Question

I have a process which suddenly hanged and is not giving any core dump and is also not killed.i can see it still running using the ps command.

how can i know which statement it is currently executing inside the code.

basically i want to know where exactly it got hanged.

language is c++ and platform is solaris unix.

demos.283> cat test3.cc
#include<stdio.h>
#include<unistd.h>

int main()
{

sleep(100);
return 0;

}
demos.284> CC test3.cc 
demos.285> ./a.out &
[1] 2231
demos.286> ps -o "pid,wchan,comm"
  PID            WCHAN COMMAND
23420 fffffe86e9a5aff6 -tcsh
 2345                - ps
 2231 ffffffffb8ca3376 ./a.out
demos.290> ps
   PID TTY         TIME CMD
  3823 pts/36      0:00 ps
 23420 pts/36      0:00 tcsh
  3822 pts/36      0:00 a.out
demos.291> pstack 3822
3822:   ./a.out
 fed1a215 nanosleep (80478c0, 80478c8)
 080508ff main     (1, 8047920, 8047928, fed93ec0) + f
 0805085d _start   (1, 8047a4c, 0, 8047a54, 8047a67, 8047c05) + 7d
demos.292> 

Answer 1

you can try with pstack passing pid as parameter. You can use ps to get the process id (pid)

For example: pstack 1267