root/lib/vfs/vfs.h

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INCLUDED FROM


   1 
   2 /**
   3  * \file
   4  * \brief Header: Virtual File System switch code
   5  */
   6 
   7 #ifndef MC__VFS_VFS_H
   8 #define MC__VFS_VFS_H
   9 
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <dirent.h>             /* DIR */
  13 #ifdef HAVE_UTIMENSAT
  14 #include <sys/time.h>
  15 #elif defined (HAVE_UTIME_H)
  16 #include <utime.h>
  17 #endif
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <stddef.h>
  21 
  22 #include "lib/global.h"
  23 
  24 #include "path.h"
  25 
  26 /*** typedefs(not structures) and defined constants **********************************************/
  27 
  28 #define VFS_CLASS(a) ((struct vfs_class *) (a))
  29 
  30 #if defined (ENABLE_VFS_FTP) || defined (ENABLE_VFS_FISH)
  31 #define ENABLE_VFS_NET 1
  32 #endif
  33 
  34 /**
  35  * This is the type of callback function passed to vfs_fill_names.
  36  * It gets the name of the virtual file system as its first argument.
  37  * See also:
  38  *    vfs_fill_names().
  39  */
  40 
  41 #define VFS_ENCODING_PREFIX "#enc:"
  42 
  43 #define O_ALL (O_CREAT | O_EXCL | O_NOCTTY | O_NDELAY | O_SYNC | O_WRONLY | O_RDWR | O_RDONLY)
  44 /* Midnight commander code should _not_ use other flags than those
  45    listed above and O_APPEND */
  46 
  47 #if (O_ALL & O_APPEND)
  48 #warning "Unexpected problem with flags, O_LINEAR disabled, contact pavel@ucw.cz"
  49 #define O_LINEAR 0
  50 #define IS_LINEAR(a) 0
  51 #define NO_LINEAR(a) a
  52 #else
  53 #define O_LINEAR O_APPEND
  54 #define IS_LINEAR(a) ((a) == (O_RDONLY | O_LINEAR))     /* Return only 0 and 1 ! */
  55 #define NO_LINEAR(a) (((a) == (O_RDONLY | O_LINEAR)) ? O_RDONLY : (a))
  56 #endif
  57 
  58 /* O_LINEAR is strange beast, be careful. If you open file asserting
  59  * O_RDONLY | O_LINEAR, you promise:
  60  *
  61  *      a) to read file linearly from beginning to the end
  62  *      b) not to open another file before you close this one
  63  *              (this will likely go away in future)
  64  *      as a special gift, you may
  65  *      c) lseek() immediately after open(), giving ftpfs chance to
  66  *         reget. Be warned that this lseek() can fail, and you _have_
  67  *         to handle that gratefully.
  68  *
  69  * O_LINEAR allows filesystems not to create temporary file in some
  70  * cases (ftp transfer).                                -- pavel@ucw.cz
  71  */
  72 
  73 /* And now some defines for our errors. */
  74 
  75 #ifdef ENOMSG
  76 #define E_UNKNOWN ENOMSG        /* if we do not know what error happened */
  77 #else
  78 #define E_UNKNOWN EIO           /* if we do not know what error happened */
  79 #endif
  80 
  81 #ifdef EREMOTEIO
  82 #define E_REMOTE EREMOTEIO      /* if other side of ftp/fish reports error */
  83 #else
  84 #define E_REMOTE ENETUNREACH    /* :-( there's no EREMOTEIO on some systems */
  85 #endif
  86 
  87 #ifdef EPROTO
  88 #define E_PROTO EPROTO          /* if other side fails to follow protocol */
  89 #else
  90 #define E_PROTO EIO
  91 #endif
  92 
  93 typedef void (*fill_names_f) (const char *);
  94 
  95 typedef void *vfsid;
  96 
  97 #ifdef HAVE_UTIMENSAT
  98 typedef struct timespec mc_timesbuf_t[2];
  99 #else
 100 typedef struct utimbuf mc_timesbuf_t;
 101 #endif
 102 
 103 /*** enums ***************************************************************************************/
 104 
 105 typedef enum
 106 {
 107     VFSF_UNKNOWN = 0,
 108     VFSF_LOCAL = 1 << 0,        /* Class is local (not virtual) filesystem */
 109     VFSF_NOLINKS = 1 << 1,      /* Hard links not supported */
 110 
 111     VFSF_REMOTE = 1 << 2,
 112     VFSF_READONLY = 1 << 3,
 113     VFSF_USETMP = 1 << 4
 114 } vfs_flags_t;
 115 
 116 /* Operations for mc_ctl - on open file */
 117 enum
 118 {
 119     VFS_CTL_IS_NOTREADY
 120 };
 121 
 122 /* Operations for mc_setctl - on path */
 123 enum
 124 {
 125     VFS_SETCTL_FORGET,
 126     VFS_SETCTL_RUN,
 127     VFS_SETCTL_LOGFILE,
 128     VFS_SETCTL_FLUSH,           /* invalidate directory cache */
 129 
 130     /* Setting this makes vfs layer give out potentially incorrect data,
 131        but it also makes some operations much faster. Use with caution. */
 132     VFS_SETCTL_STALE_DATA
 133 };
 134 
 135 /*** structures declarations (and typedefs of structures)*****************************************/
 136 
 137 typedef struct vfs_class
 138 {
 139     const char *name;           /* "FIles over SHell" */
 140     vfs_flags_t flags;
 141     const char *prefix;         /* "fish:" */
 142     int verrno;                 /* can't use errno because glibc2 might define errno as function */
 143     gboolean flush;             /* if set to TRUE, invalidate directory cache */
 144     FILE *logfile;
 145 
 146     /* *INDENT-OFF* */
 147     int (*init) (struct vfs_class * me);
 148     void (*done) (struct vfs_class * me);
 149 
 150     /**
 151      * The fill_names method shall call the callback function for every
 152      * filesystem name that this vfs module supports.
