irq.c

   1 #define __USE_BSD_SIGNAL 1
   2
   3 #define IRQ 4
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <signal.h>
   8 #include <sys/ioctl.h>
   9 #include <sys/types.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12
  13
  14 #define IRQ_SET 1
  15 #define IRQ_RELEASE 2
  16 #define IRQ_INFO 3
  17
  18 struct irq_struct
  19 {
  20   int irq;
  21   int process_id;
  22   int signal_num;
  23   struct file *file;
  24   unsigned char *irq_buffer;
  25   int buf_start;
  26   int buf_count;
  27   int buf_size;
  28 }
  29  setting;
  30
  31
  32 int fioctl(FILE *f,int cmd,void *arg)
  33 {
  34 return(ioctl(fileno(f),cmd,arg));
  35 }
  36
  37
  38 void handler(int irq)
  39 {
  40 printf("got signal %d\n",irq);
  41 }
  42
  43
  44 main()
  45 {
  46 int fd = open("/dev/irq",O_RDWR);
  47 char buf[10];
  48 int i;
  49 char c = IRQ;
  50 for (i=0;i<10;i++)
  51   buf[i] = IRQ;
  52
  53 setting.irq = IRQ;
  54 setting.process_id = getpid();
  55 setting.signal_num = SIGSEGV;
  56 setting.buf_size = 100;
  57
  58 signal(SIGSEGV,handler);
  59
  60 printf("ioctl gave %d\n",ioctl(fd,IRQ_SET,&setting));
  61
  62 printf("irq %d\npid %d\nsig %d\ncount %d\nsize %d\n",
  63        setting.irq,
  64        setting.process_id,
  65        setting.signal_num,
  66        setting.buf_count,
  67        setting.buf_size);
  68
  69 c = IRQ;
  70 printf("write gave %d\n",write(fd,buf,10));
  71
  72 printf("info gave %d\n",ioctl(fd,IRQ_INFO,&setting));
  73 printf("irq %d\npid %d\nsig %d\ncount %d\nsize %d\n",
  74        setting.irq,
  75        setting.process_id,
  76        setting.signal_num,
  77        setting.buf_count,
  78        setting.buf_size);
  79
  80 printf("read gave %d\n",read(fd,&c,1));
  81 printf("c is %d\n",(int)c);
  82 printf("info gave %d\n",ioctl(fd,IRQ_INFO,&setting));
  83 printf("irq %d\npid %d\nsig %d\ncount %d\nsize %d\n",
  84        setting.irq,
  85        setting.process_id,
  86        setting.signal_num,
  87        setting.buf_count,
  88        setting.buf_size);
  89 while (1);
  90 }
  91
  92
  93
  94