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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>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
#define EXPECTED_BYTES 5
#define BUFLEN 16
int result = 0;
int sock;
char buf[BUFLEN];
char expected[] = "emscripten";
struct sockaddr_in si_host,
si_peer;
struct iovec iov[1];
struct msghdr hdr;
int done = 0;
void iter() {
int n;
n = recvmsg(sock, &hdr, 0);
if(0 < n) {
done = 1;
fprintf(stderr, "received %d bytes: %s", n, (char*)hdr.msg_iov[0].iov_base);
shutdown(sock, SHUT_RDWR);
close(sock);
#ifdef __EMSCRIPTEN__
if(strlen((char*)hdr.msg_iov[0].iov_base) == strlen(expected) &&
0 == strncmp((char*)hdr.msg_iov[0].iov_base, expected, strlen(expected))) {
result = 1;
}
REPORT_RESULT();
exit(EXIT_SUCCESS);
emscripten_cancel_main_loop();
#endif
} else if(EWOULDBLOCK != errno) {
perror("recvmsg failed");
exit(EXIT_FAILURE);
emscripten_cancel_main_loop();
}
}
int main(void)
{
memset(&si_host, 0, sizeof(struct sockaddr_in));
memset(&si_peer, 0, sizeof(struct sockaddr_in));
si_host.sin_family = AF_INET;
si_host.sin_port = htons(8991);
si_host.sin_addr.s_addr = htonl(INADDR_ANY);
if(-1 == (sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP))) {
perror("cannot create host socket");
exit(EXIT_FAILURE);
}
if(-1 == bind(sock, (struct sockaddr*)&si_host, sizeof(struct sockaddr))) {
perror("cannot bind host socket");
exit(EXIT_FAILURE);
}
iov[0].iov_base = buf;
iov[0].iov_len = sizeof(buf);
memset (&hdr, 0, sizeof (struct msghdr));
hdr.msg_name = &si_peer;
hdr.msg_namelen = sizeof(struct sockaddr_in);
hdr.msg_iov = iov;
hdr.msg_iovlen = 1;
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(iter, 0, 0);
#else
while (!done) iter();
#endif
return EXIT_SUCCESS;
}
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