LCOV - code coverage report
Current view: top level - lib/Support/Unix - Path.inc (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 289 395 73.2 %
Date: 2018-10-20 13:21:21 Functions: 44 55 80.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file implements the Unix specific implementation of the Path API.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : //===----------------------------------------------------------------------===//
      15             : //=== WARNING: Implementation here must contain only generic UNIX code that
      16             : //===          is guaranteed to work on *all* UNIX variants.
      17             : //===----------------------------------------------------------------------===//
      18             : 
      19             : #include "Unix.h"
      20             : #include <limits.h>
      21             : #include <stdio.h>
      22             : #if HAVE_SYS_STAT_H
      23             : #include <sys/stat.h>
      24             : #endif
      25             : #if HAVE_FCNTL_H
      26             : #include <fcntl.h>
      27             : #endif
      28             : #ifdef HAVE_UNISTD_H
      29             : #include <unistd.h>
      30             : #endif
      31             : #ifdef HAVE_SYS_MMAN_H
      32             : #include <sys/mman.h>
      33             : #endif
      34             : 
      35             : #include <dirent.h>
      36             : #include <pwd.h>
      37             : 
      38             : #ifdef __APPLE__
      39             : #include <mach-o/dyld.h>
      40             : #include <sys/attr.h>
      41             : #endif
      42             : 
      43             : // Both stdio.h and cstdio are included via different paths and
      44             : // stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
      45             : // either.
      46             : #undef ferror
      47             : #undef feof
      48             : 
      49             : // For GNU Hurd
      50             : #if defined(__GNU__) && !defined(PATH_MAX)
      51             : # define PATH_MAX 4096
      52             : # define MAXPATHLEN 4096
      53             : #endif
      54             : 
      55             : #include <sys/types.h>
      56             : #if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) &&   \
      57             :     !defined(__linux__)
      58             : #include <sys/statvfs.h>
      59             : #define STATVFS statvfs
      60             : #define FSTATVFS fstatvfs
      61             : #define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
      62             : #else
      63             : #if defined(__OpenBSD__) || defined(__FreeBSD__)
      64             : #include <sys/mount.h>
      65             : #include <sys/param.h>
      66             : #elif defined(__linux__)
      67             : #if defined(HAVE_LINUX_MAGIC_H)
      68             : #include <linux/magic.h>
      69             : #else
      70             : #if defined(HAVE_LINUX_NFS_FS_H)
      71             : #include <linux/nfs_fs.h>
      72             : #endif
      73             : #if defined(HAVE_LINUX_SMB_H)
      74             : #include <linux/smb.h>
      75             : #endif
      76             : #endif
      77             : #include <sys/vfs.h>
      78             : #else
      79             : #include <sys/mount.h>
      80             : #endif
      81             : #define STATVFS statfs
      82             : #define FSTATVFS fstatfs
      83             : #define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
      84             : #endif
      85             : 
      86             : #if defined(__NetBSD__)
      87             : #define STATVFS_F_FLAG(vfs) (vfs).f_flag
      88             : #else
      89             : #define STATVFS_F_FLAG(vfs) (vfs).f_flags
      90             : #endif
      91             : 
      92             : using namespace llvm;
      93             : 
      94             : namespace llvm {
      95             : namespace sys  {
      96             : namespace fs {
      97             : 
      98             : const file_t kInvalidFile = -1;
      99             : 
     100             : #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||     \
     101             :     defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) ||   \
     102             :     defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX)
     103             : static int
     104           0 : test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
     105             : {
     106             :   struct stat sb;
     107             :   char fullpath[PATH_MAX];
     108             : 
     109           0 :   snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
     110           0 :   if (!realpath(fullpath, ret))
     111             :     return 1;
     112           0 :   if (stat(fullpath, &sb) != 0)
     113           0 :     return 1;
     114             : 
     115             :   return 0;
     116             : }
     117             : 
     118             : static char *
     119           0 : getprogpath(char ret[PATH_MAX], const char *bin)
     120             : {
     121             :   char *pv, *s, *t;
     122             : 
     123             :   /* First approach: absolute path. */
     124           0 :   if (bin[0] == '/') {
     125           0 :     if (test_dir(ret, "/", bin) == 0)
     126             :       return ret;
     127           0 :     return nullptr;
     128             :   }
     129             : 
     130             :   /* Second approach: relative path. */
     131           0 :   if (strchr(bin, '/')) {
     132             :     char cwd[PATH_MAX];
     133           0 :     if (!getcwd(cwd, PATH_MAX))
     134             :       return nullptr;
     135           0 :     if (test_dir(ret, cwd, bin) == 0)
     136             :       return ret;
     137           0 :     return nullptr;
     138             :   }
     139             : 
     140             :   /* Third approach: $PATH */
     141           0 :   if ((pv = getenv("PATH")) == nullptr)
     142             :     return nullptr;
     143           0 :   s = pv = strdup(pv);
     144           0 :   if (!pv)
     145             :     return nullptr;
     146           0 :   while ((t = strsep(&s, ":")) != nullptr) {
     147           0 :     if (test_dir(ret, t, bin) == 0) {
     148           0 :       free(pv);
     149           0 :       return ret;
     150             :     }
     151             :   }
     152           0 :   free(pv);
     153           0 :   return nullptr;
     154             : }
     155             : #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
     156             : 
     157             : /// GetMainExecutable - Return the path to the main executable, given the
     158             : /// value of argv[0] from program startup.
