call getpid() once at child init and save in the SSLModConfigRec

to avoid getpid() calls at request time
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92231 13f79535-47bb-0310-9956-ffa450edef68

modules/ssl/mod_ssl.h

@@ -465,6 +465,7 @@ typedef struct {
 #define SSLConnLogApplies(sslconn, level) (sslconn->log_level >= level)
 
 typedef struct {
+    pid_t           pid;
     apr_pool_t     *pPool;
     BOOL            bFixed;
     int             nInitCount;

modules/ssl/ssl_engine_init.c

@@ -964,6 +964,9 @@ STACK_OF(X509_NAME) *ssl_init_FindCAList(server_rec *s, apr_pool_t *pp, const ch
 
 void ssl_init_Child(apr_pool_t *p, server_rec *s)
 {
+    SSLModConfigRec *mc = myModConfig(s);
+    mc->pid = getpid(); /* only call getpid() once per-process */
+
      /* open the mutex lockfile */
      ssl_mutex_reinit(s, p);
      return;

modules/ssl/ssl_engine_rand.c

@@ -136,7 +136,7 @@ int ssl_rand_seed(server_rec *s, apr_pool_t *p, ssl_rsctx_t nCtx, char *prefix)
                 /*
                  * seed in the current process id (usually just 4 bytes)
                  */
-                pid = getpid();
+                pid = mc->pid;
                 l = sizeof(pid_t);
                 RAND_seed((unsigned char *)&pid, l);
                 nDone += l;