2014.12.27

doc/2012lab/driver/.globalvar.ko.cmd

@@ -1 +1 @@
-cmd_/home/zhangxiao/embededSystem/example/driver/globalvar.ko := ld -r -m elf_i386 -T /usr/src/linux-2.6.32.60/scripts/module-common.lds --build-id -o /home/zhangxiao/embededSystem/example/driver/globalvar.ko /home/zhangxiao/embededSystem/example/driver/globalvar.o /home/zhangxiao/embededSystem/example/driver/globalvar.mod.o
+cmd_/home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.ko := ld -r -m elf_x86_64 -T /usr/src/linux-headers-3.11.0-26-generic/scripts/module-common.lds --build-id  -o /home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.ko /home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.o /home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.mod.o

doc/2012lab/driver/.tmp_versions/globalvar.mod

@@ -1,2 +1,2 @@
-/home/zhangxiao/embededSystem/example/driver/globalvar.ko
-/home/zhangxiao/embededSystem/example/driver/globalvar.o
+/home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.ko
+/home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.o

doc/2012lab/driver/globalvar.mod.c

@@ -6,33 +6,31 @@ MODULE_INFO(vermagic, VERMAGIC_STRING);
 
 struct module __this_module
 __attribute__((section(".gnu.linkonce.this_module"))) = {
- .name = KBUILD_MODNAME,
- .init = init_module,
+	.name = KBUILD_MODNAME,
+	.init = init_module,
 #ifdef CONFIG_MODULE_UNLOAD
- .exit = cleanup_module,
+	.exit = cleanup_module,
 #endif
- .arch = MODULE_ARCH_INIT,
+	.arch = MODULE_ARCH_INIT,
 };
 
 static const struct modversion_info ____versions[]
 __used
 __attribute__((section("__versions"))) = {
-	{ 0xfceff7dc, "module_layout" },
-	{ 0xf67ec283, "cdev_del" },
-	{ 0x93119e2c, "kmalloc_caches" },
-	{ 0xd7f78419, "cdev_init" },
-	{ 0x6980fe91, "param_get_int" },
-	{ 0x105e2727, "__tracepoint_kmalloc" },
-	{ 0x7485e15e, "unregister_chrdev_region" },
-	{ 0xff964b25, "param_set_int" },
-	{ 0xb72397d5, "printk" },
-	{ 0x2f287f0d, "copy_to_user" },
-	{ 0xb4390f9a, "mcount" },
-	{ 0xe9b1a2fa, "cdev_add" },
-	{ 0x57eb50b3, "kmem_cache_alloc" },
-	{ 0x37a0cba, "kfree" },
-	{ 0xd6c963c, "copy_from_user" },
-	{ 0x29537c9e, "alloc_chrdev_region" },
+	{ 0x4c46c04, __VMLINUX_SYMBOL_STR(module_layout) },
+	{ 0x15692c87, __VMLINUX_SYMBOL_STR(param_ops_int) },
+	{ 0xd1c71a37, __VMLINUX_SYMBOL_STR(cdev_add) },
+	{ 0xe62505cc, __VMLINUX_SYMBOL_STR(cdev_init) },
+	{ 0x7149fc2a, __VMLINUX_SYMBOL_STR(kmem_cache_alloc_trace) },
+	{ 0xbb323702, __VMLINUX_SYMBOL_STR(kmalloc_caches) },
+	{ 0x29537c9e, __VMLINUX_SYMBOL_STR(alloc_chrdev_region) },
+	{ 0x7485e15e, __VMLINUX_SYMBOL_STR(unregister_chrdev_region) },
+	{ 0x37a0cba, __VMLINUX_SYMBOL_STR(kfree) },
+	{ 0x2691f9d9, __VMLINUX_SYMBOL_STR(cdev_del) },
+	{ 0x4f8b5ddb, __VMLINUX_SYMBOL_STR(_copy_to_user) },
+	{ 0x4f6b400b, __VMLINUX_SYMBOL_STR(_copy_from_user) },
+	{ 0x27e1a049, __VMLINUX_SYMBOL_STR(printk) },
+	{ 0xbdfb6dbb, __VMLINUX_SYMBOL_STR(__fentry__) },
 };
 
