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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
commit464df1d5e5ab1322e2dd0a7796939fff1aeefa9a (patch)
tree6a403684e0978f0287d7f0ec0e5aab1fd31a59e1 /lib/ext2fs/atexit.c
parentInitial commit. (diff)
downloade2fsprogs-464df1d5e5ab1322e2dd0a7796939fff1aeefa9a.tar.xz
e2fsprogs-464df1d5e5ab1322e2dd0a7796939fff1aeefa9a.zip
Adding upstream version 1.47.0.upstream/1.47.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/ext2fs/atexit.c')
-rw-r--r--lib/ext2fs/atexit.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/lib/ext2fs/atexit.c b/lib/ext2fs/atexit.c
new file mode 100644
index 0000000..b3be1d5
--- /dev/null
+++ b/lib/ext2fs/atexit.c
@@ -0,0 +1,116 @@
+/*
+ * atexit.c --- Clean things up when we exit normally.
+ *
+ * Copyright Oracle, 2014
+ * Author Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#ifndef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE
+#endif
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+#include "config.h"
+#include <stdlib.h>
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+#include "ext2fsP.h"
+
+struct exit_data {
+ ext2_exit_fn func;
+ void *data;
+};
+
+static struct exit_data *items;
+static size_t nr_items;
+
+static void handle_exit(void)
+{
+ struct exit_data *ed;
+
+ for (ed = items + nr_items - 1; ed >= items; ed--) {
+ if (ed->func == NULL)
+ continue;
+ ed->func(ed->data);
+ }
+
+ ext2fs_free_mem(&items);
+ nr_items = 0;
+}
+
+/*
+ * Schedule a function to be called at (normal) program termination.
+ * If you want this to be called during a signal exit, you must capture
+ * the signal and call exit() yourself!
+ */
+errcode_t ext2fs_add_exit_fn(ext2_exit_fn func, void *data)
+{
+ struct exit_data *ed, *free_ed = NULL;
+ size_t x;
+ errcode_t ret;
+
+ if (func == NULL)
+ return EXT2_ET_INVALID_ARGUMENT;
+
+ for (x = 0, ed = items; x < nr_items; x++, ed++) {
+ if (ed->func == func && ed->data == data)
+ return EXT2_ET_FILE_EXISTS;
+ if (ed->func == NULL)
+ free_ed = ed;
+ }
+
+ if (free_ed) {
+ free_ed->func = func;
+ free_ed->data = data;
+ return 0;
+ }
+
+ if (nr_items == 0) {
+ ret = atexit(handle_exit);
+ if (ret)
+ return ret;
+ }
+
+ ret = ext2fs_resize_mem(0, (nr_items + 1) * sizeof(struct exit_data),
+ &items);
+ if (ret)
+ return ret;
+
+ items[nr_items].func = func;
+ items[nr_items].data = data;
+ nr_items++;
+
+ return 0;
+}
+
+/* Remove a function from the exit cleanup list. */
+errcode_t ext2fs_remove_exit_fn(ext2_exit_fn func, void *data)
+{
+ struct exit_data *ed;
+ size_t x;
+
+ if (func == NULL)
+ return EXT2_ET_INVALID_ARGUMENT;
+
+ for (x = 0, ed = items; x < nr_items; x++, ed++) {
+ if (ed->func == NULL)
+ return 0;
+ if (ed->func == func && ed->data == data) {
+ size_t sz = (nr_items - (x + 1)) *
+ sizeof(struct exit_data);
+ memmove(ed, ed + 1, sz);
+ memset(items + nr_items - 1, 0,
+ sizeof(struct exit_data));
+ }
+ }
+
+ return 0;
+}