     159       40677 : std::string getMainExecutable(const char *argv0, void *MainAddr) {
     160             : #if defined(__APPLE__)
     161             :   // On OS X the executable path is saved to the stack by dyld. Reading it
     162             :   // from there is much faster than calling dladdr, especially for large
     163             :   // binaries with symbols.
     164             :   char exe_path[MAXPATHLEN];
     165             :   uint32_t size = sizeof(exe_path);
     166             :   if (_NSGetExecutablePath(exe_path, &size) == 0) {
     167             :     char link_path[MAXPATHLEN];
     168             :     if (realpath(exe_path, link_path))
     169             :       return link_path;
     170             :   }
     171             : #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||   \
     172             :     defined(__minix) || defined(__DragonFly__) ||                              \
     173             :     defined(__FreeBSD_kernel__) || defined(_AIX)
     174             :   char exe_path[PATH_MAX];
     175             : 
     176             :   if (getprogpath(exe_path, argv0) != NULL)
     177             :     return exe_path;
     178             : #elif defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__)
     179             :   char exe_path[MAXPATHLEN];
     180             :   StringRef aPath("/proc/self/exe");
     181       40677 :   if (sys::fs::exists(aPath)) {
     182             :       // /proc is not always mounted under Linux (chroot for example).
     183       81354 :       ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
     184       40677 :       if (len >= 0)
     185       40677 :           return std::string(exe_path, len);
     186             :   } else {
     187             :       // Fall back to the classical detection.
     188           0 :       if (getprogpath(exe_path, argv0))
     189           0 :         return exe_path;
     190             :   }
     191             : #elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
     192             :   // Use dladdr to get executable path if available.
     193             :   Dl_info DLInfo;
     194             :   int err = dladdr(MainAddr, &DLInfo);
     195             :   if (err == 0)
     196             :     return "";
     197             : 
     198             :   // If the filename is a symlink, we need to resolve and return the location of
     199             :   // the actual executable.
     200             :   char link_path[MAXPATHLEN];
     201             :   if (realpath(DLInfo.dli_fname, link_path))
     202             :     return link_path;
     203             : #else
     204             : #error GetMainExecutable is not implemented on this host yet.
     205             : #endif
     206           0 :   return "";
     207             : }
     208             : 
     209          80 : TimePoint<> basic_file_status::getLastAccessedTime() const {
     210         160 :   return toTimePoint(fs_st_atime);
     211             : }
     212             : 
     213     1490045 : TimePoint<> basic_file_status::getLastModificationTime() const {
     214     2980090 :   return toTimePoint(fs_st_mtime);
     215             : }
     216             : 
     217     1566760 : UniqueID file_status::getUniqueID() const {
     218     1566760 :   return UniqueID(fs_st_dev, fs_st_ino);
     219             : }
     220             : 
     221           0 : uint32_t file_status::getLinkCount() const {
     222           0 :   return fs_st_nlinks;
     223             : }
     224             : 
     225          25 : ErrorOr<space_info> disk_space(const Twine &Path) {
     226             :   struct STATVFS Vfs;
     227          50 :   if (::STATVFS(Path.str().c_str(), &Vfs))
     228           0 :     return std::error_code(errno, std::generic_category());
     229          25 :   auto FrSize = STATVFS_F_FRSIZE(Vfs);
     230             :   space_info SpaceInfo;
     231          25 :   SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
     232          25 :   SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
     233          25 :   SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
     234             :   return SpaceInfo;
     235             : }
     236             : 
     237       40414 : std::error_code current_path(SmallVectorImpl<char> &result) {
     238             :   result.clear();
     239             : 
     240       40414 :   const char *pwd = ::getenv("PWD");
     241       40414 :   llvm::sys::fs::file_status PWDStatus, DotStatus;
     242       33247 :   if (pwd && llvm::sys::path::is_absolute(pwd) &&
     243       33247 :       !llvm::sys::fs::status(pwd, PWDStatus) &&
     244       73661 :       !llvm::sys::fs::status(".", DotStatus) &&
     245       45925 :       PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
     246       27736 :     result.append(pwd, pwd + strlen(pwd));
     247       27736 :     return std::error_code();
     248             :   }
     249             : 
     250             : #ifdef MAXPATHLEN
     251             :   result.reserve(MAXPATHLEN);
     252             : #else
     253             : // For GNU Hurd
     254             :   result.reserve(1024);
     255             : #endif
     256             : 
     257             :   while (true) {
     258       25356 :     if (::getcwd(result.data(), result.capacity()) == nullptr) {
     259             :       // See if there was a real error.
     260           0 :       if (errno != ENOMEM)
     261           0 :         return std::error_code(errno, std::generic_category());
     262             :       // Otherwise there just wasn't enough space.
     263           0 :       result.reserve(result.capacity() * 2);
     264             :     } else
     265             :       break;
     266             :   }
     267             : 
     268       12678 :   result.set_size(strlen(result.data()));
     269       12678 :   return std::error_code();
     270             : }
     271             : 
     272       11023 : std::error_code set_current_path(const Twine &path) {
     273             :   SmallString<128> path_storage;
     274       11023 :   StringRef p = path.toNullTerminatedStringRef(path_storage);
     275             : 
     276       11023 :   if (::chdir(p.begin()) == -1)
     277         115 :     return std::error_code(errno, std::generic_category());
     278             : 
     279       10908 :   return std::error_code();
     280             : }
     281             : 
     282        3541 : std::error_code create_directory(const Twine &path, bool IgnoreExisting,
     283             :                                  perms Perms) {
     284             :   SmallString<128> path_storage;
     285        3541 :   StringRef p = path.toNullTerminatedStringRef(path_storage);
     286             : 
     287        3541 :   if (::mkdir(p.begin(), Perms) == -1) {
     288        2205 :     if (errno != EEXIST || !IgnoreExisting)
     289        1128 :       return std::error_code(errno, std::generic_category());
     290             :   }
     291             : 
     292        2413 :   return std::error_code();
     293             : }
     294             : 
     295             : // Note that we are using symbolic link because hard links are not supported by
     296             : // all filesystems (SMB doesn't).
