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/* Test program for synchronization of stdio state with file after EOF. */
#include <stdio.h>
#include <error.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
static void do_prepare (void);
#define PREPARE(argc, argv) do_prepare ()
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
static char *temp_file;
static int temp_fd;
static char *pages;
static void
do_prepare (void)
{
pages = malloc (getpagesize () * 2);
memset (pages, 'a', getpagesize ());
memset (pages + getpagesize (), 'b', getpagesize ());
temp_fd = create_temp_file ("tst-mmap2-eofsync.", &temp_file);
if (temp_fd == -1)
error (1, errno, "cannot create temporary file");
else
{
ssize_t cc = write (temp_fd, pages, getpagesize ());
if (cc != getpagesize ())
error (1, errno, "cannot write to temporary file");
}
}
static int
do_test (void)
{
const size_t pagesize = getpagesize ();
FILE *f;
char buf[pagesize];
int result = 0;
int c;
f = fopen (temp_file, "rm");
if (f == NULL)
{
perror (temp_file);
return 1;
}
if (fread (buf, pagesize, 1, f) != 1)
{
perror ("fread");
return 1;
}
if (memcmp (buf, pages, pagesize))
{
puts ("data mismatch in page 1");
result = 1;
}
printf ("feof = %d, ferror = %d immediately after fread\n",
feof (f), ferror (f));
c = fgetc (f);
if (c == EOF)
printf ("fgetc -> EOF (feof = %d, ferror = %d)\n",
feof (f), ferror (f));
else
{
printf ("fgetc returned %o (feof = %d, ferror = %d)\n",
c, feof (f), ferror (f));
result = 1;
}
c = write (temp_fd, pages + pagesize, pagesize);
if (c == (ssize_t) pagesize)
printf ("wrote more to file\n");
else
{
printf ("wrote %d != %zd (%m)\n", c, pagesize);
result = 1;
}
if (fread (buf, pagesize, 1, f) != 1)
{
printf ("second fread fails: feof = %d, ferror = %d (%m)\n",
feof (f), ferror (f));
clearerr (f);
if (fread (buf, pagesize, 1, f) != 1)
{
printf ("retry fread fails: feof = %d, ferror = %d (%m)\n",
feof (f), ferror (f));
result = 1;
}
}
if (result == 0 && memcmp (buf, pages + pagesize, pagesize))
{
puts ("data mismatch in page 2");
result = 1;
}
fseek (f, pagesize - 1, SEEK_SET);
c = fgetc (f);
if (c != 'a')
{
printf ("fgetc at end of page 1 read '%c' (%m)\n", c);
result = 1;
}
if (ftruncate (temp_fd, pagesize) < 0)
{
printf ("ftruncate failed: %m\n");
result = 1;
}
fflush (f);
c = fgetc (f);
if (c == EOF)
printf ("after truncate fgetc -> EOF (feof = %d, ferror = %d)\n",
feof (f), ferror (f));
else
{
printf ("after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n",
c, feof (f), ferror (f));
result = 1;
}
fclose (f);
return result;
}
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