//=== is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//
-#include <llvm/Config/config.h>
+#include "llvm/Config/alloca.h"
#include "Unix.h"
+#if HAVE_SYS_STAT_H
#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
#include <fcntl.h>
-#include <fstream>
+#endif
+#if HAVE_UTIME_H
#include <utime.h>
-#include <dirent.h>
+#endif
+#if HAVE_TIME_H
+#include <time.h>
+#endif
+#if HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# if HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# if HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# if HAVE_NDIR_H
+# include <ndir.h>
+# endif
+#endif
+
namespace llvm {
using namespace sys;
-Path::Path(std::string unverified_path)
- : path(unverified_path)
-{
+Path::Path(const std::string& unverified_path) : path(unverified_path) {
if (unverified_path.empty())
return;
if (this->isValid())
ThrowErrno(unverified_path + ": path is not valid");
}
+bool
+Path::isValid() const {
+ if (path.empty())
+ return false;
+ else if (path.length() >= MAXPATHLEN)
+ return false;
+#if defined(HAVE_REALPATH)
+ char pathname[MAXPATHLEN];
+ if (0 == realpath(path.c_str(), pathname))
+ if (errno != EACCES && errno != EIO && errno != ENOENT && errno != ENOTDIR)
+ return false;
+#endif
+ return true;
+}
+
Path
Path::GetRootDirectory() {
Path result;
return result;
}
-static inline bool IsLibrary(Path& path, const std::string& basename) {
- if (path.appendFile(std::string("lib") + basename)) {
- if (path.appendSuffix(Path::GetDLLSuffix()) && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("a") && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("o") && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("bc") && path.readable())
- return true;
- } else if (path.elideFile() && path.appendFile(basename)) {
- if (path.appendSuffix(Path::GetDLLSuffix()) && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("a") && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("o") && path.readable())
- return true;
- else if (path.elideSuffix() && path.appendSuffix("bc") && path.readable())
- return true;
- }
- path.clear();
- return false;
-}
-
-Path
-Path::GetLibraryPath(const std::string& basename,
- const std::vector<std::string>& LibPaths) {
+Path
+Path::GetTemporaryDirectory() {
+#if defined(HAVE_MKDTEMP)
+ // The best way is with mkdtemp but that's not available on many systems,
+ // Linux and FreeBSD have it. Others probably won't.
+ char pathname[MAXPATHLEN];
+ strcpy(pathname,"/tmp/llvm_XXXXXX");
+ if (0 == mkdtemp(pathname))
+ ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
Path result;
-
- // Try the paths provided
- for (std::vector<std::string>::const_iterator I = LibPaths.begin(),
- E = LibPaths.end(); I != E; ++I ) {
- if (result.setDirectory(*I) && IsLibrary(result,basename))
- return result;
- }
-
- // Try the LLVM lib directory in the LLVM install area
- if (result.setDirectory(LLVM_LIBDIR) && IsLibrary(result,basename))
- return result;
-
- // Try /usr/lib
- if (result.setDirectory("/usr/lib/") && IsLibrary(result,basename))
- return result;
-
- // Try /lib
- if (result.setDirectory("/lib/") && IsLibrary(result,basename))
- return result;
-
- // Can't find it, give up and return invalid path.
- result.clear();
+ result.setDirectory(pathname);
+ assert(result.isValid() && "mkdtemp didn't create a valid pathname!");
return result;
-}
+#elif defined(HAVE_MKSTEMP)
+ // If no mkdtemp is available, mkstemp can be used to create a temporary file
+ // which is then removed and created as a directory. We prefer this over
+ // mktemp because of mktemp's inherent security and threading risks. We still
+ // have a slight race condition from the time the temporary file is created to
+ // the time it is re-created as a directoy.
+ char pathname[MAXPATHLEN];
+ strcpy(pathname, "/tmp/llvm_XXXXXX");
+ int fd = 0;
+ if (-1 == (fd = mkstemp(pathname)))
+ ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+ ::close(fd);
+ ::unlink(pathname); // start race condition, ignore errors
+ if (-1 == ::mkdir(pathname, S_IRWXU)) // end race condition
+ ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+ Path result;
+ result.setDirectory(pathname);
+ assert(result.isValid() && "mkstemp didn't create a valid pathname!");
+ return result;
+#elif defined(HAVE_MKTEMP)
+ // If a system doesn't have mkdtemp(3) or mkstemp(3) but it does have
+ // mktemp(3) then we'll assume that system (e.g. AIX) has a reasonable
+ // implementation of mktemp(3) and doesn't follow BSD 4.3's lead of replacing
+ // the XXXXXX with the pid of the process and a letter. That leads to only
+ // twenty six temporary files that can be generated.
