chiark / gitweb /
[PATCH] sync klibc with release 0.95
[elogind.git] / udev_config.c
1 /*
2  * udev_config.c
3  *
4  * Userspace devfs
5  *
6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
7  *
8  *
9  *      This program is free software; you can redistribute it and/or modify it
10  *      under the terms of the GNU General Public License as published by the
11  *      Free Software Foundation version 2 of the License.
12  * 
13  *      This program is distributed in the hope that it will be useful, but
14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *      General Public License for more details.
17  * 
18  *      You should have received a copy of the GNU General Public License along
19  *      with this program; if not, write to the Free Software Foundation, Inc.,
20  *      675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  */
23
24 /* define this to enable parsing debugging */
25 /* #define DEBUG_PARSER */
26
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdio.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <ctype.h>
34
35 #include "udev.h"
36 #include "udev_version.h"
37 #include "namedev.h"
38 #include "libsysfs/libsysfs.h"
39
40 /* global variables */
41 char sysfs_path[SYSFS_PATH_MAX];
42 char udev_root[PATH_MAX];
43 char udev_db_filename[PATH_MAX+NAME_MAX];
44 char udev_permissions_filename[PATH_MAX+NAME_MAX];
45 char udev_rules_filename[PATH_MAX+NAME_MAX];
46 char udev_config_filename[PATH_MAX+NAME_MAX];
47 char default_mode_str[NAME_MAX];
48
49
50 static void init_variables(void)
51 {
52         /* fill up the defaults.  
53          * If any config values are specified, they will
54          * override these values. */
55         strfieldcpy(udev_root, UDEV_ROOT);
56         strfieldcpy(udev_db_filename, UDEV_DB);
57         strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE);
58         strfieldcpy(udev_rules_filename, UDEV_RULES_FILE);
59         strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE);
60 }
61
62 #define set_var(_name, _var)                            \
63         if (strcasecmp(variable, _name) == 0) {         \
64                 dbg_parse("%s = '%s'", _name, value);   \
65                 strncpy(_var, value, sizeof(_var));     \
66         }
67
68 static int parse_config_file(void)
69 {
70         char line[255];
71         char *temp;
72         char *variable;
73         char *value;
74         FILE *fd;
75         int lineno = 0;
76         int retval = 0;
77         
78         fd = fopen(udev_config_filename, "r");
79         if (fd != NULL) {
80                 dbg("reading '%s' as config file", udev_config_filename);
81         } else {
82                 dbg("can't open '%s' as config file", udev_config_filename);
83                 return -ENODEV;
84         }
85
86         /* loop through the whole file */
87         while (1) {
88                 /* get a line */
89                 temp = fgets(line, sizeof(line), fd);
90                 if (temp == NULL)
91                         goto exit;
92                 lineno++;
93
94                 dbg_parse("read '%s'", temp);
95
96                 /* eat the whitespace at the beginning of the line */
97                 while (isspace(*temp))
98                         ++temp;
99
100                 /* empty line? */
101                 if (*temp == 0x00)
102                         continue;
103
104                 /* see if this is a comment */
105                 if (*temp == COMMENT_CHARACTER)
106                         continue;
107
108                 retval = get_pair(&temp, &variable, &value);
109                 if (retval)
110                         break;
111                 
112                 dbg_parse("variable = '%s', value = '%s'", variable, value);
113
114                 set_var("udev_root", udev_root);
115                 set_var("udev_db", udev_db_filename);
116                 set_var("udev_rules", udev_rules_filename);
117                 set_var("udev_permissions", udev_permissions_filename);
118                 set_var("default_mode", default_mode_str);
119         }
120         dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
121                   lineno, temp - line, temp);
122 exit:
123         fclose(fd);
124         return retval;
125 }
126
127 static void get_dirs(void)
128 {
129         char *temp;
130         int retval;
131
132         retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
133         if (retval)
134                 dbg("sysfs_get_mnt_path failed");
135
136         /* see if we should try to override any of the default values */
137         temp = getenv("UDEV_TEST");
138         if (temp != NULL) {
139                 /* hm testing is happening, use the specified values, if they are present */
140                 temp = getenv("SYSFS_PATH");
141                 if (temp)
142                         strfieldcpy(sysfs_path, temp);
143                 temp = getenv("UDEV_CONFIG_FILE");
144                 if (temp)
145                         strfieldcpy(udev_config_filename, temp);
146         }
147         dbg("sysfs_path='%s'", sysfs_path);
148
149         dbg_parse("udev_root = %s", udev_root);
150         dbg_parse("udev_config_filename = %s", udev_config_filename);
151         dbg_parse("udev_db_filename = %s", udev_db_filename);
152         dbg_parse("udev_rules_filename = %s", udev_rules_filename);
153         dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
154         parse_config_file();
155
156         dbg_parse("udev_root = %s", udev_root);
157         dbg_parse("udev_config_filename = %s", udev_config_filename);
158         dbg_parse("udev_db_filename = %s", udev_db_filename);
159         dbg_parse("udev_rules_filename = %s", udev_rules_filename);
160         dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
161 }
162
163 void udev_init_config(void)
164 {
165         init_variables();
166         get_dirs();
167 }
168
169