mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/* Byte Stream Connection Server Example
|
|
Copyright (C) 1991-2015 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netdb.h>
|
|
|
|
#define PORT 5555
|
|
#define MAXMSG 512
|
|
|
|
int
|
|
read_from_client (int filedes)
|
|
{
|
|
char buffer[MAXMSG];
|
|
int nbytes;
|
|
|
|
nbytes = read (filedes, buffer, MAXMSG);
|
|
if (nbytes < 0)
|
|
{
|
|
/* Read error. */
|
|
perror ("read");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
else if (nbytes == 0)
|
|
/* End-of-file. */
|
|
return -1;
|
|
else
|
|
{
|
|
/* Data read. */
|
|
fprintf (stderr, "Server: got message: `%s'\n", buffer);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
extern int make_socket (uint16_t port);
|
|
int sock;
|
|
fd_set active_fd_set, read_fd_set;
|
|
int i;
|
|
struct sockaddr_in clientname;
|
|
size_t size;
|
|
|
|
/* Create the socket and set it up to accept connections. */
|
|
sock = make_socket (PORT);
|
|
if (listen (sock, 1) < 0)
|
|
{
|
|
perror ("listen");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
/* Initialize the set of active sockets. */
|
|
FD_ZERO (&active_fd_set);
|
|
FD_SET (sock, &active_fd_set);
|
|
|
|
while (1)
|
|
{
|
|
/* Block until input arrives on one or more active sockets. */
|
|
read_fd_set = active_fd_set;
|
|
if (select (FD_SETSIZE, &read_fd_set, NULL, NULL, NULL) < 0)
|
|
{
|
|
perror ("select");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
/* Service all the sockets with input pending. */
|
|
for (i = 0; i < FD_SETSIZE; ++i)
|
|
if (FD_ISSET (i, &read_fd_set))
|
|
{
|
|
if (i == sock)
|
|
{
|
|
/* Connection request on original socket. */
|
|
int new;
|
|
size = sizeof (clientname);
|
|
new = accept (sock,
|
|
(struct sockaddr *) &clientname,
|
|
&size);
|
|
if (new < 0)
|
|
{
|
|
perror ("accept");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
fprintf (stderr,
|
|
"Server: connect from host %s, port %hd.\n",
|
|
inet_ntoa (clientname.sin_addr),
|
|
ntohs (clientname.sin_port));
|
|
FD_SET (new, &active_fd_set);
|
|
}
|
|
else
|
|
{
|
|
/* Data arriving on an already-connected socket. */
|
|
if (read_from_client (i) < 0)
|
|
{
|
|
close (i);
|
|
FD_CLR (i, &active_fd_set);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|