+
+ +
+

Debugging

+

Sometimes for debugging need to build accel-ppp with additional flags:

+

-DCMAKE_BUILD_TYPE=Debug - Include debug information to accel-pppd binary

+

-DCMAKE_C_FLAGS='-g -O0' - Enable optimization flags

+

-DMEMDEBUG=TRUE - Set this flag if you want to debug memleak

+

Allow create core dump files without size limiting, edit /etc/security/limits.conf and add

+
*  soft  core  unlimited
+
+
+

Or run ulimit -c unlimited for apply immediately

+

Edit /etc/sysctl.conf to define core dump file name and location, add

+
kernel.core_uses_pid = 1
+kernel.core_pattern = /root/core-%e-%p
+
+
+

And apply sysctl -p

+

If accel-ppp runs as systemd service to allow create coredumps it is necessary to add DefaultLimitCORE=infinity to /etc/systemd/system.conf and run systemctl daemon-reexec to activate new params.

+

Recommended: to create a self-checking program with predefined mistake. Create test.c with the following content

+
int main() {
+  *(char *)0 = 0;
+  return 0;
+}
+
+
+

Compile this program gcc test.c and run ./a.out

+

If core files appear in /root directory and in dmesg exist output a.out[xxxx]: segfault at ... then all done properly.

+

Run accel-ppp in GDB (GNU Debugger)

+

If you want to run accel-ppp in GDB, necessary disable logratation for accel-ppp log files.

+
gdb -ex=run  --args accel-pppd -c /etc/accel-ppp.conf -p /var/run/accel-ppp.pid
+
+
+
+ + +
+