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#if HAVE_DIRENT_H 35# include <dirent.h> 36# define NAMLEN(dirent) strlen((dirent)->d_name) 37#else 38# define dirent direct 39# define NAMLEN(dirent) (dirent)->d_namlen 40# if HAVE_SYS_NDIR_H 41# include <sys/ndir.h> 42# endif 43# if HAVE_SYS_DIR_H 44# include <sys/dir.h> 45# endif 46# if HAVE_NDIR_H 47# include <ndir.h> 48# endif 49#endif 50 51#ifdef __APPLE__ 52#include <mach-o/dyld.h> 53#include <sys/attr.h> 54#endif 55 56// Both stdio.h and cstdio are included via different paths and 57// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros 58// either. 59#undef ferror 60#undef feof 61 62// For GNU Hurd 63#if defined(__GNU__) && !defined(PATH_MAX) 64# define PATH_MAX 4096 65#endif 66 67#include <sys/types.h> 68#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__ANDROID__) 69#include <sys/statvfs.h> 70#define STATVFS statvfs 71#define STATVFS_F_FRSIZE(vfs) vfs.f_frsize 72#else 73#ifdef __OpenBSD__ 74#include <sys/param.h> 75#include <sys/mount.h> 76#elif defined(__ANDROID__) 77#include <sys/vfs.h> 78#else 79#include <sys/mount.h> 80#endif 81#define STATVFS statfs 82#define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize) 83#endif 84 85 86using namespace llvm; 87 88namespace llvm { 89namespace sys { 90namespace fs { 91#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \ 92 defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \ 93 defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__) || \ 94 defined(_AIX) 95static int 96test_dir(char ret[PATH_MAX], const char *dir, const char *bin) 97{ 98 struct stat sb; 99 char fullpath[PATH_MAX]; 100 101 snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin); 102 if (!realpath(fullpath, ret)) 103 return 1; 104 if (stat(fullpath, &sb) != 0) 105 return 1; 106 107 return 0; 108} 109 110static char * 111getprogpath(char ret[PATH_MAX], const char *bin) 112{ 113 char *pv, *s, *t; 114 115 /* First approach: absolute path. */ 116 if (bin[0] == '/') { 117 if (test_dir(ret, "/", bin) == 0) 118 return ret; 119 return nullptr; 120 } 121 122 /* Second approach: relative path. */ 123 if (strchr(bin, '/')) { 124 char cwd[PATH_MAX]; 125 if (!getcwd(cwd, PATH_MAX)) 126 return nullptr; 127 if (test_dir(ret, cwd, bin) == 0) 128 return ret; 129 return nullptr; 130 } 131 132 /* Third approach: $PATH */ 133 if ((pv = getenv("PATH")) == nullptr) 134 return nullptr; 135 s = pv = strdup(pv); 136 if (!pv) 137 return nullptr; 138 while ((t = strsep(&s, ":")) != nullptr) { 139 if (test_dir(ret, t, bin) == 0) { 140 free(pv); 141 return ret; 142 } 143 } 144 free(pv); 145 return nullptr; 146} 147#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__ 148 149/// GetMainExecutable - Return the path to the main executable, given the 150/// value of argv[0] from program startup. 151std::string getMainExecutable(const char *argv0, void *MainAddr) { 152#if defined(__APPLE__) 153 // On OS X the executable path is saved to the stack by dyld. Reading it 154 // from there is much faster than calling dladdr, especially for large 155 // binaries with symbols. 156 char exe_path[MAXPATHLEN]; 157 uint32_t size = sizeof(exe_path); 158 if (_NSGetExecutablePath(exe_path, &size) == 0) { 159 char link_path[MAXPATHLEN]; 160 if (realpath(exe_path, link_path)) 161 return link_path; 162 } 163#elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \ 164 defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \ 165 defined(__FreeBSD_kernel__) || defined(_AIX) 166 char exe_path[PATH_MAX]; 167 168 if (getprogpath(exe_path, argv0) != NULL) 169 return exe_path; 170#elif defined(__linux__) || defined(__CYGWIN__) 171 char exe_path[MAXPATHLEN]; 172 StringRef aPath("/proc/self/exe"); 173 if (sys::fs::exists(aPath)) { 174 // /proc is not always mounted under Linux (chroot for example). 