1 /*- 2 * Copyright (c) 2005 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/types.h> 30 #include <sys/fcntl.h> 31 #include <sys/ioctl.h> 32 #include <sys/select.h> 33 #include <sys/socket.h> 34 35 #include <netinet/in.h> 36 37 #include <arpa/inet.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <signal.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 /* 47 * Simple micro-benchmark to see how many connections/second can be created 48 * in a serialized fashion against a given server. A timer signal is used 49 * to interrupt the loop and assess the cost. 50 */ 51 #define SECONDS 60 52 #define PORT 6060 53 54 static int timer_fired; 55 56 /* 57 * Signal timer, which both interrupts the in-progress socket operation, and 58 * flags the timer as having fired so the main loop can exit. 59 */ 60 static void 61 alarm_handler(__unused int signum) 62 { 63 64 timer_fired = 1; 65 } 66 67 /* 68 * Build a connection. In order to make sure the signal interrupts us as 69 * we wait, use non-blocking sockets and select(). Return 0 on success, or 70 * -1 if we were interrupted. Exit with a failure if we get an unspected 71 * error. 72 */ 73 static int 74 try_connect(struct sockaddr_in *sin) 75 { 76 struct 77 fd_set read_set; 78 int i, s; 79 80 s = socket(PF_INET, SOCK_STREAM, 0); 81 if (s < 0) 82 err(-1, "socket(PF_INET, SOCK_STREAM)"); 83 84 i = 1; 85 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0) 86 err(-1, "fcntl(s, FIOBIO, 1)"); 87 88 FD_ZERO(&read_set); 89 FD_SET(s, &read_set); 90 91 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 && 92 errno != EINPROGRESS) 93 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr)); 94 95 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) { 96 if ((errno == EINTR && !timer_fired) || (errno != EINTR)) 97 err(-1, "select"); 98 return (-1); 99 } 100 101 close(s); 102 return (0); 103 } 104 105 106 int 107 main(int argc, char *argv[]) 108 { 109 struct sockaddr_in sin; 110 u_int64_t counter; 111 112 if (argc != 2) 113 err(-1, "usage: tcpconnect [ip]"); 114 115 bzero(&sin, sizeof(sin)); 116 sin.sin_family = AF_INET; 117 sin.sin_len = sizeof(sin); 118 sin.sin_addr.s_addr = inet_addr(argv[1]); 119 sin.sin_port = htons(PORT); 120 121 if (signal(SIGALRM, alarm_handler) == SIG_ERR) 122 err(-1, "signal(SIGALRM)"); 123 124 alarm(SECONDS); 125 126 counter = 0; 127 while (!timer_fired) { 128 if (try_connect(&sin) == 0) 129 counter++; 130 } 131 printf("%llu count\n", counter); 132 printf("%llu connections/second\n", counter / SECONDS); 133 134 return (0); 135 } 136