src/core/lib/iomgr/tcp_client_posix.c - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "src/core/lib/iomgr/port.h"

 #ifdef GPR_POSIX_SOCKET

 #include "src/core/lib/iomgr/tcp_client.h"

 #include <errno.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <unistd.h>

 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/time.h>

 #include "src/core/lib/iomgr/ev_posix.h"
 #include "src/core/lib/iomgr/iomgr_posix.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
 #include "src/core/lib/iomgr/socket_utils_posix.h"
 #include "src/core/lib/iomgr/tcp_posix.h"
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/iomgr/unix_sockets_posix.h"
 #include "src/core/lib/support/string.h"

 extern int grpc_tcp_trace;

 typedef struct {
   gpr_mu mu;
   grpc_fd *fd;
   gpr_timespec deadline;
   grpc_timer alarm;
   int refs;
   grpc_closure write_closure;
   grpc_pollset_set *interested_parties;
   char *addr_str;
   grpc_endpoint **ep;
   grpc_closure *closure;
 } async_connect;

 static grpc_error *prepare_socket(const struct sockaddr *addr, int fd) {
   grpc_error *err = GRPC_ERROR_NONE;

   GPR_ASSERT(fd >= 0);

   err = grpc_set_socket_nonblocking(fd, 1);
   if (err != GRPC_ERROR_NONE) goto error;
   err = grpc_set_socket_cloexec(fd, 1);
   if (err != GRPC_ERROR_NONE) goto error;
   if (!grpc_is_unix_socket(addr)) {
     err = grpc_set_socket_low_latency(fd, 1);
     if (err != GRPC_ERROR_NONE) goto error;
   }
   err = grpc_set_socket_no_sigpipe_if_possible(fd);
   if (err != GRPC_ERROR_NONE) goto error;
   goto done;

 error:
   if (fd >= 0) {
     close(fd);
   }
 done:
   return err;
 }

 static void tc_on_alarm(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) {
   int done;
   async_connect *ac = acp;
   if (grpc_tcp_trace) {
     const char *str = grpc_error_string(error);
     gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: error=%s", ac->addr_str,
             str);
     grpc_error_free_string(str);
   }
   gpr_mu_lock(&ac->mu);
   if (ac->fd != NULL) {
     grpc_fd_shutdown(exec_ctx, ac->fd);
   }
   done = (--ac->refs == 0);
   gpr_mu_unlock(&ac->mu);
   if (done) {
     gpr_mu_destroy(&ac->mu);
     gpr_free(ac->addr_str);
     gpr_free(ac);
   }
 }

 static void on_writable(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) {
   async_connect *ac = acp;
   int so_error = 0;
   socklen_t so_error_size;
   int err;
   int done;
   grpc_endpoint **ep = ac->ep;
   grpc_closure *closure = ac->closure;
   grpc_fd *fd;

   GRPC_ERROR_REF(error);

   if (grpc_tcp_trace) {
     const char *str = grpc_error_string(error);
     gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_writable: error=%s",
             ac->addr_str, str);
     grpc_error_free_string(str);
   }

   gpr_mu_lock(&ac->mu);
   GPR_ASSERT(ac->fd);
   fd = ac->fd;
   ac->fd = NULL;
   gpr_mu_unlock(&ac->mu);

   grpc_timer_cancel(exec_ctx, &ac->alarm);

   gpr_mu_lock(&ac->mu);
   if (error == GRPC_ERROR_NONE) {
     do {
       so_error_size = sizeof(so_error);
       err = getsockopt(grpc_fd_wrapped_fd(fd), SOL_SOCKET, SO_ERROR, &so_error,
                        &so_error_size);
     } while (err < 0 && errno == EINTR);
     if (err < 0) {
       error = GRPC_OS_ERROR(errno, "getsockopt");
       goto finish;
     } else if (so_error != 0) {
       if (so_error == ENOBUFS) {
         /* We will get one of these errors if we have run out of
            memory in the kernel for the data structures allocated
            when you connect a socket.  If this happens it is very
            likely that if we wait a little bit then try again the
            connection will work (since other programs or this
            program will close their network connections and free up
            memory).  This does _not_ indicate that there is anything
            wrong with the server we are connecting to, this is a
            local problem.

