中财网舌头起泡怎么回事:内核模块遍历进程--内核PS - ldd学习笔记 - ubuntuer zone
来源：百度文库 编辑：中财网 时间：2024/04/28 07:08:27
内核模块遍历进程--内核PS 让我们先来看看一个重要的结构体吧...struct task_struct 自己用sourceinsight看下在linux\sched.h里... pid parent->pid comm就是我们要的pid ppid cmd
注意当你添加了linux\sched.h后就有个current给你使用了,也是struct task_struct的...可以打印自身的pid cmd等
pid.c
#include
#include
#include
#include
#include
MODULE_LICENSE("GPL");
MODULE_AUTHOR("kenthy@163.com");
static int ps_read(char *page, char **start, off_t offset,int count, int *eof, void *data)
{
static char buf[1024*8]={0};
char tmp[128];
struct task_struct *p;
if(offset >0)
return 0;
memset(buf,0,sizeof(buf));
read_lock(&tasklist_lock);
for_each_process(p)
{
sprintf(tmp,"%d\t\t%d\t\t\t%s\n",p->pid,p->parent->pid,p->comm);
strcat(buf,tmp);
memset(tmp,0,sizeof(tmp));
}
read_unlock(&tasklist_lock);
*start=buf;
return strlen(buf);
}
static __init int ps_init(void)
{
struct proc_dir_entry *entry;
entry = create_proc_entry("_ps", 0444, &proc_root);
if(entry == 0)
{
printk(KERN_ERR "create_proc_entry failed!\n");
return -1;
}
entry->mode = S_IFREG | 0444;
entry->size = 0;
entry->read_proc = ps_read;
printk("%d, %d, %s\n", current->pid, current->parent->pid, current->comm);
return 0;
}
static __exit void ps_cleanup(void)
{
remove_proc_entry("_ps", &proc_root);
}
module_init(ps_init);
module_exit(ps_cleanup);
user.c
#include
#include
int main()
{
FILE *fp;
char buf[1024];
fp=fopen("/proc/_ps","r");
if(fp==NULL)
{
perror("fopen");
return -1;
}
printf("pid\t\tppid\t\t\tcommand\n");
while(!feof(fp))
{
if(fgets(buf,sizeof(buf),fp)!=NULL)
printf("%s",buf);
}
fclose(fp);
return 0;
}
Makefile:
obj-m := pid.o
KDIR := /lib/modules/$(shell uname -r)/build/
PWD := $(shell pwd)
all:module
module:
$(MAKE) -C $(KDIR) M=$(PWD) modules
clean:
rm -rf *.ko *.mod.c *.o Module.* modules.* .*.cmd .tmp_versions
可以对ps_read做如下改进
static int ps_read(char *page, char **start, off_t off,int count, int *eof, void *data)
{
int len = 0;
struct task_struct *p;
read_lock(&tasklist_lock);
for_each_process(p)
len += sprintf(page+len,"%d\t\t%d\t\t\t%s\n",p->pid,p->parent->pid,p->comm);
read_unlock(&tasklist_lock);
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
for_each_process(p)遍历每一个进程
还可以用seq写个
#include
#include
#include //proc_fs
#include //seq_file
#include //struct file,struct inode
#include //next_task()
MODULE_AUTHOR("xunil@bmy");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("a test module utilise the seq_file mechanism");
static void *ps_seq_start(struct seq_file *s,loff_t *pos){
struct task_struct *task;
seq_printf(s,"%s\t%s\t%s\t%s\t%s\n","pid","ppid","uid","gid","comm");
if(*pos>0)
return NULL;
else{
task=next_task(current);
return task;
}
}
static void *ps_seq_next(struct seq_file *s,void *v,loff_t *pos){
struct task_struct *task=(struct task_struct *)v;
++*pos;
if(task->pid== current->pid){
return NULL;
}else{
task=next_task(task);
return task;
}
}
static void ps_seq_stop(struct seq_file *s,void *v){}
static int ps_seq_show(struct seq_file *s,void *v){
rwlock_t lock = RW_LOCK_UNLOCKED;
struct task_struct *task=(struct task_struct *)v;
read_lock(&lock);
seq_printf(s,"%d\t%d\t%d\t%d\t%s\n",task->pid,task->parent->pid,task->uid,task->gid,task->comm);
read_unlock(&lock);
return 0;
}
static struct seq_operations ps_seq_ops = {
.start = ps_seq_start,
.next = ps_seq_next,
.stop = ps_seq_stop,
.show = ps_seq_show
};
static int ps_open(struct inode *inode,struct file *file){
return seq_open(file,&ps_seq_ops);
}
static struct file_operations ps_file_ops = {
.owner = THIS_MODULE,
.open = ps_open,
.read = seq_read,
.llseek = seq_lseek,
.release= seq_release
};
static int __init ps_init(void){
struct proc_dir_entry *entry;
entry = create_proc_entry("myps",0,NULL);
if(entry)
entry->proc_fops = &ps_file_ops;
return 0;
}
static void __exit ps_exit(void){
remove_proc_entry("myps",NULL);
