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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
#define EXPECTED_BYTES 5
int SocketFD;
int not_always_data = 0;
unsigned int get_all_buf(int sock, char* output, unsigned int maxsize)
{
// select check for IO
fd_set sett;
FD_ZERO(&sett);
assert(select(64, &sett, NULL, NULL, NULL) == 0); // empty set
FD_SET(sock, &sett);
assert(select(0, &sett, NULL, NULL, NULL) == 0); // max FD to check is 0
assert(FD_ISSET(sock, &sett) == 0);
FD_SET(sock, &sett);
int select_says_yes = select(64, &sett, NULL, NULL, NULL);
// ioctl check for IO
int bytes;
if (ioctl(sock, FIONREAD, &bytes) || bytes == 0) {
not_always_data = 1;
assert(FD_ISSET(sock, &sett) == 0);
return 0;
}
assert(FD_ISSET(sock, &sett));
assert(select_says_yes); // ioctl must agree with select
char buffer[1024];
int n;
unsigned int offset = 0;
while((errno = 0, (n = recv(sock, buffer, sizeof(buffer), 0))>0) ||
errno == EINTR) {
if(n>0)
{
if (((unsigned int) n)+offset > maxsize) { fprintf(stderr, "too much data!"); exit(EXIT_FAILURE); }
memcpy(output+offset, buffer, n);
offset += n;
}
}
if(n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
fprintf(stderr, "error in get_all_buf!");
exit(EXIT_FAILURE);
}
return offset;
}
int done = 0;
void iter(void *arg) {
/* perform read write operations ... */
static char out[1024*2];
static int pos = 0;
int n = get_all_buf(SocketFD, out+pos, 1024-pos);
if (n) printf("read! %d\n", n);
pos += n;
if (pos >= EXPECTED_BYTES) {
int i, sum = 0;
for (i=0; i < pos; i++) {
printf("%x\n", out[i]);
sum += out[i];
}
shutdown(SocketFD, SHUT_RDWR);
close(SocketFD);
done = 1;
printf("sum: %d\n", sum);
#if EMSCRIPTEN
//assert(not_always_data == 1);
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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