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Dogcows Code - chaz/tar/blob - lib/full-write.c
1 /* An interface to read and write that retries (if necessary) until complete.
3 Copyright (C) 1993, 1994, 1997-2003 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 # include "full-read.h"
27 # include "full-write.h"
36 # include "safe-read.h"
37 # define safe_rw safe_read
38 # define full_rw full_read
40 # define const /* empty */
42 # include "safe-write.h"
43 # define safe_rw safe_write
44 # define full_rw full_write
48 /* Set errno to zero upon EOF. */
49 # define ZERO_BYTE_TRANSFER_ERRNO 0
51 /* Some buggy drivers return 0 when one tries to write beyond
52 a device's end. (Example: Linux 1.2.13 on /dev/fd0.)
53 Set errno to ENOSPC so they get a sensible diagnostic. */
54 # define ZERO_BYTE_TRANSFER_ERRNO ENOSPC
57 /* Write(read) COUNT bytes at BUF to(from) descriptor FD, retrying if
58 interrupted or if a partial write(read) occurs. Return the number
60 When writing, set errno if fewer than COUNT bytes are written.
61 When reading, if fewer than COUNT bytes are read, you must examine
62 errno to distinguish failure from EOF (errno == 0). */
64 full_rw (int fd
, const void *buf
, size_t count
)
67 const char *ptr
= buf
;
71 size_t n_rw
= safe_rw (fd
, ptr
, count
);
72 if (n_rw
== (size_t) -1)
76 errno
= ZERO_BYTE_TRANSFER_ERRNO
;
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