1 /*****************************************************************************
2 * filesystem.c: POSIX file system helpers
3 *****************************************************************************
4 * Copyright (C) 2005-2006 VLC authors and VideoLAN
5 * Copyright © 2005-2008 Rémi Denis-Courmont
7 * Authors: Rémi Denis-Courmont <rem # videolan.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
31 #include <limits.h> /* NAME_MAX */
34 #include <sys/types.h>
39 # define lstat(a, b) stat(a, b)
42 #include <sys/socket.h>
44 #include <vlc_common.h>
46 #include "libvlc.h" /* vlc_mkdir */
49 * Opens a system file handle.
51 * @param filename file path to open (with UTF-8 encoding)
52 * @param flags open() flags, see the C library open() documentation
53 * @return a file handle on success, -1 on error (see errno).
54 * @note Contrary to standard open(), this function returns file handles
55 * with the close-on-exec flag enabled.
57 int vlc_open (const char *filename, int flags, ...)
59 unsigned int mode = 0;
64 mode = va_arg (ap, unsigned int);
71 int fd = open (filename, flags, mode);
73 fcntl (fd, F_SETFD, FD_CLOEXEC);
78 * Opens a system file handle relative to an existing directory handle.
80 * @param dir directory file descriptor
81 * @param filename file path to open (with UTF-8 encoding)
82 * @param flags open() flags, see the C library open() documentation
83 * @return a file handle on success, -1 on error (see errno).
84 * @note Contrary to standard open(), this function returns file handles
85 * with the close-on-exec flag enabled.
87 int vlc_openat (int dir, const char *filename, int flags, ...)
89 unsigned int mode = 0;
94 mode = va_arg (ap, unsigned int);
102 int fd = openat (dir, filename, flags, mode);
104 fcntl (fd, F_SETFD, FD_CLOEXEC);
107 VLC_UNUSED (filename);
118 * Creates a directory using UTF-8 paths.
120 * @param dirname a UTF-8 string with the name of the directory that you
122 * @param mode directory permissions
123 * @return 0 on success, -1 on error (see errno).
125 int vlc_mkdir (const char *dirname, mode_t mode)
127 return mkdir (dirname, mode);
131 * Opens a DIR pointer.
133 * @param dirname UTF-8 representation of the directory name
134 * @return a pointer to the DIR struct, or NULL in case of error.
135 * Release with standard closedir().
137 DIR *vlc_opendir (const char *dirname)
139 return opendir (dirname);
143 * Reads the next file name from an open directory.
145 * @param dir The directory that is being read
147 * @return a UTF-8 string of the directory entry. Use free() to release it.
148 * If there are no more entries in the directory, NULL is returned.
149 * If an error occurs, errno is set and NULL is returned.
151 char *vlc_readdir( DIR *dir )
153 /* Beware that readdir_r() assumes <buf> is large enough to hold the result
154 * dirent including the file name. A buffer overflow could occur otherwise.
155 * In particular, pathconf() and _POSIX_NAME_MAX cannot be used here. */
159 long len = fpathconf (dirfd (dir), _PC_NAME_MAX);
160 /* POSIX says there shall be room for NAME_MAX bytes at all times */
161 if (len == -1 || len < NAME_MAX)
163 len += sizeof (*ent) + 1 - sizeof (ent->d_name);
165 struct dirent *buf = malloc (len);
166 if (unlikely(buf == NULL))
169 int val = readdir_r (dir, buf, &ent);
172 else if (ent != NULL)
173 path = strdup (ent->d_name);
179 * Finds file/inode information, as stat().
180 * Consider using fstat() instead, if possible.
182 * @param filename UTF-8 file path
184 int vlc_stat (const char *filename, struct stat *buf)
186 return stat (filename, buf);
190 * Finds file/inode information, as lstat().
191 * Consider using fstat() instead, if possible.