}
module_init(ps_init);
module_exit(ps_exit);
发表于： 2009-12-30，修改于： 2009-12-30 12:49 已浏览174次，有评论0条推荐投诉
注意当你添加了linux\sched.h后就有个current给你使用了,也是struct task_struct的...可以打印自身的pid cmd等
pid.c
#include
#include
#include
#include
#include
MODULE_LICENSE("GPL");
MODULE_AUTHOR("kenthy@163.com");
static int ps_read(char *page, char **start, off_t offset,int count, int *eof, void *data)
{
static char buf[1024*8]={0};
char tmp[128];
struct task_struct *p;
if(offset >0)
return 0;
memset(buf,0,sizeof(buf));
read_lock(&tasklist_lock);
for_each_process(p)
{
sprintf(tmp,"%d\t\t%d\t\t\t%s\n",p->pid,p->parent->pid,p->comm);
strcat(buf,tmp);
memset(tmp,0,sizeof(tmp));
}
read_unlock(&tasklist_lock);
*start=buf;
return strlen(buf);
}
static __init int ps_init(void)
{
struct proc_dir_entry *entry;
entry = create_proc_entry("_ps", 0444, &proc_root);
if(entry == 0)
{
printk(KERN_ERR "create_proc_entry failed!\n");
return -1;
}
entry->mode = S_IFREG | 0444;
entry->size = 0;
entry->read_proc = ps_read;
printk("%d, %d, %s\n", current->pid, current->parent->pid, current->comm);
return 0;
}
static __exit void ps_cleanup(void)
{
remove_proc_entry("_ps", &proc_root);
}
module_init(ps_init);
module_exit(ps_cleanup);
user.c
#include
#include
int main()
{
FILE *fp;
char buf[1024];
fp=fopen("/proc/_ps","r");
if(fp==NULL)
{
perror("fopen");
return -1;
}
printf("pid\t\tppid\t\t\tcommand\n");
while(!feof(fp))
{
if(fgets(buf,sizeof(buf),fp)!=NULL)
printf("%s",buf);
}
fclose(fp);
return 0;
}
Makefile:
obj-m := pid.o
KDIR := /lib/modules/$(shell uname -r)/build/
PWD := $(shell pwd)
all:module
module:
$(MAKE) -C $(KDIR) M=$(PWD) modules
clean:
rm -rf *.ko *.mod.c *.o Module.* modules.* .*.cmd .tmp_versions
可以对ps_read做如下改进
static int ps_read(char *page, char **start, off_t off,int count, int *eof, void *data)
{
int len = 0;
struct task_struct *p;
read_lock(&tasklist_lock);
for_each_process(p)
len += sprintf(page+len,"%d\t\t%d\t\t\t%s\n",p->pid,p->parent->pid,p->comm);
read_unlock(&tasklist_lock);
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
for_each_process(p)遍历每一个进程
还可以用seq写个
#include
#include
#include
#include
#include
#include
MODULE_AUTHOR("xunil@bmy");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("a test module utilise the seq_file mechanism");
static void *ps_seq_start(struct seq_file *s,loff_t *pos){
struct task_struct *task;
seq_printf(s,"%s\t%s\t%s\t%s\t%s\n","pid","ppid","uid","gid","comm");
if(*pos>0)
return NULL;
else{
task=next_task(current);
return task;
}
}
static void *ps_seq_next(struct seq_file *s,void *v,loff_t *pos){
struct task_struct *task=(struct task_struct *)v;
++*pos;
if(task->pid== current->pid){
return NULL;
}else{
task=next_task(task);
return task;
}
}
static void ps_seq_stop(struct seq_file *s,void *v){}
static int ps_seq_show(struct seq_file *s,void *v){
rwlock_t lock = RW_LOCK_UNLOCKED;
struct task_struct *task=(struct task_struct *)v;
read_lock(&lock);
seq_printf(s,"%d\t%d\t%d\t%d\t%s\n",task->pid,task->parent->pid,task->uid,task->gid,task->comm);
read_unlock(&lock);
return 0;
}
static struct seq_operations ps_seq_ops = {
.start = ps_seq_start,
.next = ps_seq_next,
.stop = ps_seq_stop,
.show = ps_seq_show
};
static int ps_open(struct inode *inode,struct file *file){
return seq_open(file,&ps_seq_ops);
}
static struct file_operations ps_file_ops = {
.owner = THIS_MODULE,
.open = ps_open,
.read = seq_read,
.llseek = seq_lseek,
.release= seq_release
};
static int __init ps_init(void){
struct proc_dir_entry *entry;
entry = create_proc_entry("myps",0,NULL);
if(entry)
entry->proc_fops = &ps_file_ops;
return 0;
}
static void __exit ps_exit(void){
remove_proc_entry("myps",NULL);
}
module_init(ps_init);
module_exit(ps_exit);
发表于： 2009-12-30，修改于： 2009-12-30 12:49 已浏览174次，有评论0条推荐投诉
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