1 files changed, 74 insertions, 0 deletions
diff --git a/lib/util/nanosleep.c b/lib/util/nanosleep.c
new file mode 100644
index 0000000..84c41b8
--- /dev/null
+++ b/lib/util/nanosleep.c
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2011, 2013, 2017-2018, 2023
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#ifndef HAVE_NANOSLEEP
+
+#include <sys/types.h>
+#include <sys/time.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif /* HAVE_SYS_SELECT_H */
+#include <time.h>
+#include <errno.h>
+
+#include <sudo_compat.h>
+#include <sudo_util.h>
+
+int
+sudo_nanosleep(const struct timespec *timeout, struct timespec *remainder)
+{
+    struct timespec endtime, now;
+    struct timeval tv;
+    int rval;
+
+    if (timeout->tv_sec == 0 && timeout->tv_nsec < 1000) {
+	tv.tv_sec = 0;
+	tv.tv_usec = 1;
+    } else {
+	TIMESPEC_TO_TIMEVAL(&tv, timeout);
+    }
+    if (remainder != NULL) {
+	if (sudo_gettime_real(&endtime) == -1)
+	    return -1;
+	sudo_timespecadd(&endtime, timeout, &endtime);
+    }
+    rval = select(0, NULL, NULL, NULL, &tv);
+    if (remainder != NULL) {
+	if (rval == 0) {
+	    /* Timeout expired, no remaining time. */
+	    sudo_timespecclear(remainder);
+	} else if (errno == EINTR) {
+	    /* Interrupted, compute remaining time. */
+	    if (sudo_gettime_real(&now) == -1)
+		return -1;
+	    sudo_timespecsub(&endtime, &now, remainder);
+	    if (remainder->tv_sec < 0 || remainder->tv_nsec < 0)
+		sudo_timespecclear(remainder);
+	}
+    }
+    return rval;
+}
+#endif /* HAVE_NANOSLEEP */