内核编写

<pre name="code" class="plain">TARGET=print_process_infoKDIR=/lib/modules/$(shell uname -r)/buildobj-m+=$(TARGET).odefault:make -C $(KDIR) M=$(PWD) modules#ifneq ($(KERNELRELEASE),)#obj-m := hello.o#else#KERNELDIR ?= /lib/modules/$(shell uname -r) /build#PWD := $(shell pwd)#default:#(MAKE)−C(KERNELDIR) M=$(PWD) modules#endif

#include <linux/module.h>#include <linux/sched.h>//#include <linux/kernel.h>#define TASK_ZOMBIE 4int init_module(void){struct task_struct *task;int num_running, num_int, num_unint, num_zombie, num_stopped, num_process;num_process = num_running = num_int = num_unint = num_zombie = num_stopped = 0;printk("<1>Hello, this module prints informations of current processes.\n");for_each_process(task){printk("%d\nProcess Name: %s\n", num_process, task->comm);printk("Process Pid: %d\n", task->pid);printk("Process State: ");num_process++;if(task->exit_state & TASK_STOPPED){printk("TASK_STOPPED ");num_stopped++;continue;}if(task->exit_state & TASK_ZOMBIE){printk("TASK_ZOMBIE ");num_zombie++;continue;}if(task->state & TASK_RUNNING){printk("TASK_RUNNING ");num_running++;}if(task->state & TASK_INTERRUPTIBLE){printk("TASK_INTERRUPTIBLE ");num_int++;}if(task->state & TASK_UNINTERRUPTIBLE){printk("TASK_UNINTERRUPTIBLE ");num_unint++;}printk("\nProcess State: %ld\n", task->state);printk("Process Parent: %s\n\n", task->parent->comm);}printk("---------------Statistics----------------\n");printk("Process Running: %d\n", num_running);printk("Process Interruptible: %d\n", num_int);printk("Process Uninterruptible: %d\n", num_unint);printk("Process Zombie: %d\n", num_zombie);printk("Process Stopped: %d\n", num_stopped);printk("Total Processes: %d\n", num_process);return 0;}void cleanup_module(void){printk("Removing module print_process_info...\n");printk("Succeeded!\n");printk("<1> Goodbye!\n");}MODULE_LICENSE("GPL");