#include "Unix.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include <llvm/Config/config.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
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_POSIX_SPAWN
#ifdef __sun__
#define _RESTRICT_KYWD
#endif
#include <spawn.h>
#if defined(__APPLE__)
#include <TargetConditionals.h>
#endif
#if !defined(__APPLE__) || defined(TARGET_OS_IPHONE)
extern char **environ;
#else
#include <crt_externs.h> // _NSGetEnviron
#endif
#endif
namespace llvm {
using namespace sys;
ProcessInfo::ProcessInfo() : Pid(0), ReturnCode(0) {}
ErrorOr<std::string> sys::findProgramByName(StringRef Name,
ArrayRef<StringRef> Paths) {
assert(!Name.empty() && "Must have a name!");
if (Name.find('/') != StringRef::npos)
return std::string(Name);
SmallVector<StringRef, 16> EnvironmentPaths;
if (Paths.empty())
if (const char *PathEnv = std::getenv("PATH")) {
SplitString(PathEnv, EnvironmentPaths, ":");
Paths = EnvironmentPaths;
}
for (auto Path : Paths) {
if (Path.empty())
continue;
SmallString<128> FilePath(Path);
sys::path::append(FilePath, Name);
if (sys::fs::can_execute(FilePath.c_str()))
return std::string(FilePath.str()); }
return std::errc::no_such_file_or_directory;
}
static bool RedirectIO(const StringRef *Path, int FD, std::string* ErrMsg) {
if (!Path) return false;
std::string File;
if (Path->empty())
File = "/dev/null";
else
File = *Path;
int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
if (InFD == -1) {
MakeErrMsg(ErrMsg, "Cannot open file '" + File + "' for "
+ (FD == 0 ? "input" : "output"));
return true;
}
if (dup2(InFD, FD) == -1) {
MakeErrMsg(ErrMsg, "Cannot dup2");
close(InFD);
return true;
}
close(InFD); return false;
}
#ifdef HAVE_POSIX_SPAWN
static bool RedirectIO_PS(const std::string *Path, int FD, std::string *ErrMsg,
posix_spawn_file_actions_t *FileActions) {
if (!Path) return false;
const char *File;
if (Path->empty())
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;
getrlimit (RLIMIT_DATA, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_DATA, &r);
#ifdef RLIMIT_RSS
getrlimit (RLIMIT_RSS, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_RSS, &r);
#endif
#ifdef RLIMIT_AS // e.g. NetBSD doesn't have it.
#if !LLVM_MEMORY_SANITIZER_BUILD && !LLVM_ADDRESS_SANITIZER_BUILD
getrlimit (RLIMIT_AS, &r);
r.rlim_cur = limit;
setrlimit (RLIMIT_AS, &r);
#endif
#endif
#endif
}
}
static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
const char **envp, const StringRef **redirects,
unsigned memoryLimit, std::string *ErrMsg) {
if (!llvm::sys::fs::exists(Program)) {
if (ErrMsg)
*ErrMsg = std::string("Executable \"") + Program.str() +
std::string("\" doesn't exist!");
return false;
}
#ifdef HAVE_POSIX_SPAWN
if (memoryLimit == 0) {
posix_spawn_file_actions_t FileActionsStore;
posix_spawn_file_actions_t *FileActions = nullptr;
std::string RedirectsStorage[3];
if (redirects) {
std::string *RedirectsStr[3] = {nullptr, nullptr, nullptr};
for (int I = 0; I < 3; ++I) {
if (redirects[I]) {
RedirectsStorage[I] = *redirects[I];
RedirectsStr[I] = &RedirectsStorage[I];
}
}
FileActions = &FileActionsStore;
posix_spawn_file_actions_init(FileActions);
if (RedirectIO_PS(RedirectsStr[0], 0, ErrMsg, FileActions) ||
RedirectIO_PS(RedirectsStr[1], 1, ErrMsg, FileActions))
return false;
if (redirects[1] == nullptr || redirects[2] == nullptr ||
*redirects[1] != *redirects[2]) {
if (RedirectIO_PS(RedirectsStr[2], 2, ErrMsg, FileActions))
return false;
} else {
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__) || defined(TARGET_OS_IPHONE)
envp = const_cast<const char **>(environ);
#else
envp = const_cast<const char **>(*_NSGetEnviron());
#endif
pid_t PID = 0;
int Err = posix_spawn(&PID, Program.str().c_str(), FileActions,
