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write.c
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C/C++ Source or Header
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1995-06-28
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3KB
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77 lines
/*
* Program: Write data, treating partial writes as an error
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 26 May 1995
* Last Edited: 28 June 1995
*
* Copyright 1995 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* The whole purpose of this unfortunate routine is to deal with DOS and
* certain cretinous versions of UNIX which decided that the "bytes actually
* written" return value from write() and writev() gave them license to use
* that for things that are really errors, such as disk quota exceeded,
* maximum file size exceeded, disk full, etc.
*
* BSD won't screw us this way on the local filesystem, but who knows what
* some NFS-mounted filesystem will do.
*/
#undef write
/* Write data to file
* Accepts: file descriptor
* I/O vector structure
* number of vectors in structure
* Returns: number of bytes written if successful, -1 if failure
*/
long maxposint = (long)((((unsigned long) 1) << ((sizeof(int) * 8) - 1)) - 1);
long safe_write (fd,buf,nbytes)
int fd;
char *buf;
long nbytes;
{
long i;
if (nbytes < 0) return -1; /* barf negative requests */
while ((nbytes > maxposint)) {/* split large request into multiple parts */
if (!write (fd,buf,maxposint)) return NIL;
buf += maxposint; /* account for this many bytes */
nbytes -= maxposint;
}
/* do the output */
if ((i = (long) write (fd,buf,(int) nbytes)) >= 0) {
/* some data written, right size? */
if (i == nbytes) return nbytes;
errno = EFBIG; /* gack!! fake an error code */
}
return -1; /* error */
}