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/* Test program for synchronization of stdio state with file after fflush. */
#include <stdio.h>
#include <error.h>
#include <errno.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 text1[] = "Line the first\n";
static char text2[] = "Line the second\n";
static void
do_prepare (void)
{
temp_fd = create_temp_file ("tst-mmap-eofsync.", &temp_file);
if (temp_fd == -1)
error (1, errno, "cannot create temporary file");
else
{
ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
if (cc != sizeof text1 - 1)
error (1, errno, "cannot write to temporary file");
}
}
static int
do_test (void)
{
FILE *f;
char buf[128];
int result = 0;
int c;
f = fopen (temp_file, "r");
if (f == NULL)
{
perror (temp_file);
return 1;
}
if (fgets (buf, sizeof buf, f) == NULL)
{
perror ("fgets");
return 1;
}
if (strcmp (buf, text1))
{
printf ("read \"%s\", expected \"%s\"\n", buf, text1);
result = 1;
}
printf ("feof = %d, ferror = %d immediately after fgets\n",
feof (f), ferror (f));
if (fflush (f) != 0)
{
printf ("fflush failed! %m\n");
result = 1;
}
c = write (temp_fd, text2, sizeof text2 - 1);
if (c == sizeof text2 - 1)
printf ("wrote more to file\n");
else
{
printf ("wrote %d != %zd (%m)\n", c, sizeof text2 - 1);
result = 1;
}
if (fgets (buf, sizeof buf, f) == NULL)
{
printf ("second fgets fails: feof = %d, ferror = %d (%m)\n",
feof (f), ferror (f));
clearerr (f);
if (fgets (buf, sizeof buf, f) == NULL)
{
printf ("retry fgets fails: feof = %d, ferror = %d (%m)\n",
feof (f), ferror (f));
result = 1;
}
}
if (result == 0 && strcmp (buf, text2))
{
printf ("second time read \"%s\", expected \"%s\"\n", buf, text2);
result = 1;
}
fclose (f);
return result;
}
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