*参照元 [#k17aa1f4] #backlinks *説明 [#d8e3276d] -パス: [[linux-2.6.33/fs/read_write.c]] -FIXME: これは何? --説明 **引数 [#ufe97c70] -struct file *file -- --[[linux-2.6.33/file]] -char __user *buf -- -size_t count -- -loff_t *pos -- **返り値 [#e47c2c45] -ssize_t -- **参考 [#r6ff4572] *実装 [#p0c75314] ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_READ)) return -EBADF; if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read)) return -EINVAL; if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) return -EFAULT; -file->f_op は file_operations 型 --[[linux-2.6.33/file_operations]] - --[[linux-2.6.33/access_ok()]] ret = rw_verify_area(READ, file, pos, count); - --[[linux-2.6.33/rw_verify_area()]] if (ret >= 0) { count = ret; if (file->f_op->read) ret = file->f_op->read(file, buf, count, pos); else ret = do_sync_read(file, buf, count, pos); - --[[linux-2.6.33/do_sync_read()]] if (ret > 0) { fsnotify_access(file->f_path.dentry); add_rchar(current, ret); } - --[[linux-2.6.33/fsnotify_access()]] - --[[linux-2.6.33/add_rchar()]] inc_syscr(current); - --[[linux-2.6.33/inc_syscr()]] } return ret; } EXPORT_SYMBOL(vfs_read); *コメント [#w59631ab]