ok

come out of that

debuginfo-install ncurses

might not work being statically built but worth a try

Are you still trying to make that mview shit work?

@MichaelHampton @ewwhite's masochism knows no bounds

@MichaelHampton Client says it's worth a certain amount of $ to them.

Polishing turds. Thats my forte.

(or he's progressing into sadism and enjoys abusing @MatthewIfe)

I'll need to give @MatthewIfe his share.

oh ugh... debug info repos...

one moment

Some serious sysadmin shit going on in here.

Well, its worth it if this MASSIVE HACK actually works.

@MatthewIfe It's pulling the glibc debug info... I'm wondering if I should move to the development server.

what are you guys doin

dont actually need any of the other debuinfos tbh

it might whine about missing symbols but we dont need all of them

@MatthewIfe I'm not sure there's an nurses debug info...

digging

Thats why you should use scientific linux ;)

Comes with all source packages and debuginfos

@ewwhite Have you been typing "nurses" into xvideos a lot lately? I think you mean ncurses ;)

for the record, this trick does work in iptraf. But not sure how itll behave with a statically built binary

@MatthewIfe I found the corresponding debug info from Oracle Enterprise Linux

hmm, may not work

builds a checksummed

also.. may not work anyway as it could depend on what static lib they built ncurses with

versions match... I'll check to see if I can find elsewhere.

ncurses-debuginfo-5.7-3.20090208.el6.x86_64.rpm

Thanks, CentOS - bugs.centos.org/view.php?id=5950

try for the scientific linux one

ftp1.scientificlinux.org/linux/scientific/6rolling/archive/…

got it

Do you guys ever leave this tab opens and it accumulates a half-day's worth of filth messages and almost crashes your browser

@MatthewIfe Trust me you're not the only gig in town.

@MatthewIfe Installed.

ok.. lets try this again :-\

run db

in another shell gdb --pid=<pid>

Guys is CentOS dead

call get_escdelay()

@JoelESalas no?

(gdb) call get_escdelay()
No symbol "get_escdelay" in current context.

@Jacob Is there a better distribution I should be using for new-ish applications and deployments

@JoelESalas no, it was dead a few years ago... but it's holding okay now

@JoelESalas not at the moment

@ewwhite Not even Ubuntu??

@JoelESalas On the stability front CentOS is still your best option. If you want to fly by the seat of your pants Go Ubuntu and never have a goodnight of sleep again!

can you pastebin the results of

@Jacob I was thinking Fedora for newer app servers..

might be big.. readelf -s /path/to/bin/of/dbc

@JoelESalas I have some thoughts on Fedora...

@MichaelHampton Go on :)

@MatthewIfe pretty verbose

I imagined as much :)

You have exceeded the maximum file size of 500 kilobytes per paste. PRO users don't have this limit!

:)

I downvoted and VTC'd this guy...if you disagree fine, but the guy is a maroon...

heh

@RobM For a test environment, with up to 5 users, there's no way it's going to need (let alone, use) the 12 vCPUs and 48 GB RAM they're asking for. And if it does, then I don't want it on my freaking ESXi host cluster. They can quarantine it on its own servers, preferably not even connected to the same network as the rest of our servers.

@MatthewIfe looking for something specific?

Want to see what symbols it exports

regarding curses

@JoelESalas TL;DR: In the case where you absolutely need more current versions of software not available in a more "enterprisey" distribution, and you can accept the tradeoffs, then there is nothing wrong with using Fedora.

which doesnt seem to have any useful prefix on its functions

which is irritating

@MatthewIfe not easily searchable

well you can grep fo escdelay

@MichaelHampton That's my philosophy in general, only problem being that it also holds for Ubuntu Server which I fucking hate

see if anything comes up

@TheCleaner Well, I agree with the downvote.