 static const char __module_depends[]

doc/2012lab/driver/modules.order

@@ -1 +1 @@
-kernel//home/zhangxiao/embededSystem/example/driver/globalvar.ko
+kernel//home/xianb/WorkSpace/embedded_system/doc/2012lab/driver/globalvar.ko

doc/2012lab/poll/.char_dev.ko.cmd

@@ -0,0 +1 @@
+cmd_/home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.ko := ld -r -m elf_x86_64 -T /usr/src/linux-headers-3.11.0-26-generic/scripts/module-common.lds --build-id  -o /home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.ko /home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.o /home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.mod.o

doc/2012lab/poll/.tmp_versions/char_dev.mod

@@ -0,0 +1,2 @@
+/home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.ko
+/home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.o

doc/2012lab/poll/Makefile

@@ -1,5 +1,5 @@
 obj-m += char_dev.o
-obj-m += char_dev_new.o
+#obj-m += char_dev_new.o
 all:
 	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
 clean:

doc/2012lab/poll/char_dev.c

@@ -4,7 +4,7 @@
 #include <asm/uaccess.h>
 #include <linux/init.h>
 #include <linux/poll.h>
-
+#include <linux/slab.h>
 
 
 #define READ_BUF_SIZE	1024
@@ -107,7 +107,8 @@ int my_poll(struct file *filp, poll_table *wait)
     mask |= 1<<DRIVER_EVENT_BIT;
     return mask;
 }
-int  my_ioctl (struct inode *inode,struct file *filp,unsigned int cmd,unsigned long arg)
+//int  my_ioctl (struct inode *inode,struct file *filp,unsigned int cmd,unsigned long arg)
+int  my_ioctl (struct file *filp,unsigned int cmd,unsigned long arg)
 {
 	switch(cmd){
 		case 1 :{
@@ -136,7 +137,7 @@ open  :    my_open,			/* openº¯Ê */
 	   release:	my_release,	/* writeº¯Ê */   
 	   read:	my_read,		/* readº¯Ê */
 	   write:	my_write,		/* writeº¯Ê */
-	   ioctl:	my_ioctl,		/* ioctlº¯Ê */
+	   unlocked_ioctl:	my_ioctl,		/* ioctlº¯Ê */
 	   poll:	my_poll,		/* ioctlº¯Ê */
 
 };

doc/2012lab/poll/char_dev.mod.c

@@ -0,0 +1,42 @@
+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+
+struct module __this_module
+__attribute__((section(".gnu.linkonce.this_module"))) = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+static const struct modversion_info ____versions[]
+__used
+__attribute__((section("__versions"))) = {
+	{ 0x4c46c04, __VMLINUX_SYMBOL_STR(module_layout) },
+	{ 0x15692c87, __VMLINUX_SYMBOL_STR(param_ops_int) },
+	{ 0x35b6b772, __VMLINUX_SYMBOL_STR(param_ops_charp) },
+	{ 0x6bc3fbc0, __VMLINUX_SYMBOL_STR(__unregister_chrdev) },
+	{ 0x9f3ac793, __VMLINUX_SYMBOL_STR(__register_chrdev) },
+	{ 0xf432dd3d, __VMLINUX_SYMBOL_STR(__init_waitqueue_head) },
+	{ 0x7149fc2a, __VMLINUX_SYMBOL_STR(kmem_cache_alloc_trace) },
+	{ 0xbb323702, __VMLINUX_SYMBOL_STR(kmalloc_caches) },
+	{ 0x37a0cba, __VMLINUX_SYMBOL_STR(kfree) },
+	{ 0x4f8b5ddb, __VMLINUX_SYMBOL_STR(_copy_to_user) },
+	{ 0x27e1a049, __VMLINUX_SYMBOL_STR(printk) },
+	{ 0x4f6b400b, __VMLINUX_SYMBOL_STR(_copy_from_user) },
+	{ 0xd2b09ce5, __VMLINUX_SYMBOL_STR(__kmalloc) },
+	{ 0xbdfb6dbb, __VMLINUX_SYMBOL_STR(__fentry__) },
+};
+
+static const char __module_depends[]
+__used
+__attribute__((section(".modinfo"))) =
+"depends=";
+
+
+MODULE_INFO(srcversion, "5222B96E967A182D7A4AF6B");

