2 * Copyright (c) 2000-2001, 2005, 2006 Sendmail, Inc. and its suppliers.
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * By using this file, you agree to the terms and conditions set
11 * forth in the LICENSE file which can be found at the top level of
12 * the sendmail distribution.
16 SM_RCSID("@(#)$Id: fflush.c,v 1.45 2006/03/03 22:25:00 ca Exp $")
24 #include <sm/assert.h>
25 #include <sm/setjmp.h>
30 ** SM_IO_FLUSH -- flush the buffer for a 'fp' to the "file"
32 ** Flush a single file. We don't allow this function to flush
33 ** all open files when fp==NULL any longer.
36 ** fp -- the file pointer buffer to flush
37 ** timeout -- time to complete the flush
40 ** Failure: SM_IO_EOF and sets errno
45 sm_io_flush(fp, timeout)
46 register SM_FILE_T *fp;
47 int SM_NONVOLATILE timeout;
52 SM_REQUIRE_ISA(fp, SmFileMagic);
54 if ((fp->f_flags & (SMWR | SMRW)) == 0)
57 ** The file is not opened for writing, so it cannot be flushed
58 ** (writable means SMWR [write] or SMRW [read/write].
65 SM_CONVERT_TIME(fp, fd, timeout, &to);
67 /* Now do the flush */
68 return sm_flush(fp, (int *) &timeout);
72 ** SM_FLUSH -- perform the actual flush
74 ** Assumes that 'fp' has been validated before this function called.
77 ** fp -- file pointer to be flushed
78 ** timeout -- max time allowed for flush (milliseconds)
82 ** Failure: SM_IO_EOF and errno set
85 ** timeout will get updated with the time remaining (if any)
90 register SM_FILE_T *fp;
93 register unsigned char *p;
97 SM_REQUIRE_ISA(fp, SmFileMagic);
109 if ((p = fp->f_bf.smb_base) == NULL)
112 n = fp->f_p - p; /* write this much */
114 if ((fd = sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL)) == -1)
116 /* can't get an fd, likely internal 'fake' fp */
122 ** Set these immediately to avoid problems with longjmp and to allow
123 ** exchange buffering (via setvbuf) in user write function.
127 fp->f_w = t & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; /* implies SMFBF */
129 for (; n > 0; n -= t, p += t)
131 errno = 0; /* needed to ensure EOF correctly found */
133 /* Call the file type's write function */
134 t = (*fp->f_write)(fp, (char *)p, n);
137 if (t == 0 && errno == 0)
138 break; /* EOF found */
140 if (IS_IO_ERROR(fd, t, *timeout))
142 fp->f_flags |= SMERR;
144 /* errno set by fp->f_write */
147 SM_IO_WR_TIMEOUT(fp, fd, *timeout);