175 ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path)); 176 if (len >= 0) 177 return std::string(exe_path, len); 178 } else { 179 // Fall back to the classical detection. 180 if (getprogpath(exe_path, argv0)) 181 return exe_path; 182 } 183#elif defined(HAVE_DLFCN_H) 184 // Use dladdr to get executable path if available. 185 Dl_info DLInfo; 186 int err = dladdr(MainAddr, &DLInfo); 187 if (err == 0) 188 return ""; 189 190 // If the filename is a symlink, we need to resolve and return the location of 191 // the actual executable. 192 char link_path[MAXPATHLEN]; 193 if (realpath(DLInfo.dli_fname, link_path)) 194 return link_path; 195#else 196#error GetMainExecutable is not implemented on this host yet. 197#endif 198 return ""; 199} 200 201TimePoint<> file_status::getLastAccessedTime() const { 202 return toTimePoint(fs_st_atime); 203} 204 205TimePoint<> file_status::getLastModificationTime() const { 206 return toTimePoint(fs_st_mtime); 207} 208 209UniqueID file_status::getUniqueID() const { 210 return UniqueID(fs_st_dev, fs_st_ino); 211} 212 213ErrorOr<space_info> disk_space(const Twine &Path) { 214 struct STATVFS Vfs; 215 if (::STATVFS(Path.str().c_str(), &Vfs)) 216 return std::error_code(errno, std::generic_category()); 217 auto FrSize = STATVFS_F_FRSIZE(Vfs); 218 space_info SpaceInfo; 219 SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize; 220 SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize; 221 SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize; 222 return SpaceInfo; 223} 224 225std::error_code current_path(SmallVectorImpl<char> &result) { 226 result.clear(); 227 228 const char *pwd = ::getenv("PWD"); 229 llvm::sys::fs::file_status PWDStatus, DotStatus; 230 if (pwd && llvm::sys::path::is_absolute(pwd) && 231 !llvm::sys::fs::status(pwd, PWDStatus) && 232 !llvm::sys::fs::status(".", DotStatus) && 233 PWDStatus.getUniqueID() == DotStatus.getUniqueID()) { 234 result.append(pwd, pwd + strlen(pwd)); 235 return std::error_code(); 236 } 237 238#ifdef MAXPATHLEN 239 result.reserve(MAXPATHLEN); 240#else 241// For GNU Hurd 242 result.reserve(1024); 243#endif 244 245 while (true) { 246 if (::getcwd(result.data(), result.capacity()) == nullptr) { 247 // See if there was a real error. 248 if (errno != ENOMEM) 249 return std::error_code(errno, std::generic_category()); 250 // Otherwise there just wasn't enough space. 251 result.reserve(result.capacity() * 2); 252 } else 253 break; 254 } 255 256 result.set_size(strlen(result.data())); 257 return std::error_code(); 258} 259 260std::error_code create_directory(const Twine &path, bool IgnoreExisting, 261 perms Perms) { 262 SmallString<128> path_storage; 263 StringRef p = path.toNullTerminatedStringRef(path_storage); 264 265 if (::mkdir(p.begin(), Perms) == -1) { 266 if (errno != EEXIST || !IgnoreExisting) 267 return std::error_code(errno, std::generic_category()); 268 } 269 270 return std::error_code(); 271} 272 273// Note that we are using symbolic link because hard links are not supported by 274// all filesystems (SMB doesn't). 275std::error_code create_link(const Twine &to, const Twine &from) { 276 // Get arguments. 277 SmallString<128> from_storage; 278 SmallString<128> to_storage; 279 StringRef f = from.toNullTerminatedStringRef(from_storage); 280 StringRef t = to.toNullTerminatedStringRef(to_storage); 281 282 if (::symlink(t.begin(), f.begin()) == -1) 283 return std::error_code(errno, std::generic_category()); 284 285 return std::error_code(); 286} 287 288std::error_code remove(const Twine &path, bool IgnoreNonExisting) { 289 SmallString<128> path_storage; 290 StringRef p = path.toNullTerminatedStringRef(path_storage); 291 292 struct stat buf; 293 if (lstat(p.begin(), &buf) != 0) { 294 if (errno != ENOENT || !IgnoreNonExisting) 295 return std::error_code(errno, std::generic_category()); 296 return std::error_code(); 297 } 298 299 // Note: this check catches strange situations. In all cases, LLVM should 300 // only be involved in the creation and deletion of regular files. This 301 // check ensures that what we're trying to erase is a regular file. It 302 // effectively prevents LLVM from erasing things like /dev/null, any block 303 // special file, or other things that aren't "regular" files. 