/* Test for bug in fflush synchronization behavior.  */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

static char *fname;

static void prepare (void);

#define PREPARE(argc, argv) prepare ()

#define TEST_FUNCTION do_test ()

static int do_test (void);

#include "../test-skeleton.c"

static void

prepare (void)

{

  int fd = create_temp_file ("bug-mmap-fflush.", &fname);

  if (fd == -1)

    exit (3);

  /* We don't need the descriptor.  */

  close (fd);

}

static int

do_test (void)

{

  FILE *f;

  off_t o;

  char buffer[1024];

  snprintf (buffer, sizeof (buffer), "echo 'From foo@bar.com' > %s", fname);

  system (buffer);

  f = fopen (fname, "r");

  fseek (f, 0, SEEK_END);

  o = ftello (f);

  fseek (f, 0, SEEK_SET);

  fflush (f);

  snprintf (buffer, sizeof (buffer), "echo 'From bar@baz.edu' >> %s", fname);

  system (buffer);

  fseek (f, o, SEEK_SET);

  if (fgets (buffer, 1024, f) == NULL)

    exit (1);

  if (strncmp (buffer, "From ", 5) != 0)

    exit (1);

  fclose (f);

  exit (0);

}