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__) || \ 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 201TimeValue file_status::getLastAccessedTime() const { 202 TimeValue Ret; 203 Ret.fromEpochTime(fs_st_atime); 204 return Ret; 205} 206 207TimeValue file_status::getLastModificationTime() const { 208 TimeValue Ret; 209 Ret.fromEpochTime(fs_st_mtime); 210 return Ret; 211} 212 213UniqueID file_status::getUniqueID() const { 214 return UniqueID(fs_st_dev, fs_st_ino); 215} 216 217ErrorOr<space_info> disk_space(const Twine &Path) { 218 struct STATVFS Vfs; 219 if (::STATVFS(Path.str().c_str(), &Vfs)) 220 return std::error_code(errno, std::generic_category()); 221 auto FrSize = STATVFS_F_FRSIZE(Vfs); 222 space_info SpaceInfo; 223 SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize; 224 SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize; 225 SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize; 226 return SpaceInfo; 227} 228 229std::error_code current_path(SmallVectorImpl<char> &result) { 230 result.clear(); 231 232 const char *pwd = ::getenv("PWD"); 233 llvm::sys::fs::file_status PWDStatus, DotStatus; 234 if (pwd && llvm::sys::path::is_absolute(pwd) && 235 !llvm::sys::fs::status(pwd, PWDStatus) && 236 !llvm::sys::fs::status(".", DotStatus) && 237 PWDStatus.getUniqueID() == DotStatus.getUniqueID()) { 238 result.append(pwd, pwd + strlen(pwd)); 239 return std::error_code(); 240 } 241 242#ifdef MAXPATHLEN 243 result.reserve(MAXPATHLEN); 244#else 245// For GNU Hurd 246 result.reserve(1024); 247#endif 248 249 while (true) { 250 if (::getcwd(result.data(), result.capacity()) == nullptr) { 251 // See if there was a real error. 252 if (errno != ENOMEM) 253 return std::error_code(errno, std::generic_category()); 254 // Otherwise there just wasn't enough space. 255 result.reserve(result.capacity() * 2); 256 } else 257 break; 258 } 259 260 result.set_size(strlen(result.data())); 261 return std::error_code(); 262} 263 264std::error_code create_directory(const Twine &path, bool IgnoreExisting, 265 perms Perms) { 266 SmallString<128> path_storage; 267 StringRef p = path.toNullTerminatedStringRef(path_storage); 268 269 if (::mkdir(p.begin(), Perms) == -1) { 270 if (errno != EEXIST || !IgnoreExisting) 271 return std::error_code(errno, std::generic_category()); 272 } 273 274 return std::error_code(); 275} 276 277// Note that we are using symbolic link because hard links are not supported by 278// all filesystems (SMB doesn't). 279std::error_code create_link(const Twine &to, const Twine &from) { 280 // Get arguments. 281 SmallString<128> from_storage; 282 SmallString<128> to_storage; 283 StringRef f = from.toNullTerminatedStringRef(from_storage); 284 StringRef t = to.toNullTerminatedStringRef(to_storage); 285 286 if (::symlink(t.begin(), f.begin()) == -1) 287 return std::error_code(errno, std::generic_category()); 288 289 return std::error_code(); 290} 291 292std::error_code remove(const Twine &path, bool IgnoreNonExisting) { 293 SmallString<128> path_storage; 294 StringRef p = path.toNullTerminatedStringRef(path_storage); 295 296 struct stat buf; 297 if (lstat(p.begin(), &buf) != 0) { 298 if (errno != ENOENT || !IgnoreNonExisting) 299 return std::error_code(errno, std::generic_category()); 300 return std::error_code(); 301 } 302 303 // Note: this check catches strange situations. In all cases, LLVM should 304 // only be involved in the creation and deletion of regular files. This 305 // check ensures that what we're trying to erase is a regular file. It 306 // effectively prevents LLVM from erasing things like /dev/null, any block 307 // special file, or other things that aren't "regular" files. 