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int main(int argc, char **argv) { int listenfd, connfd; struct sockaddr_in servaddr; char buf[100]; time_t ticks; int done = 0; int rc; fd_set readset; int result; struct timeval tv; Setting up & printf("Daytime Server\n"); listening on socket listenfd = socket(AF_INET,SOCK_STREAM,0); bzero(&servaddr,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = INADDR_ANY; servaddr.sin_port = htons(PORTNUMBER); rc = bind(listenfd, (struct sockaddr *) &servaddr,sizeof(servaddr)); if (rc != 0) { printf("after bind,rc = [%d]\n",rc); return rc; Setting up & } listening on socket listen(listenfd,5); while (!done) { printf("Waiting for connection\n"); while (1) { bzero(&tv,sizeof(tv)); tv.tv_sec = 2; FD_ZERO(&readset); FD_SET(listenfd, &readset); result = select(listenfd + 1, &readset, &readset, NULL, &tv); if (result >= 1) { printf("Incoming connection!\n"); break; } else if (result == 0) { printf("Timeout.\n"); continue; } else { printf("Error, leave.\n"); return result; } } printf("Calling accept:\n"); Accepting connfd = accept(listenfd, socket connection (struct sockaddr *) NULL, NULL); printf("Connecting\n"); ticks = time(NULL);
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What time is it The DayTime Server
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sprintf(buf,"%.24s",ctime(&ticks)); printf("sending [%s]\n",buf); write(connfd,buf,strlen(buf)); close(connfd); RecordHit(buf); } return 0; }
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Recording activity
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As with many C language applications, a number of headers B are required, including definitions and prototypes for time functions, SQLite functions, and for TCP sockets. Note that the sqlite3.h header file isn t provided in the CodeSourcery tool chain. This file was acquired from a sqlite3 distribution, and the file was copied into the local directory along with daytime.c. This is why the include file is delimited with quotation marks rather than <>, which is used for finding include files in the system or compiler path. The htons function is typically implemented in the library named socket (libsocket.so). Android doesn t provide this library, nor was this found in any of the system libraries. Therefore htons is defined here as a macro D. This macro is required to get the network byte ordering correct. When the application is running, you can verify this port by running netstat tcp on the command line in the adb shell. The standard TCP port for a DayTime Server is port 13. In C, the application is using port 1024 because our application can t bind to any port numbered 1023 or below. Only system processes may bind to ports below 1024. In the RecordHit function, you see SQLite interaction E. The RecordHit() function is responsible for inserting a record into the SQLite database created for this application. Jumping into the main function, you see the socket functions in use to listen on a socket for incoming connections F. When a connection is accepted G, the current system time is sent to the calling client. After this, the application makes a record of the transaction by calling the RecordHit function H. That s all the code necessary to implement our Android/Linux DayTime Server application. Let s look next at the SQLite 3 database interaction in more detail.
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13.3.3 The SQLite database
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This application employs a simple database structure created with the SQLite 3 application. We interact with SQLite 3 from the adb shell environment, as shown in figure 13.7. The purpose of this database is to record data each time the DayTime Server processes an incoming request. From a data perspective, this sample is boring, as it simply records the system time along with the text returned to the client (this text is a ctimeformatted time string). Though somewhat redundant from a data perspective, the purpose is to demonstrate the use of SQLite from our C application, utilizing the Android/Linux resident sqlite3 library, libsqlite.so.
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Interact with SQLite 3 from the command line in the adb shell.
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The previous section of code outlined the syntax for inserting a row into the database; this section shows how to interact with the database using the SQLite 3 tool. The sequence shown in figure 13.7 is broken out and explained in the following listing.
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