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zerosend.c
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Editing: zerosend.c
/*- * Copyright (c) 2007 Robert N. M. Watson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <sys/select.h> #include <sys/socket.h> #include <sys/stat.h> #include <netinet/in.h> #include <arpa/inet.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdio.h> #include <string.h> #include <unistd.h> #define PORT1 10001 #define PORT2 10002 static void try_0send(const char *test, int fd) { ssize_t len; char ch; ch = 0; len = send(fd, &ch, 0, 0); if (len < 0) err(1, "%s: try_0send", test); if (len != 0) errx(1, "%s: try_0send: returned %zd", test, len); } static void try_0write(const char *test, int fd) { ssize_t len; char ch; ch = 0; len = write(fd, &ch, 0); if (len < 0) err(1, "%s: try_0write", test); if (len != 0) errx(1, "%s: try_0write: returned %zd", test, len); } static void setup_udp(const char *test, int *fdp, int port1, int port2) { struct sockaddr_in sin; int sock1, sock2; bzero(&sin, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); sin.sin_port = htons(port1); sock1 = socket(PF_INET, SOCK_DGRAM, 0); if (sock1 < 0) err(1, "%s: setup_udp: socket", test); if (bind(sock1, (struct sockaddr *)&sin, sizeof(sin)) < 0) err(1, "%s: setup_udp: bind(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT1); sin.sin_port = htons(port2); if (connect(sock1, (struct sockaddr *)&sin, sizeof(sin)) < 0) err(1, "%s: setup_udp: connect(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT2); sock2 = socket(PF_INET, SOCK_DGRAM, 0); if (sock2 < 0) err(1, "%s: setup_udp: socket", test); if (bind(sock2, (struct sockaddr *)&sin, sizeof(sin)) < 0) err(1, "%s: setup_udp: bind(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT2); sin.sin_port = htons(port1); if (connect(sock2, (struct sockaddr *)&sin, sizeof(sin)) < 0) err(1, "%s: setup_udp: connect(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT1); fdp[0] = sock1; fdp[1] = sock2; } static void setup_tcp(const char *test, int *fdp, int port) { fd_set writefds, exceptfds; struct sockaddr_in sin; int ret, sock1, sock2, sock3; struct timeval tv; bzero(&sin, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); /* * First set up the listen socket. */ sin.sin_port = htons(port); sock1 = socket(PF_INET, SOCK_STREAM, 0); if (sock1 < 0) err(1, "%s: setup_tcp: socket", test); if (bind(sock1, (struct sockaddr *)&sin, sizeof(sin)) < 0) err(1, "%s: bind(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT1); if (listen(sock1, -1) < 0) err(1, "%s: listen", test); /* * Now connect to it, non-blocking so that we don't deadlock against * ourselves. */ sock2 = socket(PF_INET, SOCK_STREAM, 0); if (sock2 < 0) err(1, "%s: setup_tcp: socket", test); if (fcntl(sock2, F_SETFL, O_NONBLOCK) < 0) err(1, "%s: setup_tcp: fcntl(O_NONBLOCK)", test); if (connect(sock2, (struct sockaddr *)&sin, sizeof(sin)) < 0 && errno != EINPROGRESS) err(1, "%s: setup_tcp: connect(%s, %d)", test, inet_ntoa(sin.sin_addr), PORT1); /* * Now pick up the connection after sleeping a moment to make sure * there's been time for some packets to go back and forth. */ if (sleep(1) != 0) err(1, "%s: sleep(1)", test); sock3 = accept(sock1, NULL, NULL); if (sock3 < 0) err(1, "%s: accept", test); if (sleep(1) != 0) err(1, "%s: sleep(1)", test); FD_ZERO(&writefds); FD_SET(sock2, &writefds); FD_ZERO(&exceptfds); FD_SET(sock2, &exceptfds); tv.tv_sec = 1; tv.tv_usec = 0; ret = select(sock2 + 1, NULL, &writefds, &exceptfds, &tv); if (ret < 0) err(1, "%s: setup_tcp: select", test); if (FD_ISSET(sock2, &exceptfds)) errx(1, "%s: setup_tcp: select: exception", test); if (!FD_ISSET(sock2, &writefds)) errx(1, "%s: setup_tcp: select: not writable", test); close(sock1); fdp[0] = sock2; fdp[1] = sock3; } static void setup_udsstream(const char *test, int *fdp) { if (socketpair(PF_LOCAL, SOCK_STREAM, 0, fdp) < 0) err(1, "%s: setup_udsstream: socketpair", test); } static void setup_udsdgram(const char *test, int *fdp) { if (socketpair(PF_LOCAL, SOCK_DGRAM, 0, fdp) < 0) err(1, "%s: setup_udsdgram: socketpair", test); } static void setup_pipe(const char *test, int *fdp) { if (pipe(fdp) < 0) err(1, "%s: setup_pipe: pipe", test); } static void setup_fifo(const char *test, int *fdp) { char path[] = "0send_fifo.XXXXXXX"; int fd1, fd2; if (mkstemp(path) == -1) err(1, "%s: setup_fifo: mktemp", test); unlink(path); if (mkfifo(path, 0600) < 0) err(1, "%s: setup_fifo: mkfifo(%s)", test, path); fd1 = open(path, O_RDONLY | O_NONBLOCK); if (fd1 < 0) err(1, "%s: setup_fifo: open(%s, O_RDONLY)", test, path); fd2 = open(path, O_WRONLY | O_NONBLOCK); if (fd2 < 0) err(1, "%s: setup_fifo: open(%s, O_WRONLY)", test, path); fdp[0] = fd2; fdp[1] = fd1; } static void close_both(int *fdp) { close(fdp[0]); fdp[0] = -1; close(fdp[1]); fdp[1] = -1; } int main(void) { int fd[2]; setup_udp("udp_0send", fd, PORT1, PORT2); try_0send("udp_0send", fd[0]); close_both(fd); setup_udp("udp_0write", fd, PORT1 + 10, PORT2 + 10); try_0write("udp_0write", fd[0]); close_both(fd); setup_tcp("tcp_0send", fd, PORT1); try_0send("tcp_0send", fd[0]); close_both(fd); setup_tcp("tcp_0write", fd, PORT1 + 10); try_0write("tcp_0write", fd[0]); close_both(fd); setup_udsstream("udsstream_0send", fd); try_0send("udsstream_0send", fd[0]); close_both(fd); setup_udsstream("udsstream_0write", fd); try_0write("udsstream_0write", fd[0]); close_both(fd); setup_udsdgram("udsdgram_0send", fd); try_0send("udsdgram_0send", fd[0]); close_both(fd); setup_udsdgram("udsdgram_0write", fd); try_0write("udsdgram_0write", fd[0]); close_both(fd); setup_pipe("pipe_0write", fd); try_0write("pipd_0write", fd[0]); close_both(fd); setup_fifo("fifo_0write", fd); try_0write("fifo_0write", fd[0]); close_both(fd); return (0); }
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