308 if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode)) 309 return make_error_code(errc::operation_not_permitted); 310 311 if (::remove(p.begin()) == -1) { 312 if (errno != ENOENT || !IgnoreNonExisting) 313 return std::error_code(errno, std::generic_category()); 314 } 315 316 return std::error_code(); 317} 318 319std::error_code rename(const Twine &from, const Twine &to) { 320 // Get arguments. 321 SmallString<128> from_storage; 322 SmallString<128> to_storage; 323 StringRef f = from.toNullTerminatedStringRef(from_storage); 324 StringRef t = to.toNullTerminatedStringRef(to_storage); 325 326 if (::rename(f.begin(), t.begin()) == -1) 327 return std::error_code(errno, std::generic_category()); 328 329 return std::error_code(); 330} 331 332std::error_code resize_file(int FD, uint64_t Size) { 333#if defined(HAVE_POSIX_FALLOCATE) 334 // If we have posix_fallocate use it. Unlike ftruncate it always allocates 335 // space, so we get an error if the disk is full. 336 if (int Err = ::posix_fallocate(FD, 0, Size)) 337 return std::error_code(Err, std::generic_category()); 338#else 339 // Use ftruncate as a fallback. It may or may not allocate space. At least on 340 // OS X with HFS+ it does. 341 if (::ftruncate(FD, Size) == -1) 342 return std::error_code(errno, std::generic_category()); 343#endif 344 345 return std::error_code(); 346} 347 348static int convertAccessMode(AccessMode Mode) { 349 switch (Mode) { 350 case AccessMode::Exist: 351 return F_OK; 352 case AccessMode::Write: 353 return W_OK; 354 case AccessMode::Execute: 355 return R_OK | X_OK; // scripts also need R_OK. 356 } 357 llvm_unreachable("invalid enum"); 358} 359 360std::error_code access(const Twine &Path, AccessMode Mode) { 361 SmallString<128> PathStorage; 362 StringRef P = Path.toNullTerminatedStringRef(PathStorage); 363 364 if (::access(P.begin(), convertAccessMode(Mode)) == -1) 365 return std::error_code(errno, std::generic_category()); 366 367 if (Mode == AccessMode::Execute) { 368 // Don't say that directories are executable. 369 struct stat buf; 370 if (0 != stat(P.begin(), &buf)) 371 return errc::permission_denied; 372 if (!S_ISREG(buf.st_mode)) 373 return errc::permission_denied; 374 } 375 376 return std::error_code(); 377} 378 379bool can_execute(const Twine &Path) { 380 return !access(Path, AccessMode::Execute); 381} 382 383bool equivalent(file_status A, file_status B) { 384 assert(status_known(A) && status_known(B)); 385 return A.fs_st_dev == B.fs_st_dev && 386 A.fs_st_ino == B.fs_st_ino; 387} 388 389std::error_code equivalent(const Twine &A, const Twine &B, bool &result) { 390 file_status fsA, fsB; 391 if (std::error_code ec = status(A, fsA)) 392 return ec; 393 if (std::error_code ec = status(B, fsB)) 394 return ec; 395 result = equivalent(fsA, fsB); 396 return std::error_code(); 397} 398 399static std::error_code fillStatus(int StatRet, const struct stat &Status, 400 file_status &Result) { 401 if (StatRet != 0) { 402 std::error_code ec(errno, std::generic_category()); 403 if (ec == errc::no_such_file_or_directory) 404 Result = file_status(file_type::file_not_found); 405 else 406 Result = file_status(file_type::status_error); 407 return ec; 408 } 409 410 file_type Type = file_type::type_unknown; 411 412 if (S_ISDIR(Status.st_mode)) 413 Type = file_type::directory_file; 414 else if (S_ISREG(Status.st_mode)) 415 Type = file_type::regular_file; 416 else if (S_ISBLK(Status.st_mode)) 417 Type = file_type::block_file; 418 else if (S_ISCHR(Status.st_mode)) 419 Type = file_type::character_file; 420 else if (S_ISFIFO(Status.st_mode)) 421 Type = file_type::fifo_file; 422 else if (S_ISSOCK(Status.st_mode)) 423 Type = file_type::socket_file; 424 425 perms Perms = static_cast<perms>(Status.st_mode); 426 Result = 427 file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_atime, 428 Status.st_mtime, Status.st_uid, Status.st_gid, 