2 Unix SMB/Netbios implementation.
4 printing backend routines
5 Copyright (C) Andrew Tridgell 1992-2000
6 Copyright (C) Jeremy Allison 2002
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "system/filesys.h"
26 static struct tdb_print_db
*print_db_head
;
28 /****************************************************************************
29 Function to find or create the printer specific job tdb given a printername.
30 Limits the number of tdb's open to MAX_PRINT_DBS_OPEN.
31 ****************************************************************************/
33 struct tdb_print_db
*get_print_db_byname(const char *printername
)
35 struct tdb_print_db
*p
= NULL
, *last_entry
= NULL
;
37 char *printdb_path
= NULL
;
38 bool done_become_root
= False
;
40 SMB_ASSERT(printername
!= NULL
);
42 for (p
= print_db_head
, last_entry
= print_db_head
; p
; p
= p
->next
) {
43 /* Ensure the list terminates... JRA. */
44 SMB_ASSERT(p
->next
!= print_db_head
);
46 if (p
->tdb
&& strequal(p
->printer_name
, printername
)) {
47 DLIST_PROMOTE(print_db_head
, p
);
56 if (num_open
>= MAX_PRINT_DBS_OPEN
) {
57 /* Try and recycle the last entry. */
58 if (print_db_head
&& last_entry
) {
59 DLIST_PROMOTE(print_db_head
, last_entry
);
62 for (p
= print_db_head
; p
; p
= p
->next
) {
66 if (tdb_close(print_db_head
->tdb
)) {
67 DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
68 print_db_head
->printer_name
));
74 memset(p
->printer_name
, '\0', sizeof(p
->printer_name
));
77 if (p
&& print_db_head
) {
78 DLIST_PROMOTE(print_db_head
, p
);
85 p
= SMB_MALLOC_P(struct tdb_print_db
);
87 DEBUG(0,("get_print_db: malloc fail !\n"));
91 DLIST_ADD(print_db_head
, p
);
94 if (asprintf(&printdb_path
, "%s%s.tdb",
95 cache_path("printing/"),
97 DLIST_REMOVE(print_db_head
, p
);
102 if (geteuid() != sec_initial_uid()) {
104 done_become_root
= True
;
107 p
->tdb
= tdb_open_log(printdb_path
, 5000, TDB_DEFAULT
, O_RDWR
|O_CREAT
,
110 if (done_become_root
)
114 DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
116 DLIST_REMOVE(print_db_head
, p
);
117 SAFE_FREE(printdb_path
);
121 SAFE_FREE(printdb_path
);
122 fstrcpy(p
->printer_name
, printername
);
127 /***************************************************************************
128 Remove a reference count.
129 ****************************************************************************/
131 void release_print_db( struct tdb_print_db
*pdb
)
134 SMB_ASSERT(pdb
->ref_count
>= 0);
137 /***************************************************************************
138 Close all open print db entries.
139 ****************************************************************************/
141 void close_all_print_db(void)
143 struct tdb_print_db
*p
= NULL
, *next_p
= NULL
;
145 for (p
= print_db_head
; p
; p
= next_p
) {
150 DLIST_REMOVE(print_db_head
, p
);
157 /****************************************************************************
158 Fetch and clean the pid_t record list for all pids interested in notify
159 messages. data needs freeing on exit.
160 ****************************************************************************/
162 TDB_DATA
get_printer_notify_pid_list(TDB_CONTEXT
*tdb
, const char *printer_name
, bool cleanlist
)
169 data
= tdb_fetch_bystring( tdb
, NOTIFY_PID_LIST_KEY
);
176 if (data
.dsize
% 8) {
177 DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name
));
178 tdb_delete_bystring(tdb
, NOTIFY_PID_LIST_KEY
);
179 SAFE_FREE(data
.dptr
);
188 * Weed out all dead entries.
191 for( i
= 0; i
< data
.dsize
; i
+= 8) {
192 pid_t pid
= (pid_t
)IVAL(data
.dptr
, i
);
194 if (pid
== sys_getpid())
197 /* Entry is dead if process doesn't exist or refcount is zero. */
199 while ((i
< data
.dsize
) && ((IVAL(data
.dptr
, i
+ 4) == 0) || !process_exists_by_pid(pid
))) {
201 /* Refcount == zero is a logic error and should never happen. */
202 if (IVAL(data
.dptr
, i
+ 4) == 0) {
203 DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
204 (unsigned int)pid
, printer_name
));
207 if (data
.dsize
- i
> 8)
208 memmove( &data
.dptr
[i
], &data
.dptr
[i
+8], data
.dsize
- i
- 8);