mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 05:29:47 +00:00
Luis Felipe Strano Moraes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
429 lines
12 KiB
C++
429 lines
12 KiB
C++
//===- llvm/Support/Unix/Program.cpp -----------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the Unix specific portion of the Program class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//=== WARNING: Implementation here must contain only generic UNIX code that
|
|
//=== is guaranteed to work on *all* UNIX variants.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include <llvm/Config/config.h>
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "Unix.h"
|
|
#if HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
#if HAVE_SYS_RESOURCE_H
|
|
#include <sys/resource.h>
|
|
#endif
|
|
#if HAVE_SIGNAL_H
|
|
#include <signal.h>
|
|
#endif
|
|
#if HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif
|
|
#ifdef HAVE_POSIX_SPAWN
|
|
#include <spawn.h>
|
|
#if !defined(__APPLE__)
|
|
extern char **environ;
|
|
#else
|
|
#include <crt_externs.h> // _NSGetEnviron
|
|
#endif
|
|
#endif
|
|
|
|
namespace llvm {
|
|
using namespace sys;
|
|
|
|
Program::Program() : Data_(0) {}
|
|
|
|
Program::~Program() {}
|
|
|
|
unsigned Program::GetPid() const {
|
|
uint64_t pid = reinterpret_cast<uint64_t>(Data_);
|
|
return static_cast<unsigned>(pid);
|
|
}
|
|
|
|
// 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();
|
|
// Use the given path verbatim if it contains any slashes; this matches
|
|
// the behavior of sh(1) and friends.
|
|
if (progName.find('/') != std::string::npos)
|
|
return temp;
|
|
|
|
// At this point, the file name is valid and does not contain slashes. Search
|
|
// for it through the directories specified in the PATH environment variable.
|
|
|
|
// Get the path. If its empty, we can't do anything to find it.
|
|
const char *PathStr = getenv("PATH");
|
|
if (PathStr == 0)
|
|
return Path();
|
|
|
|
// Now we have a colon separated list of directories to search; try them.
|
|
size_t PathLen = strlen(PathStr);
|
|
while (PathLen) {
|
|
// Find the first colon...
|
|
const char *Colon = std::find(PathStr, PathStr+PathLen, ':');
|
|
|
|
// Check to see if this first directory contains the executable...
|
|
Path FilePath;
|
|
if (FilePath.set(std::string(PathStr,Colon))) {
|
|
FilePath.appendComponent(progName);
|
|
if (FilePath.canExecute())
|
|
return FilePath; // Found the executable!
|
|
}
|
|
|
|
// Nope it wasn't in this directory, check the next path in the list!
|
|
PathLen -= Colon-PathStr;
|
|
PathStr = Colon;
|
|
|
|
// Advance past duplicate colons
|
|
while (*PathStr == ':') {
|
|
PathStr++;
|
|
PathLen--;
|
|
}
|
|
}
|
|
return Path();
|
|
}
|
|
|
|
static bool RedirectIO(const Path *Path, int FD, std::string* ErrMsg) {
|
|
if (Path == 0) // Noop
|
|
return false;
|
|
const char *File;
|
|
if (Path->isEmpty())
|
|
// Redirect empty paths to /dev/null
|
|
File = "/dev/null";
|
|
else
|
|
File = Path->c_str();
|
|
|
|
// Open the file
|
|
int InFD = open(File, FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
|
|
if (InFD == -1) {
|
|
MakeErrMsg(ErrMsg, "Cannot open file '" + std::string(File) + "' for "
|
|
+ (FD == 0 ? "input" : "output"));
|
|
return true;
|
|
}
|
|
|
|
// Install it as the requested FD
|
|
if (dup2(InFD, FD) == -1) {
|
|
MakeErrMsg(ErrMsg, "Cannot dup2");
|
|
close(InFD);
|
|
return true;
|
|
}
|
|
close(InFD); // Close the original FD
|
|
return false;
|
|
}
|
|
|
|
#ifdef HAVE_POSIX_SPAWN
|
|
static bool RedirectIO_PS(const Path *Path, int FD, std::string *ErrMsg,
|
|
posix_spawn_file_actions_t *FileActions) {
|
|
if (Path == 0) // Noop
|
|
return false;
|
|
const char *File;
|
|
if (Path->isEmpty())
|
|
// Redirect empty paths to /dev/null
|
|
File = "/dev/null";
|
|
else
|
|
File = Path->c_str();
|
|
|
|
if (int Err = posix_spawn_file_actions_addopen(FileActions, FD,
|
|
File, FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666))
|
|
return MakeErrMsg(ErrMsg, "Cannot dup2", Err);
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static void TimeOutHandler(int Sig) {
|
|
}
|
|
|
|
static void SetMemoryLimits (unsigned size)
|
|
{
|
|
#if HAVE_SYS_RESOURCE_H && HAVE_GETRLIMIT && HAVE_SETRLIMIT
|
|
struct rlimit r;
|
|
__typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
|
|
|
|
// Heap size
|
|
getrlimit (RLIMIT_DATA, &r);
|
|
r.rlim_cur = limit;
|
|
setrlimit (RLIMIT_DATA, &r);
|
|
#ifdef RLIMIT_RSS
|
|
// Resident set size.
