Linux - FUSE (Filesystem in Userspace) und Anjuta 2.0.2 IDE
-
Vor einer (sehr langen) Weile habe ich schon einmal mit C und Linux herumgespielt.
Allerdings einzeln - nicht beides miteinander. Nun versuche ich den Wiedereinstieg mit einer konkreten Absicht : Ich will einen Filesystemfilter schreiben.
- In einem bestimmten Verzeichnis liegen Dateien. Jeder Nutzer kann grundsätzlich über eine eigene Instanz meines Fuse-Programms darauf zugreifen. Hierzu wird die Instanz aber vorher bei einem Server (auf dem gleichen Rechner) fragen welche Dateien für diesen Nutzer sichbar sein sollen.
Klar, ich könnte das über SSHFS realisieren. Ich suche aber nach einem effektiveren Weg.
Vielleicht hat da jemand Tipps oder Links für mich.> Mein aktuellstes Problem ist, daß ich noch nicht einmal die Fuse-Beispiele kompilieren kann.
"-D_FILE_OFFSET_BITS=64" wird verlangt - was auch immer das heißt.
gcc -D_FILE_OFFSET_BITS=64 hello.c hello.c:86: error: unknown field ‘readdir’ specified in initializer hello.c:86: warning: initialization from incompatible pointer type hello.c:87: warning: initialization from incompatible pointer type hello.c:88: warning: initialization from incompatible pointer typegcc -D_FILE_OFFSET_BITS=64 fusexmp.c fusexmp.c:9:20: error: config.h: No such file or directory fusexmp.c:341: error: unknown field ‘access’ specified in initializer fusexmp.c:341: warning: initialization from incompatible pointer type fusexmp.c:343: error: unknown field ‘readdir’ specified in initializer fusexmp.c:343: warning: initialization from incompatible pointer type fusexmp.c:355: warning: initialization from incompatible pointer type fusexmp.c:356: warning: initialization from incompatible pointer type fusexmp.c:357: warning: initialization from incompatible pointer type fusexmp.c:358: warning: initialization from incompatible pointer type fusexmp.c:359: warning: initialization from incompatible pointer type fusexmp.c:360: warning: initialization from incompatible pointer typeDie config.h habe ich auch nicht gefunden.
> Anjuta :
Ich vermute mal, daß unter "Symbole"-"Tree" nichts angezeigt wird weil ich noch keine "Anjuta tag files" geladen habe. Unter "/usr/share/anjuta/" finde ich aber auch keine.
Wenn ich hello.c aus den examples des libfuse-dev - Pakets lade bekomme ich die nachricht
/usr/bin/create_global_tags.sh: 3:not found shift: 11:can't shift that manyobwohl die Datei da ist und schon auf rwxr-xr-x steht.
Da ich die Meldung nicht in die Zwischenablage übernehmen kann wollte ich sie speichern. Dabei wurde aber nur eine 0-Byte-Datei erzeugt.
-
Schwierig, schwierig. Könntest du eventuell auch dazuschreiben, wie dein Quelltext aussieht, der diese Fehler verursacht?
error: unknown field ‘readdir’ specified in initializer
Du hast ein Feld im Initialisierer angegeben, das nicht bekannt ist.
error: config.h: No such file or directory
Der Header wurde nicht gefunden
warning: initialization from incompatible pointer type
Du hast zwei unabhängige Pointertypen zugewiesen (ala
int* data = new char[20];)Edit: "-D_FILE_OFFSET_BITS=64" entspricht etwa einem
#define _FILE_OFFSET_BITS 64am Programmanfang.
-
Zunächst mal : Danke für die schnelle Antwort !
Wie gesagt es ist lange her und der source stammt aus dem libfuse-dev - Paket.
Ich fange gerade erst an mich dahin zu tasten, daß ich ihn irgendwann auch verstehe.
