Attachment 149481 Details for Bug 228816 – modified test program

modified test program

ptrace-thrash.c (text/x-csrc), 1.24 KB, created by Roland McGrath on 2007-03-07 19:40:38 UTC

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Filename:

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Creator: Roland McGrath

Created: 2007-03-07 19:40:38 UTC

Size: 1.24 KB

patch

obsolete

>#include <stdlib.h>
>#include <errno.h>
>#include <stdio.h>
>#include <unistd.h>
>#include <pthread.h>
>#include <sys/ptrace.h>
>#include <signal.h>
>
>static void *thread_func(void *arg)
>{
>	execl("/proc/self/exe", NULL);
>	return NULL;
>}
>
>int main(int argc, const char *argv[])
>{
>	pthread_t thread;
>	int pid, n;
>
>	int a = 1, d = 1;
>
>	if (argc > 1)
>	  switch (argv[1][0])
>	    {
>	    case 'a': d = 0;break;
>	    case 'd': a = 0;break;
>	    }
>
>	if (argv[0] && (pid = fork()))
>		for (n = 1; /*n < 1000000*/; ++n) {
>
>		  static unsigned long counts[2][200];
>		  inline void do_ptrace(int req, int idx)
>		    {
>		      int rc = ptrace(req, pid, NULL, 0) == 0 ? 0 : errno?:-1;
>		      if (rc>=200 || rc<0)
>			abort();
>		      counts[idx][rc]++;
>		    }
>		  if (a || n == 1)
>			do_ptrace(PTRACE_ATTACH, 0);
>		  if (d)
>			do_ptrace(PTRACE_DETACH, 1);
>
>			if (!(n % 100000)) {
>			  printf("passed: %d (%s)", n,
>				 (a&&d)?"a/d":a?"a":"d");
>				for (int i = 0; i < 200; ++i)
>				  if (counts[0][i] || counts[1][i]) {
>				    printf("; %d (%lu/%lu)",
>					   i, counts[0][i], counts[1][i]);
>				    counts[0][i] = counts[1][i] = 0;
>				  }
>				puts("");
>			}
>		}
>
>	if (pthread_create(&thread, NULL, thread_func, NULL))
>		perror("pthread_create");
>
>	while (1)
>		pause();
>	return 1;
>}

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Attachments on bug 228816: 149446 | 149481 | 149546