2 * Copyright (c) 2005 Robert N. M. Watson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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>
36 #include <netinet/in.h>
38 #include <arpa/inet.h>
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.
55 static int timer_fired;
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.
62 alarm_handler(__unused int signum)
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
75 try_connect(struct sockaddr_in *sin)
81 s = socket(PF_INET, SOCK_STREAM, 0);
83 err(-1, "socket(PF_INET, SOCK_STREAM)");
86 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0)
87 err(-1, "fcntl(s, FIOBIO, 1)");
92 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 &&
94 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr));
96 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) {
97 if ((errno == EINTR && !timer_fired) || (errno != EINTR))
108 main(int argc, char *argv[])
110 struct sockaddr_in sin;
114 errx(-1, "usage: tcpconnect [ip]");
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);
122 if (signal(SIGALRM, alarm_handler) == SIG_ERR)
123 err(-1, "signal(SIGALRM)");
128 while (!timer_fired) {
129 if (try_connect(&sin) == 0)
132 printf("%ju count\n", (uintmax_t)counter);
133 printf("%ju connections/second\n", (uintmax_t)(counter / SECONDS));