web/license.html: make it clear that paraslash is licensed under the GPL V2
[paraslash.git] / close_on_fork.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file close_on_fork.c manage a list of fds that should be closed on fork */
8 #include "para.h"
9 #include "list.h"
10 #include "string.h"
11
12 static struct list_head close_on_fork_list;
13 static int initialized;
14
15 /**
16 * describes an element of the close-on-fork list
17 *
18 * \sa list.h
19 */
20 struct close_on_fork {
21 /** the file descriptor which should be closed after fork() */
22 int fd;
23 /** the position in the close-on-fork list */
24 struct list_head node;
25 };
26
27 /**
28 * add one file descriptor to the close-on-fork list
29 *
30 * \param fd the file descriptor to add
31 */
32 void add_close_on_fork_list(int fd)
33 {
34 struct close_on_fork *cof = para_malloc(sizeof(struct close_on_fork));
35
36 if (!initialized) {
37 INIT_LIST_HEAD(&close_on_fork_list);
38 initialized = 1;
39 }
40 cof->fd = fd;
41 para_list_add(&cof->node, &close_on_fork_list);
42 }
43
44
45 /**
46 * delete one file descriptor from the close-on-fork list
47 *
48 * \param fd the file descriptor to delete
49 *
50 * Noop if \a fd does not belong to the close-on-fork list.
51 */
52 void del_close_on_fork_list(int fd)
53 {
54 struct close_on_fork *cof, *tmp;
55
56 if (!initialized)
57 return;
58 list_for_each_entry_safe(cof, tmp, &close_on_fork_list, node) {
59 if (fd != cof->fd)
60 continue;
61 list_del(&cof->node);
62 free(cof);
63 }
64 }
65
66 /**
67 * call close(3) for each fd in the close-on-fork list
68 */
69 void close_listed_fds(void)
70 {
71 struct close_on_fork *cof;
72
73 if (!initialized)
74 return;
75 list_for_each_entry(cof, &close_on_fork_list, node) {
76 PARA_DEBUG_LOG("closing fd %d\n", cof->fd);
77 close(cof->fd);
78 }
79 }