main.c

text/x-csrc

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, const char* argv[])
{
   FILE* f;
   int fd;
   void* m;
   ssize_t written;

   f = fopen("test.bin", "w+");
   if (f == NULL)
   {
      printf("Cannot open file\n");
      exit(0);
   }
   fd = fileno(f);
   m = malloc((size_t)8192);
   // memset(m, 0, (size_t)8192); <-- will make valgrind succeed

   written = pwrite(fd, m, (size_t)8192, (off_t)0);
   
   printf("Written: %i\n", written);

   free(m);
   fclose(f);
   
   return 0;
}