304 if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode)) 305 return make_error_code(errc::operation_not_permitted); 306 307 if (::remove(p.begin()) == -1) { 308 if (errno != ENOENT || !IgnoreNonExisting) 309 return std::error_code(errno, std::generic_category()); 310 } 311 312 return std::error_code(); 313} 314 315std::error_code rename(const Twine &from, const Twine &to) { 316 // Get arguments. 317 SmallString<128> from_storage; 318 SmallString<128> to_storage; 319 StringRef f = from.toNullTerminatedStringRef(from_storage); 320 StringRef t = to.toNullTerminatedStringRef(to_storage); 321 322 if (::rename(f.begin(), t.begin()) == -1) 323 return std::error_code(errno, std::generic_category()); 324 325 return std::error_code(); 326} 327 328std::error_code resize_file(int FD, uint64_t Size) { 329#if defined(HAVE_POSIX_FALLOCATE) 330 // If we have posix_fallocate use it. Unlike ftruncate it always allocates 331 // space, so we get an error if the disk is full. 332 if (int Err = ::posix_fallocate(FD, 0, Size)) 333 return std::error_code(Err, std::generic_category()); 334#else 335 // Use ftruncate as a fallback. It may or may not allocate space. At least on 336 // OS X with HFS+ it does. 337 if (::ftruncate(FD, Size) == -1) 338 return std::error_code(errno, std::generic_category()); 339#endif 340 341 return std::error_code(); 342} 343 344static int convertAccessMode(AccessMode Mode) { 345 switch (Mode) { 346 case AccessMode::Exist: 347 return F_OK; 348 case AccessMode::Write: 349 return W_OK; 350 case AccessMode::Execute: 351 return R_OK | X_OK; // scripts also need R_OK. 352 } 353 llvm_unreachable("invalid enum"); 354} 355 356std::error_code access(const Twine &Path, AccessMode Mode) { 357 SmallString<128> PathStorage; 358 StringRef P = Path.toNullTerminatedStringRef(PathStorage); 359 360 if (::access(P.begin(), convertAccessMode(Mode)) == -1) 361 return std::error_code(errno, std::generic_category()); 362 363 if (Mode == AccessMode::Execute) { 364 // Don't say that directories are executable. 365 struct stat buf; 366 if (0 != stat(P.begin(), &buf)) 367 return errc::permission_denied; 368 if (!S_ISREG(buf.st_mode)) 369 return errc::permission_denied; 370 } 371 372 return std::error_code(); 373} 374 375bool can_execute(const Twine &Path) { 376 return !access(Path, AccessMode::Execute); 377} 378 379bool equivalent(file_status A, file_status B) { 380 assert(status_known(A) && status_known(B)); 381 return A.fs_st_dev == B.fs_st_dev && 382 A.fs_st_ino == B.fs_st_ino; 383} 384 385std::error_code equivalent(const Twine &A, const Twine &B, bool &result) { 386 file_status fsA, fsB; 387 if (std::error_code ec = status(A, fsA)) 388 return ec; 389 if (std::error_code ec = status(B, fsB)) 390 return ec; 391 result = equivalent(fsA, fsB); 392 return std::error_code(); 393} 394 395static std::error_code fillStatus(int StatRet, const struct stat &Status, 396 file_status &Result) { 397 if (StatRet != 0) { 398 std::error_code ec(errno, std::generic_category()); 399 if (ec == errc::no_such_file_or_directory) 400 Result = file_status(file_type::file_not_found); 401 else 402 Result = file_status(file_type::status_error); 403 return ec; 404 } 405 406 file_type Type = file_type::type_unknown; 407 408 if (S_ISDIR(Status.st_mode)) 409 Type = file_type::directory_file; 410 else if (S_ISREG(Status.st_mode)) 411 Type = file_type::regular_file; 412 else if (S_ISBLK(Status.st_mode)) 413 Type = file_type::block_file; 414 else if (S_ISCHR(Status.st_mode)) 415 Type = file_type::character_file; 