Detecting connection break on serial port listener on linux
Hi,
Can anyone let me know how to detect the client connection break on a serial port listener on linux? I have written an application that opens the serial port and is able to read and write data. My serial port listener is running on Linux and I am using HyperTerminal (WIN-NT/2K) for communication on client side. The problem: Now when I DISCONNECT the client from the CALL menu in HyperTerminal, I am not able to detect the disconnection at the listener. Here is my sample piece of code. Please suggest something, if you have any idea or working on it. Thanking you in advance. Sample code follows: -------------------------------------------------------------------- #include <stdio.h> /* Standard input/output definitions */ #include <string.h> /* String function definitions */ #include <unistd.h> /* UNIX standard function definitions */ #include <fcntl.h> /* File control definitions */ #include <errno.h> /* Error number definitions */ #include <termios.h> /* POSIX terminal control definitions */ int main() { // open serial port for communication int serialFd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY ); if (fd == -1) { //printf("Could not open the port\n\n"); perror("open_port: Unable to open /dev/ttyS0 - "); } else fcntl(fd, F_SETFL, 0); struct termios options; //get the port options tcgetattr(serialFd, &options); cfsetispeed(&options, B9600); cfsetospeed(&options, B9600); options.c_cflag |= (CLOCAL | CREAD); // setting for 8bits, No parity, 1 Stop bit options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; options.c_cflag &= ~CSIZE; options.c_cflag |= CS8; // choosing raw input options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // ignore input parity check options.c_lflag &= ~INPCK; // check parity errors and strip parity bits options.c_lflag |= (IGNPAR | ISTRIP); //diabling software flow control options.c_lflag &= ~(IXON | IXOFF | IXANY); // choosing processed output and map NL to CR-NL options.c_lflag |= (OPOST | ONLCR); // set the configured options of the port tcsetattr(serialFd, TCSANOW, &options); // set port mode to no delay fcntl(serialFd, F_SETFL, FNDELAY); write(serialFd, "Welcome to PORT COM1", 20 ) ; int flag = 0; char buf[256]; memset(buf, 0, 256); while (flag == false) /* loop for input */ { int res = read(serialFd, buf, 255); buf[res]=0; write(fd, "Buffer read :%s\n", buf); if (buf[0]=='z') flag = true; } return 0; } |
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