renamed socket tests

11 files changed, 1300 insertions, 0 deletions

diff --git a/tests/sockets/test_sockets.c b/tests/sockets/test_sockets.c
new file mode 100644
index 00000000..8845ef43
--- /dev/null
+++ b/tests/sockets/test_sockets.c
@@ -0,0 +1,143 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#include <assert.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 5
+
+int sockfd;
+int not_always_data = 0;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+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;
+    printf("ioctl says 0, FD_ISSET says %ld\n", FD_ISSET(sock, &sett));
+    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!");
+        finish(EXIT_FAILURE);
+      }
+      memcpy(output+offset, buffer, n);
+      offset += n;
+    }
+  }
+
+  if (n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+    fprintf(stderr, "error in get_all_buf! %d", errno);
+    finish(EXIT_FAILURE);
+  }
+  return offset;
+}
+
+void iter(void *arg) {
+  static char out[1024*2];
+  static int pos = 0;
+  fd_set fdr;
+  int res;
+
+  // make sure that sockfd is ready to read
+  FD_ZERO(&fdr);
+  FD_SET(sockfd, &fdr);
+  res = select(64, &fdr, NULL, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (!FD_ISSET(sockfd, &fdr)) {
+    return;
+  }
+
+  // perform read write operations ...
+  int n = get_all_buf(sockfd, 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(sockfd, SHUT_RDWR);
+
+    close(sockfd);
+
+    printf("sum: %d\n", sum);
+    finish(sum);
+  }
+}
+
+void main() {
+  struct sockaddr_in addr;
+  int res;
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+  
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_set_main_loop(iter, 0, 0);
+#else
+  while (1) iter(NULL);
+#endif
+}
+
diff --git a/tests/sockets/test_sockets_bi.c b/tests/sockets/test_sockets_bi.c
new file mode 100644
index 00000000..e19f7fe8
--- /dev/null
+++ b/tests/sockets/test_sockets_bi.c
@@ -0,0 +1,140 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 28
+
+int sockfd;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+unsigned int get_all_buf(int sock, char* output, unsigned int maxsize) {
+  int bytes;
+  if (ioctl(sock, FIONREAD, &bytes)) return 0;
+  if (bytes == 0) return 0;
+
+  char buffer[1024];
+  int n;
+  unsigned int offset = 0;
+#if TEST_FILE_OPS
+  while((errno = 0, (n = read(sock, buffer, sizeof(buffer)))>0) ||
+#else
+  while((errno = 0, (n = recv(sock, buffer, sizeof(buffer), 0))>0) ||
+#endif
+    errno == EINTR) {
+    if(n > 0) {
+      if (((unsigned int) n)+offset > maxsize) {
+        fprintf(stderr, "too much data!");
+        finish(EXIT_FAILURE);
+      }
+      memcpy(output+offset, buffer, n);
+      offset += n;
+    }
+  }
+
+  if(n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+    fprintf(stderr, "error in get_all_buf!");
+    finish(EXIT_FAILURE);
+  }
+  return offset;
+}
+
+void iter(void *arg) {
+  static char out[1024*2];
+  static int pos = 0;
+  fd_set fdr;
+  int res;
+
+  // make sure that sockfd is ready to read
+  FD_ZERO(&fdr);
+  FD_SET(sockfd, &fdr);
+  res = select(64, &fdr, NULL, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (!FD_ISSET(sockfd, &fdr)) {
+    return;
+  }
+
+  // perform read write operations ...