416 else if (S_ISFIFO(Status.st_mode)) 417 Type = file_type::fifo_file; 418 else if (S_ISSOCK(Status.st_mode)) 419 Type = file_type::socket_file; 420 421 perms Perms = static_cast<perms>(Status.st_mode); 422 Result = 423 file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_atime, 424 Status.st_mtime, Status.st_uid, Status.st_gid, 425 Status.st_size); 426 427 return std::error_code(); 428} 429 430std::error_code status(const Twine &Path, file_status &Result) { 431 SmallString<128> PathStorage; 432 StringRef P = Path.toNullTerminatedStringRef(PathStorage); 433 434 struct stat Status; 435 int StatRet = ::stat(P.begin(), &Status); 436 return fillStatus(StatRet, Status, Result); 437} 438 439std::error_code status(int FD, file_status &Result) { 440 struct stat Status; 441 int StatRet = ::fstat(FD, &Status); 442 return fillStatus(StatRet, Status, Result); 443} 444 445std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) { 446#if defined(HAVE_FUTIMENS) 447 timespec Times[2]; 448 Times[0] = Times[1] = sys::toTimeSpec(Time); 449 if (::futimens(FD, Times)) 450 return std::error_code(errno, std::generic_category()); 451 return std::error_code(); 452#elif defined(HAVE_FUTIMES) 453 timeval Times[2]; 454 Times[0] = Times[1] = sys::toTimeVal( 455 std::chrono::time_point_cast<std::chrono::microseconds>(Time)); 456 if (::futimes(FD, Times)) 457 return std::error_code(errno, std::generic_category()); 458 return std::error_code(); 459#else 460#warning Missing futimes() and futimens() 461 return make_error_code(errc::function_not_supported); 462#endif 463} 464 465std::error_code mapped_file_region::init(int FD, uint64_t Offset, 466 mapmode Mode) { 467 assert(Size != 0); 468 469 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE; 470 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE); 471 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset); 472 if (Mapping == MAP_FAILED) 473 return std::error_code(errno, std::generic_category()); 474 return std::error_code(); 475} 476 477mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length, 478 uint64_t offset, std::error_code &ec) 479 : Size(length), Mapping() { 480 // Make sure that the requested size fits within SIZE_T. 481 if (length > std::numeric_limits<size_t>::max()) { 482 ec = make_error_code(errc::invalid_argument); 483 return; 484 } 485 486 ec = init(fd, offset, mode); 487 if (ec) 488 Mapping = nullptr; 489} 490 491mapped_file_region::~mapped_file_region() { 492 if (Mapping) 493 ::munmap(Mapping, Size); 494} 495 496uint64_t mapped_file_region::size() const { 497 assert(Mapping && "Mapping failed but used anyway!"); 498 return Size; 499} 500 501char *mapped_file_region::data() const { 502 assert(Mapping && "Mapping failed but used anyway!"); 503 return reinterpret_cast<char*>(Mapping); 504} 505 506const char *mapped_file_region::const_data() const { 507 assert(Mapping && "Mapping failed but used anyway!"); 508 return reinterpret_cast<const char*>(Mapping); 509} 510 511int mapped_file_region::alignment() { 512 return Process::getPageSize(); 513} 514 515std::error_code detail::directory_iterator_construct(detail::DirIterState &it, 516 StringRef path){ 517 SmallString<128> path_null(path); 518 DIR *directory = ::opendir(path_null.c_str()); 519 if (!directory) 520 return std::error_code(errno, std::generic_category()); 521 522 it.IterationHandle = reinterpret_cast<intptr_t>(directory); 523 // Add something for replace_filename to replace. 