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/>.
25 static struct tdb_print_db *print_db_head;
27 /****************************************************************************
28 Function to find or create the printer specific job tdb given a printername.
29 Limits the number of tdb's open to MAX_PRINT_DBS_OPEN.
30 ****************************************************************************/
32 struct tdb_print_db *get_print_db_byname(const char *printername)
34 struct tdb_print_db *p = NULL, *last_entry = NULL;
36 char *printdb_path = NULL;
37 bool done_become_root = False;
39 SMB_ASSERT(printername != NULL);
41 for (p = print_db_head, last_entry = print_db_head; p; p = p->next) {
42 /* Ensure the list terminates... JRA. */
43 SMB_ASSERT(p->next != print_db_head);
45 if (p->tdb && strequal(p->printer_name, printername)) {
46 DLIST_PROMOTE(print_db_head, p);
55 if (num_open >= MAX_PRINT_DBS_OPEN) {
56 /* Try and recycle the last entry. */
57 if (print_db_head && last_entry) {
58 DLIST_PROMOTE(print_db_head, last_entry);
61 for (p = print_db_head; p; p = p->next) {
65 if (tdb_close(print_db_head->tdb)) {
66 DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
67 print_db_head->printer_name ));
73 memset(p->printer_name, '\0', sizeof(p->printer_name));
76 if (p && print_db_head) {
77 DLIST_PROMOTE(print_db_head, p);
84 p = SMB_MALLOC_P(struct tdb_print_db);
86 DEBUG(0,("get_print_db: malloc fail !\n"));
90 DLIST_ADD(print_db_head, p);
93 if (asprintf(&printdb_path, "%s%s.tdb",
94 lock_path("printing/"),
96 DLIST_REMOVE(print_db_head, p);
101 if (geteuid() != 0) {
103 done_become_root = True;
106 p->tdb = tdb_open_log(printdb_path, 5000, TDB_DEFAULT, O_RDWR|O_CREAT,
109 if (done_become_root)
113 DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
115 DLIST_REMOVE(print_db_head, p);
116 SAFE_FREE(printdb_path);
120 SAFE_FREE(printdb_path);
121 fstrcpy(p->printer_name, printername);
126 /***************************************************************************
127 Remove a reference count.
128 ****************************************************************************/
130 void release_print_db( struct tdb_print_db *pdb)
133 SMB_ASSERT(pdb->ref_count >= 0);
136 /***************************************************************************
137 Close all open print db entries.
138 ****************************************************************************/
140 void close_all_print_db(void)
142 struct tdb_print_db *p = NULL, *next_p = NULL;
144 for (p = print_db_head; p; p = next_p) {
149 DLIST_REMOVE(print_db_head, p);
156 /****************************************************************************
157 Fetch and clean the pid_t record list for all pids interested in notify
158 messages. data needs freeing on exit.
159 ****************************************************************************/
161 TDB_DATA get_printer_notify_pid_list(TDB_CONTEXT *tdb, const char *printer_name, bool cleanlist)
168 data = tdb_fetch_bystring( tdb, NOTIFY_PID_LIST_KEY );
175 if (data.dsize % 8) {
176 DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
177 tdb_delete_bystring(tdb, NOTIFY_PID_LIST_KEY );
178 SAFE_FREE(data.dptr);
187 * Weed out all dead entries.
190 for( i = 0; i < data.dsize; i += 8) {
191 pid_t pid = (pid_t)IVAL(data.dptr, i);
193 if (pid == sys_getpid())
196 /* Entry is dead if process doesn't exist or refcount is zero. */
198 while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists_by_pid(pid))) {
200 /* Refcount == zero is a logic error and should never happen. */
201 if (IVAL(data.dptr, i + 4) == 0) {
202 DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
203 (unsigned int)pid, printer_name ));
206 if (data.dsize - i > 8)
207 memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);