From e396824ed2d6514a62302c5e5591cacfbb8cd29b Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Sun, 6 Mar 2016 16:36:58 -0800
Subject: Special implementation of dgram socket streams.

* socket.c (struct dgram_stream): New struct.
(make_dgram_sock_stream, dgram_print, dgram_mark,
dgram_destroy, dgram_overflow, dgram_put_byte_callback,
dgram_put_string, dgram_put_char, dgram_put_byte,
dgram_get_byte_callback, dgram_get_char, dgram_get_byte,
dgram_unget_char, dgram_unget_byte, dgram_flush, dgram_close,
dgram_get_prop, dgram_get_fd, dgram_get_sock_family,
dgram_get_sock_type, dgram_get_sock_peer,
dgram_set_sock_peer, dgram_get_error, dgram_get_error_str,
dgram_clear_error): New static functions.
(dgram_strm_ops): New static structure.
(sock_listen): Check against datagram sockets which have
a peer; otherwise a no-op for datagram sockets.
(sock_accept): Special logic for dgram sockets.
(open_sockfd): Function moved here from stream.c, and
augmented to open dgram stream for dgram sockets.
(open_socket): Function moved here from stream.c.
(sock_load_init): Fill in some operations in dgram_strm_ops.

* stream.c (generic_get_line, make_sock_stream,
errno_to_string): Statics become external.
(open_sockfd, open_socket): Functions removed from here,
moved to socket.c.

* stream.h (generic_get_line, make_sock_stream,
errno_to_string): Declared.
---
 socket.c | 516 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 stream.c |  35 +----
 stream.h |   3 +
 3 files changed, 494 insertions(+), 60 deletions(-)

diff --git a/socket.c b/socket.c
index 49b531a8..e4bbb61f 100644
--- a/socket.c
+++ b/socket.c
@@ -33,9 +33,10 @@
 #include <signal.h>
 #include <dirent.h>
 #include <errno.h>
-#include "config.h"
+#include <unistd.h>
 #include <sys/un.h>
 #include <netdb.h>
+#include "config.h"
 #include ALLOCA_H
 #include "lib.h"
 #include "stream.h"
@@ -49,6 +50,23 @@
 #include "arith.h"
 #include "socket.h"
 
+struct dgram_stream {
+  struct strm_base a;
+  val stream;
+  val family;
+  val peer;
+  val unget_c;
+  utf8_decoder_t ud;
+  struct sockaddr_storage peer_addr;
+  socklen_t pa_len;
+  int fd;
+  int err;
+  mem_t *rx_buf;
+  mem_t *tx_buf;
+  int rx_size, rx_pos;
+  int tx_pos;
+};
+
 val sockaddr_in_s, sockaddr_in6_s, sockaddr_un_s, addrinfo_s;
 val flags_s, family_s, socktype_s, protocol_s, addr_s, canonname_s;