doc/2012lab/poll/modules.order

@@ -0,0 +1 @@
+kernel//home/xianb/WorkSpace/embedded_system/doc/2012lab/poll/char_dev.ko

src/fifo/fifo_read.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#define FIFO_FILE "/tmp/myfifo"
+int main(void)
+{
+	char buf[100];
+	int n = 0; 
+	int fd;
+
+	if ((mkfifo(FIFO_FILE, S_IRWXU < 0) && (errno != EEXIST))) {
+		perror("mkfifo error");
+		exit(-1);
+	}
+
+	if ((fd = open(FIFO_FILE, O_RDONLY| O_NONBLOCK)) < 0) {
+		perror("open error");
+		exit(-1);
+	}
+
+	while (1) {
+		if ((n = read(fd, buf, 100)) < 0) {
+			/*已经被只写打开:返回 EAGAIN 错误*/
+			if (errno == EAGAIN) {
+				printf("No data yet\n");
+			}
+		} else if (n == 0)
+			printf("No opened by write_only\n");
+		else if (n > 0)
+			write(STDOUT_FILENO, buf, n);
+			sleep(1);
+	}
+
+	unlink(FIFO_FILE);
+	return 0;
+}

src/fifo/fifo_write.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#define FIFO_FILE "/tmp/myfifo"
+int main(void)
+{
+	int fd = 0;
+	int n;
+	char buf[100];
+
+	if ((fd = open(FIFO_FILE, O_WRONLY | O_NONBLOCK)) < 0) {
+		perror("open error");
+		exit(-1);
+	}
+	while (1) {
+		fgets(buf, 100, stdin);
+		n = strlen(buf);
+		if ((n = write(fd, buf, n)) < 0) {
+			if (errno == EAGAIN) {
+				printf("The FIFO has not been read yet, Please try later\n");
+			}
+		}
+	}
+	return 0;
+}

src/fifo/pipetest_second.c

@@ -0,0 +1,51 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+int main(int argc, char **argv)
+{
+	int pipe_fd[2];
+	pid_t pid;
+	char r_buf[4];
+	char* w_buf;
+	int writenum;
+	int cmd;
+
+	memset(r_buf,0,sizeof(r_buf));
+	if(pipe(pipe_fd)<0)
+	{
+		printf("pipe create error\n");
+		return -1;
+	}
+
+	if((pid=fork())==0)
+	{
+		/*子进程关闭写端口,这样的话pipe就不可用了*/
+//		close(pipe_fd[0]);
+		close(pipe_fd[1]);
+		sleep(2);	
+		exit(0);
+	}
+	else if(pid>0)
+	{
+		sleep(1);  //等待子进程完成关闭读端的操作
+		/*父进程关闭读端口*/
+		close(pipe_fd[0]);
+		w_buf="111";
+		printf("FILE: %s, LINE: %d\r\n", __FILE__, __LINE__);
+		/*父进程向子进程写入数据*/
+		writenum=write(pipe_fd[1],w_buf,4)==-1;
+
+		if((writenum=write(pipe_fd[1],w_buf,4))==-1)
+			printf("write to pipe error\n");
+		else	
+			printf("the bytes write to pipe is %d \n", writenum);
+
+		printf("FILE: %s, LINE: %d\r\n", __FILE__, __LINE__);
+		close(pipe_fd[1]);
+	}	
+	return 0;
+}

