forked from OSchip/llvm-project
984 lines
28 KiB
C++
984 lines
28 KiB
C++
//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Unix specific implementation of the Path API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include <limits.h>
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#include <stdio.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#if HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# if HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# if HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# if HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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#include <pwd.h>
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#ifdef __APPLE__
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#include <mach-o/dyld.h>
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#include <sys/attr.h>
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#endif
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// Both stdio.h and cstdio are included via different paths and
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// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
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// either.
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#undef ferror
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#undef feof
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// For GNU Hurd
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#if defined(__GNU__) && !defined(PATH_MAX)
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# define PATH_MAX 4096
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#endif
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#include <sys/types.h>
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#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && \
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!defined(__linux__)
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#include <sys/statvfs.h>
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#define STATVFS statvfs
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#define FSTATVFS fstatvfs
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#define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
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#else
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#if defined(__OpenBSD__) || defined(__FreeBSD__)
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#include <sys/mount.h>
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#include <sys/param.h>
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#elif defined(__linux__)
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#if defined(HAVE_LINUX_MAGIC_H)
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#include <linux/magic.h>
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#else
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#if defined(HAVE_LINUX_NFS_FS_H)
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#include <linux/nfs_fs.h>
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#endif
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#if defined(HAVE_LINUX_SMB_H)
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#include <linux/smb.h>
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#endif
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#endif
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#include <sys/vfs.h>
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#else
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#include <sys/mount.h>
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#endif
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#define STATVFS statfs
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#define FSTATVFS fstatfs
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#define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
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#endif
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#if defined(__NetBSD__)
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#define STATVFS_F_FLAG(vfs) (vfs).f_flag
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#else
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#define STATVFS_F_FLAG(vfs) (vfs).f_flags
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#endif
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using namespace llvm;
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namespace llvm {
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namespace sys {
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namespace fs {
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
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defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) || \
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defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX)
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static int
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test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
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{
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struct stat sb;
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char fullpath[PATH_MAX];
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snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
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if (!realpath(fullpath, ret))
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return 1;
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if (stat(fullpath, &sb) != 0)
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return 1;
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return 0;
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}
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static char *
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getprogpath(char ret[PATH_MAX], const char *bin)
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{
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char *pv, *s, *t;
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/* First approach: absolute path. */
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if (bin[0] == '/') {
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if (test_dir(ret, "/", bin) == 0)
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return ret;
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return nullptr;
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}
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/* Second approach: relative path. */
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if (strchr(bin, '/')) {
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char cwd[PATH_MAX];
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if (!getcwd(cwd, PATH_MAX))
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return nullptr;
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if (test_dir(ret, cwd, bin) == 0)
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return ret;
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return nullptr;
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}
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/* Third approach: $PATH */
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if ((pv = getenv("PATH")) == nullptr)
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return nullptr;
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s = pv = strdup(pv);
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if (!pv)
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return nullptr;
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while ((t = strsep(&s, ":")) != nullptr) {
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if (test_dir(ret, t, bin) == 0) {
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free(pv);
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return ret;
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}
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}
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free(pv);
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return nullptr;
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}
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#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
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/// GetMainExecutable - Return the path to the main executable, given the
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/// value of argv[0] from program startup.
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std::string getMainExecutable(const char *argv0, void *MainAddr) {
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#if defined(__APPLE__)
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// On OS X the executable path is saved to the stack by dyld. Reading it
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// from there is much faster than calling dladdr, especially for large
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// binaries with symbols.
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char exe_path[MAXPATHLEN];
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uint32_t size = sizeof(exe_path);
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if (_NSGetExecutablePath(exe_path, &size) == 0) {
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char link_path[MAXPATHLEN];
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if (realpath(exe_path, link_path))
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return link_path;
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}
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#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
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defined(__minix) || defined(__DragonFly__) || \
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defined(__FreeBSD_kernel__) || defined(_AIX)
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char exe_path[PATH_MAX];
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if (getprogpath(exe_path, argv0) != NULL)
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return exe_path;
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#elif defined(__linux__) || defined(__CYGWIN__)
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char exe_path[MAXPATHLEN];
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StringRef aPath("/proc/self/exe");
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if (sys::fs::exists(aPath)) {
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// /proc is not always mounted under Linux (chroot for example).