     297        1768 : std::error_code create_link(const Twine &to, const Twine &from) {
     298             :   // Get arguments.
     299             :   SmallString<128> from_storage;
     300             :   SmallString<128> to_storage;
     301        1768 :   StringRef f = from.toNullTerminatedStringRef(from_storage);
     302        1768 :   StringRef t = to.toNullTerminatedStringRef(to_storage);
     303             : 
     304        1768 :   if (::symlink(t.begin(), f.begin()) == -1)
     305           0 :     return std::error_code(errno, std::generic_category());
     306             : 
     307        1768 :   return std::error_code();
     308             : }
     309             : 
     310           4 : std::error_code create_hard_link(const Twine &to, const Twine &from) {
     311             :   // Get arguments.
     312             :   SmallString<128> from_storage;
     313             :   SmallString<128> to_storage;
     314           4 :   StringRef f = from.toNullTerminatedStringRef(from_storage);
     315           4 :   StringRef t = to.toNullTerminatedStringRef(to_storage);
     316             : 
     317           4 :   if (::link(t.begin(), f.begin()) == -1)
     318           0 :     return std::error_code(errno, std::generic_category());
     319             : 
     320           4 :   return std::error_code();
     321             : }
     322             : 
     323       15510 : std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
     324             :   SmallString<128> path_storage;
     325       15510 :   StringRef p = path.toNullTerminatedStringRef(path_storage);
     326             : 
     327             :   struct stat buf;
     328       15510 :   if (lstat(p.begin(), &buf) != 0) {
     329        2377 :     if (errno != ENOENT || !IgnoreNonExisting)
     330           1 :       return std::error_code(errno, std::generic_category());
     331        2376 :     return std::error_code();
     332             :   }
     333             : 
     334             :   // Note: this check catches strange situations. In all cases, LLVM should
     335             :   // only be involved in the creation and deletion of regular files.  This
     336             :   // check ensures that what we're trying to erase is a regular file. It
     337             :   // effectively prevents LLVM from erasing things like /dev/null, any block
     338             :   // special file, or other things that aren't "regular" files.
     339       13133 :   if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
     340             :     return make_error_code(errc::operation_not_permitted);
     341             : 
     342       12807 :   if (::remove(p.begin()) == -1) {
     343           2 :     if (errno != ENOENT || !IgnoreNonExisting)
     344           2 :       return std::error_code(errno, std::generic_category());
     345             :   }
     346             : 
     347       12805 :   return std::error_code();
     348             : }
     349             : 
     350           0 : static bool is_local_impl(struct STATVFS &Vfs) {
     351             : #if defined(__linux__)
     352             : #ifndef NFS_SUPER_MAGIC
     353             : #define NFS_SUPER_MAGIC 0x6969
     354             : #endif
     355             : #ifndef SMB_SUPER_MAGIC
     356             : #define SMB_SUPER_MAGIC 0x517B
     357             : #endif
     358             : #ifndef CIFS_MAGIC_NUMBER
     359             : #define CIFS_MAGIC_NUMBER 0xFF534D42
     360             : #endif
     361           0 :   switch ((uint32_t)Vfs.f_type) {
     362             :   case NFS_SUPER_MAGIC:
     363             :   case SMB_SUPER_MAGIC:
     364             :   case CIFS_MAGIC_NUMBER:
     365             :     return false;
     366           0 :   default:
     367           0 :     return true;
     368             :   }
     369             : #elif defined(__CYGWIN__)
     370             :   // Cygwin doesn't expose this information; would need to use Win32 API.
     371             :   return false;
     372             : #elif defined(__Fuchsia__)
     373             :   // Fuchsia doesn't yet support remote filesystem mounts.
     374             :   return true;
     375             : #elif defined(__HAIKU__)
     376             :   // Haiku doesn't expose this information.
     377             :   return false;
     378             : #elif defined(__sun)
     379             :   // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
     380             :   StringRef fstype(Vfs.f_basetype);
     381             :   // NFS is the only non-local fstype??
     382             :   return !fstype.equals("nfs");
     383             : #else
     384             :   return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
     385             : #endif
     386             : }
     387             : 
     388           0 : std::error_code is_local(const Twine &Path, bool &Result) {
     389             :   struct STATVFS Vfs;
     390           0 :   if (::STATVFS(Path.str().c_str(), &Vfs))
     391           0 :     return std::error_code(errno, std::generic_category());
     392             : 
     393           0 :   Result = is_local_impl(Vfs);
     394           0 :   return std::error_code();
     395             : }
     396             : 
     397           0 : std::error_code is_local(int FD, bool &Result) {
     398             :   struct STATVFS Vfs;
     399           0 :   if (::FSTATVFS(FD, &Vfs))
     400           0 :     return std::error_code(errno, std::generic_category());
     401             : 
     402           0 :   Result = is_local_impl(Vfs);
     403           0 :   return std::error_code();
     404             : }
     405             : 
     406       14891 : std::error_code rename(const Twine &from, const Twine &to) {
     407             :   // Get arguments.
