@programminginc - страница 2498

Pavel

guys is there a reason why vscode with gcc on linux (ubuntu) would not show the line where a segmentation fault happened? I'm using gdb as debugger, the program execution halts when it reaces the line that causes the seg fault, but it doesn't highlight it. The call stack says paused on exception, I kinda know why there is that issue: I had linked lists, but the list was not initialized to NULL at first, at a certain point I was trying to use a printf with a string and obviously broke when it reached the garbage data, halting the program. If I run the executable directly I get in the terminal "Segmentation Fault", but vscode halts without the usual notice. There is no reason why it should hide the highlight and banner since anything else like another type of segmentation fault (trying to read a non allocated memory, dividing by zero, ect..) all give out the right banner/highlight

use bt command in gdb

Asdew

Yes I meant I could divide it in paragraphs maybe

Oh, that. Just not sending a sentence per message with multiple messages is well enough, as most people can't even do that. You even divided your message into sentences. Next time also start the message with a capital letter.

Daniele

use bt command in gdb

I'm using vscode directly and interrupting execution using breakpoints, how would I be able to pass the command?

Daniele

Oh, that. Just not sending a sentence per message with multiple messages is well enough, as most people can't even do that. You even divided your message into sentences. Next time also start the message with a capital letter.

Yea I'm not very used to do it in telegram groups, but I'll try

Artöm

I'm using vscode directly and interrupting execution using breakpoints, how would I be able to pass the command?

If you pause on breakpoint, theres a debugger window below

Pavel

If you pause on breakpoint, theres a debugger window below

That's quite obvious)

Artöm

So you type bt there

Artöm

I didnt try it in vs code though

Pavel

I'm using vscode directly and interrupting execution using breakpoints, how would I be able to pass the command?

Try using gdb shell directly

Pavel

syntax is gdb <binary build with debugging symbols>

Pavel

and then run (or r) in appeared console

Pavel

and after you get SEGFAULT backtrace (or shortly bt)

Daniele

Oh alright thank you. I was just wondering why it didn't just show the seg fault in vscode like it does usually, I guess it doesn't want to show seg faults for trying to print a neverending string with printf("%s", string)

Kenny

Man use valgrind, kinda useful

vinícius*

Man use valgrind, kinda useful

gotta Valgrind all the time

Kenny

guys is there a reason why vscode with gcc on linux (ubuntu) would not show the line where a segmentation fault happened? I'm using gdb as debugger, the program execution halts when it reaces the line that causes the seg fault, but it doesn't highlight it. The call stack says paused on exception, I kinda know why there is that issue: I had linked lists, but the list was not initialized to NULL at first, at a certain point I was trying to use a printf with a string and obviously broke when it reached the garbage data, halting the program. If I run the executable directly I get in the terminal "Segmentation Fault", but vscode halts without the usual notice. There is no reason why it should hide the highlight and banner since anything else like another type of segmentation fault (trying to read a non allocated memory, dividing by zero, ect..) all give out the right banner/highlight

.

Kenny

gotta Valgrind all the time

Lll

vinícius*

Valgrind should be step one when debugging segfaults

vinícius*

Compile your program with -g then run Valgrind and it should tell you exactly what's going wrong

Daniele

will check your solutions later, thanks guys

Pavel

Man use valgrind, kinda useful

that's almost useless lol

Kenny

What? Hahahah

Pavel

perf report is ok for profiling

Kenny

Valgrind give me all errors when i have many

Pavel

-fsanitize=address,array-bounds is ok for leak, segfault, heap-buffer overflow, etc. detection

Kenny

perf report is ok for profiling

I'll try

V01D

I just found out I totally space out when I code, because I am reviewing my code, and I found out that I have no idea how I did what I did. I have to read the source to understand it 😂. Am I the only one who does this?

Anonymous

Valgrind give me all errors when i have many

valgrind can miss errors that have been optimised away. use the sanitisers when you can

Pablo

Thanks everyone 🙏🏿

Pavel

https://ideone.com/hJWxHN Oh, why the hell std::pair is implemented so complex? It even has copy constructor and explicit default constructor defined that prevent it from being trivially constructible and trivially copyable for trivial types.

Anonymous

Ok

Anonymous

I will agree

Aakarsh

Could anyone tell me how I could print a variable of data type msgqnum_t ? I was trying to implement a message queue chat app and I needed to know the number of messages in queue

Anonymous

Could anyone tell me how I could print a variable of data type msgqnum_t ? I was trying to implement a message queue chat app and I needed to know the number of messages in queue