524 path::append(path_null, "."); 525 it.CurrentEntry = directory_entry(path_null.str()); 526 return directory_iterator_increment(it); 527} 528 529std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) { 530 if (it.IterationHandle) 531 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle)); 532 it.IterationHandle = 0; 533 it.CurrentEntry = directory_entry(); 534 return std::error_code(); 535} 536 537std::error_code detail::directory_iterator_increment(detail::DirIterState &it) { 538 errno = 0; 539 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle)); 540 if (cur_dir == nullptr && errno != 0) { 541 return std::error_code(errno, std::generic_category()); 542 } else if (cur_dir != nullptr) { 543 StringRef name(cur_dir->d_name, NAMLEN(cur_dir)); 544 if ((name.size() == 1 && name[0] == '.') || 545 (name.size() == 2 && name[0] == '.' && name[1] == '.')) 546 return directory_iterator_increment(it); 547 it.CurrentEntry.replace_filename(name); 548 } else 549 return directory_iterator_destruct(it); 550 551 return std::error_code(); 552} 553 554#if !defined(F_GETPATH) 555static bool hasProcSelfFD() { 556 // If we have a /proc filesystem mounted, we can quickly establish the 557 // real name of the file with readlink 558 static const bool Result = (::access("/proc/self/fd", R_OK) == 0); 559 return Result; 560} 561#endif 562 563std::error_code openFileForRead(const Twine &Name, int &ResultFD, 564 SmallVectorImpl<char> *RealPath) { 565 SmallString<128> Storage; 566 StringRef P = Name.toNullTerminatedStringRef(Storage); 567 while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) { 568 if (errno != EINTR) 569 return std::error_code(errno, std::generic_category()); 570 } 571 // Attempt to get the real name of the file, if the user asked 572 if(!RealPath) 573 return std::error_code(); 574 RealPath->clear(); 575#if defined(F_GETPATH) 576 // When F_GETPATH is availble, it is the quickest way to get 577 // the real path name. 578 char Buffer[MAXPATHLEN]; 579 if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1) 580 RealPath->append(Buffer, Buffer + strlen(Buffer)); 581#else 582 char Buffer[PATH_MAX]; 583 if (hasProcSelfFD()) { 584 char ProcPath[64]; 585 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD); 586 ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer)); 587 if (CharCount > 0) 588 RealPath->append(Buffer, Buffer + CharCount); 589 } else { 590 // Use ::realpath to get the real path name 591 if (::realpath(P.begin(), Buffer) != nullptr) 592 RealPath->append(Buffer, Buffer + strlen(Buffer)); 593 } 594#endif 595 return std::error_code(); 596} 597 598std::error_code openFileForWrite(const Twine &Name, int &ResultFD, 599 sys::fs::OpenFlags Flags, unsigned Mode) { 600 // Verify that we don't have both "append" and "excl". 601 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) && 602 "Cannot specify both 'excl' and 'append' file creation flags!"); 603 604 int OpenFlags = O_CREAT; 605 606 if (Flags & F_RW) 607 OpenFlags |= O_RDWR; 608 else 609 OpenFlags |= O_WRONLY; 610 611 if (Flags & F_Append) 612 OpenFlags |= O_APPEND; 613 else 614 OpenFlags |= O_TRUNC; 615 616 if (Flags & F_Excl) 617 OpenFlags |= O_EXCL; 618 619 SmallString<128> Storage; 620 StringRef P = Name.toNullTerminatedStringRef(Storage); 621 while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) { 622 if (errno != EINTR) 623 return std::error_code(errno, std::generic_category()); 624 } 625 return std::error_code(); 626} 627 628std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) { 629 if (FD < 0) 630 return make_error_code(errc::bad_file_descriptor); 631 632#if defined(F_GETPATH) 633 // When F_GETPATH is availble, it is the quickest way to get 634 // the path from a file descriptor. 635 ResultPath.reserve(MAXPATHLEN); 636 if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1) 637 return std::error_code(errno, std::generic_category()); 638 639 ResultPath.set_size(strlen(ResultPath.begin())); 640#else 641 // If we have a /proc filesystem mounted, we can quickly establish the 642 // real name of the file with readlink. Otherwise, we don't know how to 643 // get the filename from a file descriptor. Give up. 644 if (!fs::hasProcSelfFD()) 645 return make_error_code(errc::function_not_supported); 646 647 ResultPath.reserve(PATH_MAX); 648 char ProcPath[64]; 649 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD); 650 ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity()); 651 if (CharCount < 0) 652 return std::error_code(errno, std::generic_category()); 653 654 // Was the filename truncated? 