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study/kernel/process/create/kernel_thead/Makefile

@@ -0,0 +1,14 @@
+
+
+obj-m := kernel_thread.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
+

study/kernel/process/create/kernel_thead/kernel_thread.c

@@ -0,0 +1,81 @@
+/*************************************************************************
+    > 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>
+#include <linux/pid.h>
+
+
+
+//#define METHOD 2
+static unsigned int METHOD = 1;
+module_param(METHOD, uint,0400);
+
+static unsigned int PID = 1;
+module_param(PID, uint,0400);
+
+
+int kthread_function(void *argc)
+{
+    printk(KERN_ALERT "in the kernel thread function!\n");
+    return 0;
+}
+
+void print_kernel_thread_pid(void)
+{
+    pid_t               res = -1;
+    struct pid          *ktpid = NULL;
+    struct task_struct  *task = NULL;
+
+    //  create a kernel thread
+    res = kernel_thread(kthread_function, NULL, CLONE_KERNEL);
+
+    //  get the pid of the kernel thread you create
+    ktpid = find_get_pid(res);
+
+    //  get the task info of the kernel thread
+    task = pid_task(ktpid, PIDTYPE_PID);
+
+    printk(KERN_ALERT "the state of the task is : %ld\n", task->state);      //显示任务当前所处的状态
+
+    //  get the real PID of the kernel thread
+    printk(KERN_ALERT "the pid of the task is  :%d\n", task->pid);        //显示任务的进程号
+
+    //  get the thread id of the kernel thread
+    printk(KERN_ALERT "the tgid of the task is : %d\n", task->tgid);
+
+    //  显示函数kernel_thread( )函数执行结果
+    printk(KERN_ALERT "the kernel_thread result is : %d\n", res);
+    printk(KERN_ALERT "out pid_task_init.\n");
+
+}
+
+
+static int init_kernel_thread(void)
+{
+    print_kernel_thread_pid( );
+
+    return 0;
+}
+
+static void exit_kernel_thread(void)
+{
+    printk(KERN_ALERT "GOOD BYE:kernel_thread!!\n");
+}
+
+
+
+module_init(init_kernel_thread);
+module_exit(exit_kernel_thread);
+
+MODULE_AUTHOR("gatieme");
+MODULE_LICENSE("GPL");