am7xxx: add a msleep() implementation in tools.[ch]

[libam7xxx.git] / src / tools.c

diff --git a/src/tools.c b/src/tools.c
new file mode 100644 (file)
index 0000000..be63ac6
--- /dev/null
+++ b/src/tools.c
@@ -0,0 +1,48 @@
+/* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
+ *
+ * Copyright (C) 2014  Antonio Ospite <ao2@ao2.it>
+ *
+ * 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 2 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/>.
+ */
+
+#include <errno.h>
+#include <time.h>
+
+#include "tools.h"
+
+/**
+ * Sleep for a period expressed in milliseconds
+ *
+ * @param[in] msecs Time to sleep in milliseconds
+ *
+ * @return 0 on success, -1 on error
+ */
+int msleep(unsigned long msecs)
+{
+       struct timespec delay;
+       int ret;
+
+       delay.tv_sec = msecs / 1000;
+       delay.tv_nsec = (msecs % 1000) * 1000000;
+       while (1) {
+               ret = nanosleep(&delay, &delay);
+               if (ret == -1 && errno == EINTR)
+                       continue;
+               break;
+       }
+       if (ret == -1)
+               return ret;
+
+       return 0;
+}