diff options
Diffstat (limited to 'udev_config.c')
| -rw-r--r-- | udev_config.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/udev_config.c b/udev_config.c new file mode 100644 index 0000000000..262108dff7 --- /dev/null +++ b/udev_config.c @@ -0,0 +1,195 @@ +/* + * udev_config.c + * + * Userspace devfs + * + * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> + * + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +/* define this to enable parsing debugging */ +/* #define DEBUG_PARSER */ + +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <ctype.h> + +#include "udev.h" +#include "udev_version.h" +#include "namedev.h" +#include "libsysfs/libsysfs.h" + +/* global variables */ +char sysfs_path[SYSFS_PATH_MAX]; +char udev_config_dir[PATH_MAX]; +char udev_root[PATH_MAX]; +char udev_db_filename[PATH_MAX+NAME_MAX]; +char udev_permission_filename[PATH_MAX+NAME_MAX]; +char udev_rules_filename[PATH_MAX+NAME_MAX]; +char udev_config_filename[PATH_MAX+NAME_MAX]; +char default_mode_str[NAME_MAX]; + + +static void init_variables(void) +{ + strfieldcpy(udev_root, UDEV_ROOT); + strfieldcpy(udev_config_dir, UDEV_CONFIG_DIR); +} + +#define set_var(_name, _var) \ + if (strcasecmp(variable, _name) == 0) { \ + dbg_parse("%s = '%s'", _name, value); \ + strncpy(_var, value, sizeof(_var)); \ + } + +static int parse_config_file(void) +{ + char line[255]; + char *temp; + char *variable; + char *value; + FILE *fd; + int lineno = 0; + int retval = 0; + + fd = fopen(udev_config_filename, "r"); + if (fd != NULL) { + dbg("reading '%s' as config file", udev_config_filename); + } else { + dbg("can't open '%s' as config file", udev_config_filename); + return -ENODEV; + } + + /* loop through the whole file */ + while (1) { + /* get a line */ + temp = fgets(line, sizeof(line), fd); + if (temp == NULL) + goto exit; + lineno++; + + dbg_parse("read '%s'", temp); + + /* eat the whitespace at the beginning of the line */ + while (isspace(*temp)) + ++temp; + + /* empty line? */ + if (*temp == 0x00) + continue; + + /* see if this is a comment */ + if (*temp == COMMENT_CHARACTER) + continue; + + retval = get_pair(&temp, &variable, &value); + if (retval) + break; + + dbg_parse("variable = '%s', value = '%s'", variable, value); + + set_var("udev_root", udev_root); + set_var("udev_db", udev_db_filename); + set_var("udev_rules", udev_rules_filename); + set_var("udev_permissions", udev_permission_filename); + set_var("default_mode", default_mode_str); + } + dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename, + lineno, temp - line, temp); +exit: + fclose(fd); + return retval; +} + +static void get_dirs(void) +{ + char *temp; + char *udev_db = UDEV_DB; + char *udev_config = UDEV_CONFIG_FILE; + char *udev_rules = UDEV_RULES_FILE; + char *udev_permission = UDEV_PERMISSION_FILE; + int retval; + + retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); + if (retval) + dbg("sysfs_get_mnt_path failed"); + + /* see if we should try to override any of the default values */ + temp = getenv("UDEV_TEST"); + if (temp != NULL) { + /* hm testing is happening, use the specified values, if they are present */ + temp = getenv("SYSFS_PATH"); + if (temp) + strfieldcpy(sysfs_path, temp); + temp = getenv("UDEV_CONFIG_DIR"); + if (temp) + strfieldcpy(udev_config_dir, temp); + temp = getenv("UDEV_ROOT"); + if (temp) + strfieldcpy(udev_root, temp); + temp = getenv("UDEV_DB"); + if (temp) + udev_db = temp; + temp = getenv("UDEV_CONFIG_FILE"); + if (temp) + udev_config = temp; + temp = getenv("UDEV_RULES_FILE"); + if (temp) + udev_rules = temp; + temp = getenv("UDEV_PERMISSION_FILE"); + if (temp) + udev_permission = temp; + } + dbg("sysfs_path='%s'", sysfs_path); + + strncpy(udev_db_filename, udev_root, sizeof(udev_db_filename)); + strncat(udev_db_filename, udev_db, sizeof(udev_db_filename)); + + strncpy(udev_config_filename, udev_config_dir, sizeof(udev_config_filename)); + strncat(udev_config_filename, udev_config, sizeof(udev_config_filename)); + + strncpy(udev_rules_filename, udev_config_dir, sizeof(udev_permission_filename)); + strncat(udev_rules_filename, udev_rules, sizeof(udev_permission_filename)); + + strncpy(udev_permission_filename, udev_config_dir, sizeof(udev_permission_filename)); + strncat(udev_permission_filename, udev_permission, sizeof(udev_permission_filename)); + + dbg_parse("udev_root = %s", udev_root); + dbg_parse("udev_config_filename = %s", udev_config_filename); + dbg_parse("udev_db_filename = %s", udev_db_filename); + dbg_parse("udev_rules_filename = %s", udev_rules_filename); + dbg_parse("udev_permission_filename = %s", udev_permission_filename); + parse_config_file(); + + dbg_parse("udev_root = %s", udev_root); + dbg_parse("udev_config_filename = %s", udev_config_filename); + dbg_parse("udev_db_filename = %s", udev_db_filename); + dbg_parse("udev_rules_filename = %s", udev_rules_filename); + dbg_parse("udev_permission_filename = %s", udev_permission_filename); +} + +void udev_init_config(void) +{ + init_variables(); + get_dirs(); +} + + |