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