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 #include <sys/stdint.h> 35 36 #include <netinet/in.h> 37 38 #include <arpa/inet.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <signal.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 /* 48 * Simple micro-benchmark to see how many connections/second can be created 49 * in a serialized fashion against a given server. A timer signal is used 50 * to interrupt the loop and assess the cost. 51 */ 52 #define SECONDS 60 53 #define PORT 6060 54 55 static int timer_fired; 56 57 /* 58 * Signal timer, which both interrupts the in-progress socket operation, and 59 * flags the timer as having fired so the main loop can exit. 60 */ 61 static void 62 alarm_handler(__unused int signum) 63 { 64 65 timer_fired = 1; 66 } 67 68 /* 69 * Build a connection. In order to make sure the signal interrupts us as 70 * we wait, use non-blocking sockets and select(). Return 0 on success, or 71 * -1 if we were interrupted. Exit with a failure if we get an unspected 72 * error. 73 */ 74 static int 75 try_connect(struct sockaddr_in *sin) 76 { 77 struct 78 fd_set read_set; 79 int i, s; 80 81 s = socket(PF_INET, SOCK_STREAM, 0); 82 if (s < 0) 83 err(-1, "socket(PF_INET, SOCK_STREAM)"); 84 85 i = 1; 86 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0) 87 err(-1, "fcntl(s, FIOBIO, 1)"); 88 89 FD_ZERO(&read_set); 90 FD_SET(s, &read_set); 91 92 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 && 93 errno != EINPROGRESS) 94 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr)); 95 96 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) { 97 if ((errno == EINTR && !timer_fired) || (errno != EINTR)) 98 err(-1, "select"); 99 return (-1); 100 } 101 102 close(s); 103 return (0); 104 } 105 106 107 int 108 main(int argc, char *argv[]) 109 { 110 struct sockaddr_in sin; 111 u_int64_t counter; 112 113 if (argc != 2) 114 errx(-1, "usage: tcpconnect [ip]"); 115 116 bzero(&sin, sizeof(sin)); 117 sin.sin_family = AF_INET; 118 sin.sin_len = sizeof(sin); 119 sin.sin_addr.s_addr = inet_addr(argv[1]); 120 sin.sin_port = htons(PORT); 121 122 if (signal(SIGALRM, alarm_handler) == SIG_ERR) 123 err(-1, "signal(SIGALRM)"); 124 125 alarm(SECONDS); 126 127 counter = 0; 128 while (!timer_fired) { 129 if (try_connect(&sin) == 0) 130 counter++; 131 } 132 printf("%ju count\n", (uintmax_t)counter); 133 printf("%ju connections/second\n", (uintmax_t)(counter / SECONDS)); 134 135 return (0); 136 } 137