     408             :   SmallString<128> from_storage;
     409             :   SmallString<128> to_storage;
     410       14891 :   StringRef f = from.toNullTerminatedStringRef(from_storage);
     411       14891 :   StringRef t = to.toNullTerminatedStringRef(to_storage);
     412             : 
     413       14891 :   if (::rename(f.begin(), t.begin()) == -1)
     414           0 :     return std::error_code(errno, std::generic_category());
     415             : 
     416       14891 :   return std::error_code();
     417             : }
     418             : 
     419        5328 : std::error_code resize_file(int FD, uint64_t Size) {
     420             : #if defined(HAVE_POSIX_FALLOCATE)
     421             :   // If we have posix_fallocate use it. Unlike ftruncate it always allocates
     422             :   // space, so we get an error if the disk is full.
     423        5328 :   if (int Err = ::posix_fallocate(FD, 0, Size)) {
     424           0 :     if (Err != EINVAL && Err != EOPNOTSUPP)
     425           0 :       return std::error_code(Err, std::generic_category());
     426             :   }
     427             : #endif
     428             :   // Use ftruncate as a fallback. It may or may not allocate space. At least on
     429             :   // OS X with HFS+ it does.
     430        5328 :   if (::ftruncate(FD, Size) == -1)
     431           0 :     return std::error_code(errno, std::generic_category());
     432             : 
     433        5328 :   return std::error_code();
     434             : }
     435             : 
     436             : static int convertAccessMode(AccessMode Mode) {
     437             :   switch (Mode) {
     438             :   case AccessMode::Exist:
     439             :     return F_OK;
     440             :   case AccessMode::Write:
     441             :     return W_OK;
     442             :   case AccessMode::Execute:
     443             :     return R_OK | X_OK; // scripts also need R_OK.
     444             :   }
     445           0 :   llvm_unreachable("invalid enum");
     446             : }
     447             : 
     448      541969 : std::error_code access(const Twine &Path, AccessMode Mode) {
     449             :   SmallString<128> PathStorage;
     450      541969 :   StringRef P = Path.toNullTerminatedStringRef(PathStorage);
     451             : 
     452      541969 :   if (::access(P.begin(), convertAccessMode(Mode)) == -1)
     453      388130 :     return std::error_code(errno, std::generic_category());
     454             : 
     455      153839 :   if (Mode == AccessMode::Execute) {
     456             :     // Don't say that directories are executable.
     457             :     struct stat buf;
     458        9554 :     if (0 != stat(P.begin(), &buf))
     459           0 :       return errc::permission_denied;
     460        9554 :     if (!S_ISREG(buf.st_mode))
     461           1 :       return errc::permission_denied;
     462             :   }
     463             : 
     464      153838 :   return std::error_code();
     465             : }
     466             : 
     467      264694 : bool can_execute(const Twine &Path) {
     468      264694 :   return !access(Path, AccessMode::Execute);
     469             : }
     470             : 
     471         243 : bool equivalent(file_status A, file_status B) {
     472             :   assert(status_known(A) && status_known(B));
     473         243 :   return A.fs_st_dev == B.fs_st_dev &&
     474         243 :          A.fs_st_ino == B.fs_st_ino;
     475             : }
     476             : 
     477         250 : std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
     478         250 :   file_status fsA, fsB;
     479         250 :   if (std::error_code ec = status(A, fsA))
     480           4 :     return ec;
     481         246 :   if (std::error_code ec = status(B, fsB))
     482           5 :     return ec;
     483         241 :   result = equivalent(fsA, fsB);
     484         241 :   return std::error_code();
     485             : }
     486             : 
     487           0 : static void expandTildeExpr(SmallVectorImpl<char> &Path) {
     488           0 :   StringRef PathStr(Path.begin(), Path.size());
     489           0 :   if (PathStr.empty() || !PathStr.startswith("~"))
     490           0 :     return;
     491             : 
     492           0 :   PathStr = PathStr.drop_front();
     493             :   StringRef Expr =
     494           0 :       PathStr.take_until([](char c) { return path::is_separator(c); });
     495           0 :   StringRef Remainder = PathStr.substr(Expr.size() + 1);
     496             :   SmallString<128> Storage;
     497           0 :   if (Expr.empty()) {
     498             :     // This is just ~/..., resolve it to the current user's home dir.
     499           0 :     if (!path::home_directory(Storage)) {
     500             :       // For some reason we couldn't get the home directory.  Just exit.
     501             :       return;
     502             :     }
     503             : 
     504             :     // Overwrite the first character and insert the rest.
     505           0 :     Path[0] = Storage[0];
     506           0 :     Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
     507           0 :     return;
     508             :   }
     509             : 
     510             :   // This is a string of the form ~username/, look up this user's entry in the
     511             :   // password database.
     512             :   struct passwd *Entry = nullptr;
     513             :   std::string User = Expr.str();
     514           0 :   Entry = ::getpwnam(User.c_str());
     515             : 
     516           0 :   if (!Entry) {
     517             :     // Unable to look up the entry, just return back the original path.
