some codes

suid_test.c

#include <stdio.h>
#include <stdlib.h>
int main()
{
   char sometext[256];
   FILE *fptr;
   fptr = fopen("/tmp/suid_test.txt","w");

   if(fptr == NULL)
   {
      printf("Error!");
      exit(1);
   }

   printf("Enter some text: ");
   scanf("%s",&sometext);

   fprintf(fptr,"%s\n",sometext);
   fclose(fptr);

   return 0;
}