syscall.c

这是一本操作系统辅导教材的辅助资料

#include <linux/unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>

_syscall2(int,getmm,pid_t,pid,unsigned long*,arr)

void Usage();

int main(int argc,char *argv[])
{
  int ret=0;
  pid_t pid;
  static unsigned long array[15];

  if (argc!=2) {
    Usage();
    goto out;
  }
  pid=(pid_t)atoi(argv[1]);
  ret=getmm(pid,array);
  if (ret==-1) {
	printf("syscall:Invalid pid or syscall error\n");
	goto out;
  }
  printf("pid %d memory map:\n",pid);
  printf("start_code:\t%x\n",array[0]);
  printf("end_code:\t%x\n",array[1]);
  printf("start_data:\t%x\n",array[2]);
  printf("end_data:\t%x\n",array[3]);
  printf("start_brk:\t%x\n",array[4]);
  printf("brk:\t\t%x\n",array[5]);
  printf("start_stack:\t%x\n",array[6]);
  printf("arg_start:\t%x\n",array[7]);
  printf("arg_end:\t%x\n",array[8]);
  printf("env_start:\t%x\n",array[9]);
  printf("env_end:\t%x\n",array[10]);
out:
  return ret;
}

void Usage()
{
  printf("Usage: ./syscall [pid]\n");
}