/*
* Copyright (c) 2000-2001, 2005, 2006 Proofpoint, 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 1.46 2013-11-22 20:51:42 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;
{
int fd;
struct timeval to;
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;
}