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# gdb macros which may be useful for folks using gdb to debug
# apache. Delete it if it bothers you.
define dump_table
set $t = (apr_table_entry_t *)((apr_array_header_t *)$arg0)->elts
set $n = ((apr_array_header_t *)$arg0)->nelts
set $i = 0
while $i < $n
if $t[$i].val == (void *)0L
printf "[%u] '%s'=>NULL\n", $i, $t[$i].key
else
printf "[%u] '%s'='%s' [%p]\n", $i, $t[$i].key, $t[$i].val, $t[$i].val
end
set $i = $i + 1
end
end
document dump_table
Print the key/value pairs in a table.
end
define dump_skiplist
set $sl = (apr_skiplist *)$arg0
set $m = $sl->bottom
printf "skiplist@%p: size=%lu: height=%d\n", $sl, $sl->size, $sl->height
while ($m)
printf "(%p,%.12lx)", $m, $m->data
set $u = $m->up
while ($u)
printf " (%p,%.12lx)", $u, $u->data
set $u = $u->up
end
printf "\n"
set $m = $m->next
end
end
document dump_skiplist
Print the nodes/values in a skiplist
end
define dump_string_hash
set $h = $arg0->array
set $n = $arg0->max
set $i = 0
while $i < $n
set $ent = $h[$i]
while $ent != (void *)0L
printf "'%s' => '%p'\n", $ent->key, $ent->val
set $ent = $ent->next
end
set $i = $i + 1
end
end
document dump_string_hash
Print the entries in a hash table indexed by strings
end
define dump_string_shash
set $h = $arg0->array
set $n = $arg0->max
set $i = 0
while $i < $n
set $ent = $h[$i]
while $ent != (void *)0L
printf "'%s' => '%s'\n", $ent->key, $ent->val
set $ent = $ent->next
end
set $i = $i + 1
end
end
document dump_string_shash
Print the entries in a hash table indexed by strings with string values
end
define ro
run -DONE_PROCESS
end
define dump_string_array
set $a = (char **)((apr_array_header_t *)$arg0)->elts
set $n = (int)((apr_array_header_t *)$arg0)->nelts
set $i = 0
while $i < $n
printf "[%u] '%s'\n", $i, $a[$i]
set $i = $i + 1
end
end
document dump_string_array
Print all of the elements in an array of strings.
end
define printmemn
set $i = 0
while $i < $arg1
if $arg0[$i] < 0x20 || $arg0[$i] > 0x7e
printf "~"
else
printf "%c", $arg0[$i]
end
set $i = $i + 1
end
end
define print_bkt_datacol
# arg0 == column name
# arg1 == format
# arg2 == value
# arg3 == suppress header?
set $suppressheader = $arg3
if !$suppressheader
printf " "
printf $arg0
printf "="
else
printf " | "
