1 files changed, 412 insertions, 0 deletions
diff --git a/draft/fuse-examples/fusexmp.c b/draft/fuse-examples/fusexmp.c
new file mode 100644
index 0000000..dca8a46
--- /dev/null
+++ b/draft/fuse-examples/fusexmp.c
@@ -0,0 +1,412 @@
+/*
+  FUSE: Filesystem in Userspace
+  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
+  Copyright (C) 2011       Sebastian Pipping <sebastian@pipping.org>
+
+  This program can be distributed under the terms of the GNU GPL.
+  See the file COPYING.
+
+  gcc -Wall fusexmp.c `pkg-config fuse --cflags --libs` -o fusexmp
+*/
+
+#define FUSE_USE_VERSION 26
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef linux
+/* For pread()/pwrite()/utimensat() */
+#define _XOPEN_SOURCE 700
+#endif
+
+#include <fuse.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/time.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;
+}
+
+#ifdef HAVE_UTIMENSAT
+static int xmp_utimens(const char *path, const struct timespec ts[2])
+{
+	int res;
+
+	/* don't use utime/utimes since they follow symlinks */
+	res = utimensat(0, path, ts, AT_SYMLINK_NOFOLLOW);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+#endif
+
+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_POSIX_FALLOCATE
+static int xmp_fallocate(const char *path, int mode,
+			off_t offset, off_t length, struct fuse_file_info *fi)
+{
+	int fd;
+	int res;
+
+	(void) fi;
+
+	if (mode)
+		return -EOPNOTSUPP;
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		return -errno;
+
+	res = -posix_fallocate(fd, offset, length);
+
+	close(fd);
+	return res;
+}
+#endif
+
+#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,
+#ifdef HAVE_UTIMENSAT
+	.utimens	= xmp_utimens,
+#endif
+	.open		= xmp_open,
+	.read		= xmp_read,
+	.write		= xmp_write,
+	.statfs		= xmp_statfs,
+	.release	= xmp_release,
+	.fsync		= xmp_fsync,
+#ifdef HAVE_POSIX_FALLOCATE
+	.fallocate	= xmp_fallocate,
+#endif
+#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, NULL);
+}