@JoelESalas @MichaelHampton Sums it pretty well. Getting any down time is damn near impossible for me, so CentOS really shines there. I would use it if I really needed bleeding edge, but get ready to upgrade a lot. fedoraproject.org/wiki/Server

@MatthewIfe Only halfdelay, delay_output and nodelay

@Jacob Yeah, but the thing about that is, a Fedora upgrade can be less downtime than a CentOS reboot.

we're only just turning off the last of our 10.04 vms

I thought they were all dead, but there were a couple hiding out

@ewwhite it may be worth just checking at this point we will actually find our issue doing this.

k

@MichaelHampton Besides, cPanel isn't supported on Fedora.

@JoelESalas That's the general reason people switch to Ubuntu when RHEL gets to be two or three years old. But Ubuntu is hardly comparable to Fedora in any other way.

@MichaelHampton I'm just over here rolling CentOS packages, lusting after docker, and seriously wondering why Fedora wouldn't work in our fast paced, scrap-and-rebuild environment

Try stracing the db program again, this time using strace -p<pid> -e read,write,select

@Jacob Seems like someone would care enough about Linux not being a steaming pile of suck to make sure cPanel isn't supported on any distro...

@MatthewIfe with mview?

@JoelESalas It probably would. Hell, Docker is available in Fedora already.

Try without for now

@MatthewIfe k. It's moving quickly

yeah

does it pause if you produce no input

@HopelessN00b it continues to go downhill with his comments

yes, it waits

ok

bring up a window you can press escape on

this is a a bit diryt.. but press enter a few times to leave a noticable gap in the shell

then press escape

scroll back up to your gap to see what happened

@JoelESalas yum install docker-io and have a ball.

@TheCleaner Yeah, I could have told you that without even reading the comments, though. Probably most of us could have too.

@MatthewIfe just menu data...

no select inbetween?

@MatthewIfe pastebin.com/JcBJPBtk

assume you did -e read,write,select ?

my traces show select

no selects at all

in iptraf anyhows

=D

@HopelessN00b :) scary enough, I think he might be asking if x.x.x.x is the right format for the IP address. I'm not going to keep feeding him though...

if you launch it via mview does that produce selects?

let's try

that 1 sec delay thing is very much a select system call

@HopelessN00b all things considered...it's better than the guy with the bounty arguing with me that Exchange should work like Google Apps does.

@TheCleaner Yeah, user is hopelessly clueless. No point in even trying to help at this point.

@TheCleaner Missed that one... sounds like a good example of why I don't bother with bounty questions, though.

@MatthewIfe I'm filtering on -e select now...

Process 56620 attached - interrupt to quit
--- SIGALRM (Alarm clock) @ 0 (0) ---
--- SIGALRM (Alarm clock) @ 0 (0) ---

that the dbc process or mview?

@TheCleaner Oh, I was wrong, I saw that one. Just before the arguing, I guess.

that's the result of hitting escape twice under mview

and tracing dbc?

i.e tracing dbc that was spawned in mview, not trying dbc as a fresh instance.

@MatthewIfe doing DBC alone produces no select output....

and yes, tracing the DBC spawned from mview.

@JoelESalas If you're seriously interested, there's a newly formed Fedora Server SIG as well as the more established Cloud SIG the latter of which is of interest if you are using docker.

Well -- thats pretty weird.

Ncurses over here uses select quite a lot.

Thats how escdelay is done in fact using select as a timeout.

Maybe really really old versions of ncurses dont use it?

here, the delays are all --- SIGALRM (Alarm clock) @ 0 (0) ---

hmm.

can you try tracing dbc again

but this time, do strace -fp

without mview?

strace -fp <pid> -e select. with mview

It may be spawning children that have the terminal window foreground.

[root@Procacci ~]# strace -fp 4738 -e select
Process 4738 attached - interrupt to quit
--- SIGALRM (Alarm clock) @ 0 (0) ---
--- SIGALRM (Alarm clock) @ 0 (0) ---
--- SIGALRM (Alarm clock) @ 0 (0) ---
--- SIGALRM (Alarm clock) @ 0 (0) ---

single-threaded processes...

ok back up a step. Tracing mview with read/write

do strace -tt -e read,write path/to/mview

do the escape thing

I did a full trace and am searching around the alarms...

see if the timestamps display the 1 second delay.