end
printf $arg1, $arg2
end
define dump_bucket_ex
# arg0 == bucket
# arg1 == suppress header?
set $bucket = (struct apr_bucket *)$arg0
set $sh = $arg1
set $refcount = -1
print_bkt_datacol "bucket" "%-9s" $bucket->type->name $sh
printf "(%12lx)", (unsigned long)$bucket
print_bkt_datacol "length" "%-6ld" (long)($bucket->length) $sh
print_bkt_datacol "data" "%12lx" $bucket->data $sh
if !$sh
printf "\n "
end
if (($bucket->type == &apr_bucket_type_eos) || \
($bucket->type == &apr_bucket_type_flush))
# metadata buckets, no content
print_bkt_datacol "contents" "%c" ' ' $sh
printf " "
print_bkt_datacol "rc" "n/%c" 'a' $sh
else
if ($bucket->type == &ap_bucket_type_error)
# metadata bucket, no content but it does have an error code in it
print_bkt_datacol "contents" "%c" ' ' $sh
set $status = ((ap_bucket_error *)$bucket->data)->status
printf " (status=%3d) ", $status
print_bkt_datacol "rc" "n/%c" 'a' $sh
else
if ($bucket->type == &apr_bucket_type_file)
# file bucket, can show fd and refcount
set $fd = ((apr_bucket_file*)$bucket->data)->fd->filedes
print_bkt_datacol "contents" "[***file***] fd=%-6ld" (long)$fd $sh
set $refcount = ((apr_bucket_refcount *)$bucket->data)->refcount
print_bkt_datacol "rc" "%-3d" $refcount $sh
else
if (($bucket->type == &apr_bucket_type_heap) || \
($bucket->type == &apr_bucket_type_pool) || \
($bucket->type == &apr_bucket_type_mmap) || \
($bucket->type == &apr_bucket_type_transient) || \
($bucket->type == &apr_bucket_type_immortal))
# in-memory buckets
if $bucket->type == &apr_bucket_type_heap
set $refcount = ((apr_bucket_refcount *)$bucket->data)->refcount
set $p = (apr_bucket_heap *)$bucket->data
set $data = $p->base+$bucket->start
else
if $bucket->type == &apr_bucket_type_pool
set $refcount = ((apr_bucket_refcount *)$bucket->data)->refcount
set $p = (apr_bucket_pool *)$bucket->data
if !$p->pool
set $p = (apr_bucket_heap *)$bucket->data
end
set $data = $p->base+$bucket->start
else
if $bucket->type == &apr_bucket_type_mmap
# is this safe if not APR_HAS_MMAP?
set $refcount = ((apr_bucket_refcount *)$bucket->data)->refcount
set $p = (apr_bucket_mmap *)$bucket->data
set $data = ((char *)$p->mmap->mm)+$bucket->start
else
if (($bucket->type == &apr_bucket_type_transient) || \
($bucket->type == &apr_bucket_type_immortal))
set $data = ((char *)$bucket->data)+$bucket->start
end
end
end
end
if $sh
printf " | ["
else
printf " contents=["
end
set $datalen = $bucket->length
if $isValidAddress($data) == 1
if $datalen > 17
printmem $data 17
printf "..."
set $datalen = 20
else
printmemn $data $datalen
end
printf "]"
while $datalen < 20
printf " "
set $datalen = $datalen + 1
end
else
printf "Iv addr %12lx]", $data
end
if $refcount != -1
print_bkt_datacol "rc" "%-3d" $refcount $sh
else
print_bkt_datacol "rc" "n/%c" 'a' $sh
end
else
if ($bucket->type == &apr_bucket_type_pipe)
# pipe bucket, can show fd
set $fd = ((apr_file_t*)$bucket->data)->filedes
print_bkt_datacol "contents" "[***pipe***] fd=%-3ld" (long)$fd $sh
else
if ($bucket->type == &apr_bucket_type_socket)
# file bucket, can show fd
set $fd = ((apr_socket_t*)$bucket->data)->socketdes
print_bkt_datacol "contents" "[**socket**] fd=%-3ld" (long)$fd $sh
else
# 3rd-party bucket type
print_bkt_datacol "contents" "[**opaque**]%-7c" ' ' $sh
end
end
# no refcount
printf " "
print_bkt_datacol "rc" "n/%c" 'a' $sh
end
end
end
end
printf "\n"
end
define dump_bucket
dump_bucket_ex $arg0 0
end
document dump_bucket
Print bucket info
end
define dump_brigade
set $bb = (apr_bucket_brigade *)$arg0
set $bucket = $bb->list.next
set $sentinel = ((char *)((&($bb->list)) \
- ((size_t) &((struct apr_bucket *)0)->link)))
printf "dump of brigade 0x%lx\n", (unsigned long)$bb
printf " | type (address) | length | "
printf "data address | contents | rc\n"
printf "-------------------------------------------"
printf "----------------------------------------\n"
if $bucket == $sentinel
