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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50659 91177308-0d34-0410-b5e6-96231b3b80d8
289 lines
7.8 KiB
C++
289 lines
7.8 KiB
C++
//===- llvm/System/Unix/Program.cpp -----------------------------*- 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 implements the Unix specific portion of the Program class.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include <llvm/Config/config.h>
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#include "Unix.h"
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#include <iostream>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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namespace llvm {
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using namespace sys;
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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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// FIXME: have to check for absolute filename - we cannot assume anything
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// about "." being in $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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// Get the path. If its empty, we can't do anything to find it.
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const char *PathStr = getenv("PATH");
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if (PathStr == 0)
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return Path();
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// Now we have a colon separated list of directories to search; try them.
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size_t 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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Path FilePath;
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if (FilePath.set(std::string(PathStr,Colon))) {
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FilePath.appendComponent(progName);
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if (FilePath.canExecute())
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return FilePath; // Found the executable!
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}
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// Nope it wasn't in this directory, check the next path in the list!
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PathLen -= Colon-PathStr;
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PathStr = Colon;
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// Advance past duplicate colons
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while (*PathStr == ':') {
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PathStr++;
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PathLen--;
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}
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}
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return Path();
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}
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static bool RedirectFD(const std::string &File, int FD, std::string* ErrMsg) {
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if (File.empty()) return false; // 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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MakeErrMsg(ErrMsg, "Cannot open file '" + File + "' for "
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+ (FD == 0 ? "input" : "output") + "!\n");
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return true;
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}
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// Install it as the requested FD
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if (-1 == dup2(InFD, FD)) {
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MakeErrMsg(ErrMsg, "Cannot dup2");
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return true;
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}
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close(InFD); // Close the original FD
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return false;
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}
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static bool Timeout = false;
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static void TimeOutHandler(int Sig) {
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Timeout = true;
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}
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static void SetMemoryLimits (unsigned size)
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{
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#if HAVE_SYS_RESOURCE_H
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struct rlimit r;
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__typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
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// Heap size
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getrlimit (RLIMIT_DATA, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_DATA, &r);
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#ifdef RLIMIT_RSS
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// Resident set size.
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getrlimit (RLIMIT_RSS, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_RSS, &r);
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#endif
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#ifdef RLIMIT_AS // e.g. NetBSD doesn't have it.
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// Virtual memory.
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getrlimit (RLIMIT_AS, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_AS, &r);
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#endif
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#endif
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}
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int
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Program::ExecuteAndWait(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 secondsToWait,
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unsigned memoryLimit,
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std::string* ErrMsg)
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{
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if (!path.canExecute()) {
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if (ErrMsg)
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*ErrMsg = path.toString() + " is not executable";
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return -1;
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}
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#ifdef HAVE_SYS_WAIT_H
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// Create a child process.
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int child = fork();
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switch (child) {
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// An error occured: Return to the caller.
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case -1:
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MakeErrMsg(ErrMsg, "Couldn't fork");
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return -1;
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// Child process: Execute the program.
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case 0: {
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// Redirect file descriptors...
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if (redirects) {
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if (redirects[0]) {
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if (redirects[0]->isEmpty()) {
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if (RedirectFD("/dev/null",0,ErrMsg)) { return -1; }
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} else {
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if (RedirectFD(redirects[0]->toString(), 0,ErrMsg)) { return -1; }
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}
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}
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if (redirects[1]) {
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if (redirects[1]->isEmpty()) {
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if (RedirectFD("/dev/null",1,ErrMsg)) { return -1; }
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} else {
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if (RedirectFD(redirects[1]->toString(),1,ErrMsg)) { return -1; }
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}
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}
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if (redirects[1] && redirects[2] &&
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*(redirects[1]) != *(redirects[2])) {
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if (redirects[2]->isEmpty()) {
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if (RedirectFD("/dev/null",2,ErrMsg)) { return -1; }
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} else {
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if (RedirectFD(redirects[2]->toString(), 2,ErrMsg)) { return -1; }
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}
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} else if (-1 == dup2(1,2)) {
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MakeErrMsg(ErrMsg, "Can't redirect");
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return -1;
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}
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}
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// Set memory limits
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if (memoryLimit!=0) {
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SetMemoryLimits(memoryLimit);
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}
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// Execute!
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if (envp != 0)
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execve (path.c_str(), (char**)args, (char**)envp);
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else
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execv (path.c_str(), (char**)args);
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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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exit (errno);
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}
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// Parent process: Break out of the switch to do our processing.
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default:
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break;
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}
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// Make sure stderr and stdout have been flushed
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std::cerr << std::flush;
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std::cout << std::flush;
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fsync(1);
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fsync(2);
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struct sigaction Act, Old;
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// Install a timeout handler.
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if (secondsToWait) {
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Timeout = false;
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Act.sa_sigaction = 0;
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Act.sa_handler = TimeOutHandler;
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sigemptyset(&Act.sa_mask);
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Act.sa_flags = 0;
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sigaction(SIGALRM, &Act, &Old);
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alarm(secondsToWait);
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}
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// Parent process: Wait for the child process to terminate.
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int status;
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while (wait(&status) != child)
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if (secondsToWait && errno == EINTR) {
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// Kill the child.
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kill(child, SIGKILL);
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// Turn off the alarm and restore the signal handler
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alarm(0);
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sigaction(SIGALRM, &Old, 0);
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// Wait for child to die
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if (wait(&status) != child)
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MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
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else
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MakeErrMsg(ErrMsg, "Child timed out", 0);
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return -1; // Timeout detected
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} else if (errno != EINTR) {
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MakeErrMsg(ErrMsg, "Error waiting for child process");
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return -1;
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}
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// We exited normally without timeout, so turn off the timer.
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if (secondsToWait) {
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alarm(0);
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sigaction(SIGALRM, &Old, 0);
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}
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// Return the proper exit status. 0=success, >0 is programs' exit status,
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// <0 means a signal was returned, -9999999 means the program dumped core.
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int result = 0;
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if (WIFEXITED(status))
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result = WEXITSTATUS(status);
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else if (WIFSIGNALED(status))
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result = 0 - WTERMSIG(status);
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#ifdef WCOREDUMP
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else if (WCOREDUMP(status))
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result |= 0x01000000;
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#endif
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return result;
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#else
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return -99;
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#endif
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}
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bool Program::ChangeStdinToBinary(){
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// Do nothing, as Unix doesn't differentiate between text and binary.
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return false;
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}
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bool Program::ChangeStdoutToBinary(){
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// Do nothing, as Unix doesn't differentiate between text and binary.
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return false;
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}
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}
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