1 /* ========================================================================
2 * Copyright 1988-2006 University of Washington
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
11 * ========================================================================
15 * Program: Write data, treating partial writes as an error
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
23 * Internet: MRC@CAC.Washington.EDU
26 * Last Edited: 30 August 2006
29 /* The whole purpose of this unfortunate routine is to deal with DOS and
30 * certain cretinous versions of UNIX which decided that the "bytes actually
31 * written" return value from write() gave them license to use that for things
32 * that are really errors, such as disk quota exceeded, maximum file size
33 * exceeded, disk full, etc.
35 * BSD won't screw us this way on the local filesystem, but who knows what
36 * some NFS-mounted filesystem will do.
42 * Accepts: file descriptor
43 * I/O vector structure
44 * number of vectors in structure
45 * Returns: number of bytes written if successful, -1 if failure
48 long maxposint
= (long)((((unsigned long) 1) << ((sizeof(int) * 8) - 1)) - 1);
50 long safe_write (int fd
,char *buf
,long nbytes
)
53 if (nbytes
> 0) for (i
= nbytes
; i
; i
-= j
,buf
+= j
) {
54 while (((j
= write (fd
,buf
,(int) min (maxposint
,i
))) < 0) &&