多层嵌套的结构体如何初始化?

[boluor1987]

在写一个模块时,发现一个函数的参数是一个结构体A。结构体A中有很多成员,包括结构体B,C,D,枚举成员E,F,整形G.而结构体B,C,D又包含一些结构体.请问,现在想给结构体A初始化,应该怎么写?有没有类似memset之类的函数,可以不必考虑那么多.
谢谢!

[rzsheng]

memset(&A, 0, sizeof(A));

可以将结构体内的所有变量置0，
如果结构体里面是结构体，那么这个结构体内部的变量也被置0

内部成员是结构体指针变量，那么这个指针也将被置NULL。

[boluor1987]

类似这样的结构体.是内核模块阿.memset这样初始化可以吗?应该不可以吧.

struct dentry {
	atomic_t d_count;
	unsigned int d_flags;		/* protected by d_lock */
	spinlock_t d_lock;		/* per dentry lock */
	struct inode *d_inode;		/* Where the name belongs to - NULL is
					 * negative */
	/*
	 * The next three fields are touched by __d_lookup.  Place them here
	 * so they all fit in a cache line.
	 */
	struct hlist_node d_hash;	/* lookup hash list */
	struct dentry *d_parent;	/* parent directory */
	struct qstr d_name;

	struct list_head d_lru;		/* LRU list */
	/*
	 * d_child and d_rcu can share memory
	 */
	union {
		struct list_head d_child;	/* child of parent list */
	 	struct rcu_head d_rcu;
	} d_u;
	struct list_head d_subdirs;	/* our children */
	struct list_head d_alias;	/* inode alias list */
	unsigned long d_time;		/* used by d_revalidate */
	struct dentry_operations *d_op;
	struct super_block *d_sb;	/* The root of the dentry tree */
	void *d_fsdata;			/* fs-specific data */
#ifdef CONFIG_PROFILING
	struct dcookie_struct *d_cookie; /* cookie, if any */
#endif
	int d_mounted;
	unsigned char d_iname[DNAME_INLINE_LEN_MIN];	/* small names */
};

struct vfsmount {
	struct list_head mnt_hash;
	struct vfsmount *mnt_parent;	/* fs we are mounted on */
	struct dentry *mnt_mountpoint;	/* dentry of mountpoint */
	struct dentry *mnt_root;	/* root of the mounted tree */
	struct super_block *mnt_sb;	/* pointer to superblock */
	struct list_head mnt_mounts;	/* list of children, anchored here */
	struct list_head mnt_child;	/* and going through their mnt_child */
	int mnt_flags;
	/* 4 bytes hole on 64bits arches */
	const char *mnt_devname;	/* Name of device e.g. /dev/dsk/hda1 */
	struct list_head mnt_list;
	struct list_head mnt_expire;	/* link in fs-specific expiry list */
	struct list_head mnt_share;	/* circular list of shared mounts */
	struct list_head mnt_slave_list;/* list of slave mounts */
	struct list_head mnt_slave;	/* slave list entry */
	struct vfsmount *mnt_master;	/* slave is on master->mnt_slave_list */
	struct mnt_namespace *mnt_ns;	/* containing namespace */
	int mnt_id;			/* mount identifier */
	int mnt_group_id;		/* peer group identifier */
	/*
	 * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
	 * to let these frequently modified fields in a separate cache line
	 * (so that reads of mnt_flags wont ping-pong on SMP machines)
	 */
	atomic_t mnt_count;
	int mnt_expiry_mark;		/* true if marked for expiry */
	int mnt_pinned;
	int mnt_ghosts;
	/*
	 * This value is not stable unless all of the mnt_writers[] spinlocks
	 * are held, and all mnt_writer[]s on this mount have 0 as their ->count
	 */
	atomic_t __mnt_writers;
};

[cnzdgs]

要先了解每个成员的含义和用法才行。

[boluor1987]

这到猴年马月了阿...郁闷.

[llKK0616]

有点耐心，做技术哪有那么容易。

[bxhzct]

好贴,结构体,很深啊

[paul_chao]

memset(&A, 0, sizeof(A));

不知是不是您要的.

Paul, Chao @ Techware.

[zzg_samsung]

给每个内部结构体,各写一个初始化函数

[Heaven_Redsky]

LZ这个结构体也不是很大嘛
仔细看一下 结合应用也就半个小时就能搞明白了
想做明白没有耐心是不行的

[boluor1987]

恩.现在在研究linux下的redirFS.这种访问技术感觉蛮有前途,就是搞这个的人太少了.遇到问题没个讨论的.

[boluor1987]

恩.现在在研究redirFS.感觉这个比较有前景，但是研究的人太少了，讨论的人不多。