+ char pathname[MAXPATHLEN];
+ strcpy(pathname, "/tmp/llvm_XXXXXX");
+ char *TmpName = ::mktemp(pathname);
+ if (TmpName == 0)
+ throw std::string(TmpName) + ": Can't create unique directory name";
+ if (-1 == ::mkdir(TmpName, S_IRWXU))
+ ThrowErrno(std::string(TmpName) + ": Can't create temporary directory");
+ Path result;
+ result.setDirectory(TmpName);
+ assert(result.isValid() && "mktemp didn't create a valid pathname!");
+ return result;
+#else
+ // This is the worst case implementation. tempnam(3) leaks memory unless its
+ // on an SVID2 (or later) system. On BSD 4.3 it leaks. tmpnam(3) has thread
+ // issues. The mktemp(3) function doesn't have enough variability in the
+ // temporary name generated. So, we provide our own implementation that
+ // increments an integer from a random number seeded by the current time. This
+ // should be sufficiently unique that we don't have many collisions between
+ // processes. Generally LLVM processes don't run very long and don't use very
+ // many temporary files so this shouldn't be a big issue for LLVM.
+ static time_t num = ::time(0);
+ char pathname[MAXPATHLEN];
+ do {
+ num++;
+ sprintf(pathname, "/tmp/llvm_%010u", unsigned(num));
+ } while ( 0 == access(pathname, F_OK ) );
+ if (-1 == ::mkdir(pathname, S_IRWXU))
+ ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+ Path result;
+ result.setDirectory(pathname);
+ assert(result.isValid() && "mkstemp didn't create a valid pathname!");
+ return result;
+#endif
+}
+
+static void getPathList(const char*path, std::vector<sys::Path>& Paths) {
+ const char* at = path;
+ const char* delim = strchr(at, ':');
+ Path tmpPath;
+ while( delim != 0 ) {
+ std::string tmp(at, size_t(delim-at));
+ if (tmpPath.setDirectory(tmp))
+ if (tmpPath.readable())
+ Paths.push_back(tmpPath);
+ at = delim + 1;
+ delim = strchr(at, ':');
+ }
+ if (*at != 0)
+ if (tmpPath.setDirectory(std::string(at)))
+ if (tmpPath.readable())
+ Paths.push_back(tmpPath);
-Path
-Path::GetSystemLibraryPath1() {
- return Path("/lib/");
}
-Path
-Path::GetSystemLibraryPath2() {
- return Path("/usr/lib/");
+void
+Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
+#ifdef LTDL_SHLIBPATH_VAR
+ char* env_var = getenv(LTDL_SHLIBPATH_VAR);
+ if (env_var != 0) {
+ getPathList(env_var,Paths);
+ }
+#endif
+ // FIXME: Should this look at LD_LIBRARY_PATH too?
+ Paths.push_back(sys::Path("/usr/local/lib/"));
+ Paths.push_back(sys::Path("/usr/X11R6/lib/"));
+ Paths.push_back(sys::Path("/usr/lib/"));
+ Paths.push_back(sys::Path("/lib/"));
+}
+
+void
+Path::GetBytecodeLibraryPaths(std::vector<sys::Path>& Paths) {
+ char * env_var = getenv("LLVM_LIB_SEARCH_PATH");
+ if (env_var != 0) {
+ getPathList(env_var,Paths);
+ }
+#ifdef LLVM_LIBDIR
+ {
+ Path tmpPath;
+ if (tmpPath.setDirectory(LLVM_LIBDIR))
+ if (tmpPath.readable())
+ Paths.push_back(tmpPath);
+ }
+#endif
+ GetSystemLibraryPaths(Paths);
}
Path
return Path("/etc/llvm/");
}
-Path
-Path::GetLLVMConfigDir() {
- Path result;
- if (result.setDirectory(LLVM_ETCDIR))
- return result;
- return GetLLVMDefaultConfigDir();
-}
-
Path
Path::GetUserHomeDirectory() {
const char* home = getenv("HOME");
bool Path::hasMagicNumber(const std::string &Magic) const {
size_t len = Magic.size();
- char buf[ 1 + len];
- std::ifstream f(path.c_str());
- f.read(buf, len);
+ assert(len < 1024 && "Request for magic string too long");
+ char* buf = (char*) alloca(1 + len);
+ int fd = ::open(path.c_str(),O_RDONLY);
+ if (fd < 0)
+ return false;
+ size_t read_len = ::read(fd, buf, len);
+ close(fd);
+ if (len != read_len)
+ return false;
