Merge commit 'remotes/fml/master'
[paraslash.git] / close_on_fork.c
1 /*
2 * Copyright (C) 2005-2008 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 * Delete one file descriptor from the close-on-fork list.
46 *
47 * \param fd The file descriptor to delete.
48 *
49 * Noop if \a fd does not belong to the close-on-fork list.
50 */
51 void del_close_on_fork_list(int fd)
52 {
53 struct close_on_fork *cof, *tmp;
54
55 if (!initialized)
56 return;
57 list_for_each_entry_safe(cof, tmp, &close_on_fork_list, node) {
58 if (fd != cof->fd)
59 continue;
60 list_del(&cof->node);
61 free(cof);
62 }
63 }
64
65 /**
66 * Call close(3) for each fd in the close-on-fork list.
67 */
68 void close_listed_fds(void)
69 {
70 struct close_on_fork *cof;
71
72 if (!initialized)
73 return;
74 list_for_each_entry(cof, &close_on_fork_list, node) {
75 PARA_DEBUG_LOG("closing fd %d\n", cof->fd);
76 close(cof->fd);
77 }
78 }