2 * SPDX-License-Identifier: BSD-3-Clause
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32 #include "namespace.h"
33 #include <sys/param.h>
43 #include "un-namespace.h"
45 #include "gen-private.h"
48 (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
49 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
51 extern int __getcwd(char *, size_t);
54 getcwd(char *pt, size_t size)
71 * If no buffer specified by the user, allocate one as necessary.
72 * If a buffer is specified, the size has to be non-zero. The path
73 * is built from the end of the buffer backwards.
87 if ((pt = malloc(ptsize = PATH_MAX)) == NULL)
91 if (__getcwd(pt, ept - pt) == 0) {
94 ept = pt + strlen(pt) - 1;
106 /* Save root values, so know when to stop. */
112 errno = 0; /* XXX readdir has no error return. */
114 for (first = 1;; first = 0) {
115 /* Stat the current level. */
116 if (dir != NULL ? _fstat(_dirfd(dir), &s) : lstat(".", &s))
119 /* Save current node values. */
123 /* Check for reaching root. */
124 if (root_dev == dev && root_ino == ino) {
127 * It's unclear that it's a requirement to copy the
128 * path to the beginning of the buffer, but it's always
129 * been that way and stuff would probably break.
131 bcopy(bpt, pt, ept - bpt);
133 (void) closedir(dir);
137 /* Open and stat parent directory. */
138 fd = _openat(dir != NULL ? _dirfd(dir) : AT_FDCWD,
139 "..", O_RDONLY | O_CLOEXEC);
143 (void) closedir(dir);
144 if (!(dir = fdopendir(fd)) || _fstat(_dirfd(dir), &s)) {
150 * If it's a mount point, have to stat each element because
151 * the inode number in the directory is for the entry in the
152 * parent directory, not the inode number of the mounted file.
155 if (s.st_dev == dev) {
157 if (!(dp = readdir(dir)))
159 if (dp->d_fileno == ino)
164 if (!(dp = readdir(dir)))
169 /* Save the first error for later. */
170 if (fstatat(_dirfd(dir), dp->d_name, &s,
171 AT_SYMLINK_NOFOLLOW)) {
177 if (s.st_dev == dev && s.st_ino == ino)
182 * Check for length of the current name, preceding slash,
185 while (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
194 if ((pt = reallocf(pt, ptsize *= 2)) == NULL)
198 bcopy(bpt, ept - len, len);
204 bcopy(dp->d_name, bpt, dp->d_namlen);
209 * If readdir set errno, use it, not any saved error; otherwise,
210 * didn't find the current directory in its parent directory, set
214 errno = save_errno ? save_errno : ENOENT;
222 (void) closedir(dir);