mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-02-09 02:29:07 +08:00
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*************************************************************************\
|
|
* Copyright (C) Michael Kerrisk, 2018. *
|
|
* *
|
|
* This program is free software. You may use, modify, and redistribute it *
|
|
* under the terms of the GNU General Public License as published by the *
|
|
* Free Software Foundation, either version 3 or (at your option) any *
|
|
* later version. This program is distributed without any warranty. See *
|
|
* the file COPYING.gpl-v3 for details. *
|
|
\*************************************************************************/
|
|
|
|
/* Listing 57-6 */
|
|
|
|
/* ud_ucase_sv.c
|
|
|
|
A server that uses a UNIX domain datagram socket to receive datagrams,
|
|
convert their contents to uppercase, and then return them to the senders.
|
|
|
|
See also ud_ucase_cl.c.
|
|
*/
|
|
#include "ud_ucase.h"
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct sockaddr_un svaddr, claddr;
|
|
int sfd, j;
|
|
ssize_t numBytes;
|
|
socklen_t len;
|
|
char buf[BUF_SIZE];
|
|
|
|
sfd = socket(AF_UNIX, SOCK_DGRAM, 0); /* Create server socket */
|
|
if (sfd == -1)
|
|
errExit("socket");
|
|
|
|
/* Construct well-known address and bind server socket to it */
|
|
|
|
/* For an explanation of the following check, see the erratum note for
|
|
page 1168 at http://www.man7.org/tlpi/errata/. */
|
|
|
|
if (strlen(SV_SOCK_PATH) > sizeof(svaddr.sun_path) - 1)
|
|
fatal("Server socket path too long: %s", SV_SOCK_PATH);
|
|
|
|
if (remove(SV_SOCK_PATH) == -1 && errno != ENOENT)
|
|
errExit("remove-%s", SV_SOCK_PATH);
|
|
|
|
memset(&svaddr, 0, sizeof(struct sockaddr_un));
|
|
svaddr.sun_family = AF_UNIX;
|
|
strncpy(svaddr.sun_path, SV_SOCK_PATH, sizeof(svaddr.sun_path) - 1);
|
|
|
|
if (bind(sfd, (struct sockaddr *) &svaddr, sizeof(struct sockaddr_un)) == -1)
|
|
errExit("bind");
|
|
|
|
/* Receive messages, convert to uppercase, and return to client */
|
|
|
|
for (;;) {
|
|
len = sizeof(struct sockaddr_un);
|
|
numBytes = recvfrom(sfd, buf, BUF_SIZE, 0,
|
|
(struct sockaddr *) &claddr, &len);
|
|
if (numBytes == -1)
|
|
errExit("recvfrom");
|
|
|
|
printf("Server received %ld bytes from %s\n", (long) numBytes,
|
|
claddr.sun_path);
|
|
|
|
for (j = 0; j < numBytes; j++)
|
|
buf[j] = toupper((unsigned char) buf[j]);
|
|
|
|
if (sendto(sfd, buf, numBytes, 0, (struct sockaddr *) &claddr, len) !=
|
|
numBytes)
|
|
fatal("sendto");
|
|
}
|
|
}
|