lseek error on block device

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Date: Sun, 30 May 2004 03:52:28 -0500

$ uname -a
AIX luna 2 5 0043880C4C00
$ oslevel -r
5200-01
$ lslpp -L bos.rte.libc
  Fileset Level State Type Description
(Uninstaller)
  ----------------------------------------------------------------------------
  bos.rte.libc 5.2.0.17 C F libc Library

$ cat size.c
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

int
main (void) {
  int fd;
  off_t size;

  fd = open ("/dev/lv00", O_RDONLY);
  if (fd == -1) {
    printf ("%s\n", strerror (errno));
    exit (1);
  }

  size = lseek (fd, 0, SEEK_END);
  if (size == -1)
    exit (2);

  printf ("size: %lu\n", size);
  close (fd);
}
$ xlc size.c
$ ./a.out
size: 0

Why doesn't lseek on a block device to SEEK_END return the size of the
block device? Is this operation unsupported? On Solaris 9, lseek returns
the size of the block device.

-- 
albert chin (china @at@ thewrittenword .dot. com)

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