Commit Graph

6 Commits

Author SHA1 Message Date
Omar Sandoval
87b7292aa5 Relicense drgn from GPLv3+ to LGPLv2.1+
drgn is currently licensed as GPLv3+. Part of the long term vision for
drgn is that other projects can use it as a library providing
programmatic interfaces for debugger functionality. A more permissive
license is better suited to this goal. We decided on LGPLv2.1+ as a good
balance between software freedom and permissiveness.

All contributors not employed by Meta were contacted via email and
consented to the license change. The only exception was the author of
commit c4fbf7e589 ("libdrgn: fix for compilation error"), who did not
respond. That commit reverted a single line of code to one originally
written by me in commit 640b1c011d ("libdrgn: embed DWARF index in
DWARF info cache").

Signed-off-by: Omar Sandoval <osandov@osandov.com>
2022-11-01 17:05:16 -07:00
Omar Sandoval
45eb3eb858 tests: find tests/sample.coredump.zst more robustly
First, find the sample file relative to the test module so that tests
can be run from a different directory. Second, pass --force to zstd so
that it doesn't ignore symlinks, which is required for environments like
Buck that copy the test files as a symlinks.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
2022-03-03 11:53:21 -08:00
Omar Sandoval
12c2de2956 libdrgn: implement thread API for live processes
This implements the existing thread API methods for live processes other
than drgn_thread_stack_trace(). It also doesn't yet add support for
full-blown tracing, but it at least brings live processes to feature
parity. This is taken from the non-ptrace parts of Kevin Svetlitski's
PR #142, with some modifications.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
2022-02-12 13:33:41 -08:00
Omar Sandoval
98577e5e23 libdrgn: fix drgn_program_find_thread() for Linux kernel when thread isn't found
If a TID does not exist, then linux_helper_find_task() succeeds but
returns a null pointer object. Check for that instead of returning a
bogus thread.

Fixes: 301cc767ba ("Implement a new API for representing threads")
Signed-off-by: Omar Sandoval <osandov@osandov.com>
2022-02-12 01:16:49 -08:00
Mykola Lysenko
7580fffbdf Add drgn.Program.main_thread()
Currently only supported for user-space crash dumps. E.g. no support for
live user-space application debugging or kernel debugging.

Closes #144.

Signed-off-by: Mykola Lysenko <mykolal@fb.com>
2022-02-10 15:53:50 -08:00
Kevin Svetlitski
301cc767ba Implement a new API for representing threads
Previously, drgn had no way to represent a thread – retrieving a stack
trace (the only extant thread-specific operation) was achieved by
requiring the user to directly provide a tid.

This commit introduces the scaffolding for the design outlined in
issue #92, and implements the corresponding methods for userspace core
dumps, the live Linux kernel, and Linux kernel core dumps. Future work
will build on top of this commit to support live userspace processes.

Signed-off-by: Kevin Svetlitski <svetlitski@fb.com>
2022-01-11 17:28:17 -08:00