View source for Condor 2009 Winter

Jan 29, 2009:

Fedora 10 Uses Condor 7.2 so we should switch from 7.0.5.

* git clone git://git.et.redhat.com/mrg-grid.git
* cd mrg-grid
* git-checkout -b jas origin/V7.2.0-condor_config.generic
* cd src
* ./build_init
* ./configure --disable-full-port --enable-proper --disable-gcc-version-check --disable-glibc-version-check
* make
* make release

Feb 8, 2009:

*yum install seamonkey                         //used to edit html to get the C program
*yum groupinstall "Development Libraries"
*yum groupinstall "Development Tools"
*server.c
#include <error.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/poll.h>
#include <sys/poll.h>
int main (int argc, char *argv[])
{
  struct servent *s = getservbyname ("echo", "tcp");
  if (s == NULL)
    error (EXIT_FAILURE, errno, "getservent");
  struct pollfd fds[1];
  int nfds = 0;
  fds[nfds].fd = socket (AF_INET, SOCK_STREAM, 0);
  if (fds[nfds].fd == -1)
    error (EXIT_FAILURE, errno, "socket");
  fds[nfds].events = POLLIN;
  int opt = 1;
  setsockopt (fds[nfds].fd, SOL_SOCKET, SO_REUSEADDR,
              opt, sizeof (opt));
  struct sockaddr_in sin;
  sin.sin_family = AF_INET;
  sin.sin_port = s->s_port;
  sin.sin_addr.s_addr = INADDR_ANY;
  if (bind (fds[nfds].fd,
            &sin, sizeof (sin)) != 0)
    error (EXIT_FAILURE, errno, "bind");
  if (listen (fds[nfds].fd, SOMAXCONN) != 0)
    error (EXIT_FAILURE, errno, "listen");
  ++nfds;
  int i = 0;
  while (1)
    {
      int n = poll (fds, nfds, -1);
      if (n > 0)

        if (fds[i].revents & POLLIN)
          {
            struct sockaddr_in rem;
            socklen_t remlen = sizeof (rem);
            int fd = accept (fds[i].fd, (struct sockaddr *) &rem, &remlen);
            if (fd != -1)
              {
                struct hostent *h = gethostbyaddr (&rem.sin_addr,
                                                   sizeof (rem.sin_addr),
                                                   rem.sin_family);
                char *buf1 = h ? h->h_name : "???";
                char *buf2 = inet_ntoa (rem.sin_addr);

                printf ("connection from %s (%s)\n", buf1, buf2);
                char buf[1000];
                ssize_t l = read (fd, buf, sizeof (buf));
                buf[0]='J';
                write (fd, buf, l);
                close (fd);
              }
          }
    }
}

*cc server.c -o server
*client.c
#include <errno.h>
#include <error.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
int main (int argc, char *argv[])
{
  int result = 0;
  struct hostent *h = gethostbyname (argv[1]);
  if (h == NULL)
    error (EXIT_FAILURE, errno, "gethostbyname");
  struct servent *s = getservbyname ("echo", "tcp");
  if (s == NULL)
    error (EXIT_FAILURE, errno, "getservbyname");
  struct in_addr **addrs = (struct in_addr **) h->h_addr_list;
  while (*addrs != NULL)
    {
      int sock = socket (PF_INET, SOCK_STREAM, 0);
      if (sock != -1)
        {
          struct sockaddr_in sin;
          sin.sin_family = AF_INET;
          sin.sin_port = s->s_port;
          sin.sin_addr = **addrs;
          if (connect (sock,
                       (struct sockaddr *) &sin, sizeof (sin)) == 0)
            {
              char *line = NULL;
              size_t len = 0;
              ssize_t n = getline (&line, &len, stdin);
              write (sock, line, n);
              n = read (sock, line, len);
              write (STDOUT_FILENO, line, n);
              close (sock);
              goto out;
            }
          close (sock);
        }
      ++addrs;
    }
  error (0, 0, "cannot contact %s", argv[1]);
  result = 1;
  out:
  return result;
}
*cc client.c -o client
*./server
*./client localhost                          //open another terminal to run it, then type a little word to test.   OK