File: attach.c

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/* This program is intended to be started outside of gdb, and then
   attached to by gdb.  Thus, it simply spins in a loop.  The loop
   is exited when & if the variable 'should_exit' is non-zero.  (It
   is initialized to zero in this program, so the loop will never
   exit unless/until gdb sets the variable to non-zero.)
   */
#include <stdio.h>
#include <unistd.h>

int  should_exit = 0;

int main ()
{
  int  local_i = 0;

  alarm (60);

  while (! should_exit)
    {
      local_i++;
    }
  return 0; /* postloop */
}