655 if (static_cast<size_t>(CharCount) == ResultPath.capacity()) { 656 // Use lstat to get the size of the filename 657 struct stat sb; 658 if (::lstat(ProcPath, &sb) < 0) 659 return std::error_code(errno, std::generic_category()); 660 661 ResultPath.reserve(sb.st_size + 1); 662 CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity()); 663 if (CharCount < 0) 664 return std::error_code(errno, std::generic_category()); 665 666 // Test for race condition: did the link size change? 667 if (CharCount > sb.st_size) 668 return std::error_code(ENAMETOOLONG, std::generic_category()); 669 } 670 ResultPath.set_size(static_cast<size_t>(CharCount)); 671#endif 672 return std::error_code(); 673} 674 675} // end namespace fs 676 677namespace path { 678 679bool home_directory(SmallVectorImpl<char> &result) { 680 if (char *RequestedDir = getenv("HOME")) { 681 result.clear(); 682 result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 683 return true; 684 } 685 686 return false; 687} 688 689static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) { 690 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR) 691 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR. 692 // macros defined in <unistd.h> on darwin >= 9 693 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR 694 : _CS_DARWIN_USER_CACHE_DIR; 695 size_t ConfLen = confstr(ConfName, nullptr, 0); 696 if (ConfLen > 0) { 697 do { 698 Result.resize(ConfLen); 699 ConfLen = confstr(ConfName, Result.data(), Result.size()); 700 } while (ConfLen > 0 && ConfLen != Result.size()); 701 702 if (ConfLen > 0) { 703 assert(Result.back() == 0); 704 Result.pop_back(); 705 return true; 706 } 707 708 Result.clear(); 709 } 710 #endif 711 return false; 712} 713 714static bool getUserCacheDir(SmallVectorImpl<char> &Result) { 715 // First try using XDG_CACHE_HOME env variable, 716 // as specified in XDG Base Directory Specification at 717 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html 718 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) { 719 Result.clear(); 720 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir)); 721 return true; 722 } 723 724 // Try Darwin configuration query 725 if (getDarwinConfDir(false, Result)) 726 return true; 727 728 // Use "$HOME/.cache" if $HOME is available 729 if (home_directory(Result)) { 730 append(Result, ".cache"); 731 return true; 732 } 733 734 return false; 735} 736 737static const char *getEnvTempDir() { 738 // Check whether the temporary directory is specified by an environment 739 // variable. 740 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"}; 741 for (const char *Env : EnvironmentVariables) { 742 if (const char *Dir = std::getenv(Env)) 743 return Dir; 744 } 745 746 return nullptr; 747} 748 749static const char *getDefaultTempDir(bool ErasedOnReboot) { 750#ifdef P_tmpdir 751 if ((bool)P_tmpdir) 752 return P_tmpdir; 753#endif 754 755 if (ErasedOnReboot) 756 return "/tmp"; 757 return "/var/tmp"; 758} 759 760void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) { 761 Result.clear(); 762 763 if (ErasedOnReboot) { 764 // There is no env variable for the cache directory. 765 if (const char *RequestedDir = getEnvTempDir()) { 766 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 767 return; 768 } 769 } 770 771 if (getDarwinConfDir(ErasedOnReboot, Result)) 772 return; 773 774 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot); 775 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 776} 777 778} // end namespace path 779 780} // end namespace sys 781} // end namespace llvm 782