diff options
Diffstat (limited to 'share/doc/psd/20.ipctut/dgramsend.c')
| -rw-r--r-- | share/doc/psd/20.ipctut/dgramsend.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/share/doc/psd/20.ipctut/dgramsend.c b/share/doc/psd/20.ipctut/dgramsend.c new file mode 100644 index 0000000..831fbf1 --- /dev/null +++ b/share/doc/psd/20.ipctut/dgramsend.c @@ -0,0 +1,80 @@ +.\" Copyright (c) 1986, 1993 +.\" The Regents of the University of California. 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. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. +.\" +.\" @(#)dgramsend.c 8.1 (Berkeley) 6/8/93 +.\" +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netdb.h> +#include <stdio.h> + +#define DATA "The sea is calm tonight, the tide is full . . ." + +/* + * Here I send a datagram to a receiver whose name I get from the command + * line arguments. The form of the command line is dgramsend hostname + * portnumber + */ + +main(argc, argv) + int argc; + char *argv[]; +{ + int sock; + struct sockaddr_in name; + struct hostent *hp, *gethostbyname(); + + /* Create socket on which to send. */ + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock < 0) { + perror("opening datagram socket"); + exit(1); + } + /* + * Construct name, with no wildcards, of the socket to send to. + * Getnostbyname() returns a structure including the network address + * of the specified host. The port number is taken from the command + * line. + */ + hp = gethostbyname(argv[1]); + if (hp == 0) { + fprintf(stderr, "%s: unknown host\n", argv[1]); + exit(2); + } + bcopy(hp->h_addr, &name.sin_addr, hp->h_length); + name.sin_family = AF_INET; + name.sin_port = htons(atoi(argv[2])); + /* Send message. */ + if (sendto(sock, DATA, sizeof(DATA), 0, &name, sizeof(name)) < 0) + perror("sending datagram message"); + close(sock); +} |
