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Date:      Sat, 9 Jan 1999 14:41:29 -0500 (EST)
From:      Brian Feldman <green@unixhelp.org>
To:        Kenneth Wayne Culver <culverk@wam.umd.edu>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: USER_LDT in Linux emulation
Message-ID:  <Pine.BSF.4.05.9901091439450.304-100000@janus.syracuse.net>
In-Reply-To: <Pine.BSF.4.05.9901091424580.304-100000@janus.syracuse.net>
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Whoops, didn't include the sendmsg() weirdness I need a bit of help with.

{"/home/green/wine-990103"}$ ./wine
socket: 3
struct msghdr:
msg_name = (nil)
msg_namelen = 0
msg_iov = 0xefbfd6e8
msg_iovlen = 2
msg_control = 0xefbfd6b0
msg_controllen = 16
msg_flags = 0
msghdr.msg_iov[0].iov_base = 0xefbfd688
msghdr.msg_iov[0].iov_len = 12
msghdr.msg_iov[1].iov_base = 0xefbfd790
msghdr.msg_iov[1].iov_len = 4
sendmsg: Invalid argument
Client protocol error:(nil): partial msg sent -1/16
Memory fault (core dumped) 
{"/home/green/wine-990103"}$ 

Relevant code:
LIENT_SendRequest_v
 *
 * Send a request to the server.
 */
static void CLIENT_SendRequest_v( enum request req, int pass_fd,
                                  struct iovec *vec, int veclen )
{
    THDB *thdb = THREAD_Current();
#ifndef HAVE_MSGHDR_ACCRIGHTS
    struct cmsg_fd cmsg  = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, pass_fd };
#endif
    struct msghdr msghdr = { NULL, 0, vec, veclen, NULL, 0, 0};
    struct header head;
    int i, ret, len;

    assert( veclen > 0 );
    vec[0].iov_base = &head;
    vec[0].iov_len  = sizeof(head);
    for (i = len = 0; i < veclen; i++) len += vec[i].iov_len;

    assert( len <= MAX_MSG_LENGTH );
    head.type = req;
    head.len  = len;
    head.seq  = thdb->seq++;

    if (pass_fd != -1)  /* we have an fd to send */
    {
#ifdef HAVE_MSGHDR_ACCRIGHTS
        msghdr.msg_accrights = (void *)&pass_fd;
        msghdr.msg_accrightslen = sizeof(pass_fd);
#else
        msghdr.msg_control    = &cmsg;
        msghdr.msg_controllen = sizeof(cmsg);
#endif
    }

    printf("socket: %d\n"
        "struct msghdr:\n"
        "msg_name = %p\n"
        "msg_namelen = %d\n"
        "msg_iov = %p\n"
        "msg_iovlen = %d\n"
        "msg_control = %p\n"
        "msg_controllen = %d\n"
        "msg_flags = %d\n", thdb->socket, msghdr.msg_name, msghdr.msg_namelen,
        msghdr.msg_iov, msghdr.msg_iovlen, msghdr.msg_control,
        msghdr.msg_controllen, msghdr.msg_flags);

        {
        register struct iovec *iov = msghdr.msg_iov;
        int c;

        for (c = 0; c < msghdr.msg_iovlen; c++)
                printf("msghdr.msg_iov[%d].iov_base = %p\n"
                        "msghdr.msg_iov[%d].iov_len = %d\n", c, iov[c].iov_base,
                        c, iov[c].iov_len);

        }
    if ((ret = sendmsg( thdb->socket, &msghdr, 0 )) < len)
    {
        if (ret == -1) perror( "sendmsg" );
        CLIENT_ProtocolError( "partial msg sent %d/%d\n", ret, len );
    }
    /* we passed the fd now we can close it */
    if (pass_fd != -1) close( pass_fd );
}



 Brian Feldman						  _ __  ___ ___ ___  
 green@unixhelp.org				      _ __ ___ | _ ) __|   \ 
		      http://www.freebsd.org/	 _ __ ___ ____ | _ \__ \ |) |
 FreeBSD: The Power to Serve!		   _ __ ___ ____ _____ |___/___/___/ 


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