429 Status.st_size); 430 431 return std::error_code(); 432} 433 434std::error_code status(const Twine &Path, file_status &Result) { 435 SmallString<128> PathStorage; 436 StringRef P = Path.toNullTerminatedStringRef(PathStorage); 437 438 struct stat Status; 439 int StatRet = ::stat(P.begin(), &Status); 440 return fillStatus(StatRet, Status, Result); 441} 442 443std::error_code status(int FD, file_status &Result) { 444 struct stat Status; 445 int StatRet = ::fstat(FD, &Status); 446 return fillStatus(StatRet, Status, Result); 447} 448 449std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) { 450#if defined(HAVE_FUTIMENS) 451 timespec Times[2]; 452 Times[0].tv_sec = Time.toEpochTime(); 453 Times[0].tv_nsec = 0; 454 Times[1] = Times[0]; 455 if (::futimens(FD, Times)) 456 return std::error_code(errno, std::generic_category()); 457 return std::error_code(); 458#elif defined(HAVE_FUTIMES) 459 timeval Times[2]; 460 Times[0].tv_sec = Time.toEpochTime(); 461 Times[0].tv_usec = 0; 462 Times[1] = Times[0]; 463 if (::futimes(FD, Times)) 464 return std::error_code(errno, std::generic_category()); 465 return std::error_code(); 466#else 467#warning Missing futimes() and futimens() 468 return make_error_code(errc::function_not_supported); 469#endif 470} 471 472std::error_code mapped_file_region::init(int FD, uint64_t Offset, 473 mapmode Mode) { 474 assert(Size != 0); 475 476 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE; 477 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE); 478 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset); 479 if (Mapping == MAP_FAILED) 480 return std::error_code(errno, std::generic_category()); 481 return std::error_code(); 482} 483 484mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length, 485 uint64_t offset, std::error_code &ec) 486 : Size(length), Mapping() { 487 // Make sure that the requested size fits within SIZE_T. 488 if (length > std::numeric_limits<size_t>::max()) { 489 ec = make_error_code(errc::invalid_argument); 490 return; 491 } 492 493 ec = init(fd, offset, mode); 494 if (ec) 495 Mapping = nullptr; 496} 497 498mapped_file_region::~mapped_file_region() { 499 if (Mapping) 500 ::munmap(Mapping, Size); 501} 502 503uint64_t mapped_file_region::size() const { 504 assert(Mapping && "Mapping failed but used anyway!"); 505 return Size; 506} 507 508char *mapped_file_region::data() const { 509 assert(Mapping && "Mapping failed but used anyway!"); 510 return reinterpret_cast<char*>(Mapping); 511} 512 513const char *mapped_file_region::const_data() const { 514 assert(Mapping && "Mapping failed but used anyway!"); 515 return reinterpret_cast<const char*>(Mapping); 516} 517 518int mapped_file_region::alignment() { 519 return Process::getPageSize(); 520} 521 522std::error_code detail::directory_iterator_construct(detail::DirIterState &it, 523 StringRef path){ 524 SmallString<128> path_null(path); 525 DIR *directory = ::opendir(path_null.c_str()); 526 if (!directory) 527 return std::error_code(errno, std::generic_category()); 528 529 it.IterationHandle = reinterpret_cast<intptr_t>(directory); 530 // Add something for replace_filename to replace. 531 path::append(path_null, "."); 532 it.CurrentEntry = directory_entry(path_null.str()); 533 return directory_iterator_increment(it); 534} 535 536std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) { 537 if (it.IterationHandle) 538 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle)); 539 it.IterationHandle = 0; 540 it.CurrentEntry = directory_entry(); 541 return std::error_code(); 542} 543 544std::error_code detail::directory_iterator_increment(detail::DirIterState &it) { 545 errno = 0; 546 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle)); 547 if (cur_dir == nullptr && errno != 0) { 548 return std::error_code(errno, std::generic_category()); 549 } else if (cur_dir != nullptr) { 550 StringRef name(cur_dir->d_name, NAMLEN(cur_dir)); 551 if ((name.size() == 1 && name[0] == '.') || 552 (name.size() == 2 && name[0] == '.' && name[1] == '.')) 