写了个非常简陋的类似ps命令的driver

简陋的类似ps的driver，在/proc/steven_process下面存放了当前系统的进程列表
/*scan_process.c*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven");

int my_read_proc(char *page, char **start, off_t offset, int count,
         int *eof, void *data);

static int __init scan_process_init(void)
{
    create_proc_read_entry("steven_process", 0, NULL, my_read_proc, NULL);
    return 1;
}

static void __exit scan_process_exit(void)
{
    remove_proc_entry("steven_process", NULL);
    return;
}

int my_read_proc(char *page, char **start, off_t offset, int count, int *eof, void *data)
{
    int len = 0;
    int res;
    struct task_struct *p_struct;

    char *buf = kmalloc(sizeof(char) * 1024, GFP_KERNEL);
    if (NULL == buf)
    {
        printk("steven: kmalloc error!\n");
        return 0;
    }
    memset(buf, 0, sizeof(char) * 1024);
    for_each_process(p_struct)
    {
        len += sprintf(buf + len, "%d\t\t%d\t\t%s\n", p_struct->pid, p_struct->parent->pid, p_struct->comm);
    }
    res = strlen(buf);
    strncpy(page, buf, res);
    return res;
}

module_init(scan_process_init);
module_exit(scan_process_exit);




对应的Makefile

ifneq ($(KERNELRELEASE),)
    obj-m := scan_process.o
else
    KERNELDIR ?= /lib/modules/$(shell uname -r)/build
    PWD := $(shell pwd)
default:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
install:
    /sbin/insmod ./scan_process.ko
uninstall:
    /sbin/rmmod scan_process.ko
clean:
    rm -rf *.o *.ko *.mod*
endif


非常简陋，只是用于测试proc文件系统的接口。