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ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
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if (len >= 0)
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return std::string(exe_path, len);
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} else {
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// Fall back to the classical detection.
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if (getprogpath(exe_path, argv0))
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return exe_path;
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}
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#elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
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// Use dladdr to get executable path if available.
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Dl_info DLInfo;
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int err = dladdr(MainAddr, &DLInfo);
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if (err == 0)
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return "";
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// If the filename is a symlink, we need to resolve and return the location of
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// the actual executable.
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char link_path[MAXPATHLEN];
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if (realpath(DLInfo.dli_fname, link_path))
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return link_path;
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#else
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#error GetMainExecutable is not implemented on this host yet.
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#endif
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return "";
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}
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TimePoint<> basic_file_status::getLastAccessedTime() const {
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return toTimePoint(fs_st_atime);
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}
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TimePoint<> basic_file_status::getLastModificationTime() const {
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return toTimePoint(fs_st_mtime);
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}
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UniqueID file_status::getUniqueID() const {
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return UniqueID(fs_st_dev, fs_st_ino);
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}
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uint32_t file_status::getLinkCount() const {
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return fs_st_nlinks;
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}
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ErrorOr<space_info> disk_space(const Twine &Path) {
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struct STATVFS Vfs;
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if (::STATVFS(Path.str().c_str(), &Vfs))
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return std::error_code(errno, std::generic_category());
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auto FrSize = STATVFS_F_FRSIZE(Vfs);
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space_info SpaceInfo;
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SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
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SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
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SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
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return SpaceInfo;
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}
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std::error_code current_path(SmallVectorImpl<char> &result) {
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result.clear();
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const char *pwd = ::getenv("PWD");
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llvm::sys::fs::file_status PWDStatus, DotStatus;
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if (pwd && llvm::sys::path::is_absolute(pwd) &&
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!llvm::sys::fs::status(pwd, PWDStatus) &&
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!llvm::sys::fs::status(".", DotStatus) &&
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PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
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result.append(pwd, pwd + strlen(pwd));
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return std::error_code();
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}
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#ifdef MAXPATHLEN
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result.reserve(MAXPATHLEN);
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#else
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// For GNU Hurd
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result.reserve(1024);
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#endif
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while (true) {
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if (::getcwd(result.data(), result.capacity()) == nullptr) {
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// See if there was a real error.
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if (errno != ENOMEM)
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return std::error_code(errno, std::generic_category());
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// Otherwise there just wasn't enough space.
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result.reserve(result.capacity() * 2);
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} else
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break;
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}
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result.set_size(strlen(result.data()));
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return std::error_code();
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}
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std::error_code set_current_path(const Twine &path) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::chdir(p.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code create_directory(const Twine &path, bool IgnoreExisting,
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perms Perms) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::mkdir(p.begin(), Perms) == -1) {
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if (errno != EEXIST || !IgnoreExisting)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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// Note that we are using symbolic link because hard links are not supported by
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// all filesystems (SMB doesn't).
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std::error_code create_link(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::symlink(t.begin(), f.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code create_hard_link(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::link(t.begin(), f.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat buf;
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if (lstat(p.begin(), &buf) != 0) {
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if (errno != ENOENT || !IgnoreNonExisting)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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// Note: this check catches strange situations. In all cases, LLVM should
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// only be involved in the creation and deletion of regular files. This
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// check ensures that what we're trying to erase is a regular file. It
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// effectively prevents LLVM from erasing things like /dev/null, any block
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// special file, or other things that aren't "regular" files.