+  int n = get_all_buf(sockfd, 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(sockfd, SHUT_RDWR);
+    close(sockfd);
+
+    printf("sum: %d\n", sum);
+    finish(sum);
+  }
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  printf("hello from main page\n");
+
+#if !TEST_DGRAM
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+#else
+  sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+#endif
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+  
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+#if EMBED_SIDE
+  emscripten_run_script("console.log('adding iframe');"
+                        "var iframe = document.createElement('iframe');"
+                        "iframe.src = 'side.html';"
+                        "document.body.appendChild(iframe);"
+                        "console.log('added.');");
+#endif
+  emscripten_set_main_loop(iter, 0, 0);
+#else
+  while (1) iter(NULL);
+#endif
+
+  return EXIT_SUCCESS;
+}
diff --git a/tests/sockets/test_sockets_bi_bigdata.c b/tests/sockets/test_sockets_bi_bigdata.c
new file mode 100644
index 00000000..c1d8100e
--- /dev/null
+++ b/tests/sockets/test_sockets_bi_bigdata.c
@@ -0,0 +1,138 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#include "test_sockets_bigdata.h"
+
+#define EXPECTED_BYTES DATA_SIZE
+
+int sockfd;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+unsigned int get_all_buf(int sock, char* output, unsigned int maxsize) {
+  int bytes;
+  if (ioctl(sock, FIONREAD, &bytes)) return 0;
+  if (bytes == 0) return 0;
+
+  char buffer[EXPECTED_BYTES];
+  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!");
+        finish(EXIT_FAILURE);
+      }
+      memcpy(output+offset, buffer, n);
+      offset += n;
+    }
+  }
+
+  if (n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+    fprintf(stderr, "error in get_all_buf!");
+    finish(EXIT_FAILURE);
+  }
+  return offset;
+}
+
+void iter(void *arg) {
+  static char out[EXPECTED_BYTES];
+  static int pos = 0;
+  fd_set fdr;
+  int res;
+
+  // make sure that sockfd has finished connecting and is ready to read
+  FD_ZERO(&fdr);
+  FD_SET(sockfd, &fdr);
+  res = select(64, &fdr, NULL, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+    return;
+  } else if (!FD_ISSET(sockfd, &fdr)) {
+    return;
+  }
+
+  // perform read write operations ...
+  printf("so far %d, expecting up to %d\n", pos, EXPECTED_BYTES-pos);
+  res = get_all_buf(sockfd, out+pos, EXPECTED_BYTES-pos);
+  if (res) printf("read! %d\n", res);
+  pos += res;
+  if (pos >= EXPECTED_BYTES) {
+    shutdown(sockfd, SHUT_RDWR);
+
+    close(sockfd);
+
+    char *comp = generateData();
+    int result = strcmp(comp, out);
+    if (result != 0) {
+      for (int i = 0; i < DATA_SIZE; i++) {
+        printf("%d:%d\n", comp[i], out[i]);
+      }
+    }
+    finish(result);
+  }
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  printf("hello from main page\n");
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_run_script("console.log('adding iframe');"
+                        "var iframe = document.createElement('iframe');"
+                        "iframe.src = 'side.html';"
+                        "iframe.width = '100%';"
+                        "iframe.width = '40%';"
+                        "document.body.appendChild(iframe);"
+                        "console.log('added.');");
+  emscripten_set_main_loop(iter, 3, 0);
+#else
+  while (1) iter(NULL);
+#endif
+
+  return EXIT_SUCCESS;
+}
+
diff --git a/tests/sockets/test_sockets_bi_side.c b/tests/sockets/test_sockets_bi_side.c
new file mode 100644
index 00000000..b8910632
--- /dev/null
+++ b/tests/sockets/test_sockets_bi_side.c
@@ -0,0 +1,93 @@
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 5
+
+int sockfd = -1;
+
+void finish(int result) {
+  close(sockfd);
+  exit(result);
+}
+
+void loop() {
+  fd_set fdw;
+  int res;
+
+  // Make sure that sockfd has actually finished connecting
+  // and is ready to read.
