minix/test/select/test07_srv.c

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/*
* Test name: test07_srv.c
*
* Objective: Test an impatient TCP server with a timeout.
*
* Description: Implements an echo server using the TCP protocol. It is
* based on test06_srv.c but has a timeout for receiving data from a client
* and if the time is up it sends an angry message to the client requesting
* for more information.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <sys/asynchio.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <net/netlib.h>
#include <net/gen/netdb.h>
#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/hton.h>
#include <net/gen/inet.h>
#define PORT 6060L
int listen(long port) {
char *tcp_device;
int netfd;
nwio_tcpconf_t tcpconf;
nwio_tcpcl_t tcplistenopt;
/* Get default UDP device */
if ((tcp_device = getenv("TCP_DEVICE")) == NULL)
tcp_device = TCP_DEVICE;
/* Open TCP connection */
if ((netfd = open(tcp_device, O_RDWR)) < 0)
{
fprintf(stderr,"Error opening TCP connection\n");
return -1;
}
/* Configure TCP connection */
tcpconf.nwtc_flags = NWTC_LP_SET | NWTC_UNSET_RA | NWTC_UNSET_RP;
tcpconf.nwtc_locport = (tcpport_t) htons(port);
if ((ioctl(netfd, NWIOSTCPCONF, &tcpconf))<0)
{
fprintf(stderr,"Error configuring the connection\n");
close(netfd);
return -1;
}
/* Get communication options */
if ((ioctl(netfd, NWIOGTCPCONF, &tcpconf)) < 0) {
fprintf(stderr, "Error getting configuration\n");
close(netfd);
return -1;
}
/* Set conf options */
tcplistenopt.nwtcl_flags = 0;
printf("Waiting for connections...\n");
while ((ioctl(netfd, NWIOTCPLISTEN, &tcplistenopt)) == -1)
{
if (errno != EAGAIN)
{
fprintf(stderr,"Unable to listen for connections\n");
close(netfd);
}
sleep(-1);
}
return netfd;
}
int main(int argc,char *argv[]) {
int fd;
ssize_t data_read;
char buffer[1024];
int ret;
fd_set fds_read;
struct timeval timeout;
if ((fd = listen(PORT)) < 0) {
exit(-1);
}
printf("Waiting for messages on port: %ld\n", PORT);
fflush(stdout);
while (1)
{
/* Initialize fd_set */
FD_ZERO(&fds_read);
FD_SET(fd, &fds_read);
/* set timeout */
timeout.tv_sec = 3;
timeout.tv_usec = 0;
/* Wait for data available to be read (no timeout) */
ret = select(4, &fds_read, NULL, NULL, &timeout);
if (ret < 0) {
fprintf(stderr, "Error on select: %d\n", errno);
exit(-1);
}
/* timeout */
if (ret == 0) {
strcpy(buffer, "I want to get some data!!\n");
write(fd, &buffer, 1024);
continue;
}
/* data received from client */
if (FD_ISSET(fd, &fds_read)) {
printf("Ready to receive...\n");
/* Read received data */
data_read = read(fd, &buffer, 1024);
printf("Received data: %s\n", buffer);
/* Can exit if the received string == exit */
if (!strcmp(buffer,"exit"))
break;
/* Write the same back */
write(fd, &buffer, data_read);
}
}
printf("Connection finished\n");
close(fd);
}