2002-12-23 23:50:16 +00:00
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//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===//
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//
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// This file contains functions used to do a variety of low-level, often
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// system-specific, tasks.
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//
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//===----------------------------------------------------------------------===//
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#include "SystemUtils.h"
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#include <algorithm>
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#include <fstream>
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2002-12-24 00:44:34 +00:00
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#include <iostream>
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2003-01-29 18:15:34 +00:00
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#include <cstdlib>
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#include <alloca.h>
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2002-12-23 23:50:16 +00:00
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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/// removeFile - Delete the specified file
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///
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void removeFile(const std::string &Filename) {
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unlink(Filename.c_str());
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}
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/// getUniqueFilename - Return a filename with the specified prefix. If the
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/// file does not exist yet, return it, otherwise add a suffix to make it
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/// unique.
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///
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std::string getUniqueFilename(const std::string &FilenameBase) {
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if (!std::ifstream(FilenameBase.c_str()))
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return FilenameBase; // Couldn't open the file? Use it!
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// Create a pattern for mkstemp...
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char *FNBuffer = (char*)alloca(FilenameBase.size()+8);
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strcpy(FNBuffer, FilenameBase.c_str());
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strcpy(FNBuffer+FilenameBase.size(), "-XXXXXX");
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// Agree on a temporary file name to use....
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int TempFD;
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if ((TempFD = mkstemp(FNBuffer)) == -1) {
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std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current "
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<< " directory!\n";
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exit(1);
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}
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// We don't need to hold the temp file descriptor... we will trust that noone
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// will overwrite/delete the file while we are working on it...
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close(TempFD);
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return FNBuffer;
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}
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/// isExecutableFile - This function returns true if the filename specified
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/// exists and is executable.
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///
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bool isExecutableFile(const std::string &ExeFileName) {
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struct stat Buf;
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if (stat(ExeFileName.c_str(), &Buf))
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return false; // Must not be executable!
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if (!(Buf.st_mode & S_IFREG))
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return false; // Not a regular file?
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if (Buf.st_uid == getuid()) // Owner of file?
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return Buf.st_mode & S_IXUSR;
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else if (Buf.st_gid == getgid()) // In group of file?
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return Buf.st_mode & S_IXGRP;
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else // Unrelated to file?
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return Buf.st_mode & S_IXOTH;
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}
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// FindExecutable - Find a named executable, giving the argv[0] of bugpoint.
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// This assumes the executable is in the same directory as bugpoint itself.
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// If the executable cannot be found, return an empty string.
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//
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std::string FindExecutable(const std::string &ExeName,
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const std::string &BugPointPath) {
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// First check the directory that bugpoint is in. We can do this if
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// BugPointPath contains at least one / character, indicating that it is a
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// relative path to bugpoint itself.
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//
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std::string Result = BugPointPath;
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while (!Result.empty() && Result[Result.size()-1] != '/')
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Result.erase(Result.size()-1, 1);
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if (!Result.empty()) {
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Result += ExeName;
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if (isExecutableFile(Result)) return Result; // Found it?
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}
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// Okay, if the path to bugpoint didn't tell us anything, try using the PATH
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// environment variable.
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const char *PathStr = getenv("PATH");
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if (PathStr == 0) return "";
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// Now we have a colon seperated list of directories to search... try them...
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unsigned PathLen = strlen(PathStr);
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while (PathLen) {
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// Find the first colon...
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const char *Colon = std::find(PathStr, PathStr+PathLen, ':');
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// Check to see if this first directory contains the executable...
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std::string FilePath = std::string(PathStr, Colon) + '/' + ExeName;
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if (isExecutableFile(FilePath))
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return FilePath; // Found the executable!
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// Nope it wasn't in this directory, check the next range!
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PathLen -= Colon-PathStr;
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PathStr = Colon;
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while (*PathStr == ':') { // Advance past colons
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PathStr++;
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PathLen--;
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}
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}
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// If we fell out, we ran out of directories in PATH to search, return failure
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return "";
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}
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static void RedirectFD(const std::string &File, int FD) {
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if (File.empty()) return; // Noop
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// Open the file
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int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
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if (InFD == -1) {
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std::cerr << "Error opening file '" << File << "' for "
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<< (FD == 0 ? "input" : "output") << "!\n";
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exit(1);
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}
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dup2(InFD, FD); // Install it as the requested FD
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close(InFD); // Close the original FD
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}
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/// RunProgramWithTimeout - This function executes the specified program, with
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/// the specified null-terminated argument array, with the stdin/out/err fd's
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/// redirected, with a timeout specified on the commandline. This terminates
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/// the calling program if there is an error executing the specified program.
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/// It returns the return value of the program, or -1 if a timeout is detected.
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///
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int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args,
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const std::string &StdInFile,
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const std::string &StdOutFile,
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const std::string &StdErrFile) {
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// FIXME: install sigalarm handler here for timeout...
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int Child = fork();
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switch (Child) {
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case -1:
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std::cerr << "ERROR forking!\n";
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exit(1);
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case 0: // Child
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RedirectFD(StdInFile, 0); // Redirect file descriptors...
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RedirectFD(StdOutFile, 1);
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RedirectFD(StdErrFile, 2);
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execv(ProgramPath.c_str(), (char *const *)Args);
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std::cerr << "Error executing program '" << ProgramPath;
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for (; *Args; ++Args)
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std::cerr << " " << *Args;
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exit(1);
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default: break;
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}
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// Make sure all output has been written while waiting
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std::cout << std::flush;
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int Status;
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if (wait(&Status) != Child) {
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if (errno == EINTR) {
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static bool FirstTimeout = true;
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if (FirstTimeout) {
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std::cout <<
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"*** Program execution timed out! This mechanism is designed to handle\n"
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" programs stuck in infinite loops gracefully. The -timeout option\n"
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" can be used to change the timeout threshold or disable it completely\n"
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" (with -timeout=0). This message is only displayed once.\n";
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FirstTimeout = false;
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}
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return -1; // Timeout detected
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}
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std::cerr << "Error waiting for child process!\n";
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exit(1);
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}
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return Status;
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}
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