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388 lines
11 KiB
C++
388 lines
11 KiB
C++
//===- Win32/Program.cpp - Win32 Program Implementation ------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the Win32 specific implementation of the Program class.
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//
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//===----------------------------------------------------------------------===//
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#include "Win32.h"
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#include <cstdio>
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#include <malloc.h>
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#include <io.h>
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#include <fcntl.h>
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only Win32 specific code
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//=== and must not be UNIX code
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//===----------------------------------------------------------------------===//
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namespace {
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struct Win32ProcessInfo {
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HANDLE hProcess;
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DWORD dwProcessId;
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};
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}
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namespace llvm {
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using namespace sys;
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Program::Program() : Data_(0) {}
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Program::~Program() {
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if (Data_) {
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Win32ProcessInfo* wpi = reinterpret_cast<Win32ProcessInfo*>(Data_);
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CloseHandle(wpi->hProcess);
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delete wpi;
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Data_ = 0;
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}
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}
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unsigned Program::GetPid() const {
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Win32ProcessInfo* wpi = reinterpret_cast<Win32ProcessInfo*>(Data_);
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return wpi->dwProcessId;
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}
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// This function just uses the PATH environment variable to find the program.
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Path
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Program::FindProgramByName(const std::string& progName) {
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// Check some degenerate cases
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if (progName.length() == 0) // no program
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return Path();
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Path temp;
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if (!temp.set(progName)) // invalid name
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return Path();
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if (temp.canExecute()) // already executable as is
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return temp;
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// At this point, the file name is valid and its not executable.
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// Let Windows search for it.
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char buffer[MAX_PATH];
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char *dummy = NULL;
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DWORD len = SearchPath(NULL, progName.c_str(), ".exe", MAX_PATH,
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buffer, &dummy);
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// See if it wasn't found.
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if (len == 0)
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return Path();
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// See if we got the entire path.
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if (len < MAX_PATH)
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return Path(buffer);
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// Buffer was too small; grow and retry.
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while (true) {
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char *b = reinterpret_cast<char *>(_alloca(len+1));
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DWORD len2 = SearchPath(NULL, progName.c_str(), ".exe", len+1, b, &dummy);
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// It is unlikely the search failed, but it's always possible some file
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// was added or removed since the last search, so be paranoid...
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if (len2 == 0)
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return Path();
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else if (len2 <= len)
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return Path(b);
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len = len2;
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}
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}
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static HANDLE RedirectIO(const Path *path, int fd, std::string* ErrMsg) {
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HANDLE h;
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if (path == 0) {
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DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
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GetCurrentProcess(), &h,
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0, TRUE, DUPLICATE_SAME_ACCESS);
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return h;
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}
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const char *fname;
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if (path->isEmpty())
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fname = "NUL";
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else
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fname = path->c_str();
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SECURITY_ATTRIBUTES sa;
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sa.nLength = sizeof(sa);
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sa.lpSecurityDescriptor = 0;
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sa.bInheritHandle = TRUE;
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h = CreateFile(fname, fd ? GENERIC_WRITE : GENERIC_READ, FILE_SHARE_READ,
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&sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL, NULL);
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if (h == INVALID_HANDLE_VALUE) {
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MakeErrMsg(ErrMsg, std::string(fname) + ": Can't open file for " +
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(fd ? "input: " : "output: "));
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}
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return h;
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}
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#ifdef __MINGW32__
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// Due to unknown reason, mingw32's w32api doesn't have this declaration.
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extern "C"
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BOOL WINAPI SetInformationJobObject(HANDLE hJob,
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JOBOBJECTINFOCLASS JobObjectInfoClass,
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LPVOID lpJobObjectInfo,
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DWORD cbJobObjectInfoLength);
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#endif
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/// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
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/// CreateProcess.
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static bool ArgNeedsQuotes(const char *Str) {
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return Str[0] == '\0' || strchr(Str, ' ') != 0;
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}
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bool
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Program::Execute(const Path& path,
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const char** args,
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const char** envp,
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const Path** redirects,
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unsigned memoryLimit,
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std::string* ErrMsg) {
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if (Data_) {
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Win32ProcessInfo* wpi = reinterpret_cast<Win32ProcessInfo*>(Data_);
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CloseHandle(wpi->hProcess);
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delete wpi;
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Data_ = 0;
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}
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if (!path.canExecute()) {
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if (ErrMsg)
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*ErrMsg = "program not executable";
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return false;
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}
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// Windows wants a command line, not an array of args, to pass to the new
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// process. We have to concatenate them all, while quoting the args that
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// have embedded spaces (or are empty).
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// First, determine the length of the command line.
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unsigned len = 0;
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for (unsigned i = 0; args[i]; i++) {
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len += strlen(args[i]) + 1;
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if (ArgNeedsQuotes(args[i]))
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len += 2;
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}
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// Now build the command line.
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char *command = reinterpret_cast<char *>(_alloca(len+1));
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char *p = command;
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for (unsigned i = 0; args[i]; i++) {
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const char *arg = args[i];
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size_t len = strlen(arg);
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bool needsQuoting = ArgNeedsQuotes(arg);
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if (needsQuoting)
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*p++ = '"';
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memcpy(p, arg, len);
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p += len;
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if (needsQuoting)
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*p++ = '"';
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*p++ = ' ';
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}
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*p = 0;
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// The pointer to the environment block for the new process.
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char *envblock = 0;
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if (envp) {
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// An environment block consists of a null-terminated block of
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// null-terminated strings. Convert the array of environment variables to
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// an environment block by concatenating them.
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// First, determine the length of the environment block.