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if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
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return make_error_code(errc::operation_not_permitted);
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if (::remove(p.begin()) == -1) {
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if (errno != ENOENT || !IgnoreNonExisting)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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static bool is_local_impl(struct STATVFS &Vfs) {
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#if defined(__linux__)
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#ifndef NFS_SUPER_MAGIC
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#define NFS_SUPER_MAGIC 0x6969
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#endif
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#ifndef SMB_SUPER_MAGIC
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#define SMB_SUPER_MAGIC 0x517B
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#endif
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#ifndef CIFS_MAGIC_NUMBER
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#define CIFS_MAGIC_NUMBER 0xFF534D42
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#endif
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switch ((uint32_t)Vfs.f_type) {
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case NFS_SUPER_MAGIC:
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case SMB_SUPER_MAGIC:
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case CIFS_MAGIC_NUMBER:
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return false;
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default:
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return true;
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}
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#elif defined(__CYGWIN__)
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// Cygwin doesn't expose this information; would need to use Win32 API.
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return false;
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#elif defined(__sun)
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// statvfs::f_basetype contains a null-terminated FSType name of the mounted target
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StringRef fstype(Vfs.f_basetype);
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// NFS is the only non-local fstype??
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return !fstype.equals("nfs");
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#else
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return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
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#endif
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}
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std::error_code is_local(const Twine &Path, bool &Result) {
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struct STATVFS Vfs;
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if (::STATVFS(Path.str().c_str(), &Vfs))
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return std::error_code(errno, std::generic_category());
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Result = is_local_impl(Vfs);
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return std::error_code();
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}
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std::error_code is_local(int FD, bool &Result) {
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struct STATVFS Vfs;
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if (::FSTATVFS(FD, &Vfs))
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return std::error_code(errno, std::generic_category());
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Result = is_local_impl(Vfs);
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return std::error_code();
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}
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std::error_code rename(const Twine &from, const Twine &to) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::rename(f.begin(), t.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code resize_file(int FD, uint64_t Size) {
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#if defined(HAVE_POSIX_FALLOCATE)
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// If we have posix_fallocate use it. Unlike ftruncate it always allocates
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// space, so we get an error if the disk is full.
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if (int Err = ::posix_fallocate(FD, 0, Size)) {
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if (Err != EINVAL && Err != EOPNOTSUPP)
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return std::error_code(Err, std::generic_category());
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}
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#endif
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// Use ftruncate as a fallback. It may or may not allocate space. At least on
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// OS X with HFS+ it does.
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if (::ftruncate(FD, Size) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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static int convertAccessMode(AccessMode Mode) {
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switch (Mode) {
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case AccessMode::Exist:
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return F_OK;
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case AccessMode::Write:
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return W_OK;
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case AccessMode::Execute:
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return R_OK | X_OK; // scripts also need R_OK.
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}
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llvm_unreachable("invalid enum");
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}
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std::error_code access(const Twine &Path, AccessMode Mode) {
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SmallString<128> PathStorage;
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StringRef P = Path.toNullTerminatedStringRef(PathStorage);
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if (::access(P.begin(), convertAccessMode(Mode)) == -1)
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return std::error_code(errno, std::generic_category());
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if (Mode == AccessMode::Execute) {
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// Don't say that directories are executable.
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struct stat buf;
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if (0 != stat(P.begin(), &buf))
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return errc::permission_denied;
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if (!S_ISREG(buf.st_mode))
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return errc::permission_denied;
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}
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return std::error_code();
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}
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bool can_execute(const Twine &Path) {
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return !access(Path, AccessMode::Execute);
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}
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bool equivalent(file_status A, file_status B) {
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assert(status_known(A) && status_known(B));
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return A.fs_st_dev == B.fs_st_dev &&
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A.fs_st_ino == B.fs_st_ino;
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}
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std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
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file_status fsA, fsB;
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if (std::error_code ec = status(A, fsA))
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return ec;
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if (std::error_code ec = status(B, fsB))
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return ec;
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result = equivalent(fsA, fsB);
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return std::error_code();
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}
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static void expandTildeExpr(SmallVectorImpl<char> &Path) {
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StringRef PathStr(Path.begin(), Path.size());
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if (PathStr.empty() || !PathStr.startswith("~"))
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return;
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PathStr = PathStr.drop_front();
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StringRef Expr =
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PathStr.take_until([](char c) { return path::is_separator(c); });
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StringRef Remainder = PathStr.substr(Expr.size() + 1);
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SmallString<128> Storage;
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|
if (Expr.empty()) {
|
|
// This is just ~/..., resolve it to the current user's home dir.
