代码

#include <stdio.h>
#include <sys/auxv.h>
typedef unsigned long long u64;
struct DI { u64 abi; const char*in; u64 insz; char*out; u64 outlim; u64 outsz; char*err;
            u64 errlim; u64 errsz; const char*IB; u64 IBlim; char*OB; u64 OBlim; u64 tscfreq; }
            __attribute__((packed));
extern char **environ;
int main(int argc, char**argv){
  DI* d=(DI*)getauxval(0x6b637564);
  printf("argc=%d\n",argc);
  for(int i=0;i<argc && i<8;i++) printf("argv[%d]=[%s]\n",i,argv[i]?argv[i]:"(null)");
  if(d){ printf("insz=%llu in0=[%.40s]\n",d->insz,d->in?d->in:"(null)");
         printf("outlim=%llu IBlim=%llu OBlim=%llu tsc=%llu\n",d->outlim,d->IBlim,d->OBlim,d->tscfreq); }
  int e=0; if(environ) while(environ[e] && e<12) e++;
  printf("n_env=%d\n",e);
  for(int i=0;i<e && i<6;i++) printf("env[%d]=[%s]\n",i,environ[i]);
  return 0;
}

评测结果