     518             :     return;
     519             :   }
     520             : 
     521             :   Storage = Remainder;
     522             :   Path.clear();
     523           0 :   Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
     524           0 :   llvm::sys::path::append(Path, Storage);
     525             : }
     526             : 
     527             : static file_type typeForMode(mode_t Mode) {
     528     1791875 :   if (S_ISDIR(Mode))
     529             :     return file_type::directory_file;
     530     1061047 :   else if (S_ISREG(Mode))
     531             :     return file_type::regular_file;
     532        1618 :   else if (S_ISBLK(Mode))
     533             :     return file_type::block_file;
     534        1618 :   else if (S_ISCHR(Mode))
     535             :     return file_type::character_file;
     536         677 :   else if (S_ISFIFO(Mode))
     537             :     return file_type::fifo_file;
     538         674 :   else if (S_ISSOCK(Mode))
     539             :     return file_type::socket_file;
     540         674 :   else if (S_ISLNK(Mode))
     541             :     return file_type::symlink_file;
     542             :   return file_type::type_unknown;
     543             : }
     544             : 
     545     2516362 : static std::error_code fillStatus(int StatRet, const struct stat &Status,
     546             :                                   file_status &Result) {
     547     2516362 :   if (StatRet != 0) {
     548      774151 :     std::error_code EC(errno, std::generic_category());
     549             :     if (EC == errc::no_such_file_or_directory)
     550      774069 :       Result = file_status(file_type::file_not_found);
     551             :     else
     552          82 :       Result = file_status(file_type::status_error);
     553      774151 :     return EC;
     554             :   }
     555             : 
     556     1742211 :   perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
     557     1742211 :   Result = file_status(typeForMode(Status.st_mode), Perms, Status.st_dev,
     558     1742211 :                        Status.st_nlink, Status.st_ino, Status.st_atime,
     559     1742211 :                        Status.st_mtime, Status.st_uid, Status.st_gid,
     560     1742211 :                        Status.st_size);
     561             : 
     562     1742211 :   return std::error_code();
     563             : }
     564             : 
     565     1616172 : std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
     566             :   SmallString<128> PathStorage;
     567     1616172 :   StringRef P = Path.toNullTerminatedStringRef(PathStorage);
     568             : 
     569             :   struct stat Status;
     570     1616201 :   int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
     571     1616172 :   return fillStatus(StatRet, Status, Result);
     572             : }
     573             : 
     574      900194 : std::error_code status(int FD, file_status &Result) {
     575             :   struct stat Status;
     576             :   int StatRet = ::fstat(FD, &Status);
     577      900194 :   return fillStatus(StatRet, Status, Result);
     578             : }
     579             : 
     580          27 : std::error_code setPermissions(const Twine &Path, perms Permissions) {
     581             :   SmallString<128> PathStorage;
     582          27 :   StringRef P = Path.toNullTerminatedStringRef(PathStorage);
     583             : 
     584          27 :   if (::chmod(P.begin(), Permissions))
     585           0 :     return std::error_code(errno, std::generic_category());
     586          27 :   return std::error_code();
     587             : }
     588             : 
     589           7 : std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime,
     590             :                                                  TimePoint<> ModificationTime) {
     591             : #if defined(HAVE_FUTIMENS)
     592             :   timespec Times[2];
     593           7 :   Times[0] = sys::toTimeSpec(AccessTime);
     594           7 :   Times[1] = sys::toTimeSpec(ModificationTime);
     595           7 :   if (::futimens(FD, Times))
     596           0 :     return std::error_code(errno, std::generic_category());
     597           7 :   return std::error_code();
     598             : #elif defined(HAVE_FUTIMES)
     599             :   timeval Times[2];
     600             :   Times[0] = sys::toTimeVal(
     601             :       std::chrono::time_point_cast<std::chrono::microseconds>(AccessTime));
     602             :   Times[1] =
     603             :       sys::toTimeVal(std::chrono::time_point_cast<std::chrono::microseconds>(
     604             :           ModificationTime));
     605             :   if (::futimes(FD, Times))
     606             :     return std::error_code(errno, std::generic_category());
     607             :   return std::error_code();
     608             : #else
     609             : #warning Missing futimes() and futimens()
     610             :   return make_error_code(errc::function_not_supported);
     611             : #endif
     612             : }
     613             : 
     614      169645 : std::error_code mapped_file_region::init(int FD, uint64_t Offset,
     615             :                                          mapmode Mode) {
     616             :   assert(Size != 0);
     617             : 
     618      169645 :   int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
     619      169645 :   int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
     620             : #if defined(__APPLE__)
     621             :   //----------------------------------------------------------------------
     622             :   // Newer versions of MacOSX have a flag that will allow us to read from
     623             :   // binaries whose code signature is invalid without crashing by using
     624             :   // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
     625             :   // is mapped we can avoid crashing and return zeroes to any pages we try
     626             :   // to read if the media becomes unavailable by using the
     627             :   // MAP_RESILIENT_MEDIA flag.  These flags are only usable when mapping
     628             :   // with PROT_READ, so take care not to specify them otherwise.
