1 files changed, 80 insertions, 0 deletions
diff --git a/common/inotify_helpers.h b/common/inotify_helpers.h
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+/* inotify_helper.h - Simple iteration for inotify events
+ *
+ * Copyright (C) 2014 Luke Shumaker
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* The usage is pretty simple:
+ *
+ *     int my_filedesc = inotify_init();
+ *     ...
+ *     struct inotify_event *my_event;
+ *     for (INOTIFY_ITR(my_filedesc, my_event)) {
+ *         ...
+ *     }
+ *
+ * Easy, right?
+ */
+
+#ifndef _INOTIFY_HELPER_H
+#define _INOTIFY_HELPER_H
+
+#include <sys/inotify.h>
+#include <limits.h> /* for NAME_MAX */
+#include <string.h> /* for memset(3) */
+#include <unistd.h> /* for read(3) */
+
+struct _inotify_buffer {
+	ssize_t len;
+	ssize_t pos;
+	char dat[sizeof(struct inotify_event)+NAME_MAX+1];
+};
+
+#define	_INOTIFY_ITR_EVENT(BUF) \
+	((struct inotify_event *)&((BUF).dat[(BUF).pos]))
+#define	_INOTIFY_ITR_EVENT_SIZE(BUF) \
+	(sizeof(struct inotify_event) + _INOTIFY_ITR_EVENT(BUF)->len)
+
+#define _INOTIFY_ITR_INIT(FD, BUF, EVENT)                                      \
+	struct _inotify_buffer BUF = ({                                        \
+		struct _inotify_buffer tmp;                                    \
+		memset(&tmp, 0, sizeof(tmp));                                  \
+		do {                                                           \
+			tmp.len = read(FD, tmp.dat, sizeof(tmp.dat));          \
+		} while (tmp.len == 0);                                        \
+		EVENT = (struct inotify_event *)&BUF;                          \
+		tmp;                                                           \
+	})
+#define	_INOTIFY_ITR_CHECK(FD, BUF, EVENT) \
+	BUF.len > -1
+#define	_INOTIFY_ITR_UPDATE(FD, BUF, EVENT)                                    \
+	EVENT = ({                                                             \
+		if (BUF.len-(BUF.pos+_INOTIFY_ITR_EVENT_SIZE(BUF)) < 1) {      \
+			do {                                                   \
+				BUF.len = read(FD, BUF.dat, sizeof(BUF.dat));  \
+			} while (BUF.len == 0);                                \
+			BUF.pos = 0;                                           \
+		} else {                                                       \
+			BUF.pos += _INOTIFY_ITR_EVENT_SIZE(BUF);               \
+		}                                                              \
+		_INOTIFY_ITR_EVENT(BUF);                                       \
+	})
+
+#define INOTIFY_ITR(FD, EVENT) \
+	_INOTIFY_ITR_INIT(FD, _buf, EVENT); \
+	_INOTIFY_ITR_CHECK(FD, _buf, EVENT); \
+	_INOTIFY_ITR_UPDATE(FD, _buf, EVENT)
+
+#endif