2 May
2020
2 May
'20
2:52 a.m.
Does anyone know if dbx ended up 8 or 9th
I believe the only debuggers on research machines were
db v1-v6
adb v7,v9,v10
cdb v3-v6
sdb v8-v9
pi v8-v10
Doug
2 May
2 May
5:45 p.m.
New subject: SDB debugger
So I definitely remember adb, I liked it for the same reasons that Rob
did, it told you the truth.
I also remember using a sdb debugger, not sure if it was at Sun or
when I was doing a Sys V port. I liked it, it was reasonable.
I think dbx ended up becoming the one I used on BSD. Gdb eventually
got good enough but I'm with Rob, it was a mess early on.
But truth be known, I'm sort of a printf() debugger. The main thing
I use gdb for is a stack trace, that's usually enough. The BitKeeper
source has this "gem":
void
gdb_backtrace(void)
{
FILE *f;
char *cmd;
unless (getenv("_BK_BACKTRACE")) return;
unless ((f = efopen("BK_TTYPRINTF")) ||
(f = fopen(DEV_TTY, "w"))) {
f = stderr;
}
cmd = aprintf("gdb -batch -ex backtrace '%s/bk' %u 1>&%d
2>&%d",
bin, getpid(), fileno(f), fileno(f));
system(cmd);
free(cmd);
if (f != stderr) fclose(f);
}
On Fri, May 01, 2020 at 10:52:49PM -0400, Doug McIlroy wrote:
--
---
Larry McVoy lm at mcvoy.com http://www.mcvoy.com/lm
Does anyone
know if dbx ended up 8 or 9th
I believe the only debuggers on research machines were
db v1-v6
adb v7,v9,v10
cdb v3-v6
sdb v8-v9
pi v8-v10
Doug 
3 May
3 May
4:16 p.m.
New subject: SDB debugger
On May 2, 2020, at 10:45, Larry McVoy
<lm(a)mcvoy.com> wrote:
... But truth be known, I'm sort of a printf() debugger. ...
So am I, and ISTR Brian Kernighan and Larry Wall saying that they are, as well. Over the
years, I've written some scripts to make this less painful. For example, in Ruby, I
use the et() script, as written up in http://wiki.cfcl.com/Projects/Ruby/Phone_Home:
l = %w[ context~ dir_path# file_path foo.bar bar[:baz] ]
et(l)
This produces the following output:
some_script:72:in `main'
context { :foo => "yada yada yada", ... }
file_path "a/b/c"
foo.bar :warn
bar[:baz] 42
I also have a tiny Elixir script, ii/2, which works nicely in pipelines:
...
|> ii(:foo)
...
-r
12 May
12 May
4:36 a.m.
New subject: SDB debugger
On Sun, 3 May 2020, Rich Morin wrote:
> On May 2, 2020, at 10:45, Larry McVoy
<lm(a)mcvoy.com> wrote:
>
> ... But truth be known, I'm sort of a printf() debugger. ...
[...]
As am I, but the bug sometimes disappears :-( Code offsets, or something?
-- Dave
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days inactive
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3 comments
4 participants
participants (4)
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Dave Horsfall -
Doug McIlroy -
Larry McVoy -
Rich Morin