     629             :   //----------------------------------------------------------------------
     630             :   if (Mode == readonly) {
     631             : #if defined(MAP_RESILIENT_CODESIGN)
     632             :     flags |= MAP_RESILIENT_CODESIGN;
     633             : #endif
     634             : #if defined(MAP_RESILIENT_MEDIA)
     635             :     flags |= MAP_RESILIENT_MEDIA;
     636             : #endif
     637             :   }
     638             : #endif // #if defined (__APPLE__)
     639             : 
     640      169645 :   Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
     641      169645 :   if (Mapping == MAP_FAILED)
     642           0 :     return std::error_code(errno, std::generic_category());
     643      169645 :   return std::error_code();
     644             : }
     645             : 
     646      169645 : mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
     647      169645 :                                        uint64_t offset, std::error_code &ec)
     648      169645 :     : Size(length), Mapping(), Mode(mode) {
     649             :   (void)Mode;
     650      169645 :   ec = init(fd, offset, mode);
     651      169645 :   if (ec)
     652           0 :     Mapping = nullptr;
     653      169645 : }
     654             : 
     655       70528 : mapped_file_region::~mapped_file_region() {
     656       35264 :   if (Mapping)
     657       35264 :     ::munmap(Mapping, Size);
     658       35264 : }
     659             : 
     660         784 : size_t mapped_file_region::size() const {
     661             :   assert(Mapping && "Mapping failed but used anyway!");
     662         784 :   return Size;
     663             : }
     664             : 
     665      337695 : char *mapped_file_region::data() const {
     666             :   assert(Mapping && "Mapping failed but used anyway!");
     667      337695 :   return reinterpret_cast<char*>(Mapping);
     668             : }
     669             : 
     670      164210 : const char *mapped_file_region::const_data() const {
     671             :   assert(Mapping && "Mapping failed but used anyway!");
     672      164210 :   return reinterpret_cast<const char*>(Mapping);
     673             : }
     674             : 
     675      492627 : int mapped_file_region::alignment() {
     676      492627 :   return Process::getPageSize();
     677             : }
     678             : 
     679     4321384 : std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
     680             :                                                      StringRef path,
     681             :                                                      bool follow_symlinks) {
     682             :   SmallString<128> path_null(path);
     683     4321408 :   DIR *directory = ::opendir(path_null.c_str());
     684     4321459 :   if (!directory)
     685     4280397 :     return std::error_code(errno, std::generic_category());
     686             : 
     687       41062 :   it.IterationHandle = reinterpret_cast<intptr_t>(directory);
     688             :   // Add something for replace_filename to replace.
     689       41062 :   path::append(path_null, ".");
     690       41062 :   it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
     691       41062 :   return directory_iterator_increment(it);
     692             : }
     693             : 
     694     4362499 : std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
     695     4362499 :   if (it.IterationHandle)
     696       41062 :     ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
     697     4362499 :   it.IterationHandle = 0;
     698     4362499 :   it.CurrentEntry = directory_entry();
     699     4362513 :   return std::error_code();
     700             : }
     701             : 
     702           0 : static file_type direntType(dirent* Entry) {
     703             :   // Most platforms provide the file type in the dirent: Linux/BSD/Mac.
     704             :   // The DTTOIF macro lets us reuse our status -> type conversion.
     705             : #if defined(_DIRENT_HAVE_D_TYPE) && defined(DTTOIF)
     706           0 :   return typeForMode(DTTOIF(Entry->d_type));
     707             : #else
     708             :   // Other platforms such as Solaris require a stat() to get the type.
     709             :   return file_type::type_unknown;
     710             : #endif
     711             : }
     712             : 
     713      172802 : std::error_code detail::directory_iterator_increment(detail::DirIterState &It) {
     714      172802 :   errno = 0;
     715      172802 :   dirent *CurDir = ::readdir(reinterpret_cast<DIR *>(It.IterationHandle));
     716      172802 :   if (CurDir == nullptr && errno != 0) {
     717           0 :     return std::error_code(errno, std::generic_category());
     718      172802 :   } else if (CurDir != nullptr) {
     719      131756 :     StringRef Name(CurDir->d_name);
     720      131756 :     if ((Name.size() == 1 && Name[0] == '.') ||
     721       41087 :         (Name.size() == 2 && Name[0] == '.' && Name[1] == '.'))
     722       82092 :       return directory_iterator_increment(It);
     723      108440 :     It.CurrentEntry.replace_filename(Name, direntType(CurDir));
     724             :   } else
     725       41046 :     return directory_iterator_destruct(It);
     726             : 
     727       49664 :   return std::error_code();
     728             : }
     729             : 
     730         238 : ErrorOr<basic_file_status> directory_entry::status() const {
     731         238 :   file_status s;
     732         476 :   if (auto EC = fs::status(Path, s, FollowSymlinks))
     733          13 :     return EC;
     734             :   return s;
     735             : }
     736             : 
     737             : #if !defined(F_GETPATH)
     738      804581 : static bool hasProcSelfFD() {
     739             :   // If we have a /proc filesystem mounted, we can quickly establish the
     740             :   // real name of the file with readlink
     741      804581 :   static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
     742      804581 :   return Result;
     743             : }
     744             : #endif
     745             : 
     746     2233690 : static int nativeOpenFlags(CreationDisposition Disp, OpenFlags Flags,
     747             :                            FileAccess Access) {
     748             :   int Result = 0;
     749     2233690 :   if (Access == FA_Read)
     750             :     Result |= O_RDONLY;
     751       36505 :   else if (Access == FA_Write)
     752             :     Result |= O_WRONLY;
     753       25878 :   else if (Access == (FA_Read | FA_Write))
     754             :     Result |= O_RDWR;
     755             : 
     756             :   // This is for compatibility with old code that assumed F_Append implied
     757             :   // would open an existing file.  See Windows/Path.inc for a longer comment.
