Radare2: backtrace on BSD systems

[XVilka]

It requires libexecinfo, so r2 buildsystem should check its presence.

[XVilka]

Based on https://github.com/radare/radare2/issues/4900

[radare]

R2 builds fine in fbsd for me

[radare]

can anyone testing r2 in netbsd and openbsd?

[XVilka]

@radare - yes, it should, because we disabled backtrace at all for *BSD.
But this bug is about checking libexecinfo dependency presence in the configure/makefile for *BSD systems, so users can enjoy backtrace on those systems too.

[radare]

Aah ok

On 18 May 2016, at 12:54, Anton Kochkov [email protected] wrote:

@radare - yes, it should, because we disabled backtrace at all for *BSD.
But this bug is about checking libexecinfo dependency presence in the configure/makefile for *BSD systems, so users can enjoy backtrace on those systems too.

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[radare]

can we close this now?

[XVilka]

No, it's not solved yet.

[radare]

we have #if (__linux__ && __GNU_LIBRARY__) || (__APPLE__ && APPLE_WITH_BACKTRACE) || defined(NETBSD_WITH_BACKTRACE) ... whats missing here? which specific bsd are you talking about? this is in libc, no need for execinfo imho

[XVilka]

libexecinfo is still required. Just try it yourself on FreeBSD for example

[XVilka]

@krytarowski @mscherer may be you can help here

[krytarowski]

Unless someone broke NetBSD, I got backtrace in the past and it worked correctly.

NAME
     backtrace - fill in the backtrace of the currently executing thread

LIBRARY
     Backtrace Information Library (libexecinfo, -lexecinfo)

SYNOPSIS
     #include <execinfo.h>

     size_t
     backtrace(void **addrlist, size_t len);

     char **
     backtrace_symbols(void * const *addrlist, size_t len);

     int
     backtrace_symbols_fd(void * const *addrlist, size_t len, int fd);

     char **
     backtrace_symbols_fmt(void * const *addrlist, size_t len,
         const char *fmt);

     int
     backtrace_symbols_fd_fmt(void * const *addrlist, size_t len, int fd,
         const char *fmt);

[krytarowski]

NetBSD requires -lexecinfo.

[mscherer]

I get the same output on Linux and FreeBSD when I use r2 -d /bin/ls and 'dbt', and no issue from building a fresh git checkout. FreeBSD has backtrace since FreeBSD 10.0 in the base system so I suspect that's the reason it work.

[radare]

@Cka3o4Huk do you wanna take a look at this issue?

[mizhka]

@radare never tried this feature before.
My first try (FreeBSD 12-CURRENT, radare 1.6.0):

What is expected result?

[Maijin]

That's too old please try with the latest git version of radare2