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* [newlib-cygwin/main] Cygwin: Don't terminate via dumper
@ 2024-01-24 13:19 Jon Turney
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From: Jon Turney @ 2024-01-24 13:19 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=15140d6df667a71e660dc9da9ca9071fa3c5dbbd
commit 15140d6df667a71e660dc9da9ca9071fa3c5dbbd
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date: Tue Jan 16 16:12:51 2024 +0000
Cygwin: Don't terminate via dumper
A process which is exiting due to a core dumping signal doesn't
propagate the correct exist status after dumping core, because 'dumper'
itself forcibly terminates the process.
Use 'dumper -n' to avoid killing the dumped process, so we continue to
the end of signal_exit(), to exit with the 128+signal exit status.
Busy-wait in exec_prepared_command() in an attempt to reliably notice
the dumper attaching, so we don't get stuck there.
Also: document these important facts for custom uses of error_start.
Diff:
---
winsup/cygwin/exceptions.cc | 7 +++----
winsup/doc/cygwinenv.xml | 6 ++++++
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index 8b1c5493e..0e1a804ca 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -149,7 +149,7 @@ dumper_init (void)
/* Calculate the length of the command, allowing for an appended DWORD PID and
terminating null */
- int cmd_len = 1 + wcslen(dll_dir) + 11 + 2 + 1 + wcslen(global_progname) + 1 + 10 + 1;
+ int cmd_len = 1 + wcslen(dll_dir) + 11 + 5 + 1 + wcslen(global_progname) + 1 + 10 + 1;
if (cmd_len > 32767)
{
/* If this comes to more than the 32,767 characters CreateProcess() can
@@ -163,7 +163,7 @@ dumper_init (void)
cp = wcpcpy (cp, L"\"");
cp = wcpcpy (cp, dll_dir);
cp = wcpcpy (cp, L"\\dumper.exe");
- cp = wcpcpy (cp, L"\" ");
+ cp = wcpcpy (cp, L"\" -n ");
cp = wcpcpy (cp, L"\"");
cp = wcpcpy (cp, global_progname);
wcscat (cp, L"\"");
@@ -570,9 +570,8 @@ int exec_prepared_command (PWCHAR command)
system_printf ("Failed to start, %E");
else
{
- SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_IDLE);
while (!being_debugged ())
- Sleep (1);
+ Sleep (0);
Sleep (2000);
}
diff --git a/winsup/doc/cygwinenv.xml b/winsup/doc/cygwinenv.xml
index d97f2b77d..05672c404 100644
--- a/winsup/doc/cygwinenv.xml
+++ b/winsup/doc/cygwinenv.xml
@@ -46,6 +46,12 @@ to the command as arguments.
Note: This has no effect if a debugger is already attached when the fatal
error occurs.
</para>
+<para>
+ Note: The command invoked must either (i) attach to the errored process with
+ <function>DebugActiveProcess()</function>, or (ii) forcibly terminate the
+ errored process (with <function>TerminateProcess()</function> or similar), as
+ otherwise the errored process will wait forever for a debugger to attach.
+</para>
</listitem>
<listitem>
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