|
|
if (!path::home_directory(Storage)) {
|
|
// For some reason we couldn't get the home directory. Just exit.
|
|
return;
|
|
}
|
|
|
|
// Overwrite the first character and insert the rest.
|
|
Path[0] = Storage[0];
|
|
Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
|
|
return;
|
|
}
|
|
|
|
// This is a string of the form ~username/, look up this user's entry in the
|
|
// password database.
|
|
struct passwd *Entry = nullptr;
|
|
std::string User = Expr.str();
|
|
Entry = ::getpwnam(User.c_str());
|
|
|
|
if (!Entry) {
|
|
// Unable to look up the entry, just return back the original path.
|
|
return;
|
|
}
|
|
|
|
Storage = Remainder;
|
|
Path.clear();
|
|
Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
|
|
llvm::sys::path::append(Path, Storage);
|
|
}
|
|
|
|
static std::error_code fillStatus(int StatRet, const struct stat &Status,
|
|
file_status &Result) {
|
|
if (StatRet != 0) {
|
|
std::error_code ec(errno, std::generic_category());
|
|
if (ec == errc::no_such_file_or_directory)
|
|
Result = file_status(file_type::file_not_found);
|
|
else
|
|
Result = file_status(file_type::status_error);
|
|
return ec;
|
|
}
|
|
|
|
file_type Type = file_type::type_unknown;
|
|
|
|
if (S_ISDIR(Status.st_mode))
|
|
Type = file_type::directory_file;
|
|
else if (S_ISREG(Status.st_mode))
|
|
Type = file_type::regular_file;
|
|
else if (S_ISBLK(Status.st_mode))
|
|
Type = file_type::block_file;
|
|
else if (S_ISCHR(Status.st_mode))
|
|
Type = file_type::character_file;
|
|
else if (S_ISFIFO(Status.st_mode))
|
|
Type = file_type::fifo_file;
|
|
else if (S_ISSOCK(Status.st_mode))
|
|
Type = file_type::socket_file;
|
|
else if (S_ISLNK(Status.st_mode))
|
|
Type = file_type::symlink_file;
|
|
|
|
perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
|
|
Result = file_status(Type, Perms, Status.st_dev, Status.st_nlink,
|
|
Status.st_ino, Status.st_atime, Status.st_mtime,
|
|
Status.st_uid, Status.st_gid, Status.st_size);
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
|
|
SmallString<128> PathStorage;
|
|
StringRef P = Path.toNullTerminatedStringRef(PathStorage);
|
|
|
|
struct stat Status;
|
|
int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
|
|
return fillStatus(StatRet, Status, Result);
|
|
}
|
|
|
|
std::error_code status(int FD, file_status &Result) {
|
|
struct stat Status;
|
|
int StatRet = ::fstat(FD, &Status);
|
|
return fillStatus(StatRet, Status, Result);
|
|
}
|
|
|
|
std::error_code setPermissions(const Twine &Path, perms Permissions) {
|
|
SmallString<128> PathStorage;
|
|
StringRef P = Path.toNullTerminatedStringRef(PathStorage);
|
|
|
|
if (::chmod(P.begin(), Permissions))
|
|
return std::error_code(errno, std::generic_category());
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
|
|
#if defined(HAVE_FUTIMENS)
|
|
timespec Times[2];
|
|
Times[0] = Times[1] = sys::toTimeSpec(Time);
|
|
if (::futimens(FD, Times))
|
|
return std::error_code(errno, std::generic_category());
|
|
return std::error_code();
|
|
#elif defined(HAVE_FUTIMES)
|
|
timeval Times[2];
|
|
Times[0] = Times[1] = sys::toTimeVal(
|
|
std::chrono::time_point_cast<std::chrono::microseconds>(Time));
|
|
if (::futimes(FD, Times))
|
|
return std::error_code(errno, std::generic_category());
|
|
return std::error_code();
|
|
#else
|
|
#warning Missing futimes() and futimens()
|
|
return make_error_code(errc::function_not_supported);
|
|
#endif
|
|
}
|
|
|
|
std::error_code mapped_file_region::init(int FD, uint64_t Offset,
|
|
mapmode Mode) {
|
|
assert(Size != 0);
|
|
|
|
int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
|
|
int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
|
|
#if defined(__APPLE__)
|
|
//----------------------------------------------------------------------
|
|
// Newer versions of MacOSX have a flag that will allow us to read from
|
|
// binaries whose code signature is invalid without crashing by using
|
|
// the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
|
|
// is mapped we can avoid crashing and return zeroes to any pages we try
|
|
// to read if the media becomes unavailable by using the
|
|
// MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
|
|
// with PROT_READ, so take care not to specify them otherwise.