|
|
getrlimit (RLIMIT_RSS, &r);
|
|
r.rlim_cur = limit;
|
|
setrlimit (RLIMIT_RSS, &r);
|
|
#endif
|
|
#ifdef RLIMIT_AS // e.g. NetBSD doesn't have it.
|
|
// Virtual memory.
|
|
getrlimit (RLIMIT_AS, &r);
|
|
r.rlim_cur = limit;
|
|
setrlimit (RLIMIT_AS, &r);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
bool
|
|
Program::Execute(const Path &path, const char **args, const char **envp,
|
|
const Path **redirects, unsigned memoryLimit,
|
|
std::string *ErrMsg) {
|
|
// If this OS has posix_spawn and there is no memory limit being implied, use
|
|
// posix_spawn. It is more efficient than fork/exec.
|
|
#ifdef HAVE_POSIX_SPAWN
|
|
if (memoryLimit == 0) {
|
|
posix_spawn_file_actions_t FileActionsStore;
|
|
posix_spawn_file_actions_t *FileActions = 0;
|
|
|
|
if (redirects) {
|
|
FileActions = &FileActionsStore;
|
|
posix_spawn_file_actions_init(FileActions);
|
|
|
|
// Redirect stdin/stdout.
|
|
if (RedirectIO_PS(redirects[0], 0, ErrMsg, FileActions) ||
|
|
RedirectIO_PS(redirects[1], 1, ErrMsg, FileActions))
|
|
return false;
|
|
if (redirects[1] == 0 || redirects[2] == 0 ||
|
|
*redirects[1] != *redirects[2]) {
|
|
// Just redirect stderr
|
|
if (RedirectIO_PS(redirects[2], 2, ErrMsg, FileActions)) return false;
|
|
} else {
|
|
// If stdout and stderr should go to the same place, redirect stderr
|
|
// to the FD already open for stdout.
|
|
if (int Err = posix_spawn_file_actions_adddup2(FileActions, 1, 2))
|
|
return !MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout", Err);
|
|
}
|
|
}
|
|
|
|
if (!envp)
|
|
#if !defined(__APPLE__)
|
|
envp = const_cast<const char **>(environ);
|
|
#else
|
|
// environ is missing in dylibs.
|
|
envp = const_cast<const char **>(*_NSGetEnviron());
|
|
#endif
|
|
|
|
// Explicitly initialized to prevent what appears to be a valgrind false
|
|
// positive.
|
|
pid_t PID = 0;
|
|
int Err = posix_spawn(&PID, path.c_str(), FileActions, /*attrp*/0,
|
|
const_cast<char **>(args), const_cast<char **>(envp));
|
|
|
|
if (FileActions)
|
|
posix_spawn_file_actions_destroy(FileActions);
|
|
|
|
if (Err)
|
|
return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
|
|
|
|
Data_ = reinterpret_cast<void*>(PID);
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
// Create a child process.
|
|
int child = fork();
|
|
switch (child) {
|
|
// An error occurred: Return to the caller.
|
|
case -1:
|
|
MakeErrMsg(ErrMsg, "Couldn't fork");
|
|
return false;
|
|
|
|
// Child process: Execute the program.
|
|
case 0: {
|
|
// Redirect file descriptors...
|
|
if (redirects) {
|
|
// Redirect stdin
|
|
if (RedirectIO(redirects[0], 0, ErrMsg)) { return false; }
|
|
// Redirect stdout
|
|
if (RedirectIO(redirects[1], 1, ErrMsg)) { return false; }
|
|
if (redirects[1] && redirects[2] &&
|
|
*(redirects[1]) == *(redirects[2])) {
|
|
// If stdout and stderr should go to the same place, redirect stderr
|
|
// to the FD already open for stdout.
|
|
if (-1 == dup2(1,2)) {
|
|
MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
|
|
return false;
|
|
}
|
|
} else {
|
|
// Just redirect stderr
|
|
if (RedirectIO(redirects[2], 2, ErrMsg)) { return false; }
|
|
}
|
|
}
|
|
|
|
// Set memory limits
|
|
if (memoryLimit!=0) {
|
|
SetMemoryLimits(memoryLimit);
|
|
}
|
|
|
|
// Execute!
|
|
if (envp != 0)
|
|
execve(path.c_str(),
|
|
const_cast<char **>(args),
|
|
const_cast<char **>(envp));
|
|
else
|
|
execv(path.c_str(),
|
|
const_cast<char **>(args));
|
|
// If the execve() failed, we should exit. Follow Unix protocol and
|
|
// return 127 if the executable was not found, and 126 otherwise.
|
|
// Use _exit rather than exit so that atexit functions and static
|
|
// object destructors cloned from the parent process aren't
|
|
// redundantly run, and so that any data buffered in stdio buffers
|
|
// cloned from the parent aren't redundantly written out.
|
|
_exit(errno == ENOENT ? 127 : 126);
|
|
}
|
|
|
|
// Parent process: Break out of the switch to do our processing.