buf[len] = '\0';
- f.close();
return Magic == buf;
}
bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile())
return false;
- char buf[1 + len];
- std::ifstream f(path.c_str());
- f.read(buf,len);
- buf[len] = '\0';
- Magic = buf;
+ assert(len < 1024 && "Request for magic string too long");
+ char* buf = (char*) alloca(1 + len);
+ int fd = ::open(path.c_str(),O_RDONLY);
+ if (fd < 0)
+ return false;
+ ssize_t bytes_read = ::read(fd, buf, len);
+ ::close(fd);
+ if (ssize_t(len) != bytes_read) {
+ Magic.clear();
+ return false;
+ }
+ Magic.assign(buf,len);
return true;
}
Path::isBytecodeFile() const {
char buffer[ 4];
buffer[0] = 0;
- std::ifstream f(path.c_str());
- f.read(buffer, 4);
- if (f.bad())
- ThrowErrno("can't read file signature");
+ int fd = ::open(path.c_str(),O_RDONLY);
+ if (fd < 0)
+ return false;
+ ssize_t bytes_read = ::read(fd, buffer, 4);
+ ::close(fd);
+ if (4 != bytes_read)
+ return false;
return (buffer[0] == 'l' && buffer[1] == 'l' && buffer[2] == 'v' &&
(buffer[3] == 'c' || buffer[3] == 'm'));
}
-bool
-Path::isArchive() const {
- if (readable()) {
- return hasMagicNumber("!<arch>\012");
- }
- return false;
-}
-
bool
Path::exists() const {
return 0 == access(path.c_str(), F_OK );
return path.substr(pos+1);
}
-bool
-Path::getStatusInfo(StatusInfo& info) {
- if (!isFile() || !readable())
- return false;
+void
+Path::getStatusInfo(StatusInfo& info) const {
struct stat buf;
if (0 != stat(path.c_str(), &buf)) {
ThrowErrno(std::string("Can't get status: ")+path);
info.isDir = S_ISDIR(buf.st_mode);
if (info.isDir && path[path.length()-1] != '/')
path += '/';
+}
+
+static bool AddPermissionBits(const std::string& Filename, int bits) {
+ // Get the umask value from the operating system. We want to use it
+ // when changing the file's permissions. Since calling umask() sets
+ // the umask and returns its old value, we must call it a second
+ // time to reset it to the user's preference.
+ int mask = umask(0777); // The arg. to umask is arbitrary.
+ umask(mask); // Restore the umask.
+
+ // Get the file's current mode.
+ struct stat st;
+ if ((stat(Filename.c_str(), &st)) == -1)
+ return false;
+
+ // Change the file to have whichever permissions bits from 'bits'
+ // that the umask would not disable.
+ if ((chmod(Filename.c_str(), (st.st_mode | (bits & ~mask)))) == -1)
+ return false;
+
return true;
}
+void Path::makeReadable() {
+ if (!AddPermissionBits(path,0444))
+ ThrowErrno(path + ": can't make file readable");
+}
+
+void Path::makeWriteable() {
+ if (!AddPermissionBits(path,0222))
+ ThrowErrno(path + ": can't make file writable");
+}
+
+void Path::makeExecutable() {
+ if (!AddPermissionBits(path,0111))
+ ThrowErrno(path + ": can't make file executable");
+}
+
bool
-Path::getDirectoryContents(Vector& result) const {
+Path::getDirectoryContents(std::set<Path>& result) const {
if (!isDirectory())
return false;
DIR* direntries = ::opendir(path.c_str());
ThrowErrno(aPath.path + ": can't get status");
if (S_ISDIR(buf.st_mode))
aPath.path += "/";
- result.push_back(aPath);
+ result.insert(aPath);
}
de = ::readdir(direntries);
}
Path save(*this);
path = a_path;
size_t last = a_path.size() -1;
- if (last != 0 && a_path[last] != '/')
+ if (a_path[last] != '/')
path += '/';
if (!isValid()) {
path = save.path;
}
bool
-Path::createTemporaryFile() {
+Path::createTemporaryFile(bool reuse_current) {
// Make sure we're dealing with a file
- if (!isFile()) return false;
+ if (!isFile())
+ return false;
- // Append the filename filler
- char pathname[MAXPATHLEN];
- path.copy(pathname,MAXPATHLEN);
