[uClibc]strace of uClibc/busybox ctrl+c problem

[Giulio Orsero]

On Wed, 9 Jan 2002 05:19:24 -0700, you wrote:

>Odd.  ash never calls setpgid()...  Wierd.
><reads ash source>
>Oh.  It looks like in both busybox and busybox.stable
>trees, job control is disabled by default.
>
>Could you try one more test?  Edit busybox/shells/ash.c
>or busybox.stable/ash.c (depending on which tree you
>are working from) and change
>    -    #undef JOBS
>    +    #define JOBS
>and let me know if that fixes it?  If so, I think I'll move

Yes, this helps in some cases: now I can do "more ..." and ctrl+c correctly
returns to prompt.
===
read(0, "\4", 1)                        = 1
ioctl(0, SNDCTL_TMR_START, {B9600 opost isig icanon echo ...}) = 0
ioctl(0, TCGETS, {B9600 opost isig icanon echo ...}) = 0
rt_sigaction(SIGWINCH, {SIG_DFL}, {0x8064500, [], SA_RESTART}, 8) = 0
setpgid(0, 3073)                        = 0
ioctl(2, TIOCSPGRP, [3073])             = 0
_exit(1)
===


However, given the following script

===
#!./busybox ash
read key
echo $key
===

if you ctrl+c when it's prompting you get sigsev:


==== trace of script
getdents(4, /* 0 entries */, 4096)      = 0
close(4)                                = 0
read(0, 0xbffff383, 1)                  = ? ERESTARTSYS (To be restarted)
--- SIGINT (Interrupt) ---
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigaction(SIGINT, {SIG_DFL}, {0x80635d8, [], 0}, 8) = 0
getpid()                                = 3081
kill(3081, SIGINT)                      = 0
--- SIGINT (Interrupt) ---

==== trace of busybox ash
close(4)                                = 0
fork()                                  = 3081
setpgid(3081, 3081)                     = 0
getpgrp()                               = 3080
wait4(-1, [WIFSIGNALED(s) && WTERMSIG(s) == SIGINT], WUNTRACED, NULL) = 3081
--- SIGCHLD (Child exited) ---
ioctl(2, TIOCSPGRP, [3080])             = 0
getpid()                                = 3080
kill(3080, SIGINT)                      = 0
--- SIGINT (Interrupt) ---
sigreturn()                             = ? (mask now [])
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

So is this just an ash problem?


-- 
giulioo at pobox.com