first sample

03_day/jni/Android.mk

@@ -0,0 +1,8 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+LOCAL_CFLAGS    := -fPIE
+LOCAL_LDFLAGS   := -fPIE -pie
+LOCAL_MODULE    := myapp
+LOCAL_SRC_FILES := blocking_app.c
+include $(BUILD_EXECUTABLE)
+

03_day/jni/ioctl_app.c

@@ -0,0 +1,52 @@
+#if 1
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+#define  LED_RATIO   _IOW( 'm', 1 , int)
+
+int main()
+{
+	int fd, ret;
+	int ratio;
+	char buff[10];
+	printf("밝기 입력( 0-255 ) : ");
+	scanf("%d", &ratio );
+	fd = open( "/dev/mydev", O_RDONLY );
+	ret = ioctl(fd, LED_RATIO, &ratio);
+	if( ret < 0 )
+	{
+		printf("ret=%d, errno=%d\n", ret, errno );
+		return 0;
+	}
+	close(fd);
+	return 0;
+}
+#endif
+#if 0
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+#define  LED_RATIO   _IO( 'm', 1 )
+
+int main()
+{
+	int fd, ret;
+	char buff[10];
+	fd = open( "/dev/mydev", O_RDONLY );
+	ret = ioctl(fd, LED_RATIO);
+	if( ret < 0 )
+	{
+		printf("ret=%d, errno=%d\n", ret, errno );
+		return 0;
+	}
+	close(fd);
+	return 0;
+}
+#endif
+

03_day/jni/mmap_app.c

@@ -0,0 +1,21 @@
+#if 1
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+int main()
+{
+	int fd;
+	char *p;
+	fd = open("/dev/mydev", O_RDWR );
+	p = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	strcpy( p , "hello world\n");
+	printf("%s\n", p );
+	munmap(p, 4096);
+	close(fd);
+	return 0;
+}
+
+#endif
+

03_day/jni/myapp.c

@@ -0,0 +1,10 @@
+#include <fcntl.h>
+int main()
+{
+	int fd;
+	fd = open( "/sys/devices/virtual/misc/mydev/uevent", O_WRONLY );
+	write( fd, "add\n", 4 );
+	close(fd);
+	return 0;
+}
+

03_day/jni/poll_app.c

@@ -0,0 +1,59 @@
+#if 1
+#include <stdio.h>
+#include <poll.h>
+#include <fcntl.h>
+
+int main()
+{
+	int fd, ret;
+	int temp;
+	char buff[1024];
+	struct pollfd fds[2];
+	fd = open( "/dev/mydev", O_RDONLY );
+	fds[0].fd = 0 ;
+	fds[0].events = POLLIN;
+	fds[1].fd = fd ;
+	fds[1].events = POLLIN;
+
+	poll( fds, 2, -1 );
+
+	if( fds[0].revents & POLLIN )
+	{
+		read( 0, buff, sizeof buff );
+		buff[ret-1] = 0;
+		printf("buff=%s\n", buff );
+	}
+	if( fds[1].revents & POLLIN )
+	{
+		read( fd, &temp, sizeof temp );
+		printf("temp=%d\n", temp );
+	}
+	close(fd);
+	return 0;
+}
+#endif
+#if 0
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+#define  LED_RATIO   _IO( 'm', 1 )
+
+int main()
+{
+	int fd, ret;
+	char buff[10];
+	fd = open( "/dev/mydev", O_RDONLY );
+	ret = ioctl(fd, LED_RATIO);
+	if( ret < 0 )
+	{
+		printf("ret=%d, errno=%d\n", ret, errno );
+		return 0;
+	}
+	close(fd);
+	return 0;
+}
+#endif
+

03_day/jni/rdwr_app.c

@@ -0,0 +1,57 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+	int fd, ret;
+	char buff[10];
+	fd = open( "/dev/mydev", O_RDONLY );
+	ret = read( fd, buff, sizeof buff );
+	buff[ret] = 0;
+	printf( "buff[%s], ret=%d\n", buff, ret );
+	close(fd);
+	return 0;
+}
+/*
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+	int fd, ret;
+	int temp;
+	fd = open( "/dev/mydev", O_RDONLY );
+	ret = read( fd, &temp, sizeof temp );
+	printf( "temp=%d, ret=%d\n", temp, ret );
+	close(fd);
+	return 0;
+}
+*/
+
+/*
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+	int fd, ret;
+	char buff[] = "LED_ON";
+	fd = open( "/dev/mydev", O_WRONLY );
+	ret = write( fd, buff, strlen(buff) );
+	printf( "ret=%d\n", ret );
+	close(fd);
+	return 0;
+}
+*/
+/*
+#include <fcntl.h>
+int main()
+{
+	int fd;
+	int flag=128;
+	fd = open( "/dev/mydev", O_WRONLY );
+	write( fd, &flag, sizeof flag );
+	close(fd);
+	return 0;
+}
+*/