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udevadm: make use of the new uuid-enabled triggering for "udevadm trigger"

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This adds two things:

- A new switch --uuid is added to "udevadm trigger". If specified a
  random UUID is associated with the synthettic uevent and it is printed
  to stdout. It may then be used manually to match up uevents as they
  propagate through the system.

- The UUID logic is now implicitly enabled if "udevadm trigger --settle"
  is used, in order to wait for precisely the uevents we actually
  trigger. Fallback support is kept for pre-4.13 kernels (where the
  requests for trigger uevents with uuids results in EINVAL).
This commit is contained in:
Lennart Poettering
2021-05-26 21:44:36 +02:00
parent b485fd932a
commit 730b9c1e14
4 changed files with 108 additions and 23 deletions
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src/basic/hash-funcs.h
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@@ -82,6 +82,7 @@ extern const struct hash_ops string_hash_ops_free_free;
void path_hash_func(const char *p, struct siphash *state);
extern const struct hash_ops path_hash_ops;
extern const struct hash_ops path_hash_ops_free;
extern const struct hash_ops path_hash_ops_free_free;
/* This will compare the passed pointers directly, and will not dereference them. This is hence not useful for strings
* or suchlike. */