|
|
//----------------------------------------------------------------------
|
|
if (Mode == readonly) {
|
|
#if defined(MAP_RESILIENT_CODESIGN)
|
|
flags |= MAP_RESILIENT_CODESIGN;
|
|
#endif
|
|
#if defined(MAP_RESILIENT_MEDIA)
|
|
flags |= MAP_RESILIENT_MEDIA;
|
|
#endif
|
|
}
|
|
#endif // #if defined (__APPLE__)
|
|
|
|
Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
|
|
if (Mapping == MAP_FAILED)
|
|
return std::error_code(errno, std::generic_category());
|
|
return std::error_code();
|
|
}
|
|
|
|
mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
|
|
uint64_t offset, std::error_code &ec)
|
|
: Size(length), Mapping() {
|
|
ec = init(fd, offset, mode);
|
|
if (ec)
|
|
Mapping = nullptr;
|
|
}
|
|
|
|
mapped_file_region::~mapped_file_region() {
|
|
if (Mapping)
|
|
::munmap(Mapping, Size);
|
|
}
|
|
|
|
size_t mapped_file_region::size() const {
|
|
assert(Mapping && "Mapping failed but used anyway!");
|
|
return Size;
|
|
}
|
|
|
|
char *mapped_file_region::data() const {
|
|
assert(Mapping && "Mapping failed but used anyway!");
|
|
return reinterpret_cast<char*>(Mapping);
|
|
}
|
|
|
|
const char *mapped_file_region::const_data() const {
|
|
assert(Mapping && "Mapping failed but used anyway!");
|
|
return reinterpret_cast<const char*>(Mapping);
|
|
}
|
|
|
|
int mapped_file_region::alignment() {
|
|
return Process::getPageSize();
|
|
}
|
|
|
|
std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
|
|
StringRef path,
|
|
bool follow_symlinks) {
|
|
SmallString<128> path_null(path);
|
|
DIR *directory = ::opendir(path_null.c_str());
|
|
if (!directory)
|
|
return std::error_code(errno, std::generic_category());
|
|
|
|
it.IterationHandle = reinterpret_cast<intptr_t>(directory);
|
|
// Add something for replace_filename to replace.
|
|
path::append(path_null, ".");
|
|
it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
|
|
return directory_iterator_increment(it);
|
|
}
|
|
|
|
std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
|
|
if (it.IterationHandle)
|
|
::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
|
|
it.IterationHandle = 0;
|
|
it.CurrentEntry = directory_entry();
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
|
|
errno = 0;
|
|
dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
|
|
if (cur_dir == nullptr && errno != 0) {
|
|
return std::error_code(errno, std::generic_category());
|
|
} else if (cur_dir != nullptr) {
|
|
StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
|
|
if ((name.size() == 1 && name[0] == '.') ||
|
|
(name.size() == 2 && name[0] == '.' && name[1] == '.'))