 153      */
 154     void (*fill_names) (struct vfs_class * me, fill_names_f);
 155 
 156     /**
 157      * The which() method shall return the index of the vfs subsystem
 158      * or -1 if this vfs cannot handle the given pathname.
 159      */
 160     int (*which) (struct vfs_class * me, const char *path);
 161 
 162     void *(*open) (const vfs_path_t * vpath, int flags, mode_t mode);
 163     int (*close) (void *vfs_info);
 164     ssize_t (*read) (void *vfs_info, char *buffer, size_t count);
 165     ssize_t (*write) (void *vfs_info, const char *buf, size_t count);
 166 
 167     void *(*opendir) (const vfs_path_t * vpath);
 168     struct vfs_dirent *(*readdir) (void *vfs_info);
 169     int (*closedir) (void *vfs_info);
 170 
 171     int (*stat) (const vfs_path_t * vpath, struct stat * buf);
 172     int (*lstat) (const vfs_path_t * vpath, struct stat * buf);
 173     int (*fstat) (void *vfs_info, struct stat * buf);
 174 
 175     int (*chmod) (const vfs_path_t * vpath, mode_t mode);
 176     int (*chown) (const vfs_path_t * vpath, uid_t owner, gid_t group);
 177     int (*utime) (const vfs_path_t * vpath, mc_timesbuf_t * times);
 178 
 179     int (*readlink) (const vfs_path_t * vpath, char *buf, size_t size);
 180     int (*symlink) (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 181     int (*link) (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 182     int (*unlink) (const vfs_path_t * vpath);
 183     int (*rename) (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 184     int (*chdir) (const vfs_path_t * vpath);
 185     int (*ferrno) (struct vfs_class * me);
 186     off_t (*lseek) (void *vfs_info, off_t offset, int whence);
 187     int (*mknod) (const vfs_path_t * vpath, mode_t mode, dev_t dev);
 188 
 189     vfsid (*getid) (const vfs_path_t * vpath);
 190 
 191     gboolean (*nothingisopen) (vfsid id);
 192     void (*free) (vfsid id);
 193 
 194     vfs_path_t *(*getlocalcopy) (const vfs_path_t * vpath);
 195     int (*ungetlocalcopy) (const vfs_path_t * vpath, const vfs_path_t * local_vpath,
 196                            gboolean has_changed);
 197 
 198     int (*mkdir) (const vfs_path_t * vpath, mode_t mode);
 199     int (*rmdir) (const vfs_path_t * vpath);
 200 
 201     int (*ctl) (void *vfs_info, int ctlop, void *arg);
 202     int (*setctl) (const vfs_path_t * vpath, int ctlop, void *arg);
 203     /* *INDENT-ON* */
 204 } vfs_class;
 205 
 206 /*
 207  * This struct is used instead of standard dirent to hold file name of any length
 208  * (not limited to NAME_MAX).
