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glibc  2.9
Functions
tst-fseek.c File Reference
#include <error.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/stat.h>

Go to the source code of this file.

Functions

int main (void)

Function Documentation

int main ( void  )

Definition at line 32 of file tst-fseek.c.

{
  const char *tmpdir;
  char *fname;
  int fd;
  FILE *fp;
  const char outstr[] = "hello world!\n";
  char strbuf[sizeof outstr];
  char buf[200];
  struct stat64 st1;
  struct stat64 st2;
  int result = 0;

  tmpdir = getenv ("TMPDIR");
  if (tmpdir == NULL || tmpdir[0] == '\0')
    tmpdir = "/tmp";

  asprintf (&fname, "%s/tst-fseek.XXXXXX", tmpdir);
  if (fname == NULL)
    error (EXIT_FAILURE, errno, "cannot generate name for temporary file");

  /* Create a temporary file.   */
  fd = mkstemp (fname);
  if (fd == -1)
    error (EXIT_FAILURE, errno, "cannot open temporary file");

  fp = fdopen (fd, "w+");
  if (fp == NULL)
    error (EXIT_FAILURE, errno, "cannot get FILE for temporary file");

  setbuffer (fp, strbuf, sizeof (outstr) -1);

  if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: write error\n", __LINE__);
      result = 1;
      goto out;
    }

  /* The EOF flag must be reset.  */
  if (fgetc (fp) != EOF)
    {
      printf ("%d: managed to read at end of file\n", __LINE__);
      result = 1;
    }
  else if (! feof (fp))
    {
      printf ("%d: EOF flag not set\n", __LINE__);
      result = 1;
    }
  if (fseek (fp, 0, SEEK_CUR) != 0)
    {
      printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
      result = 1;
    }
  else if (feof (fp))
    {
      printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
      result = 1;
    }

  /* Do the same for fseeko().  */
    if (fgetc (fp) != EOF)
    {
      printf ("%d: managed to read at end of file\n", __LINE__);
      result = 1;
    }
  else if (! feof (fp))
    {
      printf ("%d: EOF flag not set\n", __LINE__);
      result = 1;
    }
  if (fseeko (fp, 0, SEEK_CUR) != 0)
    {
      printf ("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
      result = 1;
    }
  else if (feof (fp))
    {
      printf ("%d: fseek() didn't reset EOF flag\n", __LINE__);
      result = 1;
    }

  /* Go back to the beginning of the file: absolute.  */
  if (fseek (fp, 0, SEEK_SET) != 0)
    {
      printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  /* Now with fseeko.  */
  if (fseeko (fp, 0, SEEK_SET) != 0)
    {
      printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  /* Go back to the beginning of the file: relative.  */
  if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
    {
      printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  /* Now with fseeko.  */
  if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_CUR) != 0)
    {
      printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  /* Go back to the beginning of the file: from the end.  */
  if (fseek (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
    {
      printf ("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  /* Now with fseeko.  */
  if (fseeko (fp, -((int) sizeof (outstr) - 1), SEEK_END) != 0)
    {
      printf ("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
      result = 1;
    }
  else if (fflush (fp) != 0)
    {
      printf ("%d: fflush() failed\n", __LINE__);
      result = 1;
    }
  else if (lseek (fd, 0, SEEK_CUR) != 0)
    {
      printf ("%d: lseek() returned different position\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: fread() failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0)
    {
      printf ("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
      result = 1;
    }

  if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: write error 2\n", __LINE__);
      result = 1;
      goto out;
    }

  if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: write error 3\n", __LINE__);
      result = 1;
      goto out;
    }

  if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: write error 4\n", __LINE__);
      result = 1;
      goto out;
    }

  if (fwrite (outstr, sizeof (outstr) - 1, 1, fp) != 1)
    {
      printf ("%d: write error 5\n", __LINE__);
      result = 1;
      goto out;
    }

  if (fputc ('1', fp) == EOF || fputc ('2', fp) == EOF)
    {
      printf ("%d: cannot add characters at the end\n", __LINE__);
      result = 1;
      goto out;
    }

