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 27 #include <sys/types.h> 28 #include <sys/fcntl.h> 29 #include <sys/ioctl.h> 30 #include <sys/select.h> 31 #include <sys/socket.h> 32 #include <sys/stdint.h> 33 34 #include <netinet/in.h> 35 36 #include <arpa/inet.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <signal.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 /* 46 * Simple micro-benchmark to see how many connections/second can be created 47 * in a serialized fashion against a given server. A timer signal is used 48 * to interrupt the loop and assess the cost. 49 */ 50 #define SECONDS 60 51 #define PORT 6060 52 53 static int timer_fired; 54 55 /* 56 * Signal timer, which both interrupts the in-progress socket operation, and 57 * flags the timer as having fired so the main loop can exit. 58 */ 59 static void 60 alarm_handler(__unused int signum) 61 { 62 63 timer_fired = 1; 64 } 65 66 /* 67 * Build a connection. In order to make sure the signal interrupts us as 68 * we wait, use non-blocking sockets and select(). Return 0 on success, or 69 * -1 if we were interrupted. Exit with a failure if we get an unspected 70 * error. 71 */ 72 static int 73 try_connect(struct sockaddr_in *sin) 74 { 75 struct 76 fd_set read_set; 77 int i, s; 78 79 s = socket(PF_INET, SOCK_STREAM, 0); 80 if (s < 0) 81 err(-1, "socket(PF_INET, SOCK_STREAM)"); 82 83 i = 1; 84 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0) 85 err(-1, "fcntl(s, FIOBIO, 1)"); 86 87 FD_ZERO(&read_set); 88 FD_SET(s, &read_set); 89 90 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 && 91 errno != EINPROGRESS) 92 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr)); 93 94 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) { 95 if ((errno == EINTR && !timer_fired) || (errno != EINTR)) 96 err(-1, "select"); 97 return (-1); 98 } 99 100 close(s); 101 return (0); 102 } 103 104 105 int 106 main(int argc, char *argv[]) 107 { 108 struct sockaddr_in sin; 109 u_int64_t counter; 110 111 if (argc != 2) 112 errx(-1, "usage: tcpconnect [ip]"); 113 114 bzero(&sin, sizeof(sin)); 115 sin.sin_family = AF_INET; 116 sin.sin_len = sizeof(sin); 117 sin.sin_addr.s_addr = inet_addr(argv[1]); 118 sin.sin_port = htons(PORT); 119 120 if (signal(SIGALRM, alarm_handler) == SIG_ERR) 121 err(-1, "signal(SIGALRM)"); 122 123 alarm(SECONDS); 124 125 counter = 0; 126 while (!timer_fired) { 127 if (try_connect(&sin) == 0) 128 counter++; 129 } 130 printf("%ju count\n", (uintmax_t)counter); 131 printf("%ju connections/second\n", (uintmax_t)(counter / SECONDS)); 132 133 return (0); 134 } 135