            If you are looking at this code, then chances are that
            your program or another program on the same computer
            opened too many network connections.  The "easy" fix:
            don't do that! */
         gpr_log(GPR_ERROR, "kernel out of buffers");
         gpr_mu_unlock(&ac->mu);
         grpc_fd_notify_on_write(exec_ctx, fd, &ac->write_closure);
         return;
       } else {
         switch (so_error) {
           case ECONNREFUSED:
             error = grpc_error_set_int(error, GRPC_ERROR_INT_ERRNO, errno);
             error = grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR,
                                        "Connection refused");
             break;
           default:
             error = GRPC_OS_ERROR(errno, "getsockopt(SO_ERROR)");
             break;
         }
         goto finish;
       }
     } else {
       grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd);
       *ep = grpc_tcp_create(fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, ac->addr_str);
       fd = NULL;
       goto finish;
     }
   } else {
     error =
         grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR, "Timeout occurred");
     goto finish;
   }

   GPR_UNREACHABLE_CODE(return );

 finish:
   if (fd != NULL) {
     grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd);
     grpc_fd_orphan(exec_ctx, fd, NULL, NULL, "tcp_client_orphan");
     fd = NULL;
   }
   done = (--ac->refs == 0);
   gpr_mu_unlock(&ac->mu);
   if (error != GRPC_ERROR_NONE) {
     error = grpc_error_set_str(error, GRPC_ERROR_STR_DESCRIPTION,
                                "Failed to connect to remote host");
     error =
         grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS, ac->addr_str);
   }
   if (done) {
     gpr_mu_destroy(&ac->mu);
     gpr_free(ac->addr_str);
     gpr_free(ac);
   }
   grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
 }

 static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx,
                                     grpc_closure *closure, grpc_endpoint **ep,
                                     grpc_pollset_set *interested_parties,
                                     const struct sockaddr *addr,
                                     size_t addr_len, gpr_timespec deadline) {
   int fd;
   grpc_dualstack_mode dsmode;
   int err;
   async_connect *ac;
   struct sockaddr_in6 addr6_v4mapped;
   struct sockaddr_in addr4_copy;
   grpc_fd *fdobj;
   char *name;
   char *addr_str;
   grpc_error *error;

   *ep = NULL;

   /* Use dualstack sockets where available. */
   if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) {
     addr = (const struct sockaddr *)&addr6_v4mapped;
     addr_len = sizeof(addr6_v4mapped);
   }

   error = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode, &fd);
   if (error != GRPC_ERROR_NONE) {
     grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
     return;
   }
   if (dsmode == GRPC_DSMODE_IPV4) {
     /* If we got an AF_INET socket, map the address back to IPv4. */
     GPR_ASSERT(grpc_sockaddr_is_v4mapped(addr, &addr4_copy));
     addr = (struct sockaddr *)&addr4_copy;
     addr_len = sizeof(addr4_copy);
   }
   if ((error = prepare_socket(addr, fd)) != GRPC_ERROR_NONE) {
     grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
     return;
   }

   do {
     GPR_ASSERT(addr_len < ~(socklen_t)0);
     err = connect(fd, addr, (socklen_t)addr_len);
   } while (err < 0 && errno == EINTR);

   addr_str = grpc_sockaddr_to_uri(addr);
   gpr_asprintf(&name, "tcp-client:%s", addr_str);

   fdobj = grpc_fd_create(fd, name);

   if (err >= 0) {
     *ep = grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str);
     grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL);
     goto done;
   }

   if (errno != EWOULDBLOCK && errno != EINPROGRESS) {
     grpc_fd_orphan(exec_ctx, fdobj, NULL, NULL, "tcp_client_connect_error");
     grpc_exec_ctx_sched(exec_ctx, closure, GRPC_OS_ERROR(errno, "connect"),
                         NULL);
     goto done;
   }

