initial commit

Makefile

+obj-m += charbridge.o

build.sh

+#!/bin/sh
+
+#kversion=2.6.16
+#kversion=2.6.12
+kversion=2.6.28
+flavour=lks-wks
+. /usr/src/linux-$kversion-$flavour/gcc_version.inc
+
+PWD=`pwd`
+
+#make -C /usr/src/linux SUBDIRS=$PWD V=1 modules
+make -C /usr/src/linux-$kversion-$flavour SUBDIRS=$PWD V=1 modules
+
+#   ..
+#gcc -o ioctl ioctl.c

charbridge.h

+/*
+ *  charbridge.h -  ioctl.
+ *
+ *  ,   ,      ,
+ *        (charbridge.c),   
+ *    (ioctl.c)
+ */
+
+#ifndef CHARBRIDGE_H
+#define CHARBRIDGE_H
+
+#include <linux/ioctl.h>
+
+/* 
+ *   .    ioctl,
+ *       ,
+ *      .
+ */
+#define MAJOR_NUM 255
+
+/* 
+ *  ""  
+ * (     )
+ * ..    ,   sideA 
+ *    0..99,   sideB 100...199
+ *  ""      100!
+ */
+#define MAX_DEV 10
+#define MAX_PAIR 100
+
+//   0..99 		-  sideA0...sideA99
+//   100..199	-  sideB0...sideB99
+
+/* 
+ *     
+ */
+#define IOCTL_SET_MSG _IOR(MAJOR_NUM, 0, char *)
+/*
+ * _IOR ,    
+ *      
+ *
+ *  , MAJOR_NUM --   .
+ *
+ *   --  
+ * (   ).
+ *
+ *   --  ,   
+ */
+
+/* 
+ *      
+ */
+#define IOCTL_GET_MSG _IOR(MAJOR_NUM, 1, char *)
+/* 
+ *   IOCTL    .
+ *     ,     
+ *  ,      .
+ */
+
+/* 
+ *   n-  
+ */
+#define IOCTL_GET_NTH_BYTE _IOWR(MAJOR_NUM, 2, int)
+/* 
+ *   IOCTL    ,    .
+ *       (n),
+ *   n-   (Message[n]). 
+ */
+
+/* 
+ *   
+ */
+#define DEVICE_FILE_NAME "cbside"
+//#define DEV1_NAME "/dev/cbsideA"
+//#define DEV2_NAME "/dev/cbsideB"
+
+#endif

ioctl.c

+/*
+ *  ioctl.c -  ,  ioctl    
+ *
+ *        cat,    / .
+ *        ,    ioctl.
+ */
+
+/* 
+ *        ioctl
+ */
+#include "charbridge.h"
+
+#include <fcntl.h>      /* open */
+#include <unistd.h>     /* exit */
+#include <sys/ioctl.h>  /* ioctl */
+#include <errno.h>
+
+/* 
+ *      ioctl  
+ */
+
+ioctl_set_msg(int file_desc, char *message)
+{
+  int ret_val;
+
+  ret_val = ioctl(file_desc, IOCTL_SET_MSG, message);
+
+  if (ret_val < 0) {
+    printf("   ioctl_set_msg: %d\n", ret_val);
+    exit(-1);
+  }
+}
+
+ioctl_get_msg(int file_desc)
+{
+  int ret_val;
+  char message[100];
+
+  /* 
+   *  -     --     
+   *   ,    .
+   *      
+   *   ioctl   :
+   *      
+   */
+  ret_val = ioctl(file_desc, IOCTL_GET_MSG, message,sizeof(message));
+
+  if (ret_val < 0) {
+    printf("   ioctl_get_msg: %d\n", ret_val);
+    exit(-1);
+  }
+
+  printf("  (get_msg): %s\n", message);
+}
+
+ioctl_get_nth_byte(int file_desc)
+{
+  int i;
+  char c;
+
+  printf("N-    (get_nth_byte): ");
+
+  i = 0;
+  while (c != 0) {
+    c = ioctl(file_desc, IOCTL_GET_NTH_BYTE, i++);
+
+    if (c < 0) {
+      printf
+        ("   ioctl_get_nth_byte  %d- .\n", i);
+      exit(-1);
+    }
+
+    putchar(c);
+  }
+  putchar('\n');
+}
+
+/* 
+ * Main -    ioctl
+ */
+main()
+{
+  int file_desc, ret_val;
+  char *msg = "    ioctl\n";
+
+//  file_desc = open(DEVICE_FILE_NAME, 0);
+  file_desc = open("/dev/cbsideA", 0);
+  if (file_desc < 0) {
+    printf("   : %s\n", DEVICE_FILE_NAME);
+	printf("With error(%d): %s\n", errno, strerror(errno));
+    exit(-1);
+  }
+
+  ioctl_set_msg(file_desc, msg);
+  ioctl_get_msg(file_desc);
+  ioctl_get_nth_byte(file_desc);
+  close(file_desc);
+}

mkdev.sh

+#!/bin/sh
+
+for num in `seq 0 9`; do
+
+	numB=`echo $num+100 | bc`
+	mknod /dev/cbsideA$num c 254 $num
+	mknod /dev/cbsideB$num c 254 $numB
+	chmod 'a+rw' /dev/cbsideA$num /dev/cbsideB$num
+
+done