the attached text is how it looks like since newly
On Wed, Feb 2, 2022 at 3:35 PM L A Walsh <b...@tlinx.org> wrote:
>
> I was trying to find parameters to a function that gave an error, so
> I 'turned on' (included my backtracing routine), which showed:
>
> ./24bc: line 46: printf: `txt=\nRed,': not a valid identifier
> STOPPING execution @ "printf ${_:+-v $_} '\x1b[48;2;%s;%s;%sm' $1 $2 $3"
> in "setBgColor()" at ./24bc #46
> called in setBackBlack() at ./24bc #56
> called in title() at ./24bc #74
> called in main() at ./24bc #81
>
> ----
> I was all, 'rats, its not showing the params', I wondered why and looked
> at the code,
> and realized that while I can backtrace function, source line+file, I didn't
> know how to display the params that were used when the function was called.
>
> Is there, or maybe 'can there', be a BASH var like
> FUNCPARMS[1]="(P1 P2 P3)"
>
> Of course it would be handy if bash could parse this w/o using an
> intermediate var:
>
> echo "${${FUNCPARMS[@]}[1]}" =>
> # (tmp=${FUNCPARMS[@]} tmp=(P1 P2 P3) )
> # echo "${tmp[1]}"
> P1
>
> ---
> But even without the enhanced parsing output, it would still
> be useful if bash had & filled in the param vars.
>
> FUNCPARMS would parallel 'FUNCNAME', i.e.
> FUNCPARMS[1] would hold the quoted array "()" PARMS for FUNCNAME[1].
>
> FWIW, my primitive backtrace function (source or "include") follows:
>
> ----
> #!/bin/bash -u
>
> shopt -s expand_aliases
> alias my='declare ' int='my -i '
>
> backtrace () {
> trap ERR
> int level=0
> my cmd fn src ln
> int iter=0
> while {
> cmd=$BASH_COMMAND; fn=${FUNCNAME[level+1]:-}
> src=${BASH_SOURCE[level+1]:-} ln=${BASH_LINENO[level]:-}
> }; do
> [[ $fn && $src && $ln ]] && {
> if ((iter++==0)); then
> printf 'STOPPING execution @ "%s" in "%s()" at %s #%s\n' "$cmd"
> "$fn" "$src" "$ln"
> else
> printf ' called in %s() at %s #%s\n' "$fn" "$src" "$ln"
> fi
> level+=1
> continue;
> }
> exit 1
> done
> }
> set -o errtrace
> trap backtrace ERR
> trap backtrace QUIT
> set -E
>
>
>
gdb /bin/bash
GNU gdb (Debian 10.1-2) 10.1.90.20210103-git
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Reading symbols from /bin/bash...
(gdb) r
Starting program: /bin/bash
[Detaching after fork from child process 19238]
[Detaching after fork from child process 19239]
[Detaching after fork from child process 19241]
[Detaching after fork from child process 19247]
[Detaching after fork from child process 19248]
[Detaching after fork from child process 19250]
[Detaching after fork from child process 19252]
[Detaching after fork from child process 19258]
[Detaching after fork from child process 19259]
[Detaching after fork from child process 19261]
[Detaching after fork from child process 19263]
[Detaching after fork from child process 19269]
[Detaching after fork from child process 19270]
[Detaching after fork from child process 19272]
[Detaching after fork from child process 19273]
[Detaching after fork from child process 19274]
[Detaching after fork from child process 19275]
0 exit 0s old @1643813132.626878 == Wed Feb 2022-02-02 15:45:32.626878 +0100
# root:0:0 # @ /dev/pts/4 ( 0 ) boost -> /root
apt_update.log neovide/ .bash .viminfo .profile .bashrc .lesshst apt_update*
maint/ CandyCrush.app/ .wget-hsts .ssh/ xbl.tgz .bash_history code/ work/ a
.bumblebee/ bash/ bash../ 7/ .xbl/ 7e/ .vim/ bashgawkdebiandocs/ 7e./ 7./
.xmbash2 .xmbash xbl5e/ xbl5/ xbl5e.293370402/ xbl5.3623237236/ xmbdocs/
xmbdocs.tgz ikhxc@ xbl5.tgz bl5/ bl5e/ bl5.tgz bash2/ .vimrc desk@
Program received signal SIGTERM, Terminated.
pselect64_syscall (sigmask=0x555555690000 <_rl_orig_sigset>, timeout=<optimized
out>,
exceptfds=0x0, writefds=0x0, readfds=0x7fffffffd8d0, nfds=1)
at ../sysdeps/unix/sysv/linux/pselect.c:35
35 ../sysdeps/unix/sysv/linux/pselect.c: No such file or directory.
(gdb) bt
#0 pselect64_syscall (sigmask=0x555555690000 <_rl_orig_sigset>,
timeout=<optimized out>,
exceptfds=0x0, writefds=0x0, readfds=0x7fffffffd8d0, nfds=1)
at ../sysdeps/unix/sysv/linux/pselect.c:35
#1 __pselect (nfds=1, readfds=readfds@entry=0x7fffffffd8d0,
writefds=writefds@entry=0x0,
exceptfds=exceptfds@entry=0x0, timeout=<optimized out>, timeout@entry=0x0,
sigmask=0x555555690000 <_rl_orig_sigset>) at
../sysdeps/unix/sysv/linux/pselect.c:57
#2 0x00005555556333ef in rl_getc (stream=0x7ffff7f7ea80 <_IO_2_1_stdin_>) at
input.c:548
#3 0x0000555555633d05 in rl_read_key () at input.c:514
#4 0x0000555555617962 in readline_internal_char () at readline.c:586
#5 0x00005555556182c5 in readline_internal_charloop () at readline.c:694
#6 readline_internal () at readline.c:706
#7 readline (prompt=<optimized out>) at readline.c:385
#8 0x00005555555873fe in yy_readline_get () at
/Users/chet/src/bash/src/parse.y:1488
#9 0x0000555555589950 in yy_getc () at /Users/chet/src/bash/src/parse.y:1422
#10 shell_getc (remove_quoted_newline=remove_quoted_newline@entry=1)
at /Users/chet/src/bash/src/parse.y:2358
#11 0x000055555558ce6c in read_token (command=0) at
/Users/chet/src/bash/src/parse.y:3290
#12 0x0000555555590d71 in yylex () at /Users/chet/src/bash/src/parse.y:2797
#13 yyparse () at y.tab.c:1835
#14 0x0000555555586516 in parse_command () at eval.c:347
#15 0x00005555555866b4 in read_command () at eval.c:391
#16 0x00005555555868c8 in reader_loop () at eval.c:138
#17 0x0000555555585450 in main (argc=1, argv=0x7fffffffec68, env=0x7fffffffec78)
at shell.c:811
(gdb)
