concatenating them.
+
+ // First, determine the length of the environment block.
+ len = 0;
+ for (unsigned i = 0; envp[i]; i++)
+ len += strlen(envp[i]) + 1;
+
+ // Now build the environment block.
+ envblock = reinterpret_cast<char *>(_alloca(len+1));
+ p = envblock;
+
+ for (unsigned i = 0; envp[i]; i++) {
+ const char *ev = envp[i];
+ size_t len = strlen(ev) + 1;
+ memcpy(p, ev, len);
+ p += len;
+ }
+
+ *p = 0;
+ }
+
+ // Create a child process.
+ STARTUPINFO si;
+ memset(&si, 0, sizeof(si));
+ si.cb = sizeof(si);
+ si.hStdInput = INVALID_HANDLE_VALUE;
+ si.hStdOutput = INVALID_HANDLE_VALUE;
+ si.hStdError = INVALID_HANDLE_VALUE;
+
+ if (redirects) {
+ si.dwFlags = STARTF_USESTDHANDLES;
+
+ si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
+ if (si.hStdInput == INVALID_HANDLE_VALUE) {
+ MakeErrMsg(ErrMsg, "can't redirect stdin");
+ return;
+ }
+ si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
+ if (si.hStdOutput == INVALID_HANDLE_VALUE) {
+ CloseHandle(si.hStdInput);
+ MakeErrMsg(ErrMsg, "can't redirect stdout");
+ return;
+ }
+ if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
+ // If stdout and stderr should go to the same place, redirect stderr
+ // to the handle already open for stdout.
+ DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
+ GetCurrentProcess(), &si.hStdError,
+ 0, TRUE, DUPLICATE_SAME_ACCESS);
+ } else {
+ // Just redirect stderr
+ si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
+ if (si.hStdError == INVALID_HANDLE_VALUE) {
+ CloseHandle(si.hStdInput);
+ CloseHandle(si.hStdOutput);
+ MakeErrMsg(ErrMsg, "can't redirect stderr");
+ return;
+ }
+ }
+ }
+
+ PROCESS_INFORMATION pi;
+ memset(&pi, 0, sizeof(pi));
+
+ fflush(stdout);
+ fflush(stderr);
+ BOOL rc = CreateProcess(path.c_str(), command, NULL, NULL, TRUE, 0,
+ envblock, NULL, &si, &pi);
+ DWORD err = GetLastError();
+
+ // Regardless of whether the process got created or not, we are done with
+ // the handles we created for it to inherit.
+ CloseHandle(si.hStdInput);
+ CloseHandle(si.hStdOutput);
+ CloseHandle(si.hStdError);
+
+ // Now return an error if the process didn't get created.
+ if (!rc)
+ {
+ SetLastError(err);
+ MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
+ path.toString() + "'");
+ return;
+ }
+
+ // Make sure these get closed no matter what.
+ AutoHandle hProcess(pi.hProcess);
+ AutoHandle hThread(pi.hThread);
+
+ // Assign the process to a job if a memory limit is defined.
+ AutoHandle hJob(0);
+ if (memoryLimit != 0) {
+ hJob = CreateJobObject(0, 0);
+ bool success = false;
+ if (hJob != 0) {
+ JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
+ memset(&jeli, 0, sizeof(jeli));
+ jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
+ jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
+ if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
+ &jeli, sizeof(jeli))) {
+ if (AssignProcessToJobObject(hJob, pi.hProcess))
+ success = true;
+ }
+ }
+ if (!success) {
+ SetLastError(GetLastError());
+ MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
+ TerminateProcess(pi.hProcess, 1);
+ WaitForSingleObject(pi.hProcess, INFINITE);
+ return;
+ }
+ }
+}
+
bool Program::ChangeStdinToBinary(){
int result = _setmode( _fileno(stdin), _O_BINARY );
return result == -1;