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DEV: dev/gdb: add fdtab dump

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Three functions are provided here:
  fd_dump: lists all FDs
  fd_dump_conn: lists all FDs holding a connection
  fd_dump_listener: lists all FDs holding a listener

They take no argument, and dump some of the known info. E.g. for
a connection, ctrl, xprt, flags, mux, sessions, frontend's name
and session's age are reported. Example:

  (gdb) fd_dump_conn
  fd    31: rm=0 tm=0x2 um=0 st=0x21 refc=0x1 tkov=0 gen=0 conn=0x7fffe803b600: flg=0x300 err=0 ctrl=0xdf51c0 xprt=0xdf5c80 mux=0xbaeee0 sess=0x7ffff003b570: fe=0x1e45b00 id=foo age=0ms

They are particularly slow because they iterate over all possible FDs,
so better limit them to the desired types.
This commit is contained in:
Willy Tarreau 2026-05-27 18:51:28 +02:00
parent ca5f6cd053
commit 83634a4c9a
1 changed files with 39 additions and 0 deletions
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39
dev/gdb/fd.gdb Normal file
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# list info about open FD
define fd_dump
set $f = 0
while $f < $g.maxsock
if fdtab[$f].owner != 0
printf "fd %5d: rm=%#lx tm=%#lx um=%#lx cb=%p ownr=%p st=%#x refc=%#x tkov=%u gen=%u\n", $f, fdtab[$f].running_mask, fdtab[$f].thread_mask, fdtab[$f].update_mask, fdtab[$f].iocb, fdtab[$f].owner, fdtab[$f].state, fdtab[$f].refc_tgid, fdtab[$f].nb_takeover, fdtab[$f].generation
end
set $f = $f + 1
end
end
# only those attached to a listener
define fd_dump_listener
set $f = 0
while $f < $g.maxsock
if fdtab[$f].owner != 0 && fdtab[$f].iocb == &sock_accept_iocb
set $c = (struct listener *)fdtab[$f].owner
printf "fd %5d: rm=%#lx tm=%#lx um=%#lx st=%#x refc=%#x tkov=%u gen=%u listener=%p(%s): flg=%#x state=%d fe=%p(%s) acc=%p\n", $f, fdtab[$f].running_mask, fdtab[$f].thread_mask, fdtab[$f].update_mask, fdtab[$f].state, fdtab[$f].refc_tgid, fdtab[$f].nb_takeover, fdtab[$f].generation, fdtab[$f].owner, $c->name, $c->flags, $c->state, $c->bind_conf.frontend, $c->bind_conf.frontend.id, $c->bind_conf.accept
end
set $f = $f + 1
end
end
# only those attached to a connection
define fd_dump_conn
set $f = 0
while $f < $g.maxsock
if fdtab[$f].owner != 0 && fdtab[$f].iocb == &sock_conn_iocb
set $c = (struct connection *)fdtab[$f].owner
printf "fd %5d: rm=%#lx tm=%#lx um=%#lx st=%#x refc=%#x tkov=%u gen=%u conn=%p: flg=%#x err=%#x ctrl=%p xprt=%p mux=%p", $f, fdtab[$f].running_mask, fdtab[$f].thread_mask, fdtab[$f].update_mask, fdtab[$f].state, fdtab[$f].refc_tgid, fdtab[$f].nb_takeover, fdtab[$f].generation, fdtab[$f].owner, $c->flags, $c->err_code, $c->ctrl, $c->xprt, $c->mux
if *$c->target == OBJ_TYPE_LISTENER
set $s = (struct session *)$c->owner
printf " sess=%p: fe=%p id=%s age=%dms", $s, $s->fe, $s->fe->id, (*global_now_ns - $s->accept_ts) / 1000000
end
printf "\n"
end
set $f = $f + 1
end
end