src/fifo/pipetest_simple.c

@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <string.h>
+#include <errno.h>
+
+int main(int argc, char ** argv)
+{
+	int pipe_fd[2];
+	pid_t pid;
+	char r_buf[100];
+	char w_buf[4];
+	int r_num;
+	int cmd;
+
+	memset(r_buf, 0, sizeof(r_buf));
+	memset(w_buf, 0, sizeof(w_buf));
+
+	if (pipe(pipe_fd) < 0) {
+		printf("FILE: %s, LINE: %d.pipe create error\n", __FILE__, __LINE__);
+		return -1;
+	}
+
+	/*子进程关闭写端口,父进程关闭读端口,建立一个从父进程到到子进程的通道*/
+	if ((pid = fork()) == 0) {
+		printf("##################\n");
+		close(pipe_fd[1]);		/*子进程关闭写端口*/
+		/*等待父进程向端口写入数据,然后子进程才能读数据*/
+		sleep(3);
+		/*父进程写入数据后进行读写数据*/
+		r_num = read(pipe_fd[0], r_buf, 100);
+		printf("child read num is %d, the data read from the pipe is %d\n", r_num, atoi(r_buf));
+		close(pipe_fd[0]);
+	} else if (pid > 0) {
+		close(pipe_fd[0]);		/*父进程关闭读端口*/
+		strcpy(w_buf, "111");
+		/*向pipe里写入数据*/
+		if (write(pipe_fd[1], w_buf, 4) != -1) {
+			printf("parent write over\n");
+		}
+		/*父进程关闭写端口,也就是关闭了pipe了*/
+		close(pipe_fd[1]);
+		printf("parent close fd[1]-write over\n");
+		sleep(3);
+	}
+	return 0;
+}

src/mmap/mmap_read.c

@@ -0,0 +1,34 @@
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+#define FILENAME "/tmp/test"
+#define BUFLEN 256
+
+typedef struct {
+	char name[BUFLEN];
+	int id;
+}people;
+
+int main(int argc, char ** argv)
+{
+	int i;
+	unsigned int *pmap = 0;
+	int fd;
+	fd = open(FILENAME, O_CREAT | O_RDWR, 00777);
+	assert(fd != -1);
+	pmap = (unsigned int *)mmap(0, sizeof(people), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	unsigned int *addr;
+	addr = pmap;
+	addr = pmap + sizeof(char)*BUFLEN;
+	printf("id = %id name = %s\n\r", *((int *)addr), (char *)pmap);
+	munmap((void *)pmap, sizeof(char) * BUFLEN);
+	close(fd);
+	printf("umap os\n\r");
+	return 0;
+}

src/mmap/mmap_write.c

@@ -0,0 +1,39 @@
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+#define FILENAME "/tmp/test"
+#define BUFLEN 256
+
+typedef struct {
+	char name[BUFLEN];
+	int id;
+}people;
+
+int main(int argc, char ** argv)
+{
+	int i;
+	unsigned int *pmap = 0;
+	int fd;
+	fd = open(FILENAME, O_CREAT | O_RDWR | O_TRUNC, 00777);
+	assert(fd != -1);
+	pmap = (unsigned int *)mmap(0, sizeof(people), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	write(fd, "", sizeof(people));
+	unsigned int *addr;
+	addr = pmap;
+	char tempname[30] = "xianb";
+	int tempid = 253;
+	addr = pmap + sizeof(char) * BUFLEN;
+	memcpy((void *)pmap, tempname, strlen(tempname));
+	memcpy((void *)addr, &tempid, sizeof(int));
+
+	munmap((void *) pmap, sizeof(char) * BUFLEN);
+	close(fd);
+	printf("umap ok\r\n");
+	return 0;
+}