gdb --args mged -o moss.g

warning: Can not parse XML syscalls information; XML support was disabled at compile time.
GNU gdb (Gentoo 7.0 p2) 7.0
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>...
Reading symbols from /usr/brlcad/bin/mged...done.
(gdb) break pkg_getclient
Breakpoint 1 at 0x40e8a0
(gdb) run
Starting program: /usr/brlcad/bin/mged -o moss.g
[Thread debugging using libthread_db enabled]
WARNING: -o is a developer option and subject to change.  Do not use.
WARNING: screen number is [0]
WARNING: screen number is [0]
WARNING: screen number is [0]
WARNING: screen number is [0]

Breakpoint 1, pkg_getclient (fd=0, switchp=0x7fffe76ccb40, 
    errlog=0x7fffe74a6424 <comm_error>, nodelay=0)
    at ../../../brlcad/src/libpkg/pkg.c:719
719         unsigned int fromlen = sizeof (from);
(gdb) up
#1  0x00007fffe74a7a9d in new_client_handler (clientData=0x2a998c8, chan=0x2, 
    host=0x7fffe74a7a50 "UH\211\345H\203\354@H\211}\330H\211u\320H\211U?M\304H\213E\330H\211E\350H\213E\350H\213@\020H\211E\360\307E", <incomplete sequence \374>, port=15044288) at ../../../brlcad/src/libfb/fbserv_obj.c:837
837         new_client(fbsp, pkg_getclient(fd, pswitch, comm_error, 0), 0);
(gdb) print fbsp
$1 = (struct fbserv_obj *) 0x2a998b8
(gdb) print *fbsp
$2 = {fbs_fbp = 0x2b979d0, fbs_interp = 0x72f740, fbs_listener = {
    fbsl_fd = 15, fbsl_port = 0, fbsl_listen = 0, fbsl_fbsp = 0x2a998b8}, 
  fbs_clients = {{fbsc_fd = 0, fbsc_pkg = 0x0, 
      fbsc_fbsp = 0x0} <repeats 32 times>}, 
  fbs_callback = 0x7fffe69dd862 <go_fbs_callback>, fbs_clientData = 0x2a99870, 
  fbs_mode = 1}
(gdb) print fd
$3 = 0
(gdb) print pswitch
$4 = {{pks_type = 1, pks_handler = 0x7fffe74a693a <fbs_rfbopen>, 
    pks_title = 0x7fffe74c31fa "Open Framebuffer"}, {pks_type = 2, 
    pks_handler = 0x7fffe74a6a0e <fbs_rfbclose>, 
    pks_title = 0x7fffe74c320b "Close Framebuffer"}, {pks_type = 3, 
    pks_handler = 0x7fffe74a6aab <fbs_rfbclear>, 
    pks_title = 0x7fffe74c321d "Clear Framebuffer"}, {pks_type = 4, 
    pks_handler = 0x7fffe74a6b2e <fbs_rfbread>, 
    pks_title = 0x7fffe74c322f "Read Pixels"}, {pks_type = 5, 
    pks_handler = 0x7fffe74a6c8f <fbs_rfbwrite>, 
    pks_title = 0x7fffe74c323b "Write Pixels"}, {pks_type = 105, 
    pks_handler = 0x7fffe74a6c8f <fbs_rfbwrite>, 
    pks_title = 0x7fffe74c3248 "Asynch write"}, {pks_type = 6, 
    pks_handler = 0x7fffe74a71be <fbs_rfbcursor>, 
    pks_title = 0x7fffe74c3255 "Cursor"}, {pks_type = 19, 
    pks_handler = 0x7fffe74a724c <fbs_rfbgetcursor>, 
    pks_title = 0x7fffe74c325c "Get Cursor"}, {pks_type = 9, 
    pks_handler = 0x7fffe74a73bc <fbs_rfbscursor>, 
    pks_title = 0x7fffe74c3267 "Screen Cursor"}, {pks_type = 7, 
    pks_handler = 0x7fffe74a7442 <fbs_rfbwindow>, 
    pks_title = 0x7fffe74c3275 "Window"}, {pks_type = 8, 
    pks_handler = 0x7fffe74a74b5 <fbs_rfbzoom>, 
    pks_title = 0x7fffe74c327c "Zoom"}, {pks_type = 10, 
    pks_handler = 0x7fffe74a7528 <fbs_rfbview>, 
---Type <return> to continue, or q <return> to quit---
    pks_title = 0x7fffe74c3281 "View"}, {pks_type = 11, 
    pks_handler = 0x7fffe74a75d3 <fbs_rfbgetview>, 
    pks_title = 0x7fffe74c3286 "Get View"}, {pks_type = 12, 
    pks_handler = 0x7fffe74a7692 <fbs_rfbrmap>, 