4738  stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=3519, ...}) = 0
4738  stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=3519, ...}) = 0
4738  rt_sigprocmask(SIG_BLOCK, [INT QUIT USR1 USR2 ALRM TSTP IO], [], 8) = 0
4738  setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={60, 0}}, {it_interval={0, 0}, it_value={0, 0}}) = 0
4738  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
4738  poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
4738  read(0, "\33", 1)                 = 1

oh, one moment

@MatthewIfe I see the delays

Give me a sample trace.

17:49:26.674908 read(0, "\33", 2048)    = 1
17:49:26.675013 write(6, "\33", 1)      = 1
17:49:27.678120 read(3, "\33[1;1H\33[22;37m \33[1;1H \33[1;1H    "..., 2048) = 2048
17:49:27.678185 write(1, "\33[1;1H\33[22;37m \33[1;1H \33[1;1H    "..., 2048) = 2048
17:49:27.678257 read(3, "                                "..., 2048) = 2048
17:49:27.678286 write(1, "                                "..., 2048) = 2048
17:49:27.678330 read(3, "                                "..., 2048) = 2048
17:49:27.678354 write(1, "                                "..., 2048) = 2048

between 17:49:26.675013 and 17:49:27.678120

So, you can see this isnt being cause by mview

line 1 shows you get from stdin an esc (\33)

this is only watching the mview binary... not dbc spawned by mview.

Ugh. Even good enterprise software sucks. I can think of no other explanation for why it's an ordeal to copy VM templates between vCenter servers.

line 2 shows almost immediately it sends it to fd 6, this is the output pipe to dbc

it then receives a read a second later from the input pipe of dbc

the delay must be being caused by dbc

phew :) least thats a definite!

what you could do

@MatthewIfe if I do the same on the dbc program spawned by mview, I get...

17:52:02.797958 read(0, "\33", 1)       = 1
17:52:02.798363 read(0, 0x8483c1, 255)  = ? ERESTARTSYS (To be restarted)
17:52:03.798424 --- SIGALRM (Alarm clock) @ 0 (0) ---
17:52:03.799004 read(22, "\20\357\1\0002013122811341382\0\0\0006\v\0Q\n\0\367\v9"..., 16384) = 4477
17:52:03.799570 read(22, "", 4477)      = 0
17:52:03.799808 read(3, "I\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0@\0\0\0\0\0@\0       "..., 16384) = 16384

ooh interesting

try tracing it with -e read,write,alarm

17:53:47.621718 read(0, "\33", 1)       = 1
17:53:47.621768 alarm(0)                = 49
17:53:47.621812 alarm(1)                = 0
17:53:47.621834 read(0, 0x8483c1, 255)  = ? ERESTARTSYS (To be restarted)
17:53:48.621873 --- SIGALRM (Alarm clock) @ 0 (0) ---
17:53:48.621951 alarm(0)                = 0
17:53:48.621993 alarm(48)               = 0

heh

theres your delay

lol theres a way to hack this to work faster

but its not workable.

hmm in fact

it probably might be if i kludge mview

this is really dirty though.

so, the trick here

is that in mview you check if the character you just send is esc.

What exactly is the alarm(0) = 49?

IF it is, you usleep(10000) (10 milisecond delay) then send sigalrm from mview to dbc, which wakes it up early.

its the number of seconds remaining on a previously set alarm

alarm(0) disables the alarm set previously.

so it's definitely the mview program.. or an interaction between the two?

its definitely dbc

i think dbc is compiled using an ancient ncurses

that doesn't even use select, uses alarm

on esc is sets an alarm for 1 second to wait.

why does it only surface when mview is in the mix?

you see the delay in mview because you do <esc> --> read into mview --> write to dbc --> DELAY WHILE DBC ALARMS --> write back to mview

ah...

Would screen do the same?

Yeah, probably.