   grpc_pollset_set_add_fd(exec_ctx, interested_parties, fdobj);

   ac = gpr_malloc(sizeof(async_connect));
   ac->closure = closure;
   ac->ep = ep;
   ac->fd = fdobj;
   ac->interested_parties = interested_parties;
   ac->addr_str = addr_str;
   addr_str = NULL;
   gpr_mu_init(&ac->mu);
   ac->refs = 2;
   ac->write_closure.cb = on_writable;
   ac->write_closure.cb_arg = ac;

   if (grpc_tcp_trace) {
     gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting",
             ac->addr_str);
   }

   gpr_mu_lock(&ac->mu);
   grpc_timer_init(exec_ctx, &ac->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
                   tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC));
   grpc_fd_notify_on_write(exec_ctx, ac->fd, &ac->write_closure);
   gpr_mu_unlock(&ac->mu);

 done:
   gpr_free(name);
   gpr_free(addr_str);
 }

 // overridden by api_fuzzer.c
 void (*grpc_tcp_client_connect_impl)(
     grpc_exec_ctx *exec_ctx, grpc_closure *closure, grpc_endpoint **ep,
     grpc_pollset_set *interested_parties, const struct sockaddr *addr,
     size_t addr_len, gpr_timespec deadline) = tcp_client_connect_impl;

 void grpc_tcp_client_connect(grpc_exec_ctx *exec_ctx, grpc_closure *closure,
                              grpc_endpoint **ep,
                              grpc_pollset_set *interested_parties,
                              const struct sockaddr *addr, size_t addr_len,
                              gpr_timespec deadline) {
   grpc_tcp_client_connect_impl(exec_ctx, closure, ep, interested_parties, addr,
                                addr_len, deadline);
 }

 #endif
	/*
	*
	* Copyright 2015, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "src/core/lib/iomgr/port.h"

	#ifdef GPR_POSIX_SOCKET

	#include "src/core/lib/iomgr/tcp_client.h"

	#include <errno.h>
	#include <netinet/in.h>
	#include <string.h>
	#include <unistd.h>

	#include <grpc/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/string_util.h>
	#include <grpc/support/time.h>

	#include "src/core/lib/iomgr/ev_posix.h"
	#include "src/core/lib/iomgr/iomgr_posix.h"
	#include "src/core/lib/iomgr/sockaddr_utils.h"
	#include "src/core/lib/iomgr/socket_utils_posix.h"
	#include "src/core/lib/iomgr/tcp_posix.h"
	#include "src/core/lib/iomgr/timer.h"
	#include "src/core/lib/iomgr/unix_sockets_posix.h"
	#include "src/core/lib/support/string.h"

	extern int grpc_tcp_trace;

	typedef struct {
	gpr_mu mu;
	grpc_fd *fd;
	gpr_timespec deadline;
	grpc_timer alarm;
	int refs;
	grpc_closure write_closure;
	grpc_pollset_set *interested_parties;
	char *addr_str;
	grpc_endpoint **ep;
	grpc_closure *closure;
	} async_connect;

	static grpc_error prepare_socket(const struct sockaddr addr, int fd) {
	grpc_error *err = GRPC_ERROR_NONE;

	GPR_ASSERT(fd >= 0);

	err = grpc_set_socket_nonblocking(fd, 1);
	if (err != GRPC_ERROR_NONE) goto error;
	err = grpc_set_socket_cloexec(fd, 1);
	if (err != GRPC_ERROR_NONE) goto error;
	if (!grpc_is_unix_socket(addr)) {
	err = grpc_set_socket_low_latency(fd, 1);
	if (err != GRPC_ERROR_NONE) goto error;
	}
	err = grpc_set_socket_no_sigpipe_if_possible(fd);
	if (err != GRPC_ERROR_NONE) goto error;
	goto done;