Irgendwie hatte ich die Hoffnung die Beispiele würden sich einfach so compilieren lassen.hello.c
/* FUSE: Filesystem in Userspace Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> This program can be distributed under the terms of the GNU GPL. See the file COPYING. */ #include <fuse.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <fcntl.h> static const char *hello_str = "Hello World!\n"; static const char *hello_path = "/hello"; static int hello_getattr(const char *path, struct stat *stbuf) { int res = 0; memset(stbuf, 0, sizeof(struct stat)); if(strcmp(path, "/") == 0) { stbuf->st_mode = S_IFDIR | 0755; stbuf->st_nlink = 2; } else if(strcmp(path, hello_path) == 0) { stbuf->st_mode = S_IFREG | 0444; stbuf->st_nlink = 1; stbuf->st_size = strlen(hello_str); } else res = -ENOENT; return res; } static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) { (void) offset; (void) fi; if(strcmp(path, "/") != 0) return -ENOENT; filler(buf, ".", NULL, 0); filler(buf, "..", NULL, 0); filler(buf, hello_path + 1, NULL, 0); return 0; } static int hello_open(const char *path, struct fuse_file_info *fi) { if(strcmp(path, hello_path) != 0) return -ENOENT; if((fi->flags & 3) != O_RDONLY) return -EACCES; return 0; } static int hello_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { size_t len; (void) fi; if(strcmp(path, hello_path) != 0) return -ENOENT; len = strlen(hello_str); if (offset < len) { if (offset + size > len) size = len - offset; memcpy(buf, hello_str + offset, size); } else size = 0; return size; } static struct fuse_operations hello_oper = { .getattr = hello_getattr, .readdir = hello_readdir, .open = hello_open, .read = hello_read, }; int main(int argc, char *argv[]) { return fuse_main(argc, argv, &hello_oper); }fusexmp.c
/* FUSE: Filesystem in Userspace Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> This program can be distributed under the terms of the GNU GPL. See the file COPYING. */ #include <config.h> #ifdef linux /* For pread()/pwrite() */ #define _XOPEN_SOURCE 500 #endif #include <fuse.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <dirent.h> #include <errno.h> #ifdef HAVE_SETXATTR #include <sys/xattr.h> #endif static int xmp_getattr(const char *path, struct stat *stbuf) { int res; res = lstat(path, stbuf); if (res == -1) return -errno; return 0; } static int xmp_access(const char *path, int mask) { int res; res = access(path, mask); if (res == -1) return -errno; return 0; } static int xmp_readlink(const char *path, char *buf, size_t size) { int res; res = readlink(path, buf, size - 1); if (res == -1) return -errno; buf[res] = '\0'; return 0; } static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) { DIR *dp; struct dirent *de; (void) offset; (void) fi; dp = opendir(path); if (dp == NULL) return -errno; while ((de = readdir(dp)) != NULL) { struct stat st; memset(&st, 0, sizeof(st)); st.st_ino = de->d_ino; st.st_mode = de->d_type << 12; if (filler(buf, de->d_name, &st, 0)) break; } closedir(dp); return 0; } static int xmp_mknod(const char *path, mode_t mode, dev_t rdev) { int res; /* On Linux this could just be 'mknod(path, mode, rdev)' but this is more portable */ if (S_ISREG(mode)) { res = open(path, O_CREAT | O_EXCL | O_WRONLY, mode); if (res >= 0) res = close(res); } else if (S_ISFIFO(mode)) res = mkfifo(path, mode); else res = mknod(path, mode, rdev); if (res == -1) return -errno; return 0; } static int xmp_mkdir(const char *path, mode_t mode) { int res; res = mkdir(path, mode); if (res == -1) return -errno; return 0; } static int xmp_unlink(const char *path) { int res; res = unlink(path); if (res == -1) return -errno; return 0; } static int xmp_rmdir(const char *path) { int res; res = rmdir(path); if (res == -1) return -errno; return 0; } static