 209  */
 210 struct vfs_dirent
 211 {
 212     /* private */
 213     GString *d_name_str;
 214 
 215     /* public */
 216     ino_t d_ino;
 217     char *d_name;               /* Alias of d_name_str->str */
 218 };
 219 
 220 /*** global variables defined in .c file *********************************************************/
 221 
 222 extern int vfs_timeout;
 223 
 224 #ifdef ENABLE_VFS_NET
 225 extern int use_netrc;
 226 #endif
 227 
 228 /*** declarations of public functions ************************************************************/
 229 
 230 /* lib/vfs/direntry.c: */
 231 void vfs_init_class (struct vfs_class *vclass, const char *name, vfs_flags_t flags,
 232                      const char *prefix);
 233 
 234 void *vfs_s_open (const vfs_path_t * vpath, int flags, mode_t mode);
 235 int vfs_s_stat (const vfs_path_t * vpath, struct stat *buf);
 236 int vfs_s_lstat (const vfs_path_t * vpath, struct stat *buf);
 237 int vfs_s_fstat (void *fh, struct stat *buf);
 238 
 239 void vfs_adjust_stat (struct stat *s);
 240 
 241 vfsid vfs_getid (const vfs_path_t * vpath);
 242 
 243 void vfs_init (void);
 244 void vfs_shut (void);
 245 /* Register a file system class */
 246 gboolean vfs_register_class (struct vfs_class *vfs);
 247 void vfs_unregister_class (struct vfs_class *vfs);
 248 
 249 void vfs_setup_work_dir (void);
 250 
 251 void vfs_timeout_handler (void);
 252 int vfs_timeouts (void);
 253 void vfs_expire (gboolean now);
 254 
 255 const char *vfs_get_current_dir (void);
 256 char *vfs_get_current_dir_n (void);
 257 const vfs_path_t *vfs_get_raw_current_dir (void);
 258 void vfs_set_raw_current_dir (const vfs_path_t * vpath);
 259 
 260 gboolean vfs_current_is_local (void);
 261 gboolean vfs_file_is_local (const vfs_path_t * vpath);
 262 
 263 char *vfs_strip_suffix_from_filename (const char *filename);
 264 
 265 vfs_flags_t vfs_file_class_flags (const vfs_path_t * vpath);
 266 
 267 /* translate path back to terminal encoding, remove all #enc:
 268  * every invalid character is replaced with question mark
 269  * return static buffer */
 270 const char *vfs_translate_path (const char *path);
 271 /* return new string */
 272 char *vfs_translate_path_n (const char *path);
 273 
 274 void vfs_stamp_path (const vfs_path_t * path);
 275 
 276 void vfs_release_path (const vfs_path_t * vpath);
 277 
 278 struct vfs_dirent *vfs_dirent_init (struct vfs_dirent *d, const char *fname, ino_t ino);
 279 void vfs_dirent_assign (struct vfs_dirent *d, const char *fname, ino_t ino);
 280 void vfs_dirent_free (struct vfs_dirent *d);
 281 
 282 void vfs_fill_names (fill_names_f);
 283 
 284 /* *INDENT-OFF* */
 285 void vfs_print_message (const char *msg, ...) G_GNUC_PRINTF (1, 2);
 286 /* *INDENT-ON* */
 287 
 288 int vfs_ferrno (struct vfs_class *vfs);
 289 
 290 int vfs_new_handle (struct vfs_class *vclass, void *fsinfo);
 291 
 292 struct vfs_class *vfs_class_find_by_handle (int handle, void **fsinfo);
 293 
 294 void vfs_free_handle (int handle);
 295 
 296 void vfs_setup_cwd (void);
 297 char *_vfs_get_cwd (void);
 298 
 299 int vfs_preallocate (int dest_desc, off_t src_fsize, off_t dest_fsize);
 300 
 301 int vfs_clone_file (int dest_vfs_fd, int src_vfs_fd);
 302 
 303 /**
 304  * Interface functions described in interface.c
 305  */
 306 ssize_t mc_read (int handle, void *buffer, size_t count);
 307 ssize_t mc_write (int handle, const void *buffer, size_t count);
 308 int mc_utime (const vfs_path_t * vpath, mc_timesbuf_t * times);
 309 int mc_readlink (const vfs_path_t * vpath, char *buf, size_t bufsiz);
 310 int mc_close (int handle);
 311 off_t mc_lseek (int fd, off_t offset, int whence);
 312 DIR *mc_opendir (const vfs_path_t * vpath);
 313 struct vfs_dirent *mc_readdir (DIR * dirp);
 314 int mc_closedir (DIR * dir);
 315 int mc_stat (const vfs_path_t * vpath, struct stat *buf);
 316 int mc_mknod (const vfs_path_t * vpath, mode_t mode, dev_t dev);
 317 int mc_link (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 318 int mc_mkdir (const vfs_path_t * vpath, mode_t mode);
 319 int mc_rmdir (const vfs_path_t * vpath);
 320 int mc_fstat (int fd, struct stat *buf);
 321 int mc_lstat (const vfs_path_t * vpath, struct stat *buf);
 322 int mc_symlink (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 323 int mc_rename (const vfs_path_t * vpath1, const vfs_path_t * vpath2);
 324 int mc_chmod (const vfs_path_t * vpath, mode_t mode);
 325 int mc_chown (const vfs_path_t * vpath, uid_t owner, gid_t group);
 326 int mc_chdir (const vfs_path_t * vpath);
 327 int mc_unlink (const vfs_path_t * vpath);
 328 int mc_ctl (int fd, int ctlop, void *arg);
 329 int mc_setctl (const vfs_path_t * vpath, int ctlop, void *arg);
 330 int mc_open (const vfs_path_t * vpath, int flags, ...);
 331 vfs_path_t *mc_getlocalcopy (const vfs_path_t * pathname_vpath);
 332 int mc_ungetlocalcopy (const vfs_path_t * pathname_vpath, const vfs_path_t * local_vpath,
 333                        gboolean has_changed);
 334 int mc_mkstemps (vfs_path_t ** pname_vpath, const char *prefix, const char *suffix);
 335 
 336 /* Creating temporary files safely */
 337 const char *mc_tmpdir (void);
 338 
 339 
 340 /*** inline functions ****************************************************************************/
 341 
 342 #endif /* MC_VFS_VFS_H */

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