  /* Check the access time.  */
  if (fstat64 (fd, &st1) < 0)
    {
      printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
      result = 1;
    }
  else
    {
      sleep (1);

      if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_CUR) != 0)
       {
         printf ("%d: fseek() after write characters failed\n", __LINE__);
         result = 1;
         goto out;
       }
      else
       {

         time_t t;
         /* Make sure the timestamp actually can be different.  */
         sleep (1);
         t = time (NULL);

         if (fstat64 (fd, &st2) < 0)
           {
             printf ("%d: fstat64() after fseeko() failed\n\n", __LINE__);
             result = 1;
           }
         if (st1.st_ctime >= t)
           {
             printf ("%d: st_ctime not updated\n", __LINE__);
             result = 1;
           }
         if (st1.st_mtime >= t)
           {
             printf ("%d: st_mtime not updated\n", __LINE__);
             result = 1;
           }
         if (st1.st_ctime >= st2.st_ctime)
           {
             printf ("%d: st_ctime not changed\n", __LINE__);
             result = 1;
           }
         if (st1.st_mtime >= st2.st_mtime)
           {
             printf ("%d: st_mtime not changed\n", __LINE__);
             result = 1;
           }
       }
    }

  if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
      != 2 + 2 * (sizeof (outstr) - 1))
    {
      printf ("%d: reading 2 records plus bits failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
          || memcmp (&buf[sizeof (outstr) - 1], outstr,
                    sizeof (outstr) - 1) != 0
          || buf[2 * (sizeof (outstr) - 1)] != '1'
          || buf[2 * (sizeof (outstr) - 1) + 1] != '2')
    {
      printf ("%d: reading records failed\n", __LINE__);
      result = 1;
    }
  else if (ungetc ('9', fp) == EOF)
    {
      printf ("%d: ungetc() failed\n", __LINE__);
      result = 1;
    }
  else if (fseek (fp, -(2 + 2 * (sizeof (outstr) - 1)), SEEK_END) != 0)
    {
      printf ("%d: fseek after ungetc failed\n", __LINE__);
      result = 1;
    }
  else if (fread (buf, 1, 2 + 2 * (sizeof (outstr) - 1), fp)
      != 2 + 2 * (sizeof (outstr) - 1))
    {
      printf ("%d: reading 2 records plus bits failed\n", __LINE__);
      result = 1;
    }
  else if (memcmp (buf, outstr, sizeof (outstr) - 1) != 0
          || memcmp (&buf[sizeof (outstr) - 1], outstr,
                    sizeof (outstr) - 1) != 0
          || buf[2 * (sizeof (outstr) - 1)] != '1')
    {
      printf ("%d: reading records for the second time failed\n", __LINE__);
      result = 1;
    }
  else if (buf[2 * (sizeof (outstr) - 1) + 1] == '9')
    {
      printf ("%d: unget character not ignored\n", __LINE__);
      result = 1;
    }
  else if (buf[2 * (sizeof (outstr) - 1) + 1] != '2')
    {
      printf ("%d: unget somehow changed character\n", __LINE__);
      result = 1;
    }

  fclose (fp);

  fp = fopen (fname, "r");
  if (fp == NULL)
    {
      printf ("%d: fopen() failed\n\n", __LINE__);
      result = 1;
    }
  else if (fstat64 (fileno (fp), &st1) < 0)
    {
      printf ("%d: fstat64() before fseeko() failed\n\n", __LINE__);
      result = 1;
    }
  else if (fseeko (fp, 0, SEEK_END) != 0)
    {
      printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
      result = 1;
    }
  else if (ftello (fp) != st1.st_size)
    {
      printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
             (size_t) st1.st_size, (size_t) ftello (fp));
      result = 1;
    }
  else
    printf ("%d: SEEK_END works\n", __LINE__);
  if (fp != NULL)
    fclose (fp);

  fp = fopen (fname, "r");
  if (fp == NULL)
    {
      printf ("%d: fopen() failed\n\n", __LINE__);
      result = 1;
    }
  else if (fstat64 (fileno (fp), &st1) < 0)
    {
      printf ("%d: fstat64() before fgetc() failed\n\n", __LINE__);
      result = 1;
    }
  else if (fgetc (fp) == EOF)
    {
      printf ("%d: fgetc() before fseeko() failed\n\n", __LINE__);
      result = 1;
    }
  else if (fseeko (fp, 0, SEEK_END) != 0)
    {
      printf ("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
      result = 1;
    }
  else if (ftello (fp) != st1.st_size)
    {
      printf ("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
             (size_t) st1.st_size, (size_t) ftello (fp));
      result = 1;
    }
  else
    printf ("%d: SEEK_END works\n", __LINE__);
  if (fp != NULL)
    fclose (fp);

 out:
  unlink (fname);

  return result;
}

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