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tbench_srv.c

/* 
   dbench version 2
   Copyright (C) Andrew Tridgell 1999
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#include "dbench.h"

struct options options = {
      .tcp_options = TCP_OPTIONS
};

static void server(int fd)
{
      char buf[70000];
      unsigned *ibuf = (unsigned *)buf;
      uint32_t n;

      signal(SIGPIPE, SIG_IGN);
      
      printf("^"); fflush(stdout);

      while (1) {
            if (read_sock(fd, buf, 4) != 4) break;
            n = ntohl(ibuf[0]);
            if (n+4 >= sizeof(buf)) {
                  printf("overflow in server!\n");
                  exit(1);
            }
            if (read_sock(fd, buf+4, n) != (int)n) break;
            n = ntohl(ibuf[1]);
            ibuf[0] = htonl(n);
            if (write_sock(fd, buf, n+4) != (int)(n+4)) break;
      }

      exit(0);
}

static void listener(void)
{
      int sock;

      sock = open_socket_in(SOCK_STREAM, TCP_PORT);

      if (listen(sock, 20) == -1) {
            fprintf(stderr,"listen failed\n");
            exit(1);
      }

      printf("waiting for connections\n");

      signal(SIGCHLD, SIG_IGN);

      while (1) {
            struct sockaddr addr;
            socklen_t in_addrlen = sizeof(addr);
            int fd;

            while (waitpid((pid_t)-1,(int *)NULL, WNOHANG) > 0) ;

            fd = accept(sock, &addr, &in_addrlen);

            if (fd != -1) {
                  if (fork() == 0) server(fd);
                  close(fd);
            }
      }
}


static void usage(void)
{
      printf("usage: tbench_srv [OPTIONS]\n"
             "options:\n"
             "  -t options       set socket options\n");
      exit(1);
}


static void process_opts(int argc, char **argv)
{
      int c;

      while ((c = getopt(argc, argv, "t:")) != -1) {
            switch (c) {
            case 't':
                  options.tcp_options = optarg;
                  break;
            default:
                  usage();
            }
      }
}


 int main(int argc, char *argv[])
{
      process_opts(argc, argv);

      listener();
      return 0;
}

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