     758     2233690 :   if (Flags & F_Append)
     759             :     Disp = CD_OpenAlways;
     760             : 
     761     2233685 :   if (Disp == CD_CreateNew) {
     762             :     Result |= O_CREAT; // Create if it doesn't exist.
     763       25740 :     Result |= O_EXCL;  // Fail if it does.
     764     2207950 :   } else if (Disp == CD_CreateAlways) {
     765             :     Result |= O_CREAT; // Create if it doesn't exist.
     766       10744 :     Result |= O_TRUNC; // Truncate if it does.
     767     2197206 :   } else if (Disp == CD_OpenAlways) {
     768           9 :     Result |= O_CREAT; // Create if it doesn't exist.
     769             :   } else if (Disp == CD_OpenExisting) {
     770             :     // Nothing special, just don't add O_CREAT and we get these semantics.
     771             :   }
     772             : 
     773     2233690 :   if (Flags & F_Append)
     774           7 :     Result |= O_APPEND;
     775             : 
     776             : #ifdef O_CLOEXEC
     777     2233690 :   if (!(Flags & OF_ChildInherit))
     778     2233690 :     Result |= O_CLOEXEC;
     779             : #endif
     780             : 
     781     2233690 :   return Result;
     782             : }
     783             : 
     784     2233692 : std::error_code openFile(const Twine &Name, int &ResultFD,
     785             :                          CreationDisposition Disp, FileAccess Access,
     786             :                          OpenFlags Flags, unsigned Mode) {
     787     2233692 :   int OpenFlags = nativeOpenFlags(Disp, Flags, Access);
     788             : 
     789             :   SmallString<128> Storage;
     790     2233692 :   StringRef P = Name.toNullTerminatedStringRef(Storage);
     791             :   // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
     792             :   // when open is overloaded, such as in Bionic.
     793     2233691 :   auto Open = [&]() { return ::open(P.begin(), OpenFlags, Mode); };
     794     2233691 :   if ((ResultFD = sys::RetryAfterSignal(-1, Open)) < 0)
     795     1177606 :     return std::error_code(errno, std::generic_category());
     796             : #ifndef O_CLOEXEC
     797             :   if (!(Flags & OF_ChildInherit)) {
     798             :     int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
     799             :     (void)r;
     800             :     assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
     801             :   }
     802             : #endif
     803     1056089 :   return std::error_code();
     804             : }
     805             : 
     806           0 : Expected<int> openNativeFile(const Twine &Name, CreationDisposition Disp,
     807             :                              FileAccess Access, OpenFlags Flags,
     808             :                              unsigned Mode) {
     809             : 
     810             :   int FD;
     811           0 :   std::error_code EC = openFile(Name, FD, Disp, Access, Flags, Mode);
     812           0 :   if (EC)
     813           0 :     return errorCodeToError(EC);
     814             :   return FD;
     815             : }
     816             : 
     817     2197187 : std::error_code openFileForRead(const Twine &Name, int &ResultFD,
     818             :                                 OpenFlags Flags,
     819             :                                 SmallVectorImpl<char> *RealPath) {
     820             :   std::error_code EC =
     821     2197187 :       openFile(Name, ResultFD, CD_OpenExisting, FA_Read, Flags, 0666);
     822     2197190 :   if (EC)
     823     1177014 :     return EC;
     824             : 
     825             :   // Attempt to get the real name of the file, if the user asked
     826     1020176 :   if(!RealPath)
     827      215595 :     return std::error_code();
     828             :   RealPath->clear();
     829             : #if defined(F_GETPATH)
     830             :   // When F_GETPATH is availble, it is the quickest way to get
     831             :   // the real path name.
     832             :   char Buffer[MAXPATHLEN];
     833             :   if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
     834             :     RealPath->append(Buffer, Buffer + strlen(Buffer));
     835             : #else
     836             :   char Buffer[PATH_MAX];
     837      804581 :   if (hasProcSelfFD()) {
     838             :     char ProcPath[64];
     839      804581 :     snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
     840      804581 :     ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
     841      804581 :     if (CharCount > 0)
     842      804581 :       RealPath->append(Buffer, Buffer + CharCount);
     843             :   } else {
     844             :     SmallString<128> Storage;
     845           0 :     StringRef P = Name.toNullTerminatedStringRef(Storage);
     846             : 
     847             :     // Use ::realpath to get the real path name
     848           0 :     if (::realpath(P.begin(), Buffer) != nullptr)
     849           0 :       RealPath->append(Buffer, Buffer + strlen(Buffer));
     850             :   }
     851             : #endif
     852      804581 :   return std::error_code();
     853             : }
     854             : 
     855           0 : Expected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags,
     856             :                                        SmallVectorImpl<char> *RealPath) {
     857             :   file_t ResultFD;
     858           0 :   std::error_code EC = openFileForRead(Name, ResultFD, Flags, RealPath);
     859           0 :   if (EC)
     860           0 :     return errorCodeToError(EC);
     861             :   return ResultFD;
     862             : }
     863             : 
     864           0 : void closeFile(file_t &F) {
     865           0 :   ::close(F);
     866           0 :   F = kInvalidFile;
     867           0 : }
     868             : 
     869             : template <typename T>
     870          16 : static std::error_code remove_directories_impl(const T &Entry,
     871             :                                                bool IgnoreErrors) {
     872             :   std::error_code EC;
     873          16 :   directory_iterator Begin(Entry, EC, false);
     874          16 :   directory_iterator End;
     875          37 :   while (Begin != End) {
     876             :     auto &Item = *Begin;
     877          21 :     ErrorOr<basic_file_status> st = Item.status();
     878          21 :     if (!st && !IgnoreErrors)
     879             :       return st.getError();
