129 lines
3.1 KiB
C
Executable file
129 lines
3.1 KiB
C
Executable file
/*
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* Test name: test06_srv.c
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*
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* Objective: Test a simple TCP server
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*
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* Description: Implements a simple echo server using the TCP protocol. Instead
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* of blocking on read(), it performs a select call first blocking there
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* until there is data to be read
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/select.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <net/netlib.h>
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#include <net/gen/netdb.h>
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#include <net/gen/in.h>
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#include <net/gen/tcp.h>
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#include <net/gen/tcp_io.h>
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#include <net/hton.h>
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#include <net/gen/inet.h>
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#define PORT 6060L
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int listen(long port) {
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char *tcp_device;
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int netfd;
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nwio_tcpconf_t tcpconf;
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nwio_tcpcl_t tcplistenopt;
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/* Get default UDP device */
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if ((tcp_device = getenv("TCP_DEVICE")) == NULL)
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tcp_device = TCP_DEVICE;
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/* Open TCP connection */
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if ((netfd = open(tcp_device, O_RDWR)) < 0)
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{
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fprintf(stderr,"Error opening TCP connection\n");
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return -1;
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}
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/* Configure TCP connection */
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tcpconf.nwtc_flags = NWTC_LP_SET | NWTC_UNSET_RA | NWTC_UNSET_RP;
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tcpconf.nwtc_locport = (tcpport_t) htons(port);
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if ((ioctl(netfd, NWIOSTCPCONF, &tcpconf))<0)
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{
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fprintf(stderr,"Error configuring the connection\n");
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close(netfd);
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return -1;
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}
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/* Get communication options */
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if ((ioctl(netfd, NWIOGTCPCONF, &tcpconf)) < 0) {
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fprintf(stderr, "Error getting configuration\n");
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close(netfd);
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return -1;
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}
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/* Set conf options */
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tcplistenopt.nwtcl_flags = 0;
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printf("Waiting for connections...\n");
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while ((ioctl(netfd, NWIOTCPLISTEN, &tcplistenopt)) == -1)
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{
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if (errno != EAGAIN)
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{
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fprintf(stderr,"Unable to listen for connections\n");
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close(netfd);
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}
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sleep(-1);
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}
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return netfd;
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}
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int main(int argc,char *argv[]) {
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int fd;
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ssize_t data_read;
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char buffer[1024];
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int ret;
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fd_set fds_read;
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if ((fd = listen(PORT)) < 0) {
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exit(-1);
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}
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printf("Waiting for messages on port: %ld\n", PORT);
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fflush(stdout);
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/* Initialize fd_set */
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FD_ZERO(&fds_read);
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FD_SET(fd, &fds_read);
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while (1)
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{
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/* Wait for data available to be read (no timeout) */
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ret = select(4, &fds_read, NULL, NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Error on select: %d\n", errno);
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exit(-1);
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}
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if (!FD_ISSET(fd, &fds_read)) {
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printf("Error: network fd is not ready (?)\n");
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exit(-1);
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}
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printf("Ready to receive...\n");
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/* Read received data */
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data_read = read(fd, &buffer, 1024);
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printf("Received data: %s\n", buffer);
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/* Can exit if the received string == exit */
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if (!strcmp(buffer,"exit"))
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break;
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/* Write the same back */
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write(fd, &buffer, data_read);
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}
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printf("Connection finished\n");
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close(fd);
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}
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