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https://github.com/c64scene-ar/llvm-6502.git
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07adb2836b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17498 91177308-0d34-0410-b5e6-96231b3b80d8
137 lines
4.1 KiB
C++
137 lines
4.1 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 was developed by Reid Spencer and is distributed under the
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// 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 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 <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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extern char** environ;
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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.setFile(progName)) // invalid name
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return Path();
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if (temp.executable()) // 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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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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Path FilePath;
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if (FilePath.setDirectory(std::string(PathStr,Colon))) {
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FilePath.appendFile(progName);
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if (FilePath.executable())
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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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//
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int
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Program::ExecuteAndWait(const Path& path,
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const std::vector<std::string>& args) {
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if (!path.executable())
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throw path.get() + " is not executable";
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#ifdef HAVE_SYS_WAIT_H
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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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const char* argv[ args.size() + 2 ];
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unsigned index = 0;
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std::string progname(path.getLast());
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argv[index++] = progname.c_str();
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for (unsigned i = 0; i < args.size(); i++)
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argv[index++] = args[i].c_str();
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argv[index] = 0;
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// Create a child process.
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switch (fork()) {
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// An error occured: Return to the caller.
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case -1:
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ThrowErrno(std::string("Couldn't execute program '") + path.get() + "'");
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break;
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// Child process: Execute the program.
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case 0:
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execve (path.c_str(), (char** const)argv, environ);
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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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// 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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// Parent process: Wait for the child process to terminate.
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int status;
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if ((::wait (&status)) == -1)
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ThrowErrno(std::string("Failed waiting for program '") + path.get() + "'");
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// If the program exited normally with a zero exit status, return success!
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if (WIFEXITED (status))
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return WEXITSTATUS(status);
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else if (WIFSIGNALED(status))
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throw std::string("Program '") + path.get() + "' received terminating signal.";
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else
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return 0;
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#else
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throw std::string("Program::ExecuteAndWait not implemented on this platform!\n");
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#endif
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}
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}
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// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab
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