Update to NSS 3.15.5 and NSPR 4.10.3.

nspr/pr/src/pthreads/ptio.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /*
 ** File:   ptio.c
 ** Descritpion:  Implemenation of I/O methods for pthreads
 */
 
@@ skipping 3382 matching lines @@
     PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
     return fd;
 }  /* PR_AllocFileDesc */
 
 #if !defined(_PR_INET6) || defined(_PR_INET6_PROBE)
 PR_EXTERN(PRStatus) _pr_push_ipv6toipv4_layer(PRFileDesc *fd);
 #if defined(_PR_INET6_PROBE)
 extern PRBool _pr_ipv6_is_present(void);
 PR_IMPLEMENT(PRBool) _pr_test_ipv6_socket()
 {
-PRInt32 osfd;
-
 #if defined(DARWIN)
     /*
      * Disable IPv6 if Darwin version is less than 7.0.0 (OS X 10.3).  IPv6 on
      * lesser versions is not ready for general use (see bug 222031).
      */
     {
         struct utsname u;
         if (uname(&u) != 0 || atoi(u.release) < 7)
             return PR_FALSE;
     }
 #endif
 
+#if defined(LINUX)
+    /* If /proc/net/if_inet6 exists, the Linux kernel supports IPv6. */
+    int rv = access("/proc/net/if_inet6", F_OK);
+    return (rv == 0);
+#else
     /*
      * HP-UX only: HP-UX IPv6 Porting Guide (dated February 2001)
      * suggests that we call open("/dev/ip6", O_RDWR) to determine
      * whether IPv6 APIs and the IPv6 stack are on the system.
      * Our portable test below seems to work fine, so I am using it.
      */
-    osfd = socket(AF_INET6, SOCK_STREAM, 0);
+    PRInt32 osfd = socket(AF_INET6, SOCK_STREAM, 0);
     if (osfd != -1) {
         close(osfd);
         return PR_TRUE;
     }
     return PR_FALSE;
+#endif
 }
 #endif  /* _PR_INET6_PROBE */
 #endif
 
 PR_IMPLEMENT(PRFileDesc*) PR_Socket(PRInt32 domain, PRInt32 type, PRInt32 proto)
 {
     PRIntn osfd;
     PRDescType ftype;
     PRFileDesc *fd = NULL;
 #if defined(_PR_INET6_PROBE) || !defined(_PR_INET6)
@@ skipping 1562 matching lines @@
 
 PR_IMPLEMENT(PRStatus) PR_GetFileInfo64UTF16(const PRUnichar *fn, PRFileInfo64 *info)
 {
     PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
     return PR_FAILURE;
 }
 /* ================ UTF16 Interfaces ================================ */
 #endif /* MOZ_UNICODE */
 
 /* ptio.c */