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-rw-r--r--src/util/doze.c71
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diff --git a/src/util/doze.c b/src/util/doze.c
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+/*++
+/* NAME
+/* doze 3
+/* SUMMARY
+/* take a nap
+/* SYNOPSIS
+/* #include <iostuff.h>
+/*
+/* void doze(microseconds)
+/* unsigned microseconds;
+/* DESCRIPTION
+/* doze() sleeps for the specified number of microseconds. It is
+/* a simple alternative for systems that lack usleep().
+/* DIAGNOSTICS
+/* All errors are fatal.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <sys/time.h>
+#include <unistd.h>
+#include <errno.h>
+#ifdef USE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <iostuff.h>
+
+/* doze - sleep a while */
+
+void doze(unsigned delay)
+{
+ struct timeval tv;
+
+#define MILLION 1000000
+
+ tv.tv_sec = delay / MILLION;
+ tv.tv_usec = delay % MILLION;
+ while (select(0, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &tv) < 0)
+ if (errno != EINTR)
+ msg_fatal("doze: select: %m");
+}
+
+#ifdef TEST
+
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+ unsigned delay;
+
+ if (argc != 2 || (delay = atol(argv[1])) == 0)
+ msg_fatal("usage: %s microseconds", argv[0]);
+ doze(delay);
+ exit(0);
+}
+
+#endif