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152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
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* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: fflush.c,v 1.43 2001/09/11 04:04:48 gshapiro Exp $")
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#include <unistd.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sm/io.h>
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#include <sm/assert.h>
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#include <sm/setjmp.h>
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#include "local.h"
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#include <sm/conf.h>
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/*
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** SM_IO_FLUSH -- flush the buffer for a 'fp' to the "file"
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**
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** Flush a single file. We don't allow this function to flush
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** all open files when fp==NULL any longer.
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**
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** Parameters:
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** fp -- the file pointer buffer to flush
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** timeout -- time to complete the flush
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**
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** Results:
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** Failure: SM_IO_EOF and sets errno
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** Success: 0 (zero)
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*/
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int
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sm_io_flush(fp, timeout)
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register SM_FILE_T *fp;
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int SM_NONVOLATILE timeout;
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{
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int fd;
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struct timeval to;
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SM_REQUIRE_ISA(fp, SmFileMagic);
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if ((fp->f_flags & (SMWR | SMRW)) == 0)
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{
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/*
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** The file is not opened for writing, so it cannot be flushed
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** (writable means SMWR [write] or SMRW [read/write].
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*/
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errno = EBADF;
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return SM_IO_EOF;
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}
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SM_CONVERT_TIME(fp, fd, timeout, &to);
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/* Now do the flush */
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return sm_flush(fp, (int *) &timeout);
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}
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/*
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** SM_FLUSH -- perform the actual flush
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**
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** Assumes that 'fp' has been validated before this function called.
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**
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** Parameters:
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** fp -- file pointer to be flushed
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** timeout -- max time allowed for flush (milliseconds)
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**
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** Results:
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** Success: 0 (zero)
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** Failure: SM_IO_EOF and errno set
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**
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** Side Effects:
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** timeout will get updated with the time remaining (if any)
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*/
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int
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sm_flush(fp, timeout)
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register SM_FILE_T *fp;
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int *timeout;
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{
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register unsigned char *p;
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register int n, t;
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int fd;
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SM_REQUIRE_ISA(fp, SmFileMagic);
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t = fp->f_flags;
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if ((t & SMWR) == 0)
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return 0;
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if (t & SMSTR)
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{
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*fp->f_p = '\0';
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return 0;
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}
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if ((p = fp->f_bf.smb_base) == NULL)
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return 0;
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n = fp->f_p - p; /* write this much */
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if ((fd = sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL)) == -1)
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{
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/* can't get an fd, likely internal 'fake' fp */
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errno = 0;
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fd = -1;
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}
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/*
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** Set these immediately to avoid problems with longjmp and to allow
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** exchange buffering (via setvbuf) in user write function.
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*/
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fp->f_p = p;
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fp->f_w = t & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; /* implies SMFBF */
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for (; n > 0; n -= t, p += t)
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{
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errno = 0; /* needed to ensure EOF correctly found */
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/* Call the file type's write function */
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t = (*fp->f_write)(fp, (char *)p, n);
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if (t <= 0)
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{
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if (t == 0 && errno == 0)
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break; /* EOF found */
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if (IS_IO_ERROR(fd, t, *timeout))
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{
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fp->f_flags |= SMERR;
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/* errno set by fp->f_write */
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return SM_IO_EOF;
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}
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SM_IO_WR_TIMEOUT(fp, fd, *timeout);
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}
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}
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return 0;
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}
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