+  FD_ZERO(&fdw);
+  FD_SET(sockfd, &fdw);
+  res = select(64, NULL, &fdw, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (!FD_ISSET(sockfd, &fdw)) {
+    return;
+  }
+
+  char data[] = "hello from the other siide\n";
+
+  printf("send..\n");
+#if TEST_FILE_OPS
+  res = write(sockfd, data, sizeof(data));
+#else
+  res = send(sockfd, data, sizeof(data), 0);
+#endif
+  if (res == -1) {
+    if (errno != EAGAIN) {
+      perror("send error");
+      finish(EXIT_FAILURE);
+    }
+    return;
+  }
+
+  finish(EXIT_SUCCESS);
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+#if !TEST_DGRAM
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+#else
+  sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+#endif
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+  emscripten_set_main_loop(loop, 0, 0);
+
+  return EXIT_SUCCESS;
+}
+
diff --git a/tests/sockets/test_sockets_bi_side_bigdata.c b/tests/sockets/test_sockets_bi_side_bigdata.c
new file mode 100644
index 00000000..e31029b6
--- /dev/null
+++ b/tests/sockets/test_sockets_bi_side_bigdata.c
@@ -0,0 +1,90 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#include "test_sockets_bigdata.h"
+
+#define EXPECTED_BYTES 5
+
+int sockfd = -1;
+char *data = NULL;
+
+void finish(int result) {
+  close(sockfd);
+  exit(result);
+}
+
+void loop() {
+  fd_set fdw;
+  int res;
+
+  // make sure that sockfd has finished connecting and is ready to write
+  FD_ZERO(&fdw);
+  FD_SET(sockfd, &fdw);
+  res = select(64, NULL, &fdw, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+    return;
+  } else if (!FD_ISSET(sockfd, &fdw)) {
+    return;
+  }
+
+  printf("send..\n");
+
+  res = send(sockfd, data, DATA_SIZE, 0);
+  if (res == -1) {
+    if (errno != EAGAIN) {
+      perror("send error");
+      finish(EXIT_FAILURE);
+    }
+    return;
+  }
+
+  finish(EXIT_SUCCESS);
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+  
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    exit(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  printf("connect..\n");
+
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+  data = generateData();
+
+  emscripten_set_main_loop(loop, 1, 0);
+
+  return EXIT_SUCCESS;
+}
\ No newline at end of file
diff --git a/tests/sockets/test_sockets_bigdata.h b/tests/sockets/test_sockets_bigdata.h
new file mode 100644
index 00000000..17149ad6
--- /dev/null
+++ b/tests/sockets/test_sockets_bigdata.h
@@ -0,0 +1,20 @@
+
+#include <stdlib.h>
+
+#define DATA_SIZE (256*256*2)
+// 1500 fails
+
+char *generateData() {
+  char *ret = malloc(256*256*2);
+  char *curr = ret;
+  for (int i = 0; i < 256; i++) {
+    for (int j = 0; j < 256; j++) {
+      *curr = i;
+      curr++;
+      *curr = j;
+      curr++;
+    }
+  }
+  return ret;
+}
+
diff --git a/tests/sockets/test_sockets_gethostbyname.c b/tests/sockets/test_sockets_gethostbyname.c
new file mode 100644
index 00000000..59c55ba1
--- /dev/null
+++ b/tests/sockets/test_sockets_gethostbyname.c
@@ -0,0 +1,138 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 5
+
+int sockfd;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+unsigned int get_all_buf(int sock, char* output, unsigned int maxsize) {
+  int bytes;
+  if (ioctl(sock, FIONREAD, &bytes)) return 0;
+  if (bytes == 0) return 0;
+
+  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!");
+        finish(EXIT_FAILURE);
+      }
+      memcpy(output+offset, buffer, n);
+      offset += n;
+    }
+  }
+
+  if (n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+    perror("error in get_all_buf!");
+    finish(EXIT_FAILURE);
+  }
+  return offset;
+}
+
+void iter() {
+  static char out[1024*2];
+  static int pos = 0;
+  fd_set fdr;
+  int res;
+
+  // make sure that sockfd has finished connecting and is ready to read
+  FD_ZERO(&fdr);
+  FD_SET(sockfd, &fdr);
+  res = select(64, &fdr, NULL, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (!FD_ISSET(sockfd, &fdr)) {
+    return;
+  }
+
+  // perform read write operations ...
