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				+/* 
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				+ * 
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				+ * Copyright 2015, Google Inc. 
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				+ * All rights reserved. 
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				+ * 
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				+ * Redistribution and use in source and binary forms, with or without 
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				+ * modification, are permitted provided that the following conditions are 
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				+ * met: 
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				+ * 
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				+ *     * Redistributions of source code must retain the above copyright 
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				+ * notice, this list of conditions and the following disclaimer. 
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				+ *     * Redistributions in binary form must reproduce the above 
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				+ * copyright notice, this list of conditions and the following disclaimer 
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				+ * in the documentation and/or other materials provided with the 
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				+ * distribution. 
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				+ *     * Neither the name of Google Inc. nor the names of its 
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				+ * contributors may be used to endorse or promote products derived from 
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				+ * this software without specific prior written permission. 
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				+ * 
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				+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
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				+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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				+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
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				+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
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				+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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				+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
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				+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
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				+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
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				+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
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				+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
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				+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
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				+ * 
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				+ */ 
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				+ 
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				+#ifndef _POSIX_SOURCE 
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				+#define _POSIX_SOURCE 
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				+#endif 
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				+ 
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				+#include <unistd.h> 
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				+#include <assert.h> 
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				+#include <stdio.h> 
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				+#include <string.h> 
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				+#include <signal.h> 
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				+#include <stdlib.h> 
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				+#include <sys/types.h> 
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				+#include <sys/wait.h> 
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				+ 
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				+#include "src/core/iomgr/socket_utils_posix.h" 
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				+#include "src/core/support/string.h" 
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				+#include <grpc/support/alloc.h> 
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				+#include <grpc/support/host_port.h> 
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				+#include <grpc/support/log.h> 
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				+#include "test/core/util/port.h" 
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				+ 
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				+int test_client(const char *root, const char *host, int port) { 
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				+  int status; 
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				+  pid_t cli; 
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				+  cli = fork(); 
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				+  if (cli == 0) { 
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				+    char *binary_path; 
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				+    char *port_arg; 
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				+    gpr_asprintf(&binary_path, "%s/interop_client", root); 
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				+    gpr_asprintf(&port_arg, "--server_port=%d", port); 
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				+ 
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				+    execl(binary_path, binary_path, port_arg, NULL); 
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				+ 
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				+    gpr_free(binary_path); 
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				+    gpr_free(port_arg); 
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				+    return 1; 
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				+  } 
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				+  /* wait for client */ 
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				+  gpr_log(GPR_INFO, "Waiting for client: %s", host); 
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				+  if (waitpid(cli, &status, 0) == -1) return 2; 
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				+  if (!WIFEXITED(status)) return 4; 
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				+  if (WEXITSTATUS(status)) return WEXITSTATUS(status); 
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				+  return 0; 
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				+} 
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				+ 
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				+int main(int argc, char **argv) { 
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				+  char *me = argv[0]; 
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				+  char *lslash = strrchr(me, '/'); 
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				+  char root[1024]; 
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				+  int port = grpc_pick_unused_port_or_die(); 
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				+  int status; 
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				+  pid_t svr; 
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				+  int ret; 
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				+  int do_ipv6 = 1; 
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				+  /* seed rng with pid, so we don't end up with the same random numbers as a 
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				+     concurrently running test binary */ 
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				+  srand(getpid()); 
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				+  if (!grpc_ipv6_loopback_available()) { 
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				+    gpr_log(GPR_INFO, "Can't bind to ::1.  Skipping IPv6 tests."); 
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				+    do_ipv6 = 0; 
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				+  } 
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				+  /* figure out where we are */ 
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				+  if (lslash) { 
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				+    memcpy(root, me, lslash - me); 
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				+    root[lslash - me] = 0; 
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				+  } else { 
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				+    strcpy(root, "."); 
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				+  } 
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				+  /* start the server */ 
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				+  svr = fork(); 
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				+  if (svr == 0) { 
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				+    char *binary_path; 
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				+    char *port_arg; 
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				+    gpr_asprintf(&binary_path, "%s/interop_server", root); 
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				+    gpr_asprintf(&port_arg, "--port=%d", port); 
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				+ 
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				+    execl(binary_path, binary_path, port_arg, NULL); 
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				+ 
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				+    gpr_free(binary_path); 
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				+    gpr_free(port_arg); 
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				+    return 1; 
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				+  } 
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				+  /* wait a little */ 
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				+  sleep(2); 
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				+  /* start the clients */ 
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				+  ret = test_client(root, "127.0.0.1", port); 
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				+  if (ret != 0) return ret; 
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				+  ret = test_client(root, "::ffff:127.0.0.1", port); 
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				+  if (ret != 0) return ret; 
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				+  ret = test_client(root, "localhost", port); 
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				+  if (ret != 0) return ret; 
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				+  if (do_ipv6) { 
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				+    ret = test_client(root, "::1", port); 
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				+    if (ret != 0) return ret; 
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				+  } 
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				+  /* wait for server */ 
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				+  gpr_log(GPR_INFO, "Waiting for server"); 
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				+  kill(svr, SIGINT); 
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				+  if (waitpid(svr, &status, 0) == -1) return 2; 
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				+  if (!WIFEXITED(status)) return 4; 
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				+  if (WEXITSTATUS(status)) return WEXITSTATUS(status); 
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				+  return 0; 
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				+} 
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