OpenSSL integration: manage curl_global_init(...) used by modules

- http_client, http_async_client, xcap_client use libcurl
- call curl_global_init in a thread executor as it invokes
  OpenSSL functions on Debian 12
- clang-format

Cherry-pick from ac4f1be

src/core/rthreads.h

@@ -254,3 +254,41 @@ static int run_thread4P5I2P2(_thread_proto4P5I2P2 fn, void *arg1, void *arg2,
 #endif
 }
 #endif
+
+/*
+ * prototype: CURLcode curl_global_init(long flags) { ... }
+ */
+#ifdef KSR_RTHREAD_NEED_4L
+typedef int (*_thread_proto4L)(long);
+struct _thread_args4L
+{
+	_thread_proto4L fn;
+	long arg1;
+	int *ret;
+};
+static void *run_thread_wrap4L(struct _thread_args4L *args)
+{
+	*args->ret = (*args->fn)(args->arg1);
+	return NULL;
+}
+
+static int run_thread4L(_thread_proto4L fn, long arg1)
+{
+#ifdef USE_TLS
+	pthread_t tid;
+	int ret;
+
+	if(likely(ksr_tls_threads_mode == 0
+			   || (ksr_tls_threads_mode == 1 && process_no > 0))) {
+		return fn(arg1);
+	}
+	pthread_create(&tid, NULL, (_thread_proto)run_thread_wrap4L,
+			&(struct _thread_args4L){fn, arg1, &ret});
+	pthread_join(tid, NULL);
+
+	return ret;
+#else
+	return fn(arg1)
+#endif
+}
+#endif

src/modules/http_async_client/http_multi.c

@@ -32,6 +32,9 @@
 #include "../../core/mem/mem.h"
 #include "../../core/ut.h"
 #include "../../core/hashes.h"
+#define KSR_RTHREAD_NEED_4L
+#define KSR_RTHREAD_SKIP_P
+#include "../../core/rthreads.h"
 #include "http_multi.h"
 
 extern int hash_size;
@@ -389,7 +392,8 @@ void set_curl_mem_callbacks(void)
 			break;
 		case 1:
 			LM_DBG("Initilizing cURL with sys malloc\n");
-			rc = curl_global_init(CURL_GLOBAL_ALL);
+			rc = run_thread4L(
+					(_thread_proto4L)curl_global_init, CURL_GLOBAL_ALL);
 			if(rc != 0) {
 				LM_ERR("Cannot initialize cURL: %d\n", rc);
 			}

src/modules/http_client/http_client.c

@@ -64,6 +64,9 @@
 #include "../../core/lvalue.h"
 #include "../../core/pt.h" /* Process table */
 #include "../../core/kemi.h"
+#define KSR_RTHREAD_NEED_4L
+#define KSR_RTHREAD_SKIP_P
+#include "../../core/rthreads.h"
 
 #include "functions.h"
 #include "curlcon.h"
@@ -278,7 +281,7 @@ static int mod_init(void)
 	LM_DBG("init curl module\n");
 
 	/* Initialize curl */
-	if(curl_global_init(CURL_GLOBAL_ALL)) {
+	if(run_thread4L((_thread_proto4L)&curl_global_init, CURL_GLOBAL_ALL)) {
 		LM_ERR("curl_global_init failed\n");
 		return -1;
 	}

src/modules/xcap_client/xcap_client.c

@@ -41,6 +41,9 @@
 #include "../../core/mem/shm_mem.h"
 #include "../../core/rpc.h"
 #include "../../core/rpc_lookup.h"
+#define KSR_RTHREAD_NEED_4L
+#define KSR_RTHREAD_SKIP_P
+#include "../../core/rthreads.h"
 #include "../presence/utils_func.h"
 #include "xcap_functions.h"
 #include "xcap_client.h"
@@ -140,7 +143,7 @@ static int mod_init(void)
 	xcap_dbf.close(xcap_db);
 	xcap_db = NULL;
 
-	curl_global_init(CURL_GLOBAL_ALL);
+	run_thread4L((_thread_proto4L)curl_global_init, CURL_GLOBAL_ALL);
 
 	if(periodical_query) {
 		register_timer(query_xcap_update, 0, query_period);