int xmp_symlink(const char *from, const char *to) { int res; res = symlink(from, to); if (res == -1) return -errno; return 0; } static int xmp_rename(const char *from, const char *to) { int res; res = rename(from, to); if (res == -1) return -errno; return 0; } static int xmp_link(const char *from, const char *to) { int res; res = link(from, to); if (res == -1) return -errno; return 0; } static int xmp_chmod(const char *path, mode_t mode) { int res; res = chmod(path, mode); if (res == -1) return -errno; return 0; } static int xmp_chown(const char *path, uid_t uid, gid_t gid) { int res; res = lchown(path, uid, gid); if (res == -1) return -errno; return 0; } static int xmp_truncate(const char *path, off_t size) { int res; res = truncate(path, size); if (res == -1) return -errno; return 0; } static int xmp_utime(const char *path, struct utimbuf *buf) { int res; res = utime(path, buf); if (res == -1) return -errno; return 0; } static int xmp_open(const char *path, struct fuse_file_info *fi) { int res; res = open(path, fi->flags); if (res == -1) return -errno; close(res); return 0; } static int xmp_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { int fd; int res; (void) fi; fd = open(path, O_RDONLY); if (fd == -1) return -errno; res = pread(fd, buf, size, offset); if (res == -1) res = -errno; close(fd); return res; } static int xmp_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { int fd; int res; (void) fi; fd = open(path, O_WRONLY); if (fd == -1) return -errno; res = pwrite(fd, buf, size, offset); if (res == -1) res = -errno; close(fd); return res; } static int xmp_statfs(const char *path, struct statvfs *stbuf) { int res; res = statvfs(path, stbuf); if (res == -1) return -errno; return 0; } static int xmp_release(const char *path, struct fuse_file_info *fi) { /* Just a stub. This method is optional and can safely be left unimplemented */ (void) path; (void) fi; return 0; } static int xmp_fsync(const char *path, int isdatasync, struct fuse_file_info *fi) { /* Just a stub. This method is optional and can safely be left unimplemented */ (void) path; (void) isdatasync; (void) fi; return 0; } #ifdef HAVE_SETXATTR /* xattr operations are optional and can safely be left unimplemented */ static int xmp_setxattr(const char *path, const char *name, const char *value, size_t size, int flags) { int res = lsetxattr(path, name, value, size, flags); if (res == -1) return -errno; return 0; } static int xmp_getxattr(const char *path, const char *name, char *value, size_t size) { int res = lgetxattr(path, name, value, size); if (res == -1) return -errno; return res; } static int xmp_listxattr(const char *path, char *list, size_t size) { int res = llistxattr(path, list, size); if (res == -1) return -errno; return res; } static int xmp_removexattr(const char *path, const char *name) { int res = lremovexattr(path, name); if (res == -1) return -errno; return 0; } #endif /* HAVE_SETXATTR */ static struct fuse_operations xmp_oper = { .getattr = xmp_getattr, .access = xmp_access, .readlink = xmp_readlink, .readdir = xmp_readdir, .mknod = xmp_mknod, .mkdir = xmp_mkdir, .symlink = xmp_symlink, .unlink = xmp_unlink, .rmdir = xmp_rmdir, .rename = xmp_rename, .link = xmp_link, .chmod = xmp_chmod, .chown = xmp_chown, .truncate = xmp_truncate, .utime = xmp_utime, .open = xmp_open, .read = xmp_read, .write = xmp_write, .statfs = xmp_statfs, .release = xmp_release, .fsync = xmp_fsync, #ifdef HAVE_SETXATTR .setxattr = xmp_setxattr, .getxattr = xmp_getxattr, .listxattr = xmp_listxattr, .removexattr= xmp_removexattr, #endif }; int main(int argc, char *argv[]) { umask(0); return fuse_main(argc, argv, &xmp_oper); }
-
Da solltest du dir mal die Definition von "struct fuse_operations" ansehen, welche Member es wirklich hat.
