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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <ctype.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include "libudev.h"
#include "alloc-util.h"
#include "fd-util.h"
#include "string-util.h"
/**
* SECTION:libudev
* @short_description: libudev context
*/
/**
* udev:
*
* Opaque object representing the library context.
*/
struct udev {
unsigned n_ref;
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) {
assert_return(udev, 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)
return;
udev->userdata = userdata;
}
/**
* udev_new:
*
* Create udev library context. This only allocates the basic data structure.
*
* 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;
udev = new(struct udev, 1);
if (!udev)
return_with_errno(NULL, ENOMEM);
*udev = (struct udev) {
.n_ref = 1,
};
return udev;
}
/**
* udev_ref:
* @udev: udev library context
*
* Take a reference of the udev library context.
*
* Returns: the passed udev library context
**/
DEFINE_PUBLIC_TRIVIAL_REF_FUNC(struct udev, 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)
return NULL;
assert(udev->n_ref > 0);
udev->n_ref--;
if (udev->n_ref > 0)
/* This is different from our convention, but let's keep backward
* compatibility. So, do not use DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC()
* macro to define this function. */
return udev;
return mfree(udev);
}
/**
* 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);
}
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