在阅读内核碰到结构体的点号和冒号"."and":"

C99(c语言标准)用点号。linux kernel 中的冒号是gcc的扩展。.a表示结构体Str的成员，用来初始化。当结构体里有很多成员的话，这样会方便和清晰很多 int main() {Str s ={.a = 1,.b = 2};//注意这里的点printf("a=%d/nb=%d/

lufeiop02

2775人浏览 · 2011-06-09 16:33:00

lufeiop02 · 2011-06-09 16:33:00 发布

C99(c语言标准)用点号。linux kernel 中的冒号是gcc的扩展。

.a表示结构体Str的成员，用来初始化。

当结构体里有很多成员的话，这样会方便和清晰很多

原文是在linux内核2.4.18的linux/fs/ext2/super.c文件里的，如下：
冒号的作用应该是和点号一样

static struct super_operations ext2_sops = { read_inode: ext2_read_inode, write_inode: ext2_write_inode, put_inode: ext2_put_inode, delete_inode:ext2_delete_inode, put_super: ext2_put_super, write_super: ext2_write_super, statfs: ext2_statfs, remount_fs: ext2_remount, };

super_operations的定义在linux/include/linux/fs.h文件中，原文为：

struct super_operations {
    void (*read_inode) (struct inode *);

/* reiserfs kludge.  reiserfs needs 64 bits of information to
    ** find an inode.  We are using the read_inode2 call to get
    ** that information.  We don't like this, and are waiting on some
    ** VFS changes for the real solution.
    ** iget4 calls read_inode2, iff it is defined
    */
    void (*read_inode2) (struct inode *, void *) ;
    void (*dirty_inode) (struct inode *);
    void (*write_inode) (struct inode *, int);
    void (*put_inode) (struct inode *);
    void (*delete_inode) (struct inode *);
    void (*put_super) (struct super_block *);
    void (*write_super) (struct super_block *);
    void (*write_super_lockfs) (struct super_block *);
    void (*unlockfs) (struct super_block *);
    int (*statfs) (struct super_block *, struct statfs *);
    int (*remount_fs) (struct super_block *, int *, char *);
    void (*clear_inode) (struct inode *);
    void (*umount_begin) (struct super_block *);

/* Following are for knfsd to interact with "interesting" filesystems
     * Currently just reiserfs, but possibly FAT and others later
     *
     * fh_to_dentry is given a filehandle fragement with length, and a type flag
     *   and must return a dentry for the referenced object or, if "parent" is
     *   set, a dentry for the parent of the object.
     *   If a dentry cannot be found, a "root" dentry should be created and
     *   flaged as DCACHE_NFSD_DISCONNECTED. nfsd_iget is an example implementation.
     *
     * dentry_to_fh is given a dentry and must generate the filesys  specific
     *   part of the file handle.  Available length is passed in *lenp  and used
     *   length should be returned therein.
     *   If need_parent is set, then dentry_to_fh should encode  sufficient information
     *   to find the (current) parent.
     *   dentry_to_fh should return a 1byte "type" which will be passed  back in
     *   the fhtype arguement to fh_to_dentry.  Type of 0 is reserved.
     *   If filesystem was exportable before the introduction of  fh_to_dentry,
     *   types 1 and 2 should be used is that same way as the generic  code.
     *   Type 255 means error.
     *
     * Lengths are in units of 4bytes, not bytes.
     */
    struct dentry * (*fh_to_dentry)(struct super_block *sb, __u32 *fh,  int len, int fhtype, int parent);
    int (*dentry_to_fh)(struct dentry *, __u32 *fh, int *lenp, int  need_parent);
    int (*show_options)(struct seq_file *, struct vfsmount *);
};

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