Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2014, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include "src/core/endpoint/socket_utils.h" |
| 35 | |
| 36 | #include <limits.h> |
| 37 | #include <fcntl.h> |
| 38 | #include <netinet/in.h> |
| 39 | #include <netinet/tcp.h> |
| 40 | #include <stdio.h> |
| 41 | #include <sys/types.h> |
| 42 | #include <sys/socket.h> |
| 43 | #include <unistd.h> |
| 44 | #include <string.h> |
| 45 | #include <errno.h> |
| 46 | |
| 47 | /* set a socket to non blocking mode */ |
| 48 | int grpc_set_socket_nonblocking(int fd, int non_blocking) { |
| 49 | int oldflags = fcntl(fd, F_GETFL, 0); |
| 50 | if (oldflags < 0) { |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | if (non_blocking) { |
| 55 | oldflags |= O_NONBLOCK; |
| 56 | } else { |
| 57 | oldflags &= ~O_NONBLOCK; |
| 58 | } |
| 59 | |
| 60 | if (fcntl(fd, F_SETFL, oldflags) != 0) { |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | return 1; |
| 65 | } |
| 66 | |
| 67 | /* set a socket to close on exec */ |
| 68 | int grpc_set_socket_cloexec(int fd, int close_on_exec) { |
| 69 | int oldflags = fcntl(fd, F_GETFD, 0); |
| 70 | if (oldflags < 0) { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | if (close_on_exec) { |
| 75 | oldflags |= FD_CLOEXEC; |
| 76 | } else { |
| 77 | oldflags &= ~FD_CLOEXEC; |
| 78 | } |
| 79 | |
| 80 | if (fcntl(fd, F_SETFD, oldflags) != 0) { |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | /* set a socket to reuse old addresses */ |
| 88 | int grpc_set_socket_reuse_addr(int fd, int reuse) { |
| 89 | int val = (reuse != 0); |
| 90 | int newval; |
| 91 | socklen_t intlen = sizeof(newval); |
| 92 | return 0 == setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) && |
| 93 | 0 == getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &newval, &intlen) && |
| 94 | newval == val; |
| 95 | } |
| 96 | |
| 97 | /* disable nagle */ |
| 98 | int grpc_set_socket_low_latency(int fd, int low_latency) { |
| 99 | int val = (low_latency != 0); |
| 100 | int newval; |
| 101 | socklen_t intlen = sizeof(newval); |
| 102 | return 0 == setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) && |
| 103 | 0 == getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &newval, &intlen) && |
| 104 | newval == val; |
| 105 | } |