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5fbef188 | 1 | /* Get a host configuration item kept as the whole contents of a file. |
c84142e8 UD |
2 | Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. | |
5fbef188 | 4 | |
c84142e8 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
5fbef188 | 9 | |
c84142e8 UD |
10 | The GNU C Library 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 GNU | |
13 | Library General Public License for more details. | |
5fbef188 | 14 | |
c84142e8 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
5fbef188 | 19 | |
a5d96b25 | 20 | #include <fcntl.h> |
5fbef188 RM |
21 | #include <hurd.h> |
22 | #include "hurdhost.h" | |
23 | ||
24 | ssize_t | |
25 | _hurd_get_host_config (const char *item, char *buf, size_t buflen) | |
26 | { | |
27 | error_t err; | |
28 | char *data; | |
29 | mach_msg_type_number_t nread, more; | |
30 | file_t config = __file_name_lookup (item, O_RDONLY, 0); | |
31 | if (config == MACH_PORT_NULL) | |
32 | return -1; | |
33 | ||
34 | data = buf; | |
35 | err = __io_read (config, &data, &nread, -1, buflen); | |
36 | if (! err) | |
37 | /* Check if there is more in the file we didn't read. */ | |
38 | err = __io_readable (config, &more); | |
39 | __mach_port_deallocate (__mach_task_self (), config); | |
40 | if (err) | |
41 | return __hurd_fail (err); | |
42 | if (data != buf) | |
43 | { | |
44 | memcpy (buf, data, nread); | |
45 | __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); | |
46 | } | |
47 | ||
48 | /* Remove newlines in case someone wrote the file by hand. */ | |
49 | while (buf[nread - 1] == '\n') | |
50 | buf[--nread] = '\0'; | |
51 | ||
52 | if (more) | |
53 | /* If we didn't read the whole file, tell the caller to use a bigger | |
54 | buffer next time. */ | |
55 | return __hurd_fail (ENAMETOOLONG); | |
56 | ||
57 | return nread; | |
58 | } |