+  int n = get_all_buf(sockfd, 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(sockfd, SHUT_RDWR);
+
+    close(sockfd);
+
+    printf("sum: %d\n", sum);
+
+    finish(sum);
+  }
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  struct hostent *host0 = gethostbyname("test.com"); // increment hostname counter to check for possible but at 0,0 not differentiating low/high
+  struct hostent *host = gethostbyname("localhost");
+  char **raw_addr_list = host->h_addr_list;
+  int *raw_addr = (int*)*raw_addr_list;
+  printf("raw addr: %d\n", *raw_addr);
+  char name[INET_ADDRSTRLEN];
+  if (!inet_ntop(AF_INET, raw_addr, name, sizeof(name))) {
+    printf("could not figure out name\n");
+    finish(EXIT_FAILURE);
+  }
+  printf("localhost has 'ip' of %s\n", name);
+
+  if (inet_pton(AF_INET, name, &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_set_main_loop(iter, 0, 0);
+#else
+  while (1) iter();
+#endif
+
+  return EXIT_SUCCESS;
+}
+
diff --git a/tests/sockets/test_sockets_partial.c b/tests/sockets/test_sockets_partial.c
new file mode 100644
index 00000000..5fe34721
--- /dev/null
+++ b/tests/sockets/test_sockets_partial.c
@@ -0,0 +1,119 @@
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <fcntl.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 sockfd = -1;
+int sum = 0;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+void iter(void *arg) {
+  char buffer[1024];
+  char packetLength;
+  fd_set fdr;
+  int i;
+  int res;
+
+  // make sure that sockfd is ready to read
+  FD_ZERO(&fdr);
+  FD_SET(sockfd, &fdr);
+  res = select(64, &fdr, NULL, NULL, NULL);
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (!FD_ISSET(sockfd, &fdr)) {
+    return;
+  }
+
+  res = recv(sockfd, buffer, 1, 0);
+  if (res == -1) {
+    if (errno == EAGAIN || errno == EWOULDBLOCK) {
+      return; //try again
+    }
+
+    perror("unexcepted end of data");
+    finish(EXIT_FAILURE);
+  }
+
+  if (res != 1) {
+    perror("should read 1 byte");
+    finish(EXIT_FAILURE);
+  }
+
+  packetLength = buffer[0];
+  res = recv(sockfd, buffer, packetLength, 0);
+
+  printf("got %d,%d\n", res, packetLength);
+
+  if (res != packetLength) {
+    fprintf(stderr, "lost packet data, expected: %d readed: %d", packetLength, res);
+    finish(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]);
+      finish(EXIT_FAILURE);
+    }
+
+    sum += buffer[i];
+  }
+
+  if (packetLength == buffer[0]) { // \x01\x01 - end marker
+    printf("sum: %d\n", sum);
+    finish(sum);
+  }
+}
+
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    exit(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_set_main_loop(iter, 0, 0);
+#else
+  while (!done) iter(NULL);
+#endif
+
+  return EXIT_SUCCESS;
+}
+
diff --git a/tests/sockets/test_sockets_select.c b/tests/sockets/test_sockets_select.c
new file mode 100644
index 00000000..e05bd4c8
--- /dev/null
+++ b/tests/sockets/test_sockets_select.c
@@ -0,0 +1,98 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#include <assert.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 5
+
+int sockfd = -1;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+void iter(void *arg) {
+  static int retries = 0;
+
+  fd_set sett;
+  FD_ZERO(&sett);
+  FD_SET(sockfd, &sett);
+  
+  // currently, we've connected to a closed server port.
