linux-1.2.13linux etinetsock.h 文件中定义了sock和 proto两个结构体：
#define SOCK_ARRAY_SIZE 256 /* Think big (also on some systems a byte is faster */ /* * This structure really needs to be cleaned up. * Most of it is for TCP, and not used by any of * the other protocols. */ struct sock { struct options *opt; volatile unsigned long wmem_alloc; volatile unsigned long rmem_alloc; unsigned long write_seq; unsigned long sent_seq; unsigned long acked_seq; unsigned long copied_seq; unsigned long rcv_ack_seq; unsigned long window_seq; unsigned long fin_seq; unsigned long urg_seq; unsigned long urg_data; /* * Not all are volatile, but some are, so we * might as well say they all are. */ volatile char inuse, dead, urginline, intr, blog, done, reuse, keepopen, linger, delay_acks, destroy, ack_timed, no_check, zapped, /* In ax25 & ipx means not linked */ broadcast, nonagle; unsigned long lingertime; int proc; struct sock *next; struct sock *prev; /* Doubly linked chain.. */ struct sock *pair; struct sk_buff * volatile send_head; struct sk_buff * volatile send_tail; struct sk_buff_head back_log; struct sk_buff *partial; struct timer_list partial_timer; long retransmits; struct sk_buff_head write_queue, receive_queue; struct proto *prot; struct wait_queue **sleep; unsigned long daddr; unsigned long saddr; unsigned short max_unacked; unsigned short window; unsigned short bytes_rcv; /* mss is min(mtu, max_window) */ unsigned short mtu; /* mss negotiated in the syn's */ volatile unsigned short mss; /* current eff. mss - can change */ volatile unsigned short user_mss; /* mss requested by user in ioctl */ volatile unsigned short max_window; unsigned long window_clamp; unsigned short num; volatile unsigned short cong_window; volatile unsigned short cong_count; volatile unsigned short ssthresh; volatile unsigned short packets_out; volatile unsigned short shutdown; volatile unsigned long rtt; volatile unsigned long mdev; volatile unsigned long rto; /* currently backoff isn't used, but I'm maintaining it in case * we want to go back to a backoff formula that needs it */ volatile unsigned short backoff; volatile short err; unsigned char protocol; volatile unsigned char state; volatile unsigned char ack_backlog; unsigned char max_ack_backlog; unsigned char priority; unsigned char debug; unsigned short rcvbuf; unsigned short sndbuf; unsigned short type; unsigned char localroute; /* Route locally only */ #ifdef CONFIG_IPX ipx_address ipx_dest_addr; ipx_interface *ipx_intrfc; unsigned short ipx_port; unsigned short ipx_type; #endif #ifdef CONFIG_AX25 /* Really we want to add a per protocol private area */ ax25_address ax25_source_addr,ax25_dest_addr; struct sk_buff *volatile ax25_retxq[8]; char ax25_state,ax25_vs,ax25_vr,ax25_lastrxnr,ax25_lasttxnr; char ax25_condition; char ax25_retxcnt; char ax25_xx; char ax25_retxqi; char ax25_rrtimer; char ax25_timer; unsigned char ax25_n2; unsigned short ax25_t1,ax25_t2,ax25_t3; ax25_digi *ax25_digipeat; #endif #ifdef CONFIG_ATALK struct atalk_sock at; #endif /* IP 'private area' or will be eventually */ int ip_ttl; /* TTL setting */ int ip_tos; /* TOS */ struct tcphdr dummy_th; struct timer_list keepalive_timer; /* TCP keepalive hack */ struct timer_list retransmit_timer; /* TCP retransmit timer */ struct timer_list ack_timer; /* TCP delayed ack timer */ int ip_xmit_timeout; /* Why the timeout is running */ #ifdef CONFIG_IP_MULTICAST int ip_mc_ttl; /* Multicasting TTL */ int ip_mc_loop; /* Loopback (not implemented yet) */ char ip_mc_name[MAX_ADDR_LEN]; /* Multicast device name */ struct ip_mc_socklist *ip_mc_list; /* Group array */ #endif /* This part is used for the timeout functions (timer.c). */ int timeout; /* What are we waiting for? */ struct timer_list timer; /* This is the TIME_WAIT/receive timer when we are doing IP */ struct timeval stamp; /* identd */ struct socket *socket; /* Callbacks */ void (*state_change)(struct sock *sk); void (*data_ready)(struct sock *sk,int bytes); void (*write_space)(struct sock *sk); void (*error_report)(struct sock *sk); }; struct proto { struct sk_buff * (*wmalloc)(struct sock *sk, unsigned long size, int force, int priority); struct sk_buff * (*rmalloc)(struct sock *sk, unsigned long size, int force, int priority); void (*wfree)(struct sock *sk, struct sk_buff *skb, unsigned long size); void (*rfree)(struct sock *sk, struct sk_buff *skb, unsigned long size); unsigned long (*rspace)(struct sock *sk); unsigned long (*wspace)(struct sock *sk); void (*close)(struct sock *sk, int timeout); int (*read)(struct sock *sk, unsigned char *to, int len, int nonblock, unsigned flags); int (*write)(struct sock *sk, unsigned char *to, int len, int nonblock, unsigned flags); int (*sendto)(struct sock *sk, unsigned char *from, int len, int noblock, unsigned flags, struct sockaddr_in *usin, int addr_len); int (*recvfrom)(struct sock *sk, unsigned char *from, int len, int noblock, unsigned flags, struct sockaddr_in *usin, int *addr_len); int (*build_header)(struct sk_buff *skb, unsigned long saddr, unsigned long daddr, struct device **dev, int type, struct options *opt, int len, int tos, int ttl); int (*connect)(struct sock *sk, struct sockaddr_in *usin, int addr_len); struct sock * (*accept) (struct sock *sk, int flags); void (*queue_xmit)(struct sock *sk, struct device *dev, struct sk_buff *skb, int free); void (*retransmit)(struct sock *sk, int all); void (*write_wakeup)(struct sock *sk); void (*read_wakeup)(struct sock *sk); int (*rcv)(struct sk_buff *buff, struct device *dev, struct options *opt, unsigned long daddr, unsigned short len, unsigned long saddr, int redo, struct inet_protocol *protocol); int (*select)(struct sock *sk, int which, select_table *wait); int (*ioctl)(struct sock *sk, int cmd, unsigned long arg); int (*init)(struct sock *sk); void (*shutdown)(struct sock *sk, int how); int (*setsockopt)(struct sock *sk, int level, int optname, char *optval, int optlen); int (*getsockopt)(struct sock *sk, int level, int optname, char *optval, int *option); unsigned short max_header; unsigned long retransmits; struct sock * sock_array[SOCK_ARRAY_SIZE]; char name[80]; int inuse, highestinuse; };
linux-1.2.13linuxincludelinux et.h 定义了socket和proto_ops两个结构体
struct socket { short type; /* SOCK_STREAM, ... */ socket_state state; long flags; struct proto_ops *ops; /* protocols do most everything */ void *data; /* protocol data */ struct socket *conn; /* server socket connected to */ struct socket *iconn; /* incomplete client conn.s */ struct socket *next; struct wait_queue **wait; /* ptr to place to wait on */ struct inode *inode; struct fasync_struct *fasync_list; /* Asynchronous wake up list */ }; #define SOCK_INODE(S) ((S)->inode) struct proto_ops { int family; int (*create) (struct socket *sock, int protocol); int (*dup) (struct socket *newsock, struct socket *oldsock); int (*release) (struct socket *sock, struct socket *peer); int (*bind) (struct socket *sock, struct sockaddr *umyaddr, int sockaddr_len); int (*connect) (struct socket *sock, struct sockaddr *uservaddr, int sockaddr_len, int flags); int (*socketpair) (struct socket *sock1, struct socket *sock2); int (*accept) (struct socket *sock, struct socket *newsock, int flags); int (*getname) (struct socket *sock, struct sockaddr *uaddr, int *usockaddr_len, int peer); int (*read) (struct socket *sock, char *ubuf, int size, int nonblock); int (*write) (struct socket *sock, char *ubuf, int size, int nonblock); int (*select) (struct socket *sock, int sel_type, select_table *wait); int (*ioctl) (struct socket *sock, unsigned int cmd, unsigned long arg); int (*listen) (struct socket *sock, int len); int (*send) (struct socket *sock, void *buff, int len, int nonblock, unsigned flags); int (*recv) (struct socket *sock, void *buff, int len, int nonblock, unsigned flags); int (*sendto) (struct socket *sock, void *buff, int len, int nonblock, unsigned flags, struct sockaddr *, int addr_len); int (*recvfrom) (struct socket *sock, void *buff, int len, int nonblock, unsigned flags, struct sockaddr *, int *addr_len); int (*shutdown) (struct socket *sock, int flags); int (*setsockopt) (struct socket *sock, int level, int optname, char *optval, int optlen); int (*getsockopt) (struct socket *sock, int level, int optname, char *optval, int *optlen); int (*fcntl) (struct socket *sock, unsigned int cmd, unsigned long arg); };
linux-1.2.13linuxincludelinuxfs.h 文件定义 inode 和 file 结构体
struct inode { dev_t i_dev; unsigned long i_ino; umode_t i_mode; nlink_t i_nlink; uid_t i_uid; gid_t i_gid; dev_t i_rdev; off_t i_size; time_t i_atime; time_t i_mtime; time_t i_ctime; unsigned long i_blksize; unsigned long i_blocks; unsigned long i_version; struct semaphore i_sem; struct inode_operations * i_op; struct super_block * i_sb; struct wait_queue * i_wait; struct file_lock * i_flock; struct vm_area_struct * i_mmap; struct inode * i_next, * i_prev; struct inode * i_hash_next, * i_hash_prev; struct inode * i_bound_to, * i_bound_by; struct inode * i_mount; unsigned short i_count; unsigned short i_wcount; unsigned short i_flags; unsigned char i_lock; unsigned char i_dirt; unsigned char i_pipe; unsigned char i_sock; unsigned char i_seek; unsigned char i_update; union { struct pipe_inode_info pipe_i; struct minix_inode_info minix_i; struct ext_inode_info ext_i; struct ext2_inode_info ext2_i; struct hpfs_inode_info hpfs_i; struct msdos_inode_info msdos_i; struct umsdos_inode_info umsdos_i; struct iso_inode_info isofs_i; struct nfs_inode_info nfs_i; struct xiafs_inode_info xiafs_i; struct sysv_inode_info sysv_i; struct socket socket_i; void * generic_ip; } u; }; struct file { mode_t f_mode; loff_t f_pos; unsigned short f_flags; unsigned short f_count; off_t f_reada; struct file *f_next, *f_prev; int f_owner; /* pid or -pgrp where SIGIO should be sent */ struct inode * f_inode; struct file_operations * f_op; unsigned long f_version; void *private_data; /* needed for tty driver, and maybe others */ };