	error:
	if (fd >= 0) {
	close(fd);
	}
	done:
	return err;
	}

	static void tc_on_alarm(grpc_exec_ctx exec_ctx, void acp, grpc_error *error) {
	int done;
	async_connect *ac = acp;
	if (grpc_tcp_trace) {
	const char *str = grpc_error_string(error);
	gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: error=%s", ac->addr_str,
	str);
	grpc_error_free_string(str);
	}
	gpr_mu_lock(&ac->mu);
	if (ac->fd != NULL) {
	grpc_fd_shutdown(exec_ctx, ac->fd);
	}
	done = (--ac->refs == 0);
	gpr_mu_unlock(&ac->mu);
	if (done) {
	gpr_mu_destroy(&ac->mu);
	gpr_free(ac->addr_str);
	gpr_free(ac);
	}
	}

	static void on_writable(grpc_exec_ctx exec_ctx, void acp, grpc_error *error) {
	async_connect *ac = acp;
	int so_error = 0;
	socklen_t so_error_size;
	int err;
	int done;
	grpc_endpoint **ep = ac->ep;
	grpc_closure *closure = ac->closure;
	grpc_fd *fd;

	GRPC_ERROR_REF(error);

	if (grpc_tcp_trace) {
	const char *str = grpc_error_string(error);
	gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_writable: error=%s",
	ac->addr_str, str);
	grpc_error_free_string(str);
	}

	gpr_mu_lock(&ac->mu);
	GPR_ASSERT(ac->fd);
	fd = ac->fd;
	ac->fd = NULL;
	gpr_mu_unlock(&ac->mu);

	grpc_timer_cancel(exec_ctx, &ac->alarm);

	gpr_mu_lock(&ac->mu);
	if (error == GRPC_ERROR_NONE) {
	do {
	so_error_size = sizeof(so_error);
	err = getsockopt(grpc_fd_wrapped_fd(fd), SOL_SOCKET, SO_ERROR, &so_error,
	&so_error_size);
	} while (err < 0 && errno == EINTR);
	if (err < 0) {
	error = GRPC_OS_ERROR(errno, "getsockopt");
	goto finish;
	} else if (so_error != 0) {
	if (so_error == ENOBUFS) {
	/* We will get one of these errors if we have run out of
	memory in the kernel for the data structures allocated
	when you connect a socket. If this happens it is very
	likely that if we wait a little bit then try again the
	connection will work (since other programs or this
	program will close their network connections and free up
	memory). This does _not_ indicate that there is anything
	wrong with the server we are connecting to, this is a
	local problem.

	If you are looking at this code, then chances are that
	your program or another program on the same computer
	opened too many network connections. The "easy" fix:
	don't do that! */
	gpr_log(GPR_ERROR, "kernel out of buffers");
	gpr_mu_unlock(&ac->mu);
	grpc_fd_notify_on_write(exec_ctx, fd, &ac->write_closure);
	return;
	} else {
	switch (so_error) {
	case ECONNREFUSED:
	error = grpc_error_set_int(error, GRPC_ERROR_INT_ERRNO, errno);
	error = grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR,
	"Connection refused");
	break;
	default:
	error = GRPC_OS_ERROR(errno, "getsockopt(SO_ERROR)");
	break;
	}
	goto finish;
	}
	} else {
	grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd);
	*ep = grpc_tcp_create(fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, ac->addr_str);
	fd = NULL;
	goto finish;
	}
	} else {
	error =
	grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR, "Timeout occurred");
	goto finish;
	}

	GPR_UNREACHABLE_CODE(return );

	finish:
	if (fd != NULL) {
	grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd);
	grpc_fd_orphan(exec_ctx, fd, NULL, NULL, "tcp_client_orphan");
	fd = NULL;
	}
	done = (--ac->refs == 0);
	gpr_mu_unlock(&ac->mu);
	if (error != GRPC_ERROR_NONE) {
	error = grpc_error_set_str(error, GRPC_ERROR_STR_DESCRIPTION,
	"Failed to connect to remote host");
	error =
	grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS, ac->addr_str);
	}
	if (done) {
	gpr_mu_destroy(&ac->mu);
	gpr_free(ac->addr_str);
	gpr_free(ac);
	}
	grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
	}

	static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx,
	grpc_closure closure, grpc_endpoint *ep,
	grpc_pollset_set *interested_parties,
	const struct sockaddr *addr,
	size_t addr_len, gpr_timespec deadline) {
	int fd;
	grpc_dualstack_mode dsmode;
	int err;
	async_connect *ac;
	struct sockaddr_in6 addr6_v4mapped;
	struct sockaddr_in addr4_copy;
	grpc_fd *fdobj;
	char *name;
	char *addr_str;
	grpc_error *error;

