[src/trunk]: src/bin/sleep add SIGINFO support; from freebsd:

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3d1b3d9a4cda
branches:  trunk
changeset: 757972:3d1b3d9a4cda
user:      mrg <mrg%NetBSD.org@localhost>
date:      Sat Oct 09 04:57:30 2010 +0000

description:
add SIGINFO support; from freebsd:

when a SIGINFO is delivered, display the approximate remaining seconds.

diffstat:

 bin/sleep/sleep.1 |   7 ++++++-
 bin/sleep/sleep.c |  30 ++++++++++++++++++++++++++----
 2 files changed, 32 insertions(+), 5 deletions(-)

diffs (85 lines):

diff -r 661a4168139e -r 3d1b3d9a4cda bin/sleep/sleep.1
--- a/bin/sleep/sleep.1 Fri Oct 08 11:20:22 2010 +0000
+++ b/bin/sleep/sleep.1 Sat Oct 09 04:57:30 2010 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: sleep.1,v 1.19 2007/08/18 00:41:52 hubertf Exp $
+.\"    $NetBSD: sleep.1,v 1.20 2010/10/09 04:57:30 mrg Exp $
 .\"
 .\" Copyright (c) 1990, 1993, 1994
 .\"    The Regents of the University of California.  All rights reserved.
@@ -57,6 +57,11 @@
 command will accept and honor a non-integer number of specified seconds.
 This is a non-portable extension, and its use will nearly guarantee that
 a shell script will not execute properly on another system.
+.Pp
+When the
+.Dv SIGINFO
+signal is received, the estimate of the amount of seconds left to
+sleep is printed on the standard output.
 .Sh EXIT STATUS
 The
 .Nm
diff -r 661a4168139e -r 3d1b3d9a4cda bin/sleep/sleep.c
--- a/bin/sleep/sleep.c Fri Oct 08 11:20:22 2010 +0000
+++ b/bin/sleep/sleep.c Sat Oct 09 04:57:30 2010 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: sleep.c,v 1.22 2008/07/20 00:52:40 lukem Exp $ */
+/* $NetBSD: sleep.c,v 1.23 2010/10/09 04:57:30 mrg Exp $ */
 
 /*
  * Copyright (c) 1988, 1993, 1994
@@ -39,7 +39,7 @@
 #if 0
 static char sccsid[] = "@(#)sleep.c    8.3 (Berkeley) 4/2/94";
 #else
-__RCSID("$NetBSD: sleep.c,v 1.22 2008/07/20 00:52:40 lukem Exp $");
+__RCSID("$NetBSD: sleep.c,v 1.23 2010/10/09 04:57:30 mrg Exp $");
 #endif
 #endif /* not lint */
 
@@ -57,13 +57,23 @@
 static void usage(void);
 int main(int, char *[]);
 
+static volatile sig_atomic_t report_requested;
+static void
+report_request(int signo __unused)
+{
+
+       report_requested = 1;
+}
+
+
 int
 main(int argc, char *argv[])
 {
        char *arg, *temp;
        double fval, ival, val;
        struct timespec ntime;
-       int ch, fracflag;
+       time_t original;
+       int ch, fracflag, rv;
 
        setprogname(argv[0]);
        (void)setlocale(LC_ALL, "");
@@ -115,7 +125,19 @@
                ntime.tv_nsec = 0;
        }
 
-       if (nanosleep(&ntime, NULL) == -1)
+       original = ntime.tv_sec;
+       signal(SIGINFO, report_request);
+       while ((rv = nanosleep(&ntime, &ntime)) != 0) {
+               if (report_requested) {
+               /* Reporting does not bother with nanoseconds. */
+                       warnx("about %d second(s) left out of the original %d",
+                       (int)ntime.tv_sec, (int)original);
+                       report_requested = 0;
+               } else
+                       break;
+       }
+
+       if (rv == -1)
                err(EXIT_FAILURE, "nanosleep failed");
 
        return EXIT_SUCCESS;