Linux中list.h中函数应用实例

这些代码片段展示如何使用Linux内核模块，list，以及hash===================tccounter.c=====================#include <linux/init.h>#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/list.h>#include <linux/jhash.h>#include <linux/ctype.h>#include <linux/proc_fs.h>#include <asm/uaccess.h>MODULE_LICENSE（"GPL"）;static unsigned int ip = 123456789;module_param（ip, uint, 0）;static unsigned int port = 1;module_param（port, uint, 0）;#define TCCOUNT_SIZE 255struct tccount{ struct list_head list; unsigned int ip; unsigned short port; unsigned short counter;};struct tccount tclist[TCCOUNT_SIZE];unsigned int gethash（unsigned int ip, unsigned int port）{ return jhash_2words（ip, port, 4）%TCCOUNT_SIZE;}int tccount_init（void）{ int i; for（i = 0; i < TCCOUNT_SIZE; i++ ） { INIT_LIST_HEAD（&（tclist[i].list））; tclist[i].ip = 0; tclist[i].port = 0; tclist[i].counter = 0; } return 0;}int addNewStream（unsigned int sip, unsigned int sport）{ unsigned int hash; struct tccount *stream; hash = gethash（sip, sport）; list_for_each_entry（stream, &（tclist[hash].list）, list） { if（stream && stream->ip == sip && stream->port == sport） { stream->counter++; return 0; } } stream = kmalloc（sizeof（struct tccount）, GFP_KERNEL）; stream->ip = sip; stream->port = sport; stream->counter = 1; list_add_rcu（&（stream->list）, &（tclist[hash].list））; return 0;}int delStream（unsigned int sip, unsigned int sport）{ unsigned int hash; struct tccount *stream; hash = gethash（sip, sport）; list_for_each_entry（stream, &（tclist[hash].list）, list） { if（stream->ip == sip && stream->port == sport） { stream->counter--; if（stream->counter == 0 && stream ！= &tclist[hash]） { list_del_rcu（&（stream->list））; kfree（&stream）; } } } return 0;}unsigned short getStreamCount（unsigned int sip, unsigned int sport）{ unsigned int hash; struct tccount *stream; hash = gethash（sip, sport）; list_for_each_entry（stream, &（tclist[hash].list）, list） { if（stream->ip == sip && stream->port == sport） return stream->counter; } return 0;}/*debug proc*/static int proc_show_tccount（struct file *f, const char *buf, unsigned long cnt, void *data）{ char input[32]; int r; unsigned int ip; unsigned int port; unsigned short count; if （copy_from_user（input, buf, cnt）！= 0） return -EFAULT; r = cnt;
sscanf（input, "%u %u", &ip, &port） ; count = getStreamCount（ip, port）; printk（KERN_ALERT "（%d, %d） counter:%u/n",ip, port, count）; return cnt;}static int proc_set_tccount（struct file *f, const char *buf, unsigned long cnt, void *data）{ char input[32]; int r; unsigned int ip; unsigned int port; unsigned int count; if （copy_from_user（input, buf, cnt）！= 0） return -EFAULT; r = cnt; sscanf（input, "%u %u", &ip, &port） ; count = addNewStream（ip, port）; printk（KERN_ALERT "（%d, %d） has been added/n", ip, port）; return cnt;}static int proc_del_tccount（struct file *f, const char *buf, unsigned long cnt, void *data）{ char input[32]; int r; unsigned int ip; unsigned int port; unsigned int count; if （copy_from_user（input, buf, cnt）！= 0） return -EFAULT; r = cnt; sscanf（input, "%u %u", &ip, &port） ; count = delStream（ip, port）; printk（KERN_ALERT "a stream of （%d, %d） has been deleted/n", ip, port）; return cnt;}static int proc_add（void）{ char tmp[32]; struct proc_dir_entry *proc_tcctl, *pentry; sprintf（tmp, "tccount"）; proc_tcctl = proc_mkdir（tmp, NULL）; sprintf（tmp, "show"）; pentry = create_proc_entry（tmp, 0644, proc_tcctl）; pentry->data = NULL; pentry->read_proc = NULL; pentry->write_proc = proc_show_tccount; pentry->owner = THIS_MODULE; sprintf（tmp, "del"）; pentry = create_proc_entry（tmp, 0644, proc_tcctl）; pentry->data = NULL; pentry->read_proc = NULL; pentry->write_proc = proc_del_tccount; pentry->owner = THIS_MODULE; sprintf（tmp, "add"）; pentry = create_proc_entry（tmp, 0644, proc_tcctl）; pentry->data = NULL; pentry->read_proc = NULL; pentry->write_proc = proc_set_tccount; pentry->owner = THIS_MODULE; return 0;}static int hello_init（void）{ tccount_init（）; proc_add（）; return 0;}static void hello_exit（void）{ printk（"Goodbye！/n"）;}module_init（hello_init）;module_exit（hello_exit）;

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