193 * @param filename UTF-8 file path
195 int vlc_lstat (const char *filename, struct stat *buf)
197 return lstat (filename, buf);
203 * @param filename a UTF-8 string with the name of the file you want to delete.
204 * @return A 0 return value indicates success. A -1 return value indicates an
205 * error, and an error code is stored in errno
207 int vlc_unlink (const char *filename)
209 return unlink (filename);
213 * Moves a file atomically. This only works within a single file system.
215 * @param oldpath path to the file before the move
216 * @param newpath intended path to the file after the move
217 * @return A 0 return value indicates success. A -1 return value indicates an
218 * error, and an error code is stored in errno
220 int vlc_rename (const char *oldpath, const char *newpath)
222 return rename (oldpath, newpath);
226 * Determines the current working directory.
228 * @return the current working directory (must be free()'d)
231 char *vlc_getcwd (void)
234 const char *pwd = getenv ("PWD");
238 /* Make sure $PWD is correct */
239 if (stat (pwd, &s1) == 0 && stat (".", &s2) == 0
240 && s1.st_dev == s2.st_dev && s1.st_ino == s2.st_ino)
244 /* Otherwise iterate getcwd() until the buffer is big enough */
245 long path_max = pathconf (".", _PC_PATH_MAX);
246 size_t size = (path_max == -1 || path_max > 4096) ? 4096 : path_max;
250 char *buf = malloc (size);
251 if (unlikely(buf == NULL))
254 if (getcwd (buf, size) != NULL)
265 * Duplicates a file descriptor. The new file descriptor has the close-on-exec
266 * descriptor flag set.
267 * @return a new file descriptor or -1
269 int vlc_dup (int oldfd)
273 #ifdef F_DUPFD_CLOEXEC
274 newfd = fcntl (oldfd, F_DUPFD_CLOEXEC);
275 if (unlikely(newfd == -1 && errno == EINVAL))
279 if (likely(newfd != -1))
280 fcntl (newfd, F_SETFD, FD_CLOEXEC);
286 * Creates a pipe (see "man pipe" for further reference).
288 int vlc_pipe (int fds[2])
291 if (pipe2 (fds, O_CLOEXEC) == 0)
300 fcntl (fds[0], F_SETFD, FD_CLOEXEC);
301 fcntl (fds[1], F_SETFD, FD_CLOEXEC);
305 #include <vlc_network.h>
308 * Creates a socket file descriptor. The new file descriptor has the
309 * close-on-exec flag set.
310 * @param pf protocol family
311 * @param type socket type
312 * @param proto network protocol
313 * @param nonblock true to create a non-blocking socket
314 * @return a new file descriptor or -1
316 int vlc_socket (int pf, int type, int proto, bool nonblock)
321 type |= SOCK_CLOEXEC;
323 type |= SOCK_NONBLOCK;
324 fd = socket (pf, type, proto);
325 if (fd != -1 || errno != EINVAL)
328 type &= ~(SOCK_CLOEXEC|SOCK_NONBLOCK);
331 fd = socket (pf, type, proto);
335 fcntl (fd, F_SETFD, FD_CLOEXEC);
337 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
342 * Accepts an inbound connection request on a listening socket.
343 * The new file descriptor has the close-on-exec flag set.
344 * @param lfd listening socket file descriptor
345 * @param addr pointer to the peer address or NULL [OUT]
346 * @param alen pointer to the length of the peer address or NULL [OUT]
347 * @param nonblock whether to put the new socket in non-blocking mode
348 * @return a new file descriptor, or -1 on error.
350 int vlc_accept (int lfd, struct sockaddr *addr, socklen_t *alen, bool nonblock)
353 int flags = SOCK_CLOEXEC;
355 flags |= SOCK_NONBLOCK;
359 int fd = accept4 (lfd, addr, alen, flags);
363 while (errno == EINTR);
371 int fd = accept (lfd, addr, alen);
374 fcntl (fd, F_SETFD, FD_CLOEXEC);
376 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
380 while (errno == EINTR);