src/contrib/libexecinfo, branch main

Don't rely on sys/_types.h including sys/cdefs.h

2025-06-11T16:39:01+00:00

These headers relied in __BEGIN_DECS/__END_DECLS being defined when
sys/_types.h was included, but there's not a requirement that this be
the case.

Reviewed by:	imp
Exp-run by:	antoine (PR 286274)
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1595

Pull in fix from upstream NetBSD rev. 1.5:

2020-09-21T16:43:38+00:00

    If Unwind_Backtrace is broken, ctx.n will still contain ~0, and we will
    return that which poor behavior for the user, so return 0 instead.
    We could document ~0 to be an error, but that would deviate from the
    Linux behavior which is not desirable. Noted by Poul-Henning Kamp

PR:		209842

Sync up with NetBSD libexecinfo changes 2014-2019

2019-10-26T06:59:59+00:00

Drop portions that are unlit or redundant with llvm-libunwind: builtin.c,
unwind.h, and unwind_arm_ehabi_stub.c.

This code should now work with -fPIE binaries, should we choose to build any
that way.

When backtrace() array is full, signal an error so the underlying
Itanium-style C++ exception handling library (llvm-libunwind) knows to stop
tracing instead of continuing.  (It should stop on its own when it finishes
unwinding, so this is mostly an extra seatbelt against an infinite loop bug
in the unwinder.)

Remove usage of _WITH_DPRINTF

2016-07-30T01:16:06+00:00

backtrace.3: Fix prototype of backtrace_symbols_fd_fmt().

2015-12-22T22:40:42+00:00

While here, fix a typo

Submitted by:	Sascha Wildner 
Obtained from:	DragonflyBSD

Fix typo in the function name

2015-11-05T07:43:15+00:00

Submitted by:	Sascha Wildner 
Obtained from:	DragonflyBSD

libexecinfo: Include terminating null in byte count

2013-11-21T14:12:36+00:00

Otherwise, a formatted string with a strlen equal to the remaining
buffer space would have the last character omitted (because vsnprintf
always null-terminates), and later the assert in backtrace_symbols_fmt
would fail.

MFC after:	3 days
Sponsored by:	DARPA, AFRL

Add $FreeBSD$ tag for user-facing header

2013-09-03T13:36:23+00:00

Update to 2013-08-29 NetBSD libexecinfo snapshot

2013-08-29T16:57:55+00:00

This adds my patch to use the kern.proc.pathname sysctl instead of
relying on procfs(5).

Update libexecinfo man page for FreeBSD

2013-08-23T13:47:18+00:00

Sponsored by:	DARPA, AFRL