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[/] [eco32/] [trunk/] [monitor/] [loadserv/] [loadserv.c] - Rev 278
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/* * loadserv.c -- serial line load server */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #include <fcntl.h> #include <unistd.h> #include <termios.h> #define SYN ((unsigned char) 's') #define ACK ((unsigned char) 'a') #define LINE_SIZE 520 static int debugCmds = 1; static int debugData = 0; static FILE *loadFile = NULL; static int sfd = 0; static struct termios origOptions; static struct termios currOptions; void serialClose(void); void error(char *fmt, ...) { va_list ap; va_start(ap, fmt); printf("Error: "); vprintf(fmt, ap); printf("\n"); va_end(ap); if (loadFile != NULL) { fclose(loadFile); loadFile = NULL; } if (sfd != 0) { serialClose(); sfd = 0; } exit(1); } void serialOpen(char *serialPort) { sfd = open(serialPort, O_RDWR | O_NOCTTY | O_NDELAY); if (sfd == -1) { error("cannot open serial port '%s'", serialPort); } tcgetattr(sfd, &origOptions); currOptions = origOptions; cfsetispeed(&currOptions, B38400); cfsetospeed(&currOptions, B38400); currOptions.c_cflag |= (CLOCAL | CREAD); currOptions.c_cflag &= ~PARENB; currOptions.c_cflag &= ~CSTOPB; currOptions.c_cflag &= ~CSIZE; currOptions.c_cflag |= CS8; currOptions.c_cflag &= ~CRTSCTS; currOptions.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG | IEXTEN); currOptions.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK); currOptions.c_iflag &= ~(INPCK | ISTRIP | INLCR | IGNCR | ICRNL); currOptions.c_iflag &= ~(IXON | IXOFF | IXANY); currOptions.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET); tcsetattr(sfd, TCSANOW, &currOptions); } void serialClose(void) { tcsetattr(sfd, TCSANOW, &origOptions); close(sfd); } int serialSnd(unsigned char b) { int n; n = write(sfd, &b, 1); return n == 1; } int serialRcv(unsigned char *bp) { int n; n = read(sfd, bp, 1); return n == 1; } void connect(void) { unsigned char b; printf("SYN... "); fflush(stdout); while (!serialSnd(ACK)) ; tcdrain(sfd); printf("ACK... "); fflush(stdout); while (!serialRcv(&b)) ; if (b != ACK) { error("cannot synchronize with client"); } printf("connected\n"); } int main(int argc, char *argv[]) { char *serialPort; char *loadName; unsigned char b; unsigned char cmd; char line[LINE_SIZE]; int n, i; if (argc != 3) { printf("Usage: %s <serial port> <file to be loaded>\n", argv[0]); exit(1); } serialPort = argv[1]; loadName = argv[2]; loadFile = fopen(loadName, "rt"); if (loadFile == NULL) { error("cannot open file to be loaded '%s'", loadName); } /* open serial interface */ serialOpen(serialPort); /* wait for client to connect */ printf("Waiting for client...\n"); while (1) { if (serialRcv(&b) && b == SYN) { break; } } connect(); fseek(loadFile, 0, SEEK_SET); /* connected, now handle requests */ while (1) { while (!serialRcv(&cmd)) ; if (cmd == 'q') { /* quit */ if (debugCmds) { printf("quit\n"); } break; } if (cmd == SYN) { /* this happens if the client has been reset */ connect(); fseek(loadFile, 0, SEEK_SET); continue; } if (cmd != 'r') { /* unknown command */ if (debugCmds) { printf("unknown... UNCMD\n"); } continue; } /* only read requests get here */ if (debugCmds) { printf("reading record... "); fflush(stdout); } if (fgets(line, LINE_SIZE, loadFile) == NULL) { if (debugCmds) { printf("RDERR\n"); } } else { n = strlen(line); for (i = 0; i < n; i++) { while (!serialSnd(line[i])) ; } tcdrain(sfd); if (debugCmds) { printf("OK\n"); } if (debugData) { printf("%s", line); } } } if (loadFile != NULL) { fclose(loadFile); loadFile = NULL; } if (sfd != 0) { serialClose(); sfd = 0; } return 0; }
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