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01_day/Android.mk

@@ -0,0 +1,5 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := myapp.c
+LOCAL_MODULE := myapp
+include $(BUILD_EXECUTABLE)

01_day/InitKernelLogging.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main()
+{
+	int fd = open("__null__", O_RDWR);
+	dup2(fd, 0);
+	dup2(fd, 1);
+	dup2(fd, 2);
+	if (fd > 2) close(fd);
+
+	printf("hello world\n");
+	return 0;
+}

01_day/envp.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+//int main()
+//int main(int argc, char **argv)
+int main(int argc, char **argv, char **envp)
+{
+	int i;
+	for(i=0; envp[i]; i++ )
+		printf("envp[%d]=%s\n", i, envp[i] );
+	return 0;
+}

01_day/execv.c

@@ -0,0 +1,11 @@
+#include <unistd.h>
+#include <stdio.h>
+int main(int argc, char **argv)
+{
+	char* path = argv[0];
+    char* args[] = { path, 0 };
+	printf("before\n");
+	execv(path, argv);
+	printf("after\n");
+	return 0;
+}

01_day/flex_array.c

@@ -0,0 +1,33 @@
+#if 1
+#include <stdio.h>
+struct aaa
+{
+	int count;
+	int b[];
+};
+
+int main()
+{
+	struct aaa *pa;
+	pa = (struct aaa*)malloc( sizeof(struct aaa) + sizeof(int)*10 );
+	pa->count = 10;
+	pa->b[9] = 10;
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+struct aaa
+{
+	int a;
+	int b[];
+};
+
+int main()
+{
+	struct aaa aaa;
+	printf("%lu\n", sizeof aaa );
+	return 0;
+}
+#endif

01_day/fork.c

@@ -0,0 +1,345 @@
+#if 1
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+void my_sig( int signo )
+{
+	printf("my_sig(%d)\n", signo );
+	while( waitpid(-1,0,WNOHANG) > 0 )
+		;
+}
+
+int main()
+{
+	int i,j;
+	signal( SIGCHLD, my_sig );
+	for(i=0; i<5; i++ )
+	{
+		if( fork() == 0 )
+		{
+			for(j=0; j<i+1; j++ )
+			{
+				printf("\t\t\t\tchild\n");
+				sleep(1);
+			}
+			exit(0);
+		}
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+void my_sig( int signo )
+{
+	printf("my_sig(%d)\n", signo );
+	while( wait(0) > 0 )
+		;
+}
+
+int main()
+{
+	int i,j;
+	signal( SIGCHLD, my_sig );
+	for(i=0; i<5; i++ )
+	{
+		if( fork() == 0 )
+		{
+			for(j=0; j<i+1; j++ )
+			{
+				printf("\t\t\t\tchild\n");
+				sleep(1);
+			}
+			exit(0);
+		}
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+void my_sig( int signo )
+{
+	printf("my_sig(%d)\n", signo );
+	while( wait(0) > 0 )
+		;
+}
+
+int main()
+{
+	int i,j;
+	signal( SIGCHLD, my_sig );
+	for(i=0; i<100; i++ )
+	{
+		if( fork() == 0 )
+		{
+			for(j=0; j<3; j++ )
+			{
+				printf("\t\t\t\tchild\n");
+				sleep(1);
+			}
+			exit(0);
+		}
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+void my_sig( int signo )
+{
+	printf("my_sig(%d)\n", signo );
+	wait(0);
+}
+
+int main()
+{
+	int i,j;
+	signal( SIGCHLD, my_sig );
+	for(i=0; i<100; i++ )
+	{
+		if( fork() == 0 )
+		{
+			for(j=0; j<3; j++ )
+			{
+				printf("\t\t\t\tchild\n");
+				sleep(1);
+			}
+			exit(0);
+		}
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+void my_sig( int signo )
+{
+	printf("my_sig(%d)\n", signo );
+	wait(0);
+}
+
+int main()
+{
+	int i;
+	signal( SIGCHLD, my_sig );
+	if( fork() == 0 )
+	{
+		for(i=0; i<3; i++ )
+		{
+			printf("\t\t\t\tchild\n");
+			sleep(1);
+		}
+		exit(0);
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main()
+{
+	int i;
+	if( fork() == 0 )
+	{
+		for(i=0; i<3; i++ )
+		{
+			printf("\t\t\t\tchild\n");
+			sleep(1);
+		}
+		exit(0);
+	}
+	wait(0);
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main()
+{
+	int i;
+	if( fork() == 0 )
+	{
+		for(i=0; i<3; i++ )
+		{
+			printf("\t\t\t\tchild\n");
+			sleep(1);
+		}
+		exit(0);
+	}
+	for(;;)
+	{
+		printf("parent\n");
+		sleep(1);
+	}
+	return 0;  
+}
+#endif
+
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main()
+{
+	char *argv[] = { "ls", (char*)0 };
+	printf("prompt > ls\n");
+	if( fork() == 0 )
+		execve("/bin/ls", argv, 0);
+	wait(0);
+	printf("prompt > \n");
+	return 0;  // exit(main());
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+	char *argv[] = { "ls", (char*)0 };
+	printf("prompt > ls\n");
+	if( fork() == 0 )
+		execve("/bin/ls", argv, 0);
+	sleep(1);
+	printf("prompt > \n");
+	return 0;  // exit(main());
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+	char *argv[] = { "ls", (char*)0 };
+	printf("prompt > ls\n");
+	execve("/bin/ls", argv, 0);
+	printf("prompt > \n");
+	return 0;
+}
+#endif
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+	char *argv[] = { "ls", (char*)0 };
+	execve("/bin/ls", argv, 0);
+	printf("after\n");
+	return 0;
+}
+#endif
+
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+	pid_t pid;
+	pid = fork();
+	if( pid == 0 )
+		printf("child\n");
+	else
+		printf("parent\n");
+	return 0;
+}
+#endif
+
+#if 0
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+	fork();
+	printf("after\n");
+	return 0;
+}
+#endif

01_day/klog.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main()
+{
+	int fd = open("__kmsg__", O_RDWR);
+	write(fd, "hello world\n", 12);
+	close(fd);
+	return 0;
+}

01_day/main.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <libgen.h>
+#include <string.h>
+// # /init
+int main(int argc, char** argv) {
+	printf("%s\n", basename(argv[0]));
+    if (!strcmp(basename(argv[0]), "ueventd")) {
+        //return ueventd_main(argc, argv);
+		printf("ueventd\n");
+    }
+	return 0;
+}
+

01_day/myapp.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main()
+{
+	printf("Hello Android\n");
+	return 0;
+}

01_day/umask.c

@@ -0,0 +1,12 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+int main()
+{
+	int fd;
+	umask(0);
+	fd = open("aaa", O_CREAT| O_TRUNC | O_RDWR , 0666 );
+	close(fd);
+	return 0;
+}