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286 lines
8.5 KiB
C++
286 lines
8.5 KiB
C++
//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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 "Support/SystemUtils.h"
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#include "Config/sys/types.h"
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#include "Config/sys/stat.h"
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#include "Config/fcntl.h"
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#include "Config/sys/wait.h"
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#include "Config/unistd.h"
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#include "Config/config.h"
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#include <algorithm>
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#include <fstream>
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#include <iostream>
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#include <cstdlib>
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#include <cerrno>
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using namespace llvm;
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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 llvm::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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/// isStandardOutAConsole - Return true if we can tell that the standard output
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/// stream goes to a terminal window or console.
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bool llvm::isStandardOutAConsole() {
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#if HAVE_ISATTY
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return isatty(1);
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#endif
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// If we don't have isatty, just return false.
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return false;
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}
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/// FindExecutable - Find a named executable, giving the argv[0] of program
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/// being executed. This allows us to find another LLVM tool if it is built
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/// into the same directory, but that directory is neither the current
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/// directory, nor in the PATH. If the executable cannot be found, return an
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/// empty string.
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///
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std::string llvm::FindExecutable(const std::string &ExeName,
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const std::string &ProgramPath) {
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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 = ProgramPath;
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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 the program didn't tell us anything, try using the
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// PATH 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 separated 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 command line. 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 llvm::RunProgramWithTimeout(const std::string &ProgramPath,
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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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std::cerr << "'\n";
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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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//
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// Function: ExecWait ()
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//
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// Description:
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// This function executes a program with the specified arguments and
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// environment. It then waits for the progarm to termiante and then returns
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// to the caller.
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//
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// Inputs:
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// argv - The arguments to the program as an array of C strings. The first
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// argument should be the name of the program to execute, and the
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// last argument should be a pointer to NULL.
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//
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// envp - The environment passes to the program as an array of C strings in
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// the form of "name=value" pairs. The last element should be a
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// pointer to NULL.
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//
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// Outputs:
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// None.
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//
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// Return value:
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// 0 - No errors.
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// 1 - The program could not be executed.
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// 1 - The program returned a non-zero exit status.
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// 1 - The program terminated abnormally.
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//
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// Notes:
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// The program will inherit the stdin, stdout, and stderr file descriptors
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// as well as other various configuration settings (umask).
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//
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// This function should not print anything to stdout/stderr on its own. It is
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// a generic library function. The caller or executed program should report
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// errors in the way it sees fit.
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//
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// This function does not use $PATH to find programs.
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//
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int llvm::ExecWait(const char * const old_argv[],
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const char * const old_envp[]) {
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// Child process ID
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register int child;
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// Status from child process when it exits
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int status;
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//
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// Create local versions of the parameters that can be passed into execve()
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// without creating const problems.
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//
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char ** const argv = (char ** const) old_argv;
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char ** const envp = (char ** const) old_envp;
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//
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// Create a child process.
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//
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switch (child=fork())
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{
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//
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// An error occured: Return to the caller.
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//
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case -1:
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return 1;
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break;
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//
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// Child process: Execute the program.
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//
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case 0:
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execve (argv[0], argv, envp);
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//
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// If the execve() failed, we should exit and let the parent pick up
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// our non-zero exit status.
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//
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exit (1);
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break;
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//
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// Parent process: Break out of the switch to do our processing.
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//
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default:
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break;
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}
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//
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// Parent process: Wait for the child process to termiante.
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//
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if ((wait (&status)) == -1)
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{
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return 1;
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}
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//
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// If the program exited normally with a zero exit status, return success!
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//
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if (WIFEXITED (status) && (WEXITSTATUS(status) == 0))
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{
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return 0;
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}
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//
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// Otherwise, return failure.
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//
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return 1;
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}
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