Well, you can try in fact

to run dbc natively

and strace again using the alarm strace

see what it reckons it does then.

same happens in a screen session

ncurses may possibly be detecting that stdin is a pipe and not a tty

which is why it behaves differently.

whats the strace show with dbc ran natively

one sec

@MatthewIfe native...

18:08:55.881718 read(0, "\33", 256)     = 1
18:08:55.881820 read(0, "", 255)        = 0
18:08:55.982031 read(35, "\20\357\1\0002013122811341382\0\0\0006\v\0Q\n\0\367\v9"..., 16384) = 4477
18:08:55.982486 read(35, "", 4477)      = 0
18:08:55.982570 write(1, "\33[5;1H\33[22;37m                  "..., 1024) = 1024
18:08:55.982762 read(3, "I\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0@\0\0\0\0\0@\0       "..., 16384) = 16384
18:08:55.982816 read(3, "VADRIANA \0\0\0\0\5\20\0DUMMY   \0\0\0\0\n \0J"..., 16384) = 16384

no alarm

i guess it figures its a pipe or something

whats the name of that environment program agian

crtenv or something

gonna send you a new mview

cvtenv

pastebin.com/QavQVyJY

@MDMoore313 Personally I think the only time for editing a question is when there's gramattical errors or typos

try that

be very aware this breaks mview from working with anything but this program

@MDMoore313 Oh god, you waded into mSO. That pool is full of sharks...

also it ASSUMES that every escape MUST follow an alarm. That might also break dbc

we'll just have a to see.

@MatthewIfe pulling headers so I can compile

I put it back the way i got it. But remove stropts.h

wouldnt compile on my box with that there

@MichaelHampton only b/c I thought that question would be a benefit network wide

@MatthewIfe compiled... let me test

actually i removed some getenvs too

bah

cant remember the code for that either

do you have the pastebin of mview

hah

rofl

BASTARDS!

@MatthewIfe the original?

@MDMoore313 Yes, I think you're right. I'm just surprised it hasn't been closed as a duplicate yet.

@MDMoore313 Might be a dupe on mSO... hell, I'd be surprised if it isn't, or if someone doesn't shoe-horn it into a dupe of something or other.

@MichaelHampton Awesome, checking it out

the other option is to completley refactor mview

so that you spawn a pty

and dont use a pipe directly

to trick ncurses into believing its using a tty (well, wont be a trick I guess)

in fact. might be worth before going to that effort

you said that in screen it delays too

if you run the program in screen again

then lsof dbc

see if its stdin/stdout is a pipe or pty

@MDMoore313 So, yeah, think your Q is gonna be dupe-closed on mSO fairly quickly.

@MatthewIfe bummer... getting Error opening /mview1/DBCDX.CFG with the newly compiled version

oh wait...

needs some getenvs.

i didnt add them back :-\

ah...

albeit you said it wouldnt matter

because when you ran that program it figured you sent the alarm too early

Oh, I see what's missing

@HopelessN00b Haha, someone downvoted my answer

@MatthewIfe so I think I just need a few environment variables.

@HopelessN00b that's cool, no biggie

@MichaelHampton That would be how you know it's a good answer - mSO where good ideas go to die. The fact that no one's downvoted mine yet is actually making me less confident in its value.

yeah i can fix it with the original mview pastebin

@MatthewIfe oh, the original is...

Like @MichaelHampton said, sharks....

I'm surprised the question got upvotes

@MatthewIfe pastebin.com/uPE1ZA11

I had a legitimate point here

@MDMoore313 Yeah I don't think the question was deserving of downvotes.

I've wondered it myself

@MDMoore313 Webmasters :)

@MDMoore313 Yeah, that's mSO for you. On a tangentially-related note, I find it incredibly embarrassing that our site's top-voted question is how to find the location of something burning in the server room.

@HopelessN00b let's go through and downvote it

pastebin.com/YKX4RjJU

i kept that include commented out

@JoelESalas Not gonna do much good. Next closest is 14 votes behind, and not a whole lot better, IMHO.

@HopelessN00b ROTFL, yeah. "Engage sniff test."