printf "brigade is empty\n"
end
set $j = 0
set $brigade_length = 0
while $bucket != $sentinel
printf "%2d", $j
dump_bucket_ex $bucket 1
set $j = $j + 1
if $bucket->length > 0
set $brigade_length = $brigade_length + $bucket->length
end
set $bucket = $bucket->link.next
end
printf "end of brigade\n"
printf "Length of brigade (excluding buckets of unknown length): %u\n", $brigade_length
end
document dump_brigade
Print bucket brigade info
end
define dump_filters
set $f = $arg0
while $f
printf "%s(0x%lx): ctx=0x%lx, r=0x%lx, c=0x%lx\n", \
$f->frec->name, (unsigned long)$f, (unsigned long)$f->ctx, \
$f->r, $f->c
set $f = $f->next
end
end
document dump_filters
Print filter chain info
end
define dump_filter_chain
set $r = $arg0
set $f = $r->output_filters
while $f
if $f == $r->output_filters
printf "r->output_filters =>\n"
end
if $f == $r->proto_output_filters
printf "r->proto_output_filters =>\n"
end
if $f == $r->connection->output_filters
printf "r->connection->output_filters =>\n"
end
printf " %s(0x%lx): type=%d, ctx=0x%lx, r=%s(0x%lx), c=0x%lx\n", \
$f->frec->name, (unsigned long)$f, $f->frec->ftype, (unsigned long)$f->ctx, \
$f->r == $r ? "r" : ($f->r == 0L ? "null" : \
($f->r == $r->main ? "r->main" : \
($r->main && $f->r == $r->main->main ? "r->main->main" : "????"))), \
$f->r, $f->c
set $f = $f->next
end
end
document dump_filter_chain
Print filter chain info given a request_rec pointer
end
define dump_process_rec
set $p = $arg0
printf "process_rec=0x%lx:\n", (unsigned long)$p
printf " pool=0x%lx, pconf=0x%lx\n", \
(unsigned long)$p->pool, (unsigned long)$p->pconf
end
document dump_process_rec
Print process_rec info
end
define dump_server_addr_recs
set $sa_ = $arg0
set $san_ = 0
while $sa_
### need to call apr_sockaddr_info_getbuf to print ->host_addr properly
### which is a PITA since we need a buffer :(
printf " addr#%d: vhost=%s -> :%d\n", $san_++, $sa_->virthost, $sa_->host_port
set $sa_ = $sa_->next
end
end
document dump_server_addr_recs
Print server_addr_rec info
end
define dump_server_rec
set $s = $arg0
printf "name=%s:%d (0x%lx)\n", \
$s->server_hostname, $s->port, $s
dump_server_addr_recs $s->addrs
dump_process_rec($s->process)
end
document dump_server_rec
Print server_rec info
end
define dump_servers
set $s = $arg0
while $s
dump_server_rec($s)
printf "\n"
set $s = $s->next
end
end
document dump_servers
Print server_rec list info
end
define dump_request_tree
set $r = $arg0
set $i
while $r
printf "r=(0x%lx): uri=%s, handler=%s, r->main=0x%lx\n", \
$r, $r->unparsed_uri, $r->handler ? $r->handler : "(none)", $r->main
set $r = $r->main
end
end
define dump_scoreboard
# Need to reserve size of array first before string literals could be
# put in
set $status = {0, 1, 2, 3, 4 ,5 ,6 ,7 ,8 ,9 ,10}
set $status = {"DEAD", "STARTING", "READY", "BUSY_READ", "BUSY_WRITE", "BUSY_KEEPALIVE", "BUSY_LOG", "BUSY_DNS", "CLOSING", "GRACEFUL", "IDLE_KILL"}
set $i = 0
while ($i < server_limit)
if ap_scoreboard_image->servers[$i][0].pid != 0
set $j = 0
while ($j < threads_per_child)
set $ws = ap_scoreboard_image->servers[$i][$j]
printf "pid: %d, tid: 0x%lx, status: %s\n", $ws.pid, $ws.tid, $status[$ws.status]
set $j = $j +1
end
end
set $i = $i +1
end
end
document dump_scoreboard
Dump the scoreboard
end
define dump_allocator
printf "Allocator current_free_index = %d, max_free_index = %d\n", \
($arg0)->current_free_index, ($arg0)->max_free_index
printf "Allocator free list:\n"
set $i = 0
set $max =(sizeof $arg0->free)/(sizeof $arg0->free[0])
set $kb = 0
while $i < $max
set $node = $arg0->free[$i]
if $node != 0
printf " #%2d: ", $i
while $node != 0
printf "%d, ", ($node->index + 1) << 12
set $kb = $kb + (($node->index + 1) << 2)
set $node = $node->next
end
printf "ends.\n"
end
set $i = $i + 1
end
printf "Sum of free blocks: %dkiB\n", $kb
end
document dump_allocator
Print status of an allocator and its freelists.
