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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/libudev/libudev.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libudev/libudev.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/libudev/libudev.c b/src/libudev/libudev.c new file mode 100644 index 0000000..7357487 --- /dev/null +++ b/src/libudev/libudev.c @@ -0,0 +1,154 @@ +/* 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); +} |