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List:       busybox-cvs
Subject:    [Bug 15386] New: ping -w doesn't respect timeout if -c is specified
From:       bugzilla () busybox ! net
Date:       2023-03-12 12:58:08
Message-ID: bug-15386-161 () https ! bugs ! busybox ! net/
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https://bugs.busybox.net/show_bug.cgi?id=15386

            Bug ID: 15386
           Summary: ping -w doesn't respect timeout if -c is specified
           Product: Busybox
           Version: 1.35.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Networking
          Assignee: unassigned@busybox.net
          Reporter: gschintgen@hambier.lu
                CC: busybox-cvs@busybox.net
  Target Milestone: ---

On Alpine 3.17 with busybox 1.35 I noticed the following:

nodered:~# time ping -w 1 192.168.12.34
PING 192.168.12.34 (192.168.12.34): 56 data bytes

--- 192.168.12.34 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
Command exited with non-zero status 1
real    0m 1.00s
user    0m 0.00s
sys     0m 0.00s
nodered:~# time ping -w 1 -c 1 192.168.12.34
PING 192.168.12.34 (192.168.12.34): 56 data bytes

--- 192.168.12.34 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
Command exited with non-zero status 1
real    0m 10.00s
user    0m 0.00s
sys     0m 0.00s


In other words, if a count is specified, ping no longer follows its documented
behaviour which only mentions *earlier* exiting.

        -w SEC          Seconds until ping exits (default:infinite)
                        (can exit earlier with -c CNT)

For comparison, here is the output for ping from iputils 20211215 (Ubuntu
22.04):

$ time ping -w 1 192.168.12.34
PING 192.168.12.34 (192.168.12.34) 56(84) bytes of data.

--- 192.168.12.34 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms


real    0m1.007s
user    0m0.006s
sys     0m0.001s
$ time ping -w 1 -c 1 192.168.12.34
PING 192.168.12.34 (192.168.12.34) 56(84) bytes of data.

--- 192.168.12.34 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms


real    0m1.006s
user    0m0.001s
sys     0m0.006s


I can't say with certainty which behaviour is correct or incorrect (e.g. when
compared to POSIX or some other reference Unix specification), so please
indulge me if this is not an actual bug on busybox's side.

(My use case is using a nodered ping node with configurable timeout. It didn't
work quite right on my nodered instance and I tracked it down to this
difference.)

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