Bug#60807: fgetpos() fails on read only filesystems

[Marcus Brinkmann]

Hi,

the attached program gives EROFS at fgetpos() when called with FILE being
on a read-only filesystem. I had no debug symbols installed, so I didn't
track it down any further yet. From reading the stdio/fgetpos.c and ftell.c,
I couldn't see how the filesystem was accessed even. 

Thanks,
Marcus

-- 
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#include <stdio.h>
#include <string.h>
#include <errno.h>

main(int argc, char *argv[])
{
FILE *f;
fpos_t fpos;

  if (argc != 2) {
     printf("Usage: %s FILE\n", argv[0]);
     return;
  }
  f = fopen(argv[1], "r");
  if (!f) {
     printf ("fopen: %s\n", strerror(errno));
     return;
  }
  if (0 != fgetpos(f, &fpos)) {
     printf ("fgetpos: %s\n", strerror(errno));
  }
  fclose(f);
}