|
|
default:
|
|
break;
|
|
}
|
|
|
|
Data_ = reinterpret_cast<void*>(child);
|
|
|
|
return true;
|
|
}
|
|
|
|
int
|
|
Program::Wait(const sys::Path &path,
|
|
unsigned secondsToWait,
|
|
std::string* ErrMsg)
|
|
{
|
|
#ifdef HAVE_SYS_WAIT_H
|
|
struct sigaction Act, Old;
|
|
|
|
if (Data_ == 0) {
|
|
MakeErrMsg(ErrMsg, "Process not started!");
|
|
return -1;
|
|
}
|
|
|
|
// Install a timeout handler. The handler itself does nothing, but the simple
|
|
// fact of having a handler at all causes the wait below to return with EINTR,
|
|
// unlike if we used SIG_IGN.
|
|
if (secondsToWait) {
|
|
memset(&Act, 0, sizeof(Act));
|
|
Act.sa_handler = TimeOutHandler;
|
|
sigemptyset(&Act.sa_mask);
|
|
sigaction(SIGALRM, &Act, &Old);
|
|
alarm(secondsToWait);
|
|
}
|
|
|
|
// Parent process: Wait for the child process to terminate.
|
|
int status;
|
|
uint64_t pid = reinterpret_cast<uint64_t>(Data_);
|
|
pid_t child = static_cast<pid_t>(pid);
|
|
while (waitpid(pid, &status, 0) != child)
|
|
if (secondsToWait && errno == EINTR) {
|
|
// Kill the child.
|
|
kill(child, SIGKILL);
|
|
|
|
// Turn off the alarm and restore the signal handler
|
|
alarm(0);
|
|
sigaction(SIGALRM, &Old, 0);
|
|
|
|
// Wait for child to die
|
|
if (wait(&status) != child)
|
|
MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
|
|
else
|
|
MakeErrMsg(ErrMsg, "Child timed out", 0);
|
|
|
|
return -1; // Timeout detected
|
|
} else if (errno != EINTR) {
|
|
MakeErrMsg(ErrMsg, "Error waiting for child process");
|
|
return -1;
|
|
}
|
|
|
|
// We exited normally without timeout, so turn off the timer.
|
|
if (secondsToWait) {
|
|
alarm(0);
|
|
sigaction(SIGALRM, &Old, 0);
|
|
}
|
|
|
|
// Return the proper exit status. Detect error conditions
|
|
// so we can return -1 for them and set ErrMsg informatively.
|
|
int result = 0;
|
|
if (WIFEXITED(status)) {
|
|
result = WEXITSTATUS(status);
|
|
#ifdef HAVE_POSIX_SPAWN
|
|
// The posix_spawn child process returns 127 on any kind of error.
|
|
// Following the POSIX convention for command-line tools (which posix_spawn
|
|
// itself apparently does not), check to see if the failure was due to some
|
|
// reason other than the file not existing, and return 126 in this case.
|
|
bool Exists;
|
|
if (result == 127 && !llvm::sys::fs::exists(path.str(), Exists) && Exists)
|
|
result = 126;
|
|
#endif
|
|
if (result == 127) {
|
|
if (ErrMsg)
|
|
*ErrMsg = llvm::sys::StrError(ENOENT);
|
|
return -1;
|
|
}
|
|
if (result == 126) {
|
|
if (ErrMsg)
|
|
*ErrMsg = "Program could not be executed";
|
|
return -1;
|
|
}
|
|
} else if (WIFSIGNALED(status)) {
|
|
if (ErrMsg) {
|
|
*ErrMsg = strsignal(WTERMSIG(status));
|
|
#ifdef WCOREDUMP
|
|
if (WCOREDUMP(status))
|
|
*ErrMsg += " (core dumped)";
|
|
#endif
|
|
}
|
|
return -1;
|
|
}
|
|
return result;
|
|
#else
|
|
if (ErrMsg)
|
|
*ErrMsg = "Program::Wait is not implemented on this platform yet!";
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
bool
|
|
Program::Kill(std::string* ErrMsg) {
|
|
if (Data_ == 0) {
|
|
MakeErrMsg(ErrMsg, "Process not started!");
|
|
return true;
|
|
}
|
|
|
|
uint64_t pid64 = reinterpret_cast<uint64_t>(Data_);
|
|
pid_t pid = static_cast<pid_t>(pid64);
|
|
|
|
if (kill(pid, SIGKILL) != 0) {
|
|
MakeErrMsg(ErrMsg, "The process couldn't be killed!");
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool Program::ChangeStdinToBinary(){
|
|
// Do nothing, as Unix doesn't differentiate between text and binary.
|
|
return false;
|
|
}
|
|
|
|
bool Program::ChangeStdoutToBinary(){
|
|
// Do nothing, as Unix doesn't differentiate between text and binary.
|
|
return false;
|
|
}
|
|
|
|
bool Program::ChangeStderrToBinary(){
|
|
// Do nothing, as Unix doesn't differentiate between text and binary.
|
|
return false;
|
|
}
|
|
|
|
}
|