init

Makefile

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+CC=c99
+
+all: fbflut
+
+fbflut: fbflut.o
+	${CC} -lpthread -o fbflut fbflut.o
+
+clean:
+	rm -f fbflut.o fbflut

README.md

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+# fbflut
+
+framebuffer pixelflut server in C.
+
+## running
+
+- compile with `make`
+- make sure you have read/write access
+  to the framebuffer (ie put yourself in the `video` group)
+- go in something that wont fight you for the framebuffer,
+  ie a tty
+- do `./fbflut`

fbflut.c

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+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <arpa/inet.h>
+#include <linux/fb.h>
+#include <unistd.h>
+
+int fbfd, fb_width, fb_height, fb_bytes;
+uint32_t *fbdata;
+
+void *handle_connection(void *socket_desc) {
+	int sock = *(int*)socket_desc;
+	int read_size;
+	char *message, client_message[25];
+
+	message = "doug doug doug";
+	write(sock, message, strlen(message));
+
+	return 0;
+}
+
+int main(int argc, char *argv[]) {
+	int port;
+
+	port = argc > 1 ? atoi(argv[1]) : 0;
+	if (!port)
+		port = 1234;
+
+	fbfd = open("/dev/fb0", O_RDWR);
+	if (fbfd >= 0) {
+		struct fb_var_screeninfo vinfo;
+
+		ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo);
+
+		fb_width = vinfo.xres;
+		fb_height = vinfo.yres;
+		fb_bytes = vinfo.bits_per_pixel / 8;
+
+		printf("width: %i, height: %i, bpp: %i\n", fb_width, fb_height, fb_bytes);
+
+		int fb_data_size = fb_width * fb_height * fb_bytes;
+
+		fbdata = mmap(0, fb_data_size, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, (off_t)0);
+
+		memset(fbdata, 0, fb_data_size); // clear the screen
+
+		
+		int socket_desc, client_sock, c;
+		struct sockaddr_in server, client;
+
+		socket_desc = socket(AF_INET, SOCK_STREAM, 0);
+
+		server.sin_family = AF_INET;
+		server.sin_addr.s_addr = INADDR_ANY;
+		server.sin_port = htons(port);
+
+		if (bind(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0)
+			return 15;
+
+		listen(socket_desc, 100);
+		c = sizeof(struct sockaddr_in);
+		pthread_t thread_id;
+
+		while (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) {
+
+			pthread_create(&thread_id, NULL, handle_connection, (void*) &client_sock);
+
+		}
+
+		return 0;
+	}
+
+}
+