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server.c

@@ -0,0 +1,80 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <pthread.h>
+
+#define PORT 8888
+#define BUFF_SIZE 2048
+#define MAX_CLIENTS 10
+
+typedef struct {
+	int fd;
+	struct sockaddr_in clients[MAX_CLIENTS + 1];
+} DATA;
+
+void *process_clients(void *p) {
+	DATA *data = (DATA *)p;
+	char buf[BUFF_SIZE + 1];
+
+	while (1) {
+		off_t ret = read(STDIN_FILENO, buf, sizeof(buf));
+		if (ret <= 0)
+			continue;
+
+		socklen_t len = sizeof(data->clients[0]);
+		for (size_t i = 0; i < MAX_CLIENTS; i++)
+			sendto(data->fd, buf, ret, 0, (struct sockaddr *)&data->clients[i], len);
+	}
+}
+
+int main(void) {
+	signal(SIGPIPE, SIG_IGN);
+
+	int fd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (fd < 0)
+		goto ERROR_WITHOUTCLOSE;
+
+	struct timeval tv = {.tv_sec = 1, .tv_usec = 0};
+	if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0)
+		goto ERROR;
+
+	int reuse = 1;
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(int)) < 0)
+		goto ERROR;
+
+	static struct sockaddr_in addr;
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(PORT);
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
+		goto ERROR;
+
+	static DATA data;
+	data.fd = fd;
+
+	pthread_t td;
+	pthread_create(&td, NULL, process_clients, (void *)&data);
+
+	int last = 0;
+	char buf[25];
+
+	socklen_t len = sizeof(data.clients[last]);
+	while (1) {
+		if (recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *)&data.clients[last], &len) > 0)
+			if (last <= MAX_CLIENTS)
+				last++;
+	}
+
+ERROR:
+	close(fd);
+
+ERROR_WITHOUTCLOSE:
+	fprintf(stderr, "streamer: %s\n", strerror(errno));
+	return 1;
+}