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, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;
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 pstrcpy(printdb_path, lock_path("printing/"));
95 pstrcat(printdb_path, printername);
96 pstrcat(printdb_path, ".tdb");
100 done_become_root = True;
103 p->tdb = tdb_open_log(printdb_path, 5000, TDB_DEFAULT, O_RDWR|O_CREAT,
106 if (done_become_root)
110 DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
112 DLIST_REMOVE(print_db_head, p);
116 fstrcpy(p->printer_name, printername);
121 /***************************************************************************
122 Remove a reference count.
123 ****************************************************************************/
125 void release_print_db( struct tdb_print_db *pdb)
128 SMB_ASSERT(pdb->ref_count >= 0);
131 /***************************************************************************
132 Close all open print db entries.
133 ****************************************************************************/
135 void close_all_print_db(void)
137 struct tdb_print_db *p = NULL, *next_p = NULL;
139 for (p = print_db_head; p; p = next_p) {
144 DLIST_REMOVE(print_db_head, p);
151 /****************************************************************************
152 Fetch and clean the pid_t record list for all pids interested in notify
153 messages. data needs freeing on exit.
154 ****************************************************************************/
156 TDB_DATA get_printer_notify_pid_list(TDB_CONTEXT *tdb, const char *printer_name, BOOL cleanlist)
163 data = tdb_fetch_bystring( tdb, NOTIFY_PID_LIST_KEY );
170 if (data.dsize % 8) {
171 DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
172 tdb_delete_bystring(tdb, NOTIFY_PID_LIST_KEY );
173 SAFE_FREE(data.dptr);
182 * Weed out all dead entries.
185 for( i = 0; i < data.dsize; i += 8) {
186 pid_t pid = (pid_t)IVAL(data.dptr, i);
188 if (pid == sys_getpid())
191 /* Entry is dead if process doesn't exist or refcount is zero. */
193 while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists_by_pid(pid))) {
195 /* Refcount == zero is a logic error and should never happen. */
196 if (IVAL(data.dptr, i + 4) == 0) {
197 DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
198 (unsigned int)pid, printer_name ));
201 if (data.dsize - i > 8)
202 memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);