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 2 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.
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;
37 BOOL done_become_root = False;
39 for (p = print_db_head, last_entry = print_db_head; p; p = p->next) {
40 /* Ensure the list terminates... JRA. */
41 SMB_ASSERT(p->next != print_db_head);
43 if (p->tdb && strequal(p->printer_name, printername)) {
44 DLIST_PROMOTE(print_db_head, p);
53 if (num_open >= MAX_PRINT_DBS_OPEN) {
54 /* Try and recycle the last entry. */
55 DLIST_PROMOTE(print_db_head, last_entry);
57 for (p = print_db_head; p; p = p->next) {
61 if (tdb_close(print_db_head->tdb)) {
62 DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
63 print_db_head->printer_name ));
69 memset(p->printer_name, '\0', sizeof(p->printer_name));
73 DLIST_PROMOTE(print_db_head, p);
80 p = (struct tdb_print_db *)malloc(sizeof(struct tdb_print_db));
82 DEBUG(0,("get_print_db: malloc fail !\n"));
86 DLIST_ADD(print_db_head, p);
89 pstrcpy(printdb_path, lock_path("printing/"));
90 pstrcat(printdb_path, printername);
91 pstrcat(printdb_path, ".tdb");
95 done_become_root = True;
98 p->tdb = tdb_open_log(printdb_path, 5000, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
100 if (done_become_root)
104 DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
106 DLIST_REMOVE(print_db_head, p);
110 fstrcpy(p->printer_name, printername);
115 /***************************************************************************
116 Remove a reference count.
117 ****************************************************************************/
119 void release_print_db( struct tdb_print_db *pdb)
122 SMB_ASSERT(pdb->ref_count >= 0);
125 /***************************************************************************
126 Close all open print db entries.
127 ****************************************************************************/
129 void close_all_print_db(void)
131 struct tdb_print_db *p = NULL, *next_p = NULL;
133 for (p = print_db_head; p; p = next_p) {
138 DLIST_REMOVE(print_db_head, p);
145 /****************************************************************************
146 Fetch and clean the pid_t record list for all pids interested in notify
147 messages. data needs freeing on exit.
148 ****************************************************************************/
150 TDB_DATA get_printer_notify_pid_list(TDB_CONTEXT *tdb, const char *printer_name, BOOL cleanlist)
157 data = tdb_fetch_bystring( tdb, NOTIFY_PID_LIST_KEY );
164 if (data.dsize % 8) {
165 DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
166 tdb_delete_bystring(tdb, NOTIFY_PID_LIST_KEY );
167 SAFE_FREE(data.dptr);
176 * Weed out all dead entries.
179 for( i = 0; i < data.dsize; i += 8) {
180 pid_t pid = (pid_t)IVAL(data.dptr, i);
182 if (pid == sys_getpid())
185 /* Entry is dead if process doesn't exist or refcount is zero. */
187 while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists(pid))) {
189 /* Refcount == zero is a logic error and should never happen. */
190 if (IVAL(data.dptr, i + 4) == 0) {
191 DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
192 (unsigned int)pid, printer_name ));
195 if (data.dsize - i > 8)
196 memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);