我正在尝试检索所有系统调用的数量，并最终检索给定程序使用 ptrace 调用的系统调用的名称。我在一个 64 位系统上，所以我使用 ORIG_RAX * 8 来查找使用 ptrace 的系统调用。我目前只能检索第一个系统调用，示例运行的输出如下。有任何想法吗？
谢谢！
输出：griffinm@well $ g++ mystrace.cc
~/cs153/assn2
griffinm@well $ a.out ls
Please wait
The child made a system call 59
a.out mystrace.cc mystrace.cc~
Number of machine instructions : 252376
~/cs153/assn2
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#define ORIG_RAX 120
int main( int argc, char* argv[])
{
long long counter = 0; /* machine instruction counter */
int wait_val; /* child's return value */
int pid;
long orig_eax; /* child's process id */
puts("Please wait");
switch (pid = fork()) {
case -1:
perror("fork");
break;
case 0:
ptrace(PTRACE_TRACEME, 0, 0, 0);
execvp(argv[1], NULL);
break;
default:
wait(&wait_val);
orig_eax = ptrace(PTRACE_PEEKUSER,
pid, ORIG_RAX,
NULL);
printf("The child made a "
"system call %ld\n", orig_eax);
while (wait_val == 1407 ) {
counter++;
if (ptrace(PTRACE_SINGLESTEP, pid, 0, 0) != 0)
perror("ptrace");
wait(&wait_val);
}
}
printf("Number of machine instructions : %lld\n", counter);
return 0;
}
Update Default Case:
Default:
wait(&wait_val);
while (wait_val == 1407 ) {
counter++;
if (ptrace(PTRACE_SYSCALL, pid, 0, 0) != 0)
perror("ptrace");
orig_eax = ptrace(PTRACE_PEEKUSER,
pid, 8*ORIG_RAX,
NULL);
cout<<orig_eax<<endl;
wait(&wait_val);
}
}
编辑：
Output:
griffinm@well $ a.out pwd
Please wait
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
/home/csmajs/griffinm/cs153/assn2
-1
-1
-1
-1
-1
-1
我认为 8*Orig_RAX 是问题所在，机器是 64 位的，就像我说的那样。有任何想法吗？