kern/125940: connect(2) returning -1, errno unset

[Kian Mohageri]

>Number:         125940
>Category:       kern
>Synopsis:       connect(2) returning -1, errno unset
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 24 21:30:02 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Kian Mohageri
>Release:        FreeBSD 7.0-RELEASE-p3 i386
>Organization:
>Environment:
System: FreeBSD dev.housing.wwu.edu 7.0-RELEASE-p3 FreeBSD 7.0-RELEASE-p3 #0: Mon Jul 14 18:32:03 PDT 2008 root at dev.housing.wwu.edu:/usr/obj/usr/src/sys/GENERIC i386


	
>Description:

Using FreeTDS 0.82 I ran into this issue.  For some reason, the connection is failing (not sure why still).  connect(2) is returning -1 to indicate failure, but errno is unset.

The relevant code from freetds-0.82 follows:

    retval = connect(tds->s, (struct sockaddr *) &sin, sizeof(sin));
    if (retval == 0) {
        tdsdump_log(TDS_DBG_INFO2, "connection established\n");
    } else {
        tdsdump_log(TDS_DBG_ERROR, "tds_open_socket: connect(2) returned \"%s\"\n",        strerror(sock_errno));

Debugging this further shows that retval is -1, but sock_errno (errno) is set to 0.  Setting it to an arbitrary value prior to connect(2) reveals that it isn't touched at all after the failed connect(2).

>How-To-Repeat:

Not entirely sure how to repeat it in a more generic environment.  This specific case is happening with php5-pdo_dblib, freetds-0.64 or freetds-0.82, and PHP via the command line.

>Fix:

	


>Release-Note:
>Audit-Trail:
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