|
|
return directory_iterator_increment(it);
|
|
it.CurrentEntry.replace_filename(name);
|
|
} else
|
|
return directory_iterator_destruct(it);
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
ErrorOr<basic_file_status> directory_entry::status() const {
|
|
file_status s;
|
|
if (auto EC = fs::status(Path, s, FollowSymlinks))
|
|
return EC;
|
|
return s;
|
|
}
|
|
|
|
#if !defined(F_GETPATH)
|
|
static bool hasProcSelfFD() {
|
|
// If we have a /proc filesystem mounted, we can quickly establish the
|
|
// real name of the file with readlink
|
|
static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
|
|
return Result;
|
|
}
|
|
#endif
|
|
|
|
std::error_code openFileForRead(const Twine &Name, int &ResultFD,
|
|
SmallVectorImpl<char> *RealPath) {
|
|
SmallString<128> Storage;
|
|
StringRef P = Name.toNullTerminatedStringRef(Storage);
|
|
int OpenFlags = O_RDONLY;
|
|
#ifdef O_CLOEXEC
|
|
OpenFlags |= O_CLOEXEC;
|
|
#endif
|
|
if ((ResultFD = sys::RetryAfterSignal(-1, open, P.begin(), OpenFlags)) < 0)
|
|
return std::error_code(errno, std::generic_category());
|
|
#ifndef O_CLOEXEC
|
|
int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
|
|
(void)r;
|
|
assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
|
|
#endif
|
|
// Attempt to get the real name of the file, if the user asked
|
|
if(!RealPath)
|
|
return std::error_code();
|
|
RealPath->clear();
|
|
#if defined(F_GETPATH)
|
|
// When F_GETPATH is availble, it is the quickest way to get
|
|
// the real path name.
|
|
char Buffer[MAXPATHLEN];
|
|
if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
|
|
RealPath->append(Buffer, Buffer + strlen(Buffer));
|
|
#else
|
|
char Buffer[PATH_MAX];
|
|
if (hasProcSelfFD()) {
|
|
char ProcPath[64];
|
|
snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
|
|
ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
|
|
if (CharCount > 0)
|
|
RealPath->append(Buffer, Buffer + CharCount);
|
|
} else {
|
|
// Use ::realpath to get the real path name
|
|
if (::realpath(P.begin(), Buffer) != nullptr)
|
|
RealPath->append(Buffer, Buffer + strlen(Buffer));
|
|
}
|
|
#endif
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
|
|
sys::fs::OpenFlags Flags, unsigned Mode) {
|
|
// Verify that we don't have both "append" and "excl".
|
|
assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
|
|
"Cannot specify both 'excl' and 'append' file creation flags!");
|
|
|
|
int OpenFlags = O_CREAT;
|
|
|
|
#ifdef O_CLOEXEC
|
|
OpenFlags |= O_CLOEXEC;
|
|
#endif
|
|
|
|
if (Flags & F_RW)
|
|
OpenFlags |= O_RDWR;
|
|
else
|
|
OpenFlags |= O_WRONLY;
|
|
|
|
if (Flags & F_Append)
|
|
OpenFlags |= O_APPEND;
|
|
else
|
|
OpenFlags |= O_TRUNC;
|
|
|
|
if (Flags & F_Excl)
|
|
OpenFlags |= O_EXCL;
|
|
|
|
SmallString<128> Storage;
|
|
StringRef P = Name.toNullTerminatedStringRef(Storage);
|
|
if ((ResultFD = sys::RetryAfterSignal(-1, open, P.begin(), OpenFlags, Mode)) < 0)
|
|
return std::error_code(errno, std::generic_category());
|
|
#ifndef O_CLOEXEC
|
|
int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
|
|
(void)r;
|
|
assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
|
|
#endif
|
|
return std::error_code();
|
|
}
|
|
|
|
template <typename T>
|
|
static std::error_code remove_directories_impl(const T &Entry,
|
|
bool IgnoreErrors) {
|
|
std::error_code EC;
|
|
directory_iterator Begin(Entry, EC, false);
|
|
directory_iterator End;
|
|
while (Begin != End) {
|
|
auto &Item = *Begin;
|
|
ErrorOr<basic_file_status> st = Item.status();
|
|
if (!st && !IgnoreErrors)
|
|
return st.getError();
|
|
|
|
if (is_directory(*st)) {
|
|
EC = remove_directories_impl(Item, IgnoreErrors);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
}
|
|
|
|