     880             : 
     881          21 :     if (is_directory(*st)) {
     882          11 :       EC = remove_directories_impl(Item, IgnoreErrors);
     883          11 :       if (EC && !IgnoreErrors)
     884           0 :         return EC;
     885             :     }
     886             : 
     887          21 :     EC = fs::remove(Item.path(), true);
     888          21 :     if (EC && !IgnoreErrors)
     889           0 :       return EC;
     890             : 
     891             :     Begin.increment(EC);
     892          21 :     if (EC && !IgnoreErrors)
     893           0 :       return EC;
     894             :   }
     895          16 :   return std::error_code();
     896             : }
     897          11 : 
     898             : std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
     899             :   auto EC = remove_directories_impl(path, IgnoreErrors);
     900          11 :   if (EC && !IgnoreErrors)
     901          11 :     return EC;
     902          25 :   EC = fs::remove(path, true);
     903             :   if (EC && !IgnoreErrors)
     904          14 :     return EC;
     905          14 :   return std::error_code();
     906             : }
     907             : 
     908          14 : std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
     909           7 :                           bool expand_tilde) {
     910           7 :   dest.clear();
     911           0 :   if (path.isTriviallyEmpty())
     912             :     return std::error_code();
     913             : 
     914          14 :   if (expand_tilde) {
     915          14 :     SmallString<128> Storage;
     916           0 :     path.toVector(Storage);
     917             :     expandTildeExpr(Storage);
     918             :     return real_path(Storage, dest, false);
     919          14 :   }
     920           0 : 
     921             :   SmallString<128> Storage;
     922          11 :   StringRef P = path.toNullTerminatedStringRef(Storage);
     923             :   char Buffer[PATH_MAX];
     924           5 :   if (::realpath(P.begin(), Buffer) == nullptr)
     925             :     return std::error_code(errno, std::generic_category());
     926             :   dest.append(Buffer, Buffer + strlen(Buffer));
     927           5 :   return std::error_code();
     928           5 : }
     929          12 : 
     930             : } // end namespace fs
     931           7 : 
     932           7 : namespace path {
     933             : 
     934             : bool home_directory(SmallVectorImpl<char> &result) {
     935           7 :   char *RequestedDir = getenv("HOME");
     936           4 :   if (!RequestedDir) {
     937           4 :     struct passwd *pw = getpwuid(getuid());
     938           0 :     if (pw && pw->pw_dir)
     939             :       RequestedDir = pw->pw_dir;
     940             :   }
     941           7 :   if (!RequestedDir)
     942           7 :     return false;
     943           0 : 
     944             :   result.clear();
     945             :   result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
     946           7 :   return true;
     947           0 : }
     948             : 
     949           5 : static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
     950             :   #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
     951             :   // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
     952           5 :   // macros defined in <unistd.h> on darwin >= 9
     953           5 :   int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
     954           5 :                          : _CS_DARWIN_USER_CACHE_DIR;
     955           0 :   size_t ConfLen = confstr(ConfName, nullptr, 0);
     956           5 :   if (ConfLen > 0) {
     957           5 :     do {
     958           0 :       Result.resize(ConfLen);
     959           5 :       ConfLen = confstr(ConfName, Result.data(), Result.size());
     960             :     } while (ConfLen > 0 && ConfLen != Result.size());
     961             : 
     962        1409 :     if (ConfLen > 0) {
     963             :       assert(Result.back() == 0);
     964             :       Result.pop_back();
     965             :       return true;
     966           0 :     }
     967             : 
     968        1409 :     Result.clear();
     969             :   }
     970           0 :   #endif
     971           0 :   return false;
     972           0 : }
     973             : 
     974             : static const char *getEnvTempDir() {
     975             :   // Check whether the temporary directory is specified by an environment
     976        1409 :   // variable.
     977             :   const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
     978        1409 :   for (const char *Env : EnvironmentVariables) {
     979          65 :     if (const char *Dir = std::getenv(Env))
     980        1344 :       return Dir;
     981        1344 :   }
     982             : 
     983             :   return nullptr;
     984             : }
     985             : 
     986             : static const char *getDefaultTempDir(bool ErasedOnReboot) {
     987             : #ifdef P_tmpdir
     988         157 :   if ((bool)P_tmpdir)
     989         157 :     return P_tmpdir;
     990         157 : #endif
     991           2 : 
     992           2 :   if (ErasedOnReboot)
     993             :     return "/tmp";
     994             :   return "/var/tmp";
     995         157 : }
     996             : 
     997             : void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
     998             :   Result.clear();
     999         157 : 
    1000         157 :   if (ErasedOnReboot) {
    1001             :     // There is no env variable for the cache directory.
    1002             :     if (const char *RequestedDir = getEnvTempDir()) {
    1003             :       Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
    1004             :       return;
    1005             :     }
    1006             :   }
    1007             : 
    1008             :   if (getDarwinConfDir(ErasedOnReboot, Result))
    1009             :     return;
    1010             : 
    1011             :   const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
    1012             :   Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
    1013             : }
    1014             : 
    1015             : } // end namespace path
    1016             : 
    1017             : } // end namespace sys
    1018             : } // end namespace llvm

Generated by: LCOV version 1.13