[Rpm-maint] [rpm-software-management/rpm] Add rpmlogOnce() and rpmlogReset() (PR #3417)

[Panu Matilainen]

@pmatilai commented on this pull request.



> @@ -412,3 +415,43 @@ void rpmlog (int code, const char *fmt, ...)
 exit:
     errno = saved_errno;
 }
+
+int rpmlogOnce (uint64_t domain, const char * key, int code, const char *fmt, ...)
+{
+    int saved_errno = errno;
+    rpmlogCtx ctx = rpmlogCtxAcquire();
+    int newkey = 0;
+
+    if (ctx) {
+	wrlock lock(ctx->mutex);
+	newkey = !ctx->seen[domain][{code, key}]++;

"This" is unclear :sweat_smile: Maybe something to the tune of "[] access on map creates the element on first access", but the more you think about it the more the comment starts seeming redundant :sweat_smile: 
So dunno - up to you.

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