From 768bd2a1c41bda1ee31364b3d83f1d064c5b42b4 Mon Sep 17 00:00:00 2001
From: gatieme <gatieme@163.com>
Date: Sat, 2 Apr 2016 19:54:51 +0800
Subject: [PATCH] =?UTF-8?q?=E9=81=8D=E5=8E=86=E7=B3=BB=E7=BB=9F=E4=B8=AD?=
 =?UTF-8?q?=E7=9A=84=E6=89=80=E6=9C=89=E8=BF=9B=E7=A8=8Blist=5Fprocess...?=
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---
 study/process/Makefile       |  14 +++++
 study/process/list_process.c | 107 +++++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 study/process/Makefile
 create mode 100644 study/process/list_process.c

diff --git a/study/process/Makefile b/study/process/Makefile
new file mode 100644
index 0000000..f1b0236
--- /dev/null
+++ b/study/process/Makefile
@@ -0,0 +1,14 @@
+
+
+obj-m := list_process.o
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+
diff --git a/study/process/list_process.c b/study/process/list_process.c
new file mode 100644
index 0000000..d6bfeb7
--- /dev/null
+++ b/study/process/list_process.c
@@ -0,0 +1,107 @@
+/*************************************************************************
+    > File Name: process.c
+    > Author: GatieMe
+    > Mail: gatieme@163.com
+    > Created Time: 2016年04月01日 星期五 21时09分29秒
+ ************************************************************************/
+
+
+
+#include <linux/init.h>
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched.h>
+
+
+
+//#define METHOD 2
+static unsigned int METHOD = 1;
+moudle_param(METHOD, uint,0400);
+
+static int list_process_init(void)
+{
+    struct task_struct *task, *p;
+    struct list_head *pos;
+    int count;
+    char *method;
+    count = 0; /*下面这些初始化完全是为了消除编译时的警告信息*/
+    p = 0;
+    task = 0;
+    pos = 0;
+    method = 0;
+    task = &init_task;
+
+    printk(KERN_ALERT"PID\tCOMM\n");
+
+    switch(METHOD)
+    {
+
+        case 1:
+
+            method = "list_for_each";
+
+            break;
+
+        case 2:
+
+            method = "for_each_process";
+
+            break;
+
+        case 3:
+
+            method = "list_for_each_entry";
+
+            break;
+
+    }
+
+    printk( "The method is %s\n", method );
+
+#if METHOD == 1
+
+    list_for_each( pos, &task->tasks )
+    {
+        p = list_entry( pos, struct task_struct, tasks );
+        count++;
+        printk( KERN_ALERT "%d\t%s\n", p->pid, p->comm );
+
+    }
+
+#elif METHOD == 2
+
+    for_each_process(task)
+    {
+        count++;
+        printk( KERN_ALERT "%d\t%s\n", task->pid, task->comm );
+    }
+
+#elif METHOD == 3
+
+    list_for_each_entry( p, &task->tasks, tasks )
+    {
+        count++;
+        printk( KERN_ALERT "%d\t%s\n", p->pid, p->comm );
+    }
+
+#endif
+
+    printk("there are %d process in your system now...", count);
+
+    return 0;
+}
+
+static void list_process_exit(void)
+{
+    printk( KERN_ALERT "GOOD BYE!!\n");
+}
+
+
+
+module_init(list_process_init);
+module_exit(list_process_exit);
+
+MODULE_AUTHOR("gatieme");
+MODULE_LICENSE("GPL");