home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Skunkware 98
/
Skunkware 98.iso
/
src
/
mail
/
pine3.96.tar.gz
/
pine3.96.tar
/
pine3.96
/
imap
/
non-ANSI
/
c-client
/
writev.c
< prev
next >
Wrap
Text File
|
1995-07-07
|
3KB
|
73 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: 7 July 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 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 writev
/* Write data vector to file
* Accepts: file descriptor
* I/O vector structure
* number of vectors in structure
* Returns: T if successful, NIL if failure
*/
long safe_writev (fd,iov,iovcnt)
int fd;
struct iovec *iov;
int iovcnt;
{
long i = 0;
long nbytes = 0;
struct iovec *iv = iov;
if (iovcnt <= 0) return -1;
while (i++ < iovcnt) nbytes += (iv++)->iov_len;
/* do the output */
if ((i = (long) writev (fd,iov,iovcnt)) >= 0) {
/* some data written, right size? */
if (i == nbytes) return nbytes;
errno = EFBIG; /* gack!! fake an error code */
}
return -1; /* error */
}