From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 20 Apr 2021 14:01:53 +0000 (+0200)
Subject: sd-device: add API to query from when a udev database entry is
X-Git-Tag: v249-rc1~380^2~3
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8626b43be42b9db065f8fdf2b057990ef511150e;p=thirdparty%2Fsystemd.git

sd-device: add API to query from when a udev database entry is

We already store a CLOCK_MONOTONIC timestamp for each device appearance,
let' make this queriable.

This is useful to determine whether a udev device database entry is from
a current appearance of the device or a previous one, by comparing it
with appropriately taken timestamps.
---

diff --git a/src/libsystemd/libsystemd.sym b/src/libsystemd/libsystemd.sym
index b025b550267..996bf25d6c2 100644
--- a/src/libsystemd/libsystemd.sym
+++ b/src/libsystemd/libsystemd.sym
@@ -756,4 +756,5 @@ LIBSYSTEMD_249 {
 global:
         sd_device_monitor_filter_add_match_sysattr;
         sd_device_monitor_filter_add_match_parent;
+        sd_device_get_usec_initialized;
 } LIBSYSTEMD_248;
diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index 200e2077ee6..4b7f22e2076 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -1428,6 +1428,27 @@ _public_ int sd_device_get_is_initialized(sd_device *device) {
         return device->is_initialized;
 }
 
+_public_ int sd_device_get_usec_initialized(sd_device *device, uint64_t *ret) {
+        int r;
+
+        assert_return(device, -EINVAL);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        if (!device->is_initialized)
+                return -EBUSY;
+
+        if (device->usec_initialized == 0)
+                return -ENODATA;
+
+        if (ret)
+                *ret = device->usec_initialized;
+
+        return 0;
+}
+
 _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) {
         usec_t now_ts;
         int r;
diff --git a/src/systemd/sd-device.h b/src/systemd/sd-device.h
index e760e03f35a..8b7b361295e 100644
--- a/src/systemd/sd-device.h
+++ b/src/systemd/sd-device.h
@@ -79,6 +79,7 @@ int sd_device_get_action(sd_device *device, sd_device_action_t *ret);
 int sd_device_get_seqnum(sd_device *device, uint64_t *ret);
 
 int sd_device_get_is_initialized(sd_device *device);
+int sd_device_get_usec_initialized(sd_device *device, uint64_t *usec);
 int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec);
 
 const char *sd_device_get_tag_first(sd_device *device);