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Fix debugger attach when ptrace is restricted

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Trick's backtrace or attach functionality fails on systems like Ubuntu
where the use of ptrace(2) is restricted. Where it is defined, use the
PR_SET_PTRACER prctl with the argument PR_SET_PTRACER_ANY to allow any
process to attach.
This commit is contained in:
Thadeus Fleming 2018-05-10 07:13:12 -05:00
parent ba2df0757e
commit 54fe22684a
1 changed files with 10 additions and 0 deletions
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10
trick_source/sim_services/Executive/Executive.cpp
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@ -2,6 +2,9 @@
#include <iostream>
#include <math.h>
#include <sys/stat.h>
#if __linux
#include <sys/prctl.h>
#endif
#include "trick/Executive.hh"
#include "trick/ExecutiveException.hh"
@ -48,6 +51,13 @@ Trick::Executive::Executive() {
software_frame = 1.0;
frame_count = 0 ;
stack_trace = true ;
/** @li (if on new-enough Linux) allow any process to ptrace this one.
* This allows stack trace / debugger attach when ptrace is
* restricted (e.g. on Ubuntu 16).
*/
#if defined(PR_SET_PTRACER) && defined(PR_SET_PTRACER_ANY)
prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);
#endif
/** @li Assign default terminate time to MAX_LONG_LONG tics. */
terminate_time = TRICK_MAX_LONG_LONG - 1;
time_last_pass_tics = 0 ;