nullptr, 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);
PI.Pid = PID;
return true;
}
#endif
int child = fork();
switch (child) {
case -1:
MakeErrMsg(ErrMsg, "Couldn't fork");
return false;
case 0: {
if (redirects) {
if (RedirectIO(redirects[0], 0, ErrMsg)) { return false; }
if (RedirectIO(redirects[1], 1, ErrMsg)) { return false; }
if (redirects[1] && redirects[2] &&
*(redirects[1]) == *(redirects[2])) {
if (-1 == dup2(1,2)) {
MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
return false;
}
} else {
if (RedirectIO(redirects[2], 2, ErrMsg)) { return false; }
}
}
if (memoryLimit!=0) {
SetMemoryLimits(memoryLimit);
}
std::string PathStr = Program;
if (envp != nullptr)
execve(PathStr.c_str(),
const_cast<char **>(args),
const_cast<char **>(envp));
else
execv(PathStr.c_str(),
const_cast<char **>(args));
_exit(errno == ENOENT ? 127 : 126);
}
default:
break;
}
PI.Pid = child;
return true;
}
namespace llvm {
ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
bool WaitUntilTerminates, std::string *ErrMsg) {
#ifdef HAVE_SYS_WAIT_H
struct sigaction Act, Old;
assert(PI.Pid && "invalid pid to wait on, process not started?");
int WaitPidOptions = 0;
pid_t ChildPid = PI.Pid;
if (WaitUntilTerminates) {
SecondsToWait = 0;
} else if (SecondsToWait) {
memset(&Act, 0, sizeof(Act));
Act.sa_handler = TimeOutHandler;
sigemptyset(&Act.sa_mask);
sigaction(SIGALRM, &Act, &Old);
alarm(SecondsToWait);
} else if (SecondsToWait == 0)
WaitPidOptions = WNOHANG;
int status;
ProcessInfo WaitResult;
do {
WaitResult.Pid = waitpid(ChildPid, &status, WaitPidOptions);
} while (WaitUntilTerminates && WaitResult.Pid == -1 && errno == EINTR);
if (WaitResult.Pid != PI.Pid) {
if (WaitResult.Pid == 0) {
return WaitResult;
} else {
if (SecondsToWait && errno == EINTR) {
kill(PI.Pid, SIGKILL);
alarm(0);
sigaction(SIGALRM, &Old, nullptr);
if (wait(&status) != ChildPid)
MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
else
MakeErrMsg(ErrMsg, "Child timed out", 0);
WaitResult.ReturnCode = -2; return WaitResult;
} else if (errno != EINTR) {
MakeErrMsg(ErrMsg, "Error waiting for child process");
WaitResult.ReturnCode = -1;
return WaitResult;
}
}
}
if (SecondsToWait && !WaitUntilTerminates) {
alarm(0);
sigaction(SIGALRM, &Old, nullptr);
}
int result = 0;
if (WIFEXITED(status)) {
result = WEXITSTATUS(status);
WaitResult.ReturnCode = result;
if (result == 127) {
if (ErrMsg)
*ErrMsg = llvm::sys::StrError(ENOENT);
WaitResult.ReturnCode = -1;
return WaitResult;
}
if (result == 126) {
if (ErrMsg)
*ErrMsg = "Program could not be executed";
WaitResult.ReturnCode = -1;
return WaitResult;
}
} else if (WIFSIGNALED(status)) {
if (ErrMsg) {
*ErrMsg = strsignal(WTERMSIG(status));
#ifdef WCOREDUMP
if (WCOREDUMP(status))
*ErrMsg += " (core dumped)";
#endif
}
WaitResult.ReturnCode = -2;
}
#else
if (ErrMsg)
*ErrMsg = "Program::Wait is not implemented on this platform yet!";
ProcessInfo WaitResult;
WaitResult.ReturnCode = -2;
#endif
return WaitResult;
}
std::error_code sys::ChangeStdinToBinary(){
return std::error_code();
}
std::error_code sys::ChangeStdoutToBinary(){
return std::error_code();
}
std::error_code
llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
WindowsEncodingMethod Encoding ) {
std::error_code EC;
llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::F_Text);
if (EC)
return EC;
OS << Contents;
if (OS.has_error())
return std::make_error_code(std::errc::io_error);
return EC;
}
bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
static long ArgMax = sysconf(_SC_ARG_MAX);
if (ArgMax == -1)
return true;
long HalfArgMax = ArgMax / 2;
size_t ArgLength = 0;
for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
I != E; ++I) {
ArgLength += strlen(*I) + 1;
if (ArgLength > size_t(HalfArgMax)) {
return false;
}
}
return true;
}
}