Fixes from review

Author: embhorn

src/crl.c

@@ -1716,7 +1716,11 @@ static THREAD_RETURN WOLFSSL_THREAD DoMonitor(void* arg)
         return NULL;
     }
 #ifdef FD_CLOEXEC
-    (void)fcntl(crl->mfd, F_SETFD, FD_CLOEXEC);
+    {
+        int fdFlags = fcntl(crl->mfd, F_GETFD);
+        if (fdFlags >= 0)
+            (void)fcntl(crl->mfd, F_SETFD, fdFlags | FD_CLOEXEC);
+    }
 #endif
 
     /* listen for custom shutdown event */

src/wolfio.c

@@ -1640,7 +1640,7 @@ int wolfIO_TcpAccept(SOCKET_T sockfd, SOCKADDR* peer_addr, XSOCKLENT* peer_len)
 {
     int fd;
 #if !defined(USE_WINDOWS_API) && !defined(WOLFSSL_ZEPHYR) && \
-    defined(SOCK_CLOEXEC) && (defined(__linux__) || defined(__ANDROID__))
+    (defined(__linux__) || defined(__ANDROID__))
     fd = (int)accept4(sockfd, peer_addr, peer_len, SOCK_CLOEXEC);
 #else
     fd = (int)accept(sockfd, peer_addr, peer_len);

wolfcrypt/src/port/af_alg/afalg_hash.c

@@ -19,6 +19,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
  */
 
+#if defined(__linux__) && !defined(_GNU_SOURCE)
+    #define _GNU_SOURCE 1
+#endif
+
 #include <wolfssl/wolfcrypt/libwolfssl_sources.h>
 
 #if defined(WOLFSSL_AFALG_HASH) || (defined(WOLFSSL_AFALG_XILINX_SHA3) \

wolfcrypt/src/port/af_alg/wc_afalg.c

@@ -19,6 +19,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
  */
 
+#if defined(__linux__) && !defined(_GNU_SOURCE)
+    #define _GNU_SOURCE 1
+#endif
+
 #include <wolfssl/wolfcrypt/libwolfssl_sources.h>
 
 #if defined(WOLFSSL_AFALG) || defined(WOLFSSL_AFALG_XILINX)
@@ -61,7 +65,7 @@ int wc_Afalg_Accept(struct sockaddr_alg* in, int inSz, int sock)
         return WC_AFALG_SOCK_E;
     }
 
-#if defined(__linux__) && defined(SOCK_CLOEXEC)
+#if defined(__linux__)
     return accept4(sock, NULL, NULL, SOCK_CLOEXEC);
 #else
     return accept(sock, NULL, NULL);