+  // the initial async connect "succeeded" and select
+  // should say that the socket is ready for a non-blocking
+  // read, however, the read should be 0 sized signalling
+  // that the remote end has closed.
+  int handles = select(64, &sett, NULL, NULL, NULL);
+  if (handles == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  }
+
+  if (FD_ISSET(sockfd, &sett)) {
+    char buffer[1024];
+    int n = recv(sockfd, buffer, sizeof(buffer), 0);
+    if (n == -1 && retries++ > 10) {
+      perror("revv failed");
+      finish(EXIT_FAILURE);
+    } else if (!n) {
+      perror("Connection to websocket server failed as expected.");
+      finish(266);
+    }
+  }
+}
+
+// This is for testing a websocket connection to a closed server port.
+// The connect call will succeed (due to the asynchronous websocket
+// behavior) but once the underlying websocket system realized that 
+// the connection cannot be established, the next select call will fail.
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  // This call should succeed (even if the server port is closed)
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_set_main_loop(iter, 0, 0);
+#else
+  while (1) iter(NULL);
+#endif
+  
+  return EXIT_FAILURE;
+}
+
diff --git a/tests/sockets/test_sockets_select_server_closes_connection.c b/tests/sockets/test_sockets_select_server_closes_connection.c
new file mode 100644
index 00000000..4181b12b
--- /dev/null
+++ b/tests/sockets/test_sockets_select_server_closes_connection.c
@@ -0,0 +1,112 @@
+#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 <fcntl.h>
+#include <sys/ioctl.h>
+#include <assert.h>
+#if EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#define EXPECTED_BYTES 5
+
+int sockfd = -1;
+
+void finish(int result) {
+  close(sockfd);
+#if EMSCRIPTEN
+  REPORT_RESULT();
+#endif
+  exit(result);
+}
+
+void iter(void *arg) {  
+  static char readbuf[1024];
+  static int readPos = 0;
+  
+  fd_set sett;
+  FD_ZERO(&sett);
+  FD_SET(sockfd, &sett);
+  
+  int res = select(64, &sett, NULL, NULL, NULL);
+  
+  if (res == -1) {
+    perror("select failed");
+    finish(EXIT_FAILURE);
+  } else if (res == 0) {
+    return;
+  } else if (res > 0) {
+    assert(FD_ISSET(sockfd, &sett));
+    
+    int bytesRead = recv(sockfd, readbuf+readPos, 7-readPos, 0);
+    if (bytesRead == -1) {
+      if (errno != EAGAIN) {
+        perror("recv error");
+        finish(EXIT_FAILURE);
+      }
+      // try again
+      return;
+    }
+
+    if (readPos < 7) {
+      readPos += bytesRead;
+    } else {
+      if (!bytesRead) {
+        perror("Connection to websocket server was closed as expected");
+        finish(266);
+      } else {
+        perror("Connection to websocket server was not closed");
+        finish(EXIT_FAILURE);
+      }
+    }
+  }
+  
+  return;
+}
+
+// Scenario: the server sends data and closes the connection after 7 bytes. 
+// This test should provoke the situation in which the underlying 
+// tcp connection has been torn down already but there is still data 
+// in the queue. The select call has to succeed as long the queue
+// still contains data and only then start to throw errors.
+int main() {
+  struct sockaddr_in addr;
+  int res;
+
+  sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+  if (sockfd == -1) {
+    perror("cannot create socket");
+    finish(EXIT_FAILURE);
+  }
+  fcntl(sockfd, F_SETFL, O_NONBLOCK);
+
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(SOCKK);
+  if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
+    perror("inet_pton failed");
+    finish(EXIT_FAILURE);
+  }
+
+  // This call should succeed (even if the server port is closed)
+  res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
+  if (res == -1 && errno != EINPROGRESS) {
+    perror("connect failed");
+    finish(EXIT_FAILURE);
+  }
+
+#if EMSCRIPTEN
+  emscripten_set_main_loop(iter, 0, 0);
+#else