-
Sorry, ich hatte gerade noch einen Anruf und antworte deshalb erst jetzt.
u.a. in fuse.h :
struct fuse_operations { /** Get file attributes. * * Similar to stat(). The 'st_dev' and 'st_blksize' fields are * ignored. The 'st_ino' field is ignored except if the 'use_ino' * mount option is given. */ int (*getattr) (const char *, struct stat *); /** Read the target of a symbolic link * * The buffer should be filled with a null terminated string. The * buffer size argument includes the space for the terminating * null character. If the linkname is too long to fit in the * buffer, it should be truncated. The return value should be 0 * for success. */ int (*readlink) (const char *, char *, size_t); /* Deprecated, use readdir() instead */ int (*getdir) (const char *, fuse_dirh_t, fuse_dirfil_t); /** Create a file node * * There is no create() operation, mknod() will be called for * creation of all non-directory, non-symlink nodes. */ int (*mknod) (const char *, mode_t, dev_t); /** Create a directory */ int (*mkdir) (const char *, mode_t); /** Remove a file */ int (*unlink) (const char *); /** Remove a directory */ int (*rmdir) (const char *); /** Create a symbolic link */ int (*symlink) (const char *, const char *); /** Rename a file */ int (*rename) (const char *, const char *); /** Create a hard link to a file */ int (*link) (const char *, const char *); /** Change the permission bits of a file */ int (*chmod) (const char *, mode_t); /** Change the owner and group of a file */ int (*chown) (const char *, uid_t, gid_t); /** Change the size of a file */ int (*truncate) (const char *, off_t); /** Change the access and/or modification times of a file */ int (*utime) (const char *, struct utimbuf *); /** File open operation * * No creation, or truncation flags (O_CREAT, O_EXCL, O_TRUNC) * will be passed to open(). Open should check if the operation * is permitted for the given flags. Optionally open may also * return an arbitrary filehandle in the fuse_file_info structure, * which will be passed to all file operations. * * Changed in version 2.2 */ int (*open) (const char *, struct fuse_file_info *); /** Read data from an open file * * Read should return exactly the number of bytes requested except * on EOF or error, otherwise the rest of the data will be * substituted with zeroes. An exception to this is when the * 'direct_io' mount option is specified, in which case the return * value of the read system call will reflect the return value of * this operation. * * Changed in version 2.2 */ int (*read) (const char *, char *, size_t, off_t, struct fuse_file_info *); /** Write data to an open file * * Write should return exactly the number of bytes requested * except on error. An exception to this is when the 'direct_io' * mount option is specified (see read operation). * * Changed in version 2.2 */ int (*write) (const char *, const char *, size_t, off_t, struct fuse_file_info *); /** Just a placeholder, don't set */ /** Get file system statistics * * The 'f_frsize', 'f_favail', 'f_fsid' and 'f_flag' fields are ignored * * Replaced 'struct statfs' parameter with 'struct statvfs' in * version 2.5 */ int (*statfs) (const char *, struct statvfs *); /** Possibly flush cached data * * BIG NOTE: This is not equivalent to fsync(). It's not a * request to sync dirty data. * * Flush is called on each close() of a file descriptor. So if a * filesystem wants to return write errors in close() and the file * has cached dirty data, this is a good place to write back data * and return any errors. Since many applications ignore close() * errors this is not always useful. * * NOTE: The flush() method may be called more than once for each * open(). This happens if more than one file descriptor refers * to an opened file due to dup(), dup2() or fork() calls. It is * not possible to determine if a flush is final, so each flush * should be treated equally. Multiple write-flush sequences are * relatively rare, so this shouldn't be a problem. * * Filesystems shouldn't assume that flush will always be called * after some writes, or that if will be called at all. * * Changed in version 2.2 */ int (*flush) (const char *, struct fuse_file_info *); /** Release an open file * * Release is called when there are no more references to an open * file: all file descriptors are closed and all memory mappings * are unmapped. * * For every open() call there will be exactly one release() call * with the same flags and file descriptor. It is possible to * have