end
define dump_one_pool
set $p = $arg0
set $size = 0
set $free = 0
set $nodes = 0
set $node = $arg0->active
set $done = 0
while $done == 0
set $size = $size + (($node->index + 1) << 12)
set $free = $free + ($node->endp - $node->first_avail)
set $nodes = $nodes + 1
set $node = $node->next
if $node == $arg0->active
set $done = 1
end
end
printf "Pool '"
if $p->tag
printf "%s", $p->tag
else
printf "no tag"
end
printf "' [%p]: %d/%d free (%d blocks)\n", $p, $free, $size, $nodes
end
define dump_all_pools
if $argc > 0
set $root = $arg0
else
set $root = ap_pglobal
end
while $root->parent
set $root = $root->parent
end
dump_pool_and_children $root
end
document dump_all_pools
Dump the whole pool hierarchy starting from apr_global_pool. Optionally takes an arbitrary pool as starting parameter.
end
python
from __future__ import print_function
class DumpPoolAndChilds (gdb.Command):
"""Dump the whole pool hierarchy starting from the given pool."""
def __init__ (self):
super (DumpPoolAndChilds, self).__init__ ("dump_pool_and_children", gdb.COMMAND_USER)
def _allocator_free_blocks(self, alloc):
salloc = "%s" % (alloc)
if self.total_free_blocks.get(salloc) != None:
return self.total_free_blocks[salloc]
i = 0
dalloc = alloc.dereference()
max =(dalloc['free'].type.sizeof)/(dalloc['free'][0].type.sizeof)
kb = 0
while i < max:
node = dalloc['free'][i]
if node != 0:
while node != 0:
noded = node.dereference()
kb = kb + ((int(noded['index']) + 1) << 2)
node = noded['next']
i = i + 1
self.total_free_blocks[salloc] = kb
return kb
def _dump_one_pool(self, arg):
size = 0
free = 0
nodes = 0
darg = arg.dereference()
active = darg['active']
node = active
done = 0
while done == 0:
noded = node.dereference()
size = size + ((int(noded['index']) + 1) << 12)
free = free + (noded['endp'] - noded['first_avail'])
nodes = nodes + 1
node = noded['next']
if node == active:
done = 1
if darg['tag'] != 0:
tag = darg['tag'].string()
else:
tag = "No tag"
print("Pool '%s' [%s]: %d/%d free (%d blocks) allocator: %s free blocks in allocator: %i kiB" % (tag, arg, free, size, nodes, darg['allocator'], self._allocator_free_blocks(darg['allocator'])))
self.free = self.free + free
self.size = self.size + size
self.nodes = self.nodes + nodes
def _dump(self, arg, depth):
pool = arg
while pool:
print("%*c" % (depth * 4 + 1, " "), end="")
self._dump_one_pool(pool)
if pool['child'] != 0:
self._dump(pool['child'], depth + 1)
pool = pool['sibling']
def invoke (self, arg, from_tty):
pool = gdb.parse_and_eval(arg)
self.free = 0
self.size = 0
self.nodes = 0
self.total_free_blocks = {}
self._dump(pool, 0)
print("Total %d/%d free (%d blocks)" % (self.free, self.size, self.nodes))
sum = 0
for key in self.total_free_blocks:
sum = sum + self.total_free_blocks[key]
print("Total free allocator blocks: %i kiB" % (sum))
DumpPoolAndChilds ()
end
document dump_pool_and_children
Dump the whole pool hierarchy starting from the given pool.
end
python
class isValidAddress (gdb.Function):
"""Determines if the argument is a valid address."""
def __init__(self):
super(isValidAddress, self).__init__("isValidAddress")
def invoke(self, address):
inf = gdb.inferiors()[0]
result = 1
try:
inf.read_memory(address, 8)
except:
result = 0
return result
isValidAddress()
end
# Set sane defaults for common signals:
handle SIGPIPE noprint pass nostop
handle SIGUSR1 print pass nostop
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