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Diffstat (limited to 'src/libudev/src/libudev.c')
| -rw-r--r-- | src/libudev/src/libudev.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/src/libudev/src/libudev.c b/src/libudev/src/libudev.c new file mode 100644 index 0000000000..97d263ef3e --- /dev/null +++ b/src/libudev/src/libudev.c @@ -0,0 +1,254 @@ +/*** + This file is part of systemd. + + Copyright 2008-2014 Kay Sievers <kay@vrfy.org> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <ctype.h> +#include <stdarg.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <libudev.h> + +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/fd-util.h" +#include "systemd-basic/missing.h" +#include "systemd-basic/string-util.h" + +#include "libudev-private.h" + +/** + * SECTION:libudev + * @short_description: libudev context + * + * The context contains the default values read from the udev config file, + * and is passed to all library operations. + */ + +/** + * udev: + * + * Opaque object representing the library context. + */ +struct udev { + int refcount; + void (*log_fn)(struct udev *udev, + int priority, const char *file, int line, const char *fn, + const char *format, va_list args); + void *userdata; +}; + +/** + * udev_get_userdata: + * @udev: udev library context + * + * Retrieve stored data pointer from library context. This might be useful + * to access from callbacks. + * + * Returns: stored userdata + **/ +_public_ void *udev_get_userdata(struct udev *udev) { + if (udev == NULL) + return NULL; + return udev->userdata; +} + +/** + * udev_set_userdata: + * @udev: udev library context + * @userdata: data pointer + * + * Store custom @userdata in the library context. + **/ +_public_ void udev_set_userdata(struct udev *udev, void *userdata) { + if (udev == NULL) + return; + udev->userdata = userdata; +} + +/** + * udev_new: + * + * Create udev library context. This reads the udev configuration + * file, and fills in the default values. + * + * The initial refcount is 1, and needs to be decremented to + * release the resources of the udev library context. + * + * Returns: a new udev library context + **/ +_public_ struct udev *udev_new(void) { + struct udev *udev; + _cleanup_fclose_ FILE *f = NULL; + + udev = new0(struct udev, 1); + if (udev == NULL) + return NULL; + udev->refcount = 1; + + f = fopen("/etc/udev/udev.conf", "re"); + if (f != NULL) { + char line[UTIL_LINE_SIZE]; + unsigned line_nr = 0; + + while (fgets(line, sizeof(line), f)) { + size_t len; + char *key; + char *val; + + line_nr++; + + /* find key */ + key = line; + while (isspace(key[0])) + key++; + + /* comment or empty line */ + if (key[0] == '#' || key[0] == '\0') + continue; + + /* split key/value */ + val = strchr(key, '='); + if (val == NULL) { + log_debug("/etc/udev/udev.conf:%u: missing assignment, skipping line.", line_nr); + continue; + } + val[0] = '\0'; + val++; + + /* find value */ + while (isspace(val[0])) + val++; + + /* terminate key */ + len = strlen(key); + if (len == 0) + continue; + while (isspace(key[len-1])) + len--; + key[len] = '\0'; + + /* terminate value */ + len = strlen(val); + if (len == 0) + continue; + while (isspace(val[len-1])) + len--; + val[len] = '\0'; + + if (len == 0) + continue; + + /* unquote */ + if (val[0] == '"' || val[0] == '\'') { + if (val[len-1] != val[0]) { + log_debug("/etc/udev/udev.conf:%u: inconsistent quoting, skipping line.", line_nr); + continue; + } + val[len-1] = '\0'; + val++; + } + + if (streq(key, "udev_log")) { + int prio; + + prio = util_log_priority(val); + if (prio < 0) + log_debug("/etc/udev/udev.conf:%u: invalid log level '%s', ignoring.", line_nr, val); + else + log_set_max_level(prio); + continue; + } + } + } + + return udev; +} + +/** + * udev_ref: + * @udev: udev library context + * + * Take a reference of the udev library context. + * + * Returns: the passed udev library context + **/ +_public_ struct udev *udev_ref(struct udev *udev) { + if (udev == NULL) + return NULL; + udev->refcount++; + return udev; +} + +/** + * udev_unref: + * @udev: udev library context + * + * Drop a reference of the udev library context. If the refcount + * reaches zero, the resources of the context will be released. + * + * Returns: the passed udev library context if it has still an active reference, or #NULL otherwise. + **/ +_public_ struct udev *udev_unref(struct udev *udev) { + if (udev == NULL) + return NULL; + udev->refcount--; + if (udev->refcount > 0) + return udev; + free(udev); + return NULL; +} + +/** + * udev_set_log_fn: + * @udev: udev library context + * @log_fn: function to be called for log messages + * + * This function is deprecated. + * + **/ +_public_ void udev_set_log_fn(struct udev *udev, + void (*log_fn)(struct udev *udev, + int priority, const char *file, int line, const char *fn, + const char *format, va_list args)) { + return; +} + +/** + * udev_get_log_priority: + * @udev: udev library context + * + * This function is deprecated. + * + **/ +_public_ int udev_get_log_priority(struct udev *udev) { + return log_get_max_level(); +} + +/** + * udev_set_log_priority: + * @udev: udev library context + * @priority: the new log priority + * + * This function is deprecated. + * + **/ +_public_ void udev_set_log_priority(struct udev *udev, int priority) { + log_set_max_level(priority); +} |