Put thread-fork-init inside a run-once guard
[openssl.git] / crypto / threads_pthread.c
index 4ba4796..9644c25 100644 (file)
@@ -8,6 +8,7 @@
  */
 
 #include <openssl/crypto.h>
+#include "internal/cryptlib.h"
 
 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
 
@@ -28,20 +29,19 @@ CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
     }
 # else
     pthread_mutexattr_t attr;
-
     CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_mutex_t));
     if (lock == NULL)
         return NULL;
 
     pthread_mutexattr_init(&attr);
     pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-       
+
     if (pthread_mutex_init(lock, &attr) != 0) {
         pthread_mutexattr_destroy(&attr);
         OPENSSL_free(lock);
         return NULL;
     }
-       
+
     pthread_mutexattr_destroy(&attr);
 # endif
 
@@ -169,4 +169,22 @@ int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
     return 1;
 }
 
+# ifdef OPENSSL_SYS_UNIX
+static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT;
+
+static void fork_once_func(void)
+{
+    pthread_atfork(OPENSSL_fork_prepare,
+                   OPENSSL_fork_parent, OPENSSL_fork_child);
+}
+# endif
+
+int openssl_init_fork_handlers(void)
+{
+# ifdef OPENSSL_SYS_UNIX
+    if (pthread_once(&fork_once_control, fork_once_func) == 0)
+        return 1;
+# endif
+    return 0;
+}
 #endif