553 return directory_iterator_increment(it); 554 it.CurrentEntry.replace_filename(name); 555 } else 556 return directory_iterator_destruct(it); 557 558 return std::error_code(); 559} 560 561#if !defined(F_GETPATH) 562static bool hasProcSelfFD() { 563 // If we have a /proc filesystem mounted, we can quickly establish the 564 // real name of the file with readlink 565 static const bool Result = (::access("/proc/self/fd", R_OK) == 0); 566 return Result; 567} 568#endif 569 570std::error_code openFileForRead(const Twine &Name, int &ResultFD, 571 SmallVectorImpl<char> *RealPath) { 572 SmallString<128> Storage; 573 StringRef P = Name.toNullTerminatedStringRef(Storage); 574 while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) { 575 if (errno != EINTR) 576 return std::error_code(errno, std::generic_category()); 577 } 578 // Attempt to get the real name of the file, if the user asked 579 if(!RealPath) 580 return std::error_code(); 581 RealPath->clear(); 582#if defined(F_GETPATH) 583 // When F_GETPATH is availble, it is the quickest way to get 584 // the real path name. 585 char Buffer[MAXPATHLEN]; 586 if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1) 587 RealPath->append(Buffer, Buffer + strlen(Buffer)); 588#else 589 char Buffer[PATH_MAX]; 590 if (hasProcSelfFD()) { 591 char ProcPath[64]; 592 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD); 593 ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer)); 594 if (CharCount > 0) 595 RealPath->append(Buffer, Buffer + CharCount); 596 } else { 597 // Use ::realpath to get the real path name 598 if (::realpath(P.begin(), Buffer) != nullptr) 599 RealPath->append(Buffer, Buffer + strlen(Buffer)); 600 } 601#endif 602 return std::error_code(); 603} 604 605std::error_code openFileForWrite(const Twine &Name, int &ResultFD, 606 sys::fs::OpenFlags Flags, unsigned Mode) { 607 // Verify that we don't have both "append" and "excl". 608 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) && 609 "Cannot specify both 'excl' and 'append' file creation flags!"); 610 611 int OpenFlags = O_CREAT; 612 613 if (Flags & F_RW) 614 OpenFlags |= O_RDWR; 615 else 616 OpenFlags |= O_WRONLY; 617 618 if (Flags & F_Append) 619 OpenFlags |= O_APPEND; 620 else 621 OpenFlags |= O_TRUNC; 622 623 if (Flags & F_Excl) 624 OpenFlags |= O_EXCL; 625 626 SmallString<128> Storage; 627 StringRef P = Name.toNullTerminatedStringRef(Storage); 628 while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) { 629 if (errno != EINTR) 630 return std::error_code(errno, std::generic_category()); 631 } 632 return std::error_code(); 633} 634 635std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) { 636 if (FD < 0) 637 return make_error_code(errc::bad_file_descriptor); 638 639#if defined(F_GETPATH) 640 // When F_GETPATH is availble, it is the quickest way to get 641 // the path from a file descriptor. 642 ResultPath.reserve(MAXPATHLEN); 643 if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1) 644 return std::error_code(errno, std::generic_category()); 645 646 ResultPath.set_size(strlen(ResultPath.begin())); 647#else 648 // If we have a /proc filesystem mounted, we can quickly establish the 649 // real name of the file with readlink. Otherwise, we don't know how to 650 // get the filename from a file descriptor. Give up. 651 if (!fs::hasProcSelfFD()) 652 return make_error_code(errc::function_not_supported); 653 654 ResultPath.reserve(PATH_MAX); 655 char ProcPath[64]; 656 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD); 657 ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity()); 658 if (CharCount < 0) 659 return std::error_code(errno, std::generic_category()); 660 661 // Was the filename truncated? 