How can I enable coredump in macos

Asked Sep 29 '21 at 17:54

Active Sep 29 '21 at 18:01

Viewed 214 times

The following code can cause core dump

#include <cstdio>
int main(){
    printf("%d", *((int*)1));
}

However when I run on my mac, there is no coredump generated in /cores

calvin@CalvinPC test % ./a
zsh: segmentation fault  ./a
calvin@CalvinPC test % ls -a /cores
.   ..

However, I already have ulimit -c unlimited, and sudo sysctl kern.coredump=1

So, how can I cause a core dump in macos?

edited Sep 29 '21 at 18:01

asked Sep 29 '21 at 17:54

calvin

undefined beahvior is undefined. Your code example *can* cause something, but it can also cause anything else – 463035818_is_not_an_ai Sep 29 '21 at 17:55
2

@463035818_is_not_a_number Since it already causes a segev, why does not it coredump? – calvin Sep 29 '21 at 17:56
oh ok, I think now I understand the question – 463035818_is_not_an_ai Sep 29 '21 at 17:56
Are you setting ulimit in the same window you run the program? According to this answer, it is for the terminal session. https://stackoverflow.com/a/2080938/4238087 Also, you should be able to use abort() to do the same but POSIX compliant. – russianfool Sep 29 '21 at 18:15
Last time I tried, `ulimit -c unlimited` worked on macOS for me. – prapin Sep 29 '21 at 18:50

0 Answers0