EC = fs::remove(Item.path(), true);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
|
|
Begin.increment(EC);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
}
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
|
|
auto EC = remove_directories_impl(path, IgnoreErrors);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
EC = fs::remove(path, true);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
|
|
bool expand_tilde) {
|
|
dest.clear();
|
|
if (path.isTriviallyEmpty())
|
|
return std::error_code();
|
|
|
|
if (expand_tilde) {
|
|
SmallString<128> Storage;
|
|
path.toVector(Storage);
|
|
expandTildeExpr(Storage);
|
|
return real_path(Storage, dest, false);
|
|
}
|
|
|
|
int fd;
|
|
std::error_code EC = openFileForRead(path, fd, &dest);
|
|
|
|
if (EC)
|
|
return EC;
|
|
::close(fd);
|
|
return std::error_code();
|
|
}
|
|
|
|
} // end namespace fs
|
|
|
|
namespace path {
|
|
|
|
bool home_directory(SmallVectorImpl<char> &result) {
|
|
char *RequestedDir = getenv("HOME");
|
|
if (!RequestedDir) {
|
|
struct passwd *pw = getpwuid(getuid());
|
|
if (pw && pw->pw_dir)
|
|
RequestedDir = pw->pw_dir;
|
|
}
|
|
if (!RequestedDir)
|
|
return false;
|
|
|
|
result.clear();
|
|
result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
return true;
|
|
}
|
|
|
|
static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
|
|
#if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
|
|
// On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
|
|
// macros defined in <unistd.h> on darwin >= 9
|
|
int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
|
|
: _CS_DARWIN_USER_CACHE_DIR;
|
|
size_t ConfLen = confstr(ConfName, nullptr, 0);
|
|
if (ConfLen > 0) {
|
|
do {
|
|
Result.resize(ConfLen);
|
|
ConfLen = confstr(ConfName, Result.data(), Result.size());
|
|
} while (ConfLen > 0 && ConfLen != Result.size());
|
|
|
|
if (ConfLen > 0) {
|
|
assert(Result.back() == 0);
|
|
Result.pop_back();
|
|
return true;
|
|
}
|
|
|
|
Result.clear();
|
|
}
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
|
|
// First try using XDG_CACHE_HOME env variable,
|
|
// as specified in XDG Base Directory Specification at
|
|
// http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
|
|
if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
|
|
Result.clear();
|
|
Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
|
|
return true;
|
|
}
|
|
|
|
// Try Darwin configuration query
|
|
if (getDarwinConfDir(false, Result))
|
|
return true;
|
|
|
|
// Use "$HOME/.cache" if $HOME is available
|
|
if (home_directory(Result)) {
|
|
append(Result, ".cache");
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const char *getEnvTempDir() {
|
|
// Check whether the temporary directory is specified by an environment
|
|
// variable.
|
|
const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
|
|
for (const char *Env : EnvironmentVariables) {
|
|
if (const char *Dir = std::getenv(Env))
|
|
return Dir;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
static const char *getDefaultTempDir(bool ErasedOnReboot) {
|
|
#ifdef P_tmpdir
|
|
if ((bool)P_tmpdir)
|
|
return P_tmpdir;
|
|
#endif
|
|
|
|
if (ErasedOnReboot)
|
|
return "/tmp";
|
|
return "/var/tmp";
|
|
}
|
|
|
|
void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
|
|
Result.clear();
|
|
|
|
if (ErasedOnReboot) {
|
|
// There is no env variable for the cache directory.
|
|
if (const char *RequestedDir = getEnvTempDir()) {
|
|
Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (getDarwinConfDir(ErasedOnReboot, Result))
|
|
return;
|
|
|
|
const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
|
|
Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
}
|
|
|
|
} // end namespace path
|
|
|
|
} // end namespace sys
|
|
} // end namespace llvm
|