Re: xfree86 runs but programs can't connect to it

["Shu Shimizu" <ShuShimizu at home dot com>]

Hi,

I am afraid my post might have frustrated you.
Let me explain a little more on the fact occured on my ThinkPad.

I tried to excerpt a skelton of startup operations from libX as follows:

   socket()
   connect();
   fcntl( ..., F_SETFD, FD_CLOEXEC );
   writev();

and I found the last "writev" failed ( perror might say "Invalid
argument" ),
however, when I commented out the "fcntl" line, then it worked fine.

According to the above fact, I doubted the "fcntl" system call in cygwin.dll
but not libX.
But, as you mentioned, it might be a special case occured in (my) ThinkPad.

I will attach the skelton code I used in the test of communication to
Xserver, and I hope this wouldn't violate mailing-list rules.


Thank you for the great job on porting X environments to Windows.

Shu Shimizu

/*-------------------------------------------------------*/
#include <stdio.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <netinet/in.h>

main(int argc, char** argv)
{
    struct sockaddr_in  saddr;
    struct iovec        iov[2];

    /*  create a socket  */
    int s = socket(AF_INET,SOCK_STREAM,0/*IPPROTO_TCP*/);

    int tmp = 1;
    setsockopt (s, IPPROTO_TCP, TCP_NODELAY, (char *) &tmp, sizeof (int));
    setsockopt (s, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (int));

    fprintf(stderr,"socket = %d\n", s);

    bzero(&saddr,0,sizeof(saddr));
    saddr.sin_family      = AF_INET;
    saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    saddr.sin_port        = htons(6000);

    /*  connect to the X server  */
    if (connect(s,(struct sockaddr*)&saddr,sizeof(saddr)) < 0)
perror("connect"), exit(1);

    /*  _X11TransSetOption(trans_conn,TRANS_CLOSEONEXEC,1) does the
following  */
    if (1) {
        int ret = fcntl (s, F_SETFD, FD_CLOEXEC);
        fprintf(stderr,"ret = %d\n", ret);
    }

    /*  meaningless data  */
    iov[0].iov_base = "Hogera";
    iov[0].iov_len  = 6;
    iov[1].iov_base = "Fugo";
    iov[1].iov_len  = 4;

    /*  I would like to see the result from the below operation  */
    writev(s,iov,2);
    perror("writev");   /*  perror reports "writev: Invalid argument",
*/
                        /*  but "writev: error 0" when the fcntl commented
out */

    close(s);

    return 0;
}

/*-------------------------------------------------------*/