/* dir.cc: Posix directory-related routines Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007, 2008, 2009, 2010, 2012 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include #include #define _COMPILING_NEWLIB #include #include "cygerrno.h" #include "security.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "cygtls.h" #include "tls_pbuf.h" extern "C" int dirfd (DIR *dir) { myfault efault; if (efault.faulted (EFAULT)) return -1; if (dir->__d_cookie != __DIRENT_COOKIE) { set_errno (EBADF); syscall_printf ("-1 = dirfd (%p)", dir); return -1; } return dir->__d_fd; } /* Symbol kept for backward compatibility. Don't remove. Don't declare in public header file. */ extern "C" DIR * __opendir_with_d_ino (const char *name) { return opendir (name); } /* opendir: POSIX 5.1.2.1 */ extern "C" DIR * opendir (const char *name) { fhandler_base *fh; DIR *res; fh = build_fh_name (name, PC_SYM_FOLLOW); if (!fh) res = NULL; else if (fh->exists ()) res = fh->opendir (-1); else { set_errno (ENOENT); res = NULL; } if (!res && fh) delete fh; return res; } extern "C" DIR * fdopendir (int fd) { DIR *res = NULL; cygheap_fdget cfd (fd); if (cfd >= 0) res = cfd->opendir (fd); return res; } static int readdir_worker (DIR *dir, dirent *de) { myfault efault; if (efault.faulted ()) return EFAULT; if (dir->__d_cookie != __DIRENT_COOKIE) { syscall_printf ("%p = readdir (%p)", NULL, dir); return EBADF; } de->d_ino = 0; de->d_type = DT_UNKNOWN; memset (&de->__d_unused1, 0, sizeof (de->__d_unused1)); int res = ((fhandler_base *) dir->__fh)->readdir (dir, de); if (res == ENMFILE) { if (!(dir->__flags & dirent_saw_dot)) { strcpy (de->d_name, "."); dir->__flags |= dirent_saw_dot; dir->__d_position++; res = 0; } else if (!(dir->__flags & dirent_saw_dot_dot)) { strcpy (de->d_name, ".."); dir->__flags |= dirent_saw_dot_dot; dir->__d_position++; res = 0; } } if (!res && !de->d_ino) { bool is_dot = false; bool is_dot_dot = false; if (de->d_name[0] == '.') { if (de->d_name[1] == '\0') is_dot = true; else if (de->d_name[1] == '.' && de->d_name[2] == '\0') is_dot_dot = true; } if (is_dot_dot && !(dir->__flags & dirent_isroot)) de->d_ino = readdir_get_ino (((fhandler_base *) dir->__fh)->get_name (), true); else { /* Compute d_ino by combining filename hash with directory hash. */ de->d_ino = ((fhandler_base *) dir->__fh)->get_ino (); if (!is_dot && !is_dot_dot) { PUNICODE_STRING w32name = ((fhandler_base *) dir->__fh)->pc.get_nt_native_path (); DWORD devn = ((fhandler_base *) dir->__fh)->get_device (); /* Paths below /proc don't have a Win32 pendant. */ if (isproc_dev (devn)) de->d_ino = hash_path_name (de->d_ino, L"/"); else if (w32name->Buffer[w32name->Length / sizeof (WCHAR) - 1] != L'\\') de->d_ino = hash_path_name (de->d_ino, L"\\"); de->d_ino = hash_path_name (de->d_ino, de->d_name); } } } /* This fills out the old 32 bit d_ino field for old applications, build under Cygwin before 1.5.x. */ de->__d_internal1 = de->d_ino; return res; } /* readdir: POSIX 5.1.2.1 */ extern "C" struct dirent * readdir (DIR *dir) { int res = readdir_worker (dir, dir->__d_dirent); if (res == 0) return dir->__d_dirent; if (res != ENMFILE) set_errno (res); return NULL; } extern "C" int readdir_r (DIR *dir, dirent *de, dirent **ode) { int res = readdir_worker (dir, de); if (!res) *ode = de; else { *ode = NULL; if (res == ENMFILE) res = 0; } return