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fflush.c

/*
 * Copyright (c) 2000-2001, 2005, 2006 Sendmail, Inc. and its suppliers.
 *      All rights reserved.
 * Copyright (c) 1990, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 */

#include <sm/gen.h>
SM_RCSID("@(#)$Id: fflush.c,v 1.45 2006/03/03 22:25:00 ca Exp $")
#include <unistd.h>
#include <errno.h>
#include <sm/time.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <sm/io.h>
#include <sm/assert.h>
#include <sm/setjmp.h>
#include "local.h"
#include <sm/conf.h>

/*
**  SM_IO_FLUSH -- flush the buffer for a 'fp' to the "file"
**
**  Flush a single file. We don't allow this function to flush
**  all open files when fp==NULL any longer.
**
**    Parameters:
**          fp -- the file pointer buffer to flush
**          timeout -- time to complete the flush
**
**    Results:
**          Failure: SM_IO_EOF and sets errno
**          Success: 0 (zero)
*/

int
sm_io_flush(fp, timeout)
      register SM_FILE_T *fp;
      int SM_NONVOLATILE timeout;
{
#ifndef WIN32
      int fd;
      struct timeval to;
#endif /* !WIN32 */

      SM_REQUIRE_ISA(fp, SmFileMagic);

      if ((fp->f_flags & (SMWR | SMRW)) == 0)
      {
            /*
            **  The file is not opened for writing, so it cannot be flushed
            **  (writable means SMWR [write] or SMRW [read/write].
            */

            errno = EBADF;
            return SM_IO_EOF;
      }

      SM_CONVERT_TIME(fp, fd, timeout, &to);

      /* Now do the flush */
      return sm_flush(fp, (int *) &timeout);
}

/*
**  SM_FLUSH -- perform the actual flush
**
**  Assumes that 'fp' has been validated before this function called.
**
**    Parameters:
**          fp -- file pointer to be flushed
**          timeout -- max time allowed for flush (milliseconds)
**
**    Results:
**          Success: 0 (zero)
**          Failure: SM_IO_EOF and errno set
**
**    Side Effects:
**          timeout will get updated with the time remaining (if any)
*/

int
sm_flush(fp, timeout)
      register SM_FILE_T *fp;
      int *timeout;
{
      register unsigned char *p;
      register int n, t;
      int fd;

      SM_REQUIRE_ISA(fp, SmFileMagic);

      t = fp->f_flags;
      if ((t & SMWR) == 0)
            return 0;

      if (t & SMSTR)
      {
            *fp->f_p = '\0';
            return 0;
      }

      if ((p = fp->f_bf.smb_base) == NULL)
            return 0;

      n = fp->f_p - p;        /* write this much */

      if ((fd = sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL)) == -1)
      {
            /* can't get an fd, likely internal 'fake' fp */
            errno = 0;
            fd = -1;
      }

      /*
      **  Set these immediately to avoid problems with longjmp and to allow
      **  exchange buffering (via setvbuf) in user write function.
      */

      fp->f_p = p;
      fp->f_w = t & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; /* implies SMFBF */

      for (; n > 0; n -= t, p += t)
      {
            errno = 0; /* needed to ensure EOF correctly found */

            /* Call the file type's write function */
            t = (*fp->f_write)(fp, (char *)p, n);
            if (t <= 0)
            {
                  if (t == 0 && errno == 0)
                        break; /* EOF found */

                  if (IS_IO_ERROR(fd, t, *timeout))
                  {
                        fp->f_flags |= SMERR;

                        /* errno set by fp->f_write */
                        return SM_IO_EOF;
                  }
                  SM_IO_WR_TIMEOUT(fp, fd, *timeout);
                  t = 0;
            }
      }
      return 0;
}

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