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#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <assert.h>
#if EMSCRIPTEN
#include <emscripten.h>
#endif
int SocketFD;
int done = 0;
int sum = 0;
void iter(void *arg) {
char buffer[1024];
char packetLength;
int n;
int i;
if (done) {
return;
}
n = recv(SocketFD, buffer, 1, 0);
if (n == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
return; //try again
}
fprintf(stderr, "unexcepted end of data");
exit(EXIT_FAILURE);
}
if (n != 1) {
fprintf(stderr, "should read 1 byte");
exit(EXIT_FAILURE);
}
packetLength = buffer[0];
n = recv(SocketFD, buffer, packetLength, 0);
printf("got %d,%d\n", n, packetLength);
if (n != packetLength) {
fprintf(stderr, "lost packet data, expected: %d readed: %d", packetLength, n);
exit(EXIT_FAILURE);
}
for (i = 0; i < packetLength; ++i) {
if (buffer[i] != i+1) {
fprintf(stderr, "packet corrupted, expected: %d, actual: %d", i+1, buffer[i]);
exit(EXIT_FAILURE);
}
sum += buffer[i];
}
if (packetLength == buffer[0]) { // \x01\x01 - end marker
shutdown(SocketFD, SHUT_RDWR);
close(SocketFD);
done = 1;
#if EMSCRIPTEN
printf("sum: %d\n", sum);
int result = sum;
REPORT_RESULT();
#endif
}
}
int main(void)
{
struct sockaddr_in stSockAddr;
int Res;
SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (-1 == SocketFD)
{
perror("cannot create socket");
exit(EXIT_FAILURE);
}
memset(&stSockAddr, 0, sizeof(stSockAddr));
stSockAddr.sin_family = AF_INET;
stSockAddr.sin_port = htons(
#if EMSCRIPTEN
8991
#else
8990
#endif
);
Res = inet_pton(AF_INET, "127.0.0.1", &stSockAddr.sin_addr);
if (0 > Res) {
perror("error: first parameter is not a valid address family");
close(SocketFD);
exit(EXIT_FAILURE);
} else if (0 == Res) {
perror("char string (second parameter does not contain valid ipaddress)");
close(SocketFD);
exit(EXIT_FAILURE);
}
if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(stSockAddr))) {
perror("connect failed");
close(SocketFD);
exit(EXIT_FAILURE);
}
#if EMSCRIPTEN
emscripten_set_main_loop(iter, 0, 0);
#else
while (!done) iter(NULL);
#endif
return EXIT_SUCCESS;
}
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