662 if (static_cast<size_t>(CharCount) == ResultPath.capacity()) { 663 // Use lstat to get the size of the filename 664 struct stat sb; 665 if (::lstat(ProcPath, &sb) < 0) 666 return std::error_code(errno, std::generic_category()); 667 668 ResultPath.reserve(sb.st_size + 1); 669 CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity()); 670 if (CharCount < 0) 671 return std::error_code(errno, std::generic_category()); 672 673 // Test for race condition: did the link size change? 674 if (CharCount > sb.st_size) 675 return std::error_code(ENAMETOOLONG, std::generic_category()); 676 } 677 ResultPath.set_size(static_cast<size_t>(CharCount)); 678#endif 679 return std::error_code(); 680} 681 682} // end namespace fs 683 684namespace path { 685 686bool home_directory(SmallVectorImpl<char> &result) { 687 if (char *RequestedDir = getenv("HOME")) { 688 result.clear(); 689 result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 690 return true; 691 } 692 693 return false; 694} 695 696static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) { 697 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR) 698 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR. 699 // macros defined in <unistd.h> on darwin >= 9 700 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR 701 : _CS_DARWIN_USER_CACHE_DIR; 702 size_t ConfLen = confstr(ConfName, nullptr, 0); 703 if (ConfLen > 0) { 704 do { 705 Result.resize(ConfLen); 706 ConfLen = confstr(ConfName, Result.data(), Result.size()); 707 } while (ConfLen > 0 && ConfLen != Result.size()); 708 709 if (ConfLen > 0) { 710 assert(Result.back() == 0); 711 Result.pop_back(); 712 return true; 713 } 714 715 Result.clear(); 716 } 717 #endif 718 return false; 719} 720 721static bool getUserCacheDir(SmallVectorImpl<char> &Result) { 722 // First try using XDG_CACHE_HOME env variable, 723 // as specified in XDG Base Directory Specification at 724 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html 725 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) { 726 Result.clear(); 727 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir)); 728 return true; 729 } 730 731 // Try Darwin configuration query 732 if (getDarwinConfDir(false, Result)) 733 return true; 734 735 // Use "$HOME/.cache" if $HOME is available 736 if (home_directory(Result)) { 737 append(Result, ".cache"); 738 return true; 739 } 740 741 return false; 742} 743 744static const char *getEnvTempDir() { 745 // Check whether the temporary directory is specified by an environment 746 // variable. 747 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"}; 748 for (const char *Env : EnvironmentVariables) { 749 if (const char *Dir = std::getenv(Env)) 750 return Dir; 751 } 752 753 return nullptr; 754} 755 756static const char *getDefaultTempDir(bool ErasedOnReboot) { 757#ifdef P_tmpdir 758 if ((bool)P_tmpdir) 759 return P_tmpdir; 760#endif 761 762 if (ErasedOnReboot) 763 return "/tmp"; 764 return "/var/tmp"; 765} 766 767void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) { 768 Result.clear(); 769 770 if (ErasedOnReboot) { 771 // There is no env variable for the cache directory. 772 if (const char *RequestedDir = getEnvTempDir()) { 773 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 774 return; 775 } 776 } 777 778 if (getDarwinConfDir(ErasedOnReboot, Result)) 779 return; 780 781 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot); 782 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 783} 784 785} // end namespace path 786 787} // end namespace sys 788} // end namespace llvm 789