	*ep = NULL;

	/* Use dualstack sockets where available. */
	if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) {
	addr = (const struct sockaddr *)&addr6_v4mapped;
	addr_len = sizeof(addr6_v4mapped);
	}

	error = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode, &fd);
	if (error != GRPC_ERROR_NONE) {
	grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
	return;
	}
	if (dsmode == GRPC_DSMODE_IPV4) {
	/* If we got an AF_INET socket, map the address back to IPv4. */
	GPR_ASSERT(grpc_sockaddr_is_v4mapped(addr, &addr4_copy));
	addr = (struct sockaddr *)&addr4_copy;
	addr_len = sizeof(addr4_copy);
	}
	if ((error = prepare_socket(addr, fd)) != GRPC_ERROR_NONE) {
	grpc_exec_ctx_sched(exec_ctx, closure, error, NULL);
	return;
	}

	do {
	GPR_ASSERT(addr_len < ~(socklen_t)0);
	err = connect(fd, addr, (socklen_t)addr_len);
	} while (err < 0 && errno == EINTR);

	addr_str = grpc_sockaddr_to_uri(addr);
	gpr_asprintf(&name, "tcp-client:%s", addr_str);

	fdobj = grpc_fd_create(fd, name);

	if (err >= 0) {
	*ep = grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str);
	grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL);
	goto done;
	}

	if (errno != EWOULDBLOCK && errno != EINPROGRESS) {
	grpc_fd_orphan(exec_ctx, fdobj, NULL, NULL, "tcp_client_connect_error");
	grpc_exec_ctx_sched(exec_ctx, closure, GRPC_OS_ERROR(errno, "connect"),
	NULL);
	goto done;
	}

	grpc_pollset_set_add_fd(exec_ctx, interested_parties, fdobj);

	ac = gpr_malloc(sizeof(async_connect));
	ac->closure = closure;
	ac->ep = ep;
	ac->fd = fdobj;
	ac->interested_parties = interested_parties;
	ac->addr_str = addr_str;
	addr_str = NULL;
	gpr_mu_init(&ac->mu);
	ac->refs = 2;
	ac->write_closure.cb = on_writable;
	ac->write_closure.cb_arg = ac;

	if (grpc_tcp_trace) {
	gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting",
	ac->addr_str);
	}

	gpr_mu_lock(&ac->mu);
	grpc_timer_init(exec_ctx, &ac->alarm,
	gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
	tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC));
	grpc_fd_notify_on_write(exec_ctx, ac->fd, &ac->write_closure);
	gpr_mu_unlock(&ac->mu);

	done:
	gpr_free(name);
	gpr_free(addr_str);
	}

	// overridden by api_fuzzer.c
	void (*grpc_tcp_client_connect_impl)(
	grpc_exec_ctx exec_ctx, grpc_closure closure, grpc_endpoint **ep,
	grpc_pollset_set interested_parties, const struct sockaddr addr,
	size_t addr_len, gpr_timespec deadline) = tcp_client_connect_impl;

	void grpc_tcp_client_connect(grpc_exec_ctx exec_ctx, grpc_closure closure,
	grpc_endpoint **ep,
	grpc_pollset_set *interested_parties,
	const struct sockaddr *addr, size_t addr_len,
	gpr_timespec deadline) {
	grpc_tcp_client_connect_impl(exec_ctx, closure, ep, interested_parties, addr,
	addr_len, deadline);
	}

	#endif