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len = 0;
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for (unsigned i = 0; envp[i]; i++)
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len += strlen(envp[i]) + 1;
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// Now build the environment block.
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envblock = reinterpret_cast<char *>(_alloca(len+1));
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p = envblock;
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for (unsigned i = 0; envp[i]; i++) {
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const char *ev = envp[i];
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size_t len = strlen(ev) + 1;
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memcpy(p, ev, len);
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p += len;
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}
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*p = 0;
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}
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// Create a child process.
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STARTUPINFO si;
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memset(&si, 0, sizeof(si));
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si.cb = sizeof(si);
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si.hStdInput = INVALID_HANDLE_VALUE;
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si.hStdOutput = INVALID_HANDLE_VALUE;
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si.hStdError = INVALID_HANDLE_VALUE;
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if (redirects) {
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si.dwFlags = STARTF_USESTDHANDLES;
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si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
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if (si.hStdInput == INVALID_HANDLE_VALUE) {
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MakeErrMsg(ErrMsg, "can't redirect stdin");
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return false;
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}
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si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
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if (si.hStdOutput == INVALID_HANDLE_VALUE) {
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CloseHandle(si.hStdInput);
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MakeErrMsg(ErrMsg, "can't redirect stdout");
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return false;
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}
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if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
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// If stdout and stderr should go to the same place, redirect stderr
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// to the handle already open for stdout.
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DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
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GetCurrentProcess(), &si.hStdError,
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0, TRUE, DUPLICATE_SAME_ACCESS);
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} else {
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// Just redirect stderr
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si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
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if (si.hStdError == INVALID_HANDLE_VALUE) {
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CloseHandle(si.hStdInput);
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CloseHandle(si.hStdOutput);
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MakeErrMsg(ErrMsg, "can't redirect stderr");
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return false;
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}
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}
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}
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PROCESS_INFORMATION pi;
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memset(&pi, 0, sizeof(pi));
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fflush(stdout);
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fflush(stderr);
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BOOL rc = CreateProcess(path.c_str(), command, NULL, NULL, TRUE, 0,
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envblock, NULL, &si, &pi);
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DWORD err = GetLastError();
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// Regardless of whether the process got created or not, we are done with
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// the handles we created for it to inherit.
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CloseHandle(si.hStdInput);
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CloseHandle(si.hStdOutput);
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CloseHandle(si.hStdError);
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// Now return an error if the process didn't get created.
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if (!rc) {
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SetLastError(err);
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MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
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path.str() + "'");
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return false;
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}
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Win32ProcessInfo* wpi = new Win32ProcessInfo;
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wpi->hProcess = pi.hProcess;
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wpi->dwProcessId = pi.dwProcessId;
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Data_ = wpi;
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// Make sure these get closed no matter what.
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AutoHandle hThread(pi.hThread);
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// Assign the process to a job if a memory limit is defined.
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AutoHandle hJob(0);
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if (memoryLimit != 0) {
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hJob = CreateJobObject(0, 0);
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bool success = false;
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if (hJob != 0) {
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JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
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memset(&jeli, 0, sizeof(jeli));
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jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
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jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
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if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
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&jeli, sizeof(jeli))) {
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if (AssignProcessToJobObject(hJob, pi.hProcess))
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success = true;
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}
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}
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if (!success) {
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SetLastError(GetLastError());
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MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
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TerminateProcess(pi.hProcess, 1);
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WaitForSingleObject(pi.hProcess, INFINITE);
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return false;
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}
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}
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return true;
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}
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int
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Program::Wait(unsigned secondsToWait,
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std::string* ErrMsg) {
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if (Data_ == 0) {
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MakeErrMsg(ErrMsg, "Process not started!");
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return -1;
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}
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Win32ProcessInfo* wpi = reinterpret_cast<Win32ProcessInfo*>(Data_);
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HANDLE hProcess = wpi->hProcess;
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// Wait for the process to terminate.
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DWORD millisecondsToWait = INFINITE;
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if (secondsToWait > 0)
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millisecondsToWait = secondsToWait * 1000;
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if (WaitForSingleObject(hProcess, millisecondsToWait) == WAIT_TIMEOUT) {
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if (!TerminateProcess(hProcess, 1)) {
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MakeErrMsg(ErrMsg, "Failed to terminate timed-out program.");
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return -1;
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}
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WaitForSingleObject(hProcess, INFINITE);
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}
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// Get its exit status.
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DWORD status;
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BOOL rc = GetExitCodeProcess(hProcess, &status);
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DWORD err = GetLastError();
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if (!rc) {
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SetLastError(err);
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MakeErrMsg(ErrMsg, "Failed getting status for program.");
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return -1;
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}
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return status;
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}
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bool
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Program::Kill(std::string* ErrMsg) {
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if (Data_ == 0) {
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MakeErrMsg(ErrMsg, "Process not started!");
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return true;
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}
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Win32ProcessInfo* wpi = reinterpret_cast<Win32ProcessInfo*>(Data_);
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HANDLE hProcess = wpi->hProcess;
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if (TerminateProcess(hProcess, 1) == 0) {
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MakeErrMsg(ErrMsg, "The process couldn't be killed!");
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return true;
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}
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return false;
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}
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bool Program::ChangeStdinToBinary(){
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int result = _setmode( _fileno(stdin), _O_BINARY );
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return result == -1;
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}
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bool Program::ChangeStdoutToBinary(){
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int result = _setmode( _fileno(stdout), _O_BINARY );
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return result == -1;
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}
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bool Program::ChangeStderrToBinary(){
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int result = _setmode( _fileno(stderr), _O_BINARY );
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return result == -1;
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}
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}
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