About the two pieces of code that have been stuck to die, hope to LDD3 interested person poke open this blog:)

Want to have a little hate yourself, a few months ago encountered the "problem." There is still no solution. has been stuck to death, and can not find the reason.

Spit a groove, those only sticker code not attached to the results of the toturial, I said ... I don't understand, since some bloger codes are given.

What if I had this slag to look at the swelling? What happens when you run the results?

Description: Amount ...　This problem "paste" did not attach the results of the operation, is because the direct will be stuck to my Linux host, and then I have no way to screen for everyone to see, there is no way to debug. wish to understand

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Problem code One:

/***********************************************************code Writer:eofcode Date:2014.09.02code file:proc_ Time_delay.ce-mail: [Email protected]code purpose:this code is programmed for what to delay 1 second by jiffies and HZ . If there is something wrong with my code, please touchme by e-mail. Thank you.************************************************************/#include <linux/init.h> #include < linux/module.h> #include <linux/moduleparam.h> #include <linux/fs.h> #include <linux/proc_fs.h> /* for PROCFS */#include <linux/seq_file.h>/* for ' struct seq_file ' */#include <linux/types.h> #include < linux/jiffies.h>/* for Jiffies */#define PROC_NAME "Delay_one_second" Module_author ("Jason leaster"); Module_license ("Dual BSD/GPL"); static int proc_demo_seq_show (struct seq_file* sfile,void* v) {int tmp = 0;unsigned long ji f = jiffies;unsigned Long One_second_later = jiffies + hz;for (tmp = 0; tmp < 10;tmp++) {while (Time_after (one_second_late R,jif) {jif = jiffies;} One_second_later = Jif + hz;seq_printf (sfile, "Hello world! jiffies:%lu\n", Jif);} return 0;} Static void* Proc_demo_seq_start (struct seq_file* sfile,loff_t *pos) {return NULL;} static void Proc_demo_seq_stop (struct seq_file* sfile,void* v) {/* Nothing to is done. */}static void* Proc_demo_seq_next (s Truct seq_file* sfile,void* v,loff_t* pos) {return NULL;} static struct Seq_operations Proc_demo_ops = {. start=proc_demo_seq_start,.next=proc_demo_seq_next,.stop=proc_demo_ seq_stop,.show=proc_demo_seq_show,};static int Proc_demo_open (struct inode* inode, struct file* filp) {return single_ Open (Filp,&proc_demo_seq_show,null);} struct File_operations proc_demo_fops = {. owner=this_module,.open=proc_demo_open,.read=seq_read,.release=seq_ Release,};int proc_demo_init (void) {struct Proc_dir_entry * entry = Null;entry =proc_create (proc_name,0,null,&proc _demo_fops), if (!entry) {PRINTK (kern_alert "line:%d proc_create failed!", __line__);} return 0;} void Proc_demo_exit (void) {/*** the SECond parameter of ' remove_proc_entry () ' is * * A pointer which point to parent directory. We create our** proc-entry-point in/proc/, so we pass NULL into It.*/remove_proc_entry (proc_name,null);} Module_init (Proc_demo_init); Module_exit (Proc_demo_exit);

Issue Code 2:

/***********************************************************code Writer:eofcode Date:2014.09.02code file:proc_ Time_delay.ce-mail: [Email protected]code purpose:this code is programmed for what to delay by Kerneltimer. If there is something wrong with my code, please touchme by e-mail. Thank you.************************************************************/#include <linux/init.h> #include < linux/module.h> #include <linux/moduleparam.h> #include <linux/fs.h> #include <linux/proc_fs.h> /* for PROCFS */#include <linux/seq_file.h>/* for ' struct seq_file ' */#include <linux/types.h> #include < linux/jiffies.h>/* for Jiffies */#include <linux/timer.h>/* for timer*/#include <linux/sched.h># Include <linux/slab.h> #define PROC_NAME "Delay_kernel_timer" Module_author ("Jason leaster"); Module_license ("Dual BSD/GPL"); #define LOOP 5/***first of all, you should make abstract a model** for our device driver an D include the timer.*/struct timeR_delay_model{struct timer_list timer;wait_queue_head_t wait;unsigned long prevjiffies;struct seq_file* output;int loops;/*...*/};void jif_timer_fn (unsigned long arg) {struct timer_delay_model* P_model = (struct timer_delay_model*) arg ; unsigned long jif = jiffies;seq_printf (P_model->output, "Hello world! jiffies:%lu\n", Jif);p RINTK (Kern_alert "in Jif _timer_fc%d\n ", p_model->loops);/*if (-(P_model->loops)) {p_model->timer.expires + = HZ;p_model-> prevjiffies= Jif;add_timer (&p_model->timer);} Else{wake_up_interruptible (&p_model->wait);} */p_model->loops = 0;} static int proc_demo_seq_show (struct seq_file* sfile,void* v) {unsigned long jif = jiffies;struct timer_delay_model* p_mod El;p_model = kmalloc (sizeof (struct Timer_delay_model), Gfp_kernel), if (!p_model) {PRINTK (kern_alert "Kmalloc" error in%d %s\n ", __line__,__function__); return-enomem;} ELSE{PRINTK (Kern_alert "start to Initialization%lu\n", jiffies); Init_timer (&p_model->timer); init_waitqueue_ Head (&p_model->wait);p _model->prevjiffies= jif;p_model->output= sfile;p_model->loops= LOOP;p_model-> Timer.data= (unsigned long) sfile;p_model->timer.function = jif_timer_fn;p_model->timer.expires= Jif + HZ;// Delay 1 SECONDPRINTK (kern_alert "add_timer ing%lu\n", jiffies); Add_timer (&p_model->timer);} PRINTK (Kern_alert "Add_timer finished%lu\n", jiffies);//wait_event_interruptible (p_model->wait,! ( P_model->loops)); while (Time_after (p_model->prevjiffies + hz,jif)) {jif = jiffies;} PRINTK (kern_alert "Wait finished\n"); Kfree (P_model); if (signal_pending (current)) Return-erestartsys;return 0;} Static void* Proc_demo_seq_start (struct seq_file* sfile,loff_t *pos) {return NULL;} static void Proc_demo_seq_stop (struct seq_file* sfile,void* v) {/* Nothing to is done. */}static void* Proc_demo_seq_next (s Truct seq_file* sfile,void* v,loff_t* pos) {return NULL;} static struct Seq_operations Proc_demo_ops = {. start=proc_demo_seq_start,.next=proc_demo_seq_next,.stop=proc_demo_ Seq_stop,.show=proc_demo_seq_show,};static int Proc_demo_open (struct inode* inode, struct file* filp) {return Single_open (FILP, &proc_demo_seq_show,null);} struct File_operations proc_demo_fops = {. Owner=this_module,.open=proc_demo_open,.read=seq_read,.release=single_ Release,};int proc_demo_init (void) {struct Proc_dir_entry * entry = Null;entry =proc_create (proc_name,0,null,&proc _demo_fops), if (!entry) {PRINTK (kern_alert "line:%d proc_create failed!", __line__);} return 0;} void Proc_demo_exit (void) {/*** The second parameter of ' remove_proc_entry () ' is * * A pointer which point to parent D Irectory. We create our** proc-entry-point in/proc/, so we pass NULL into It.*/remove_proc_entry (proc_name,null);} Module_init (Proc_demo_init); Module_exit (Proc_demo_exit);

Readers who have read LDD3 or ELDD can share the discussion:)

About the two pieces of code that have been stuck to die, hope to LDD3 interested person poke open this blog:)