Mercurial > hgrepos > hgweb.cgi > imapext
comparison src/osdep/unix/write.c @ 0:ada5e610ab86
imap-2007e
author | yuuji@gentei.org |
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date | Mon, 14 Sep 2009 15:17:45 +0900 |
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1 /* ======================================================================== | |
2 * Copyright 1988-2006 University of Washington | |
3 * | |
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 | |
7 * | |
8 * http://www.apache.org/licenses/LICENSE-2.0 | |
9 * | |
10 * | |
11 * ======================================================================== | |
12 */ | |
13 | |
14 /* | |
15 * Program: Write data, treating partial writes as an error | |
16 * | |
17 * Author: Mark Crispin | |
18 * Networks and Distributed Computing | |
19 * Computing & Communications | |
20 * University of Washington | |
21 * Administration Building, AG-44 | |
22 * Seattle, WA 98195 | |
23 * Internet: MRC@CAC.Washington.EDU | |
24 * | |
25 * Date: 26 May 1995 | |
26 * Last Edited: 30 August 2006 | |
27 */ | |
28 | |
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. | |
34 * | |
35 * BSD won't screw us this way on the local filesystem, but who knows what | |
36 * some NFS-mounted filesystem will do. | |
37 */ | |
38 | |
39 #undef write | |
40 | |
41 /* Write data to file | |
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 | |
46 */ | |
47 | |
48 long maxposint = (long)((((unsigned long) 1) << ((sizeof(int) * 8) - 1)) - 1); | |
49 | |
50 long safe_write (int fd,char *buf,long nbytes) | |
51 { | |
52 long i,j; | |
53 if (nbytes > 0) for (i = nbytes; i; i -= j,buf += j) { | |
54 while (((j = write (fd,buf,(int) min (maxposint,i))) < 0) && | |
55 (errno == EINTR)); | |
56 if (j < 0) return j; | |
57 } | |
58 return nbytes; | |
59 } |