- pathname[path.length()] = 0;
- strcat(pathname,"XXXXXX");
- int fd = ::mkstemp(pathname);
- if (fd < 0) {
- ThrowErrno(path + ": Can't create temporary file");
+ // Make this into a unique file name
+ makeUnique( reuse_current );
+
+ // create the file
+ int outFile = ::open(path.c_str(), O_WRONLY|O_CREAT|O_TRUNC, 0666);
+ if (outFile != -1) {
+ ::close(outFile);
+ return true;
}
- path = pathname;
- ::close(fd);
- return true;
+ return false;
}
bool
-Path::destroyDirectory(bool remove_contents) {
+Path::destroyDirectory(bool remove_contents) const {
// Make sure we're dealing with a directory
if (!isDirectory()) return false;
}
bool
-Path::destroyFile() {
+Path::destroyFile() const {
if (!isFile()) return false;
if (0 != unlink(path.c_str()))
ThrowErrno(path + ": Can't destroy file");
Path::renameFile(const Path& newName) {
if (!isFile()) return false;
if (0 != rename(path.c_str(), newName.c_str()))
- ThrowErrno(std::string("can't rename ") + path + " as " + newName.get());
+ ThrowErrno(std::string("can't rename ") + path + " as " +
+ newName.toString());
return true;
}
return true;
}
+void
+sys::CopyFile(const sys::Path &Dest, const sys::Path &Src) {
+ int inFile = -1;
+ int outFile = -1;
+ try {
+ inFile = ::open(Src.c_str(), O_RDONLY);
+ if (inFile == -1)
+ ThrowErrno("Cannnot open source file to copy: " + Src.toString());
+
+ outFile = ::open(Dest.c_str(), O_WRONLY|O_CREAT, 0666);
+ if (outFile == -1)
+ ThrowErrno("Cannnot create destination file for copy: " +Dest.toString());
+
+ char Buffer[16*1024];
+ while (ssize_t Amt = ::read(inFile, Buffer, 16*1024)) {
+ if (Amt == -1) {
+ if (errno != EINTR && errno != EAGAIN)
+ ThrowErrno("Can't read source file: " + Src.toString());
+ } else {
+ char *BufPtr = Buffer;
+ while (Amt) {
+ ssize_t AmtWritten = ::write(outFile, BufPtr, Amt);
+ if (AmtWritten == -1) {
+ if (errno != EINTR && errno != EAGAIN)
+ ThrowErrno("Can't write destination file: " + Dest.toString());
+ } else {
+ Amt -= AmtWritten;
+ BufPtr += AmtWritten;
+ }
+ }
+ }
+ }
+ ::close(inFile);
+ ::close(outFile);
+ } catch (...) {
+ if (inFile != -1)
+ ::close(inFile);
+ if (outFile != -1)
+ ::close(outFile);
+ throw;
+ }
+}
+
+void
+Path::makeUnique(bool reuse_current) {
+ if (reuse_current && !exists())
+ return; // File doesn't exist already, just use it!
+
+ // Append an XXXXXX pattern to the end of the file for use with mkstemp,
+ // mktemp or our own implementation.
+ char *FNBuffer = (char*) alloca(path.size()+8);
+ path.copy(FNBuffer,path.size());
+ strcpy(FNBuffer+path.size(), "-XXXXXX");
+
+#if defined(HAVE_MKSTEMP)
+ int TempFD;
+ if ((TempFD = mkstemp(FNBuffer)) == -1) {
+ ThrowErrno("Cannot make unique filename for '" + path + "'");
+ }
+
+ // We don't need to hold the temp file descriptor... we will trust that no one
+ // will overwrite/delete the file before we can open it again.
+ close(TempFD);
+
+ // Save the name
+ path = FNBuffer;
+#elif defined(HAVE_MKTEMP)
+ // If we don't have mkstemp, use the old and obsolete mktemp function.
+ if (mktemp(FNBuffer) == 0) {
+ ThrowErrno("Cannot make unique filename for '" + path + "'");
+ }
+
+ // Save the name
+ path = FNBuffer;
+#else
+ // Okay, looks like we have to do it all by our lonesome.
+ static unsigned FCounter = 0;
+ unsigned offset = path.size() + 1;
+ while ( FCounter < 999999 && exists()) {
+ sprintf(FNBuffer+offset,"%06u",++FCounter);
+ path = FNBuffer;
+ }
+ if (FCounter > 999999)
+ throw std::string("Cannot make unique filename for '" + path + "'");
+#endif
+
+}
}
// vim: sw=2
projects / oota-llvm.git / blobdiff