llvm-6502/lib/System/Win32/Program.inc

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//===- Win32/Program.cpp - Win32 Program Implementation ------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Jeff Cohen and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Program class.
//
//===----------------------------------------------------------------------===//
#include "Win32.h"
#include <malloc.h>
#include <io.h>
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code
//===----------------------------------------------------------------------===//
namespace llvm {
using namespace sys;
// This function just uses the PATH environment variable to find the program.
Path
Program::FindProgramByName(const std::string& progName) {
// Check some degenerate cases
if (progName.length() == 0) // no program
return Path();
Path temp;
if (!temp.set(progName)) // invalid name
return Path();
if (temp.canExecute()) // already executable as is
return temp;
// At this point, the file name is valid and its not executable.
// Let Windows search for it.
char buffer[MAX_PATH];
char *dummy = NULL;
DWORD len = SearchPath(NULL, progName.c_str(), ".exe", MAX_PATH,
buffer, &dummy);
// See if it wasn't found.
if (len == 0)
return Path();
// See if we got the entire path.
if (len < MAX_PATH)
return Path(buffer);
// Buffer was too small; grow and retry.
while (true) {
char *b = reinterpret_cast<char *>(_alloca(len+1));
DWORD len2 = SearchPath(NULL, progName.c_str(), ".exe", len+1, b, &dummy);
// It is unlikely the search failed, but it's always possible some file
// was added or removed since the last search, so be paranoid...
if (len2 == 0)
return Path();
else if (len2 <= len)
return Path(b);
len = len2;
}
}
static HANDLE RedirectIO(const Path *path, int fd) {
HANDLE h;
if (path == 0) {
DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
GetCurrentProcess(), &h,
0, TRUE, DUPLICATE_SAME_ACCESS);
return h;
}
const char *fname = path->toString().c_str();
if (*fname == 0)
fname = "NUL";
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
h = CreateFile(fname, fd ? GENERIC_WRITE : GENERIC_READ, FILE_SHARE_READ,
&sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
ThrowError(std::string(fname) + ": Can't open file for " +
(fd ? "input: " : "output: "));
}
return h;
}
int
Program::ExecuteAndWait(const Path& path,
const char** args,
const char** envp,
const Path** redirects,
unsigned secondsToWait) {
if (!path.canExecute())
throw path.toString() + " is not executable";
// 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));
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;
// 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;
try {
si.hStdInput = RedirectIO(redirects[0], 0);
si.hStdOutput = RedirectIO(redirects[1], 1);
if (redirects[1] && redirects[2] && *(redirects[1]) != *(redirects[2])) {
si.hStdError = RedirectIO(redirects[2], 2);
} else {
DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
GetCurrentProcess(), &si.hStdError,
0, TRUE, DUPLICATE_SAME_ACCESS);
}
} catch (...) {
CloseHandle(si.hStdInput);
CloseHandle(si.hStdOutput);
CloseHandle(si.hStdError);
throw;
}
}
PROCESS_INFORMATION pi;
memset(&pi, 0, sizeof(pi));
fflush(stdout);
fflush(stderr);
BOOL rc = CreateProcess(path.c_str(), command, NULL, NULL, FALSE, 0,
envp, 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 throw an error if the process didn't get created.
if (!rc)
{
SetLastError(err);
ThrowError(std::string("Couldn't execute program '") +
path.toString() + "'");
}
// Wait for it to terminate.
DWORD millisecondsToWait = INFINITE;
if (secondsToWait > 0)
millisecondsToWait = secondsToWait * 1000;
if (WaitForSingleObject(pi.hProcess, millisecondsToWait) == WAIT_TIMEOUT) {
if (!TerminateProcess(pi.hProcess, 1)) {
ThrowError(std::string("Failed to terminate timed-out program '") +
path.toString() + "'");
}
WaitForSingleObject(pi.hProcess, INFINITE);
}
// Get its exit status.
DWORD status;
rc = GetExitCodeProcess(pi.hProcess, &status);
err = GetLastError();
// Done with the handles; go close them.
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
if (!rc) {
SetLastError(err);
ThrowError(std::string("Failed getting status for program '") +
path.toString() + "'");
}
return status;
}
}