res; } /* telldir */ extern "C" long telldir (DIR *dir) { myfault efault; if (efault.faulted (EFAULT)) return -1; if (dir->__d_cookie != __DIRENT_COOKIE) return 0; return ((fhandler_base *) dir->__fh)->telldir (dir); } /* telldir was never defined using off_t in POSIX, only in early versions of glibc. We have to keep the function in as entry point for backward compatibility. */ extern "C" _off64_t telldir64 (DIR *dir) { return (_off64_t) telldir (dir); } /* seekdir */ extern "C" void seekdir (DIR *dir, long loc) { myfault efault; if (efault.faulted (EFAULT)) return; if (dir->__d_cookie != __DIRENT_COOKIE) return; dir->__flags &= dirent_info_mask; return ((fhandler_base *) dir->__fh)->seekdir (dir, loc); } /* seekdir was never defined using off_t in POSIX, only in early versions of glibc. We have to keep the function in as entry point for backward compatibility. */ extern "C" void seekdir64 (DIR *dir, _off64_t loc) { seekdir (dir, (long) loc); } /* rewinddir: POSIX 5.1.2.1 */ extern "C" void rewinddir (DIR *dir) { myfault efault; if (efault.faulted (EFAULT)) return; if (dir->__d_cookie != __DIRENT_COOKIE) return; dir->__flags &= dirent_info_mask; return ((fhandler_base *) dir->__fh)->rewinddir (dir); } /* closedir: POSIX 5.1.2.1 */ extern "C" int closedir (DIR *dir) { myfault efault; if (efault.faulted (EFAULT)) return -1; if (dir->__d_cookie != __DIRENT_COOKIE) { set_errno (EBADF); syscall_printf ("%R = closedir(%p)", -1, dir); return -1; } /* Reset the marker in case the caller tries to use `dir' again. */ dir->__d_cookie = 0; int res = ((fhandler_base *) dir->__fh)->closedir (dir); close (dir->__d_fd); free (dir->__d_dirname); free (dir->__d_dirent); free (dir); syscall_printf ("%R = closedir(%p)", res); return res; } /* mkdir: POSIX 5.4.1.1 */ extern "C" int mkdir (const char *dir, mode_t mode) { int res = -1; fhandler_base *fh = NULL; tmp_pathbuf tp; myfault efault; if (efault.faulted (EFAULT)) return -1; /* POSIX says mkdir("symlink-to-missing/") should create the directory "missing", but Linux rejects it with EEXIST. Copy Linux behavior for now. */ if (!*dir) { set_errno (ENOENT); goto done; } if (isdirsep (dir[strlen (dir) - 1])) { /* This converts // to /, but since both give EEXIST, we're okay. */ char *buf; char *p = stpcpy (buf = tp.c_get (), dir) - 1; dir = buf; while (p > dir && isdirsep (*p)) *p-- = '\0'; } if (!(fh = build_fh_name (dir, PC_SYM_NOFOLLOW))) goto done; /* errno already set */; if (fh->error ()) { debug_printf ("got %d error from build_fh_name", fh->error ()); set_errno (fh->error ()); } else if (has_dot_last_component (dir, true)) set_errno (fh->exists () ? EEXIST : ENOENT); else if (!fh->mkdir (mode)) res = 0; delete fh; done: syscall_printf ("%R = mkdir(%s, %d)", res, dir, mode); return res; } /* rmdir: POSIX 5.5.2.1 */ extern "C" int rmdir (const char *dir) { int res = -1; fhandler_base *fh = NULL; myfault efault; if (efault.faulted (EFAULT)) return -1; if (!(fh = build_fh_name (dir, PC_SYM_NOFOLLOW))) goto done; /* errno already set */; if (fh->error ()) { debug_printf ("got %d error from build_fh_name", fh->error ()); set_errno (fh->error ()); } else if (!fh->exists ()) set_errno (ENOENT); else if (has_dot_last_component (dir, false)) set_errno (EINVAL); else if (!fh->rmdir ()) res = 0; delete fh; done: syscall_printf ("%R = rmdir(%s)", res, dir); return res; }