@HopelessN00b does it just reflect the misunderstood nature of our line of work

Or are we just disaster junkies like @ewwhite says

Not as bad as "how to sniff out burning shit in the server room," but having "copy logs, then nuke infected servers from orbit" as the top voted question is still kind of shameful.

@HopelessN00b What happened to "Our security auditor is an idiot"?

@JoelESalas No, it reflects what the SO folks find interesting about IT/ServerFault. All the highly viewed, highly voted Q's and A's (with one exception) have that in common. Got sent out across the network as "hot" or "interesting," and the SO users piled on the upvotes.

Ooh, locked posts don't show up in the questions list.

@MichaelHampton Got surpassed by lots of other questionable questions.

@HopelessN00b Again, disaster junkies

@MatthewIfe the result is interesting....

poll([{fd=0, events=POLLIN}], 1, -1)    = ? ERESTART_RESTARTBLOCK (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=3519, ...}) = 0
setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={52, 55000}}, {it_interval={0, 0}, it_value={52, 504981}}) = 0
rt_sigreturn(0)                         = -1 EINTR (Interrupted system call)

@MichaelHampton Oh, holy phucking hell. That's 1277 votes, not 127. Not sure if that's more or less embarrassing than the burning server room.

the escape doesn't seem to be passed through...

let me try something else

@HopelessN00b At least we don't have the 61 million contacts in Outlook question anymore...

It might be feasible to switch the pipes for a pty

that might work better than this godawful hack

@MichaelHampton Heh, did that get deleted? I actually found that amusing and interesting (even for how stupid it was).

Can you run dbc in screen

@HopelessN00b It was migrated to SU, they had a good laugh and then deleted it.

and tell me what dbc gets as its stdin/stdout

like a pipe or socket or pty

via lsof

@HopelessN00b And by good laugh I mean it got closed, reopened, closed again...and downvoted to -21 or so

Hmm, no escape functionality

@MichaelHampton Ah, yes. I remember hanging our mail server or fileserver (or both) trying to replicate that question.

@ewwhite it was a hack :)

Is there some kind of rootkit detection mechanism that uses the package manager to ensure files are unmodified?

@HopelessN00b So the story turns out, it was some silly Indian coder who a spammer contracted with to send a few million emails. He was finally convinced to not take the job...

@MichaelHampton deleted too? Can;t find it in search anymore :(

@HopelessN00b Yeah, it was deleted

@MatthewIfe I can't go into screen directly as a user...

but as root, and then su - to a user, I can

dbc     61368 admin    0u   CHR 136,40      0t0         43 /dev/pts/40
dbc     61368 admin    1u   CHR 136,40      0t0         43 /dev/pts/40
dbc     61368 admin    2u   CHR 136,40      0t0         43 /dev/pts/40
d

and the software likes to assign:

COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF       NODE NAME
dbc     61368 admin  cwd    DIR  230,1      126  744225313 /ppro/homedirs/pts_40

@MichaelHampton Not surprising in the least... except for maybe the bit about turning down the job. I mean, who else would even attempt to load millions of contacts into Outlook, other than a developer contracted by a spammer?

@HopelessN00b ahhh yes, I remember that

@JoelESalas yes

@MichaelHampton what was that about ?!?!?!

@ewwhite ok and that still gives you delays?

in that screen

@MDMoore313 Hehehe...I'll see if I can dig it up again

yes, but the delays are slightly lower than with mview.

if you trace dbc with it open in screen does it do that alarm() thing

if you trace with -e read,write,alarm

Where is @JourneymanGeek when you need him?

@MichaelHampton Heh. He asked on /r/sysadmin too.

@MichaelHampton lol okay if you find it go ahead and post it, I'll pop my head back in in a few

@HopelessN00b lol importing the entire populations of California and Texas are we?

@MDMoore313 No, like MH said, he was contracted by a spammer. And elected to use Outlook because... well, developer.

@matthew short break. Brb.

@MDMoore313 Here it is. Deleted, though, so you'll need 10k rep on SU to see it.

superuser.com/questions/474177/…