//=== is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//
-#include <llvm/Config/config.h>
-#include <llvm/Config/alloca.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>
+#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(const 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;
}
+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;
+ 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, ':');
Paths.push_back(tmpPath);
}
+
void
Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
#ifdef LTDL_SHLIBPATH_VAR
if (env_var != 0) {
getPathList(env_var,Paths);
}
-#ifdef LLVMGCCDIR
- {
- Path tmpPath(std::string(LLVMGCCDIR) + "bytecode-libs/");
- if (tmpPath.readable())
- Paths.push_back(tmpPath);
- }
-#endif
#ifdef LLVM_LIBDIR
{
Path tmpPath;
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");
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(std::set<Path>& result) const {
if (!isDirectory())
Path save(*this);
path = a_path;
size_t last = a_path.size() -1;
- if (a_path.size() == 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");
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