a file opened more than once, in which case only the last * release will mean, that no more reads/writes will happen on the * file. The return value of release is ignored. * * Changed in version 2.2 */ int (*release) (const char *, struct fuse_file_info *); /** Synchronize file contents * * If the datasync parameter is non-zero, then only the user data * should be flushed, not the meta data. * * Changed in version 2.2 */ int (*fsync) (const char *, int, struct fuse_file_info *); /** Set extended attributes */ int (*setxattr) (const char *, const char *, const char *, size_t, int); /** Get extended attributes */ int (*getxattr) (const char *, const char *, char *, size_t); /** List extended attributes */ int (*listxattr) (const char *, char *, size_t); /** Remove extended attributes */ int (*removexattr) (const char *, const char *); /** Open directory * * This method should check if the open operation is permitted for * this directory * * Introduced in version 2.3 */ int (*opendir) (const char *, struct fuse_file_info *); /** Read directory * * This supersedes the old getdir() interface. New applications * should use this. * * The filesystem may choose between two modes of operation: * * 1) The readdir implementation ignores the offset parameter, and * passes zero to the filler function's offset. The filler * function will not return '1' (unless an error happens), so the * whole directory is read in a single readdir operation. This * works just like the old getdir() method. * * 2) The readdir implementation keeps track of the offsets of the * directory entries. It uses the offset parameter and always * passes non-zero offset to the filler function. When the buffer * is full (or an error happens) the filler function will return * '1'. * * Introduced in version 2.3 */ int (*readdir) (const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *); /** Release directory * * Introduced in version 2.3 */ int (*releasedir) (const char *, struct fuse_file_info *); /** Synchronize directory contents * * If the datasync parameter is non-zero, then only the user data * should be flushed, not the meta data * * Introduced in version 2.3 */ int (*fsyncdir) (const char *, int, struct fuse_file_info *); /** * Initialize filesystem * * The return value will passed in the private_data field of * fuse_context to all file operations and as a parameter to the * destroy() method. * * Introduced in version 2.3 */ void *(*init) (void); /** * Clean up filesystem * * Called on filesystem exit. * * Introduced in version 2.3 */ void (*destroy) (void *); /** * Check file access permissions * * This will be called for the access() system call. If the * 'default_permissions' mount option is given, this method is not * called. * * This method is not called under Linux kernel versions 2.4.x * * Introduced in version 2.5 */ int (*access) (const char *, int); /** * Create and open a file * * If the file does not exist, first create it with the specified * mode, and then open it. * * If this method is not implemented or under Linux kernel * versions earlier than 2.6.15, the mknod() and open() methods * will be called instead. * * Introduced in version 2.5 */ int (*create) (const char *, mode_t, struct fuse_file_info *); /** * Change the size of an open file * * This method is called instead of the truncate() method if the * truncation was invoked from an ftruncate() system call. * * If this method is not implemented or under Linux kernel * versions earlier than 2.6.15, the truncate() method will be * called instead. * * Introduced in version 2.5 */ int (*ftruncate) (const char *, off_t, struct fuse_file_info *); /** * Get attributes from an open file * * This method is called instead of the getattr() method if the * file information is available. * * Currently this is only called after the create() method if that * is implemented (see above). Later it may be called for * invocations of fstat() too. * * Introduced in version 2.5 */ int (*fgetattr) (const char *, struct stat *, struct fuse_file_info *); };Wie gesagt : Das sind die Original-Beispiele.
Könnte es noch an etwas anderem liegen ?edit :
Mich wundert noch die Anjuta-Nachricht
/usr/bin/create_global_tags.sh: 3:not found shift: 11:can't shift that manyobwohl die Datei da ist und schon auf rwxr-xr-x steht.
EDIT :
Ich habe die Lösung fürs Compilieren in einem Blog gefunden :
gcc -lfuse -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=25 hello.c -o helloDanke noch einmal für die Mühe !!!