    pks_title = 0x7fffe74c328f "R Map"}, {pks_type = 13, 
    pks_handler = 0x7fffe74a77e4 <fbs_rfbwmap>, 
    pks_title = 0x7fffe74c3295 "W Map"}, {pks_type = 14, 
    pks_handler = 0x7fffe74a79e4 <fbs_rfbhelp>, 
    pks_title = 0x7fffe74c329b "Help Request"}, {pks_type = 23, 
    pks_handler = 0x7fffe74a6903 <fbs_rfbunknown>, 
    pks_title = 0x7fffe74c32a8 "Error Message"}, {pks_type = 22, 
    pks_handler = 0x7fffe74a6903 <fbs_rfbunknown>, 
    pks_title = 0x7fffe74c32b6 "Close Connection"}, {pks_type = 15, 
    pks_handler = 0x7fffe74a6d43 <fbs_rfbreadrect>, 
    pks_title = 0x7fffe74c32c7 "Read Rectangle"}, {pks_type = 16, 
    pks_handler = 0x7fffe74a6ec8 <fbs_rfbwriterect>, 
    pks_title = 0x7fffe74c32d6 "Write Rectangle"}, {pks_type = 116, 
    pks_handler = 0x7fffe74a6ec8 <fbs_rfbwriterect>, 
    pks_title = 0x7fffe74c32d6 "Write Rectangle"}, {pks_type = 32, 
    pks_handler = 0x7fffe74a6f95 <fbs_rfbbwreadrect>, 
    pks_title = 0x7fffe74c32e6 "Read BW Rectangle"}, {pks_type = 33, 
    pks_handler = 0x7fffe74a70f1 <fbs_rfbbwwriterect>, 
    pks_title = 0x7fffe74c32f8 "Write BW Rectangle"}, {pks_type = 133, 
---Type <return> to continue, or q <return> to quit---
    pks_handler = 0x7fffe74a70f1 <fbs_rfbbwwriterect>, 
    pks_title = 0x7fffe74c32f8 "Write BW Rectangle"}, {pks_type = 17, 
    pks_handler = 0x7fffe74a793f <fbs_rfbflush>, 
    pks_title = 0x7fffe74c330b "Flush Output"}, {pks_type = 117, 
    pks_handler = 0x7fffe74a793f <fbs_rfbflush>, 
    pks_title = 0x7fffe74c330b "Flush Output"}, {pks_type = 18, 
    pks_handler = 0x7fffe74a6a61 <fbs_rfbfree>, 
    pks_title = 0x7fffe74c3318 "Free Resources"}, {pks_type = 30, 
    pks_handler = 0x7fffe74a79a4 <fbs_rfbpoll>, 
    pks_title = 0x7fffe74c3327 "Handle Events"}, {pks_type = 31, 
    pks_handler = 0x7fffe74a72f0 <fbs_rfbsetcursor>, 
    pks_title = 0x7fffe74c3335 "Set Cursor Shape"}, {pks_type = 131, 
    pks_handler = 0x7fffe74a72f0 <fbs_rfbsetcursor>, 
    pks_title = 0x7fffe74c3335 "Set Cursor Shape"}, {pks_type = 0, 
    pks_handler = 0, pks_title = 0x0}}
(gdb) print comm_error
$5 = {void (char *)} 0x7fffe74a6424 <comm_error>
(gdb) print *comm_error
$6 = {void (char *)} 0x7fffe74a6424 <comm_error>
(gdb) print (char *)comm_error
$7 = 0x7fffe74a6424 "UH\211\345H\203\354\020H\211}\370H\213u\370H\215=u\314\001"
(gdb) down
#0  pkg_getclient (fd=0, switchp=0x7fffe76ccb40, 
    errlog=0x7fffe74a6424 <comm_error>, nodelay=0)
    at ../../../brlcad/src/libpkg/pkg.c:719
719         unsigned int fromlen = sizeof (from);
(gdb) print from
$8 = {sin_family = 0, sin_port = 0, sin_addr = {s_addr = 0}, 
  sin_zero = "\210,\217\000\000\000\000"}
(gdb) n
722         if (_pkg_debug) {
(gdb) 
731         if (errlog == NULL)
(gdb) 
735         if (nodelay) {
(gdb) 
754             s2 = accept(fd, (struct sockaddr *)&from, &fromlen);
(gdb) print fd
$9 = 0
(gdb) print (struct sockaddr *)&from
$10 = (struct sockaddr *) 0x7fffffffcfa0
(gdb) print *(struct sockaddr *)&from
$11 = {sa_family = 0, 
  sa_data = "\000\000\000\000\000\000\210,\217\000\000\000\000"}
(gdb) print &fromlen
$12 = (unsigned int *) 0x7fffffffcf98
(gdb) print fromlen
$13 = 16
(gdb) n
756             if (s2 < 0) {
(gdb) n
757                 if (errno == EINTR)
(gdb) print s2
$14 = -1
(gdb) q