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List:       busybox
Subject:    Re: Runit Fatal Error: Function Not Implemented
From:       Denys Vlasenko <vda.linux () googlemail ! com>
Date:       2019-02-19 14:28:55
Message-ID: CAK1hOcNoeTac_OVe+ofS67xTm9t=t=cTRWei7RS1p2qo3DjYkw () mail ! gmail ! com
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On Sat, Feb 16, 2019 at 7:29 AM Richardyusen <richardyusen@126.com> wrote:
> Hello,
> Sorry, I typed the error message from my memory. I ran it again and the exact
> message did use the word "can't" instead of "unable to". I lost my previous
> busybox build config, so I rebuilt a new one following the same procedure I
> used last time. I checked that "CONFIG_FLOCK" is set to "y" in the busybox
> .config file

This enables flock *applet*. This has nothing to do with the problem.

, however I didn't manage to find any "flock" related fields in the
> kernel config file. I put this newly compiled busybox into the system, and
> it gave me the exact same error!

Since now you have flock applet, let's see what happens when flock()
is called. Try this:

$ strace busybox flock README busybox true
ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
prctl(PR_SET_NAME, "busybox")           = 0
getuid32()                              = 0
open("README", O_RDONLY|O_CREAT|O_NOCTTY|O_LARGEFILE, 0666) = 3
flock(3, LOCK_EX)                       = 0
vfork()                                 = 6787
wait4(6787, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 6787
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=6787,
si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
exit(0)                                 = ?
+++ exited with 0 +++

What do you see?
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