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
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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
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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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>
35 #include <netinet/in.h>
37 #include <arpa/inet.h>
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.
54 static int timer_fired;
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.
61 alarm_handler(__unused int signum)
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
74 try_connect(struct sockaddr_in *sin)
80 s = socket(PF_INET, SOCK_STREAM, 0);
82 err(-1, "socket(PF_INET, SOCK_STREAM)");
85 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0)
86 err(-1, "fcntl(s, FIOBIO, 1)");
91 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 &&
93 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr));
95 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) {
96 if ((errno == EINTR && !timer_fired) || (errno != EINTR))
107 main(int argc, char *argv[])
109 struct sockaddr_in sin;
113 err(-1, "usage: tcpconnect [ip]");
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);
121 if (signal(SIGALRM, alarm_handler) == SIG_ERR)
122 err(-1, "signal(SIGALRM)");
127 while (!timer_fired) {
128 if (try_connect(&sin) == 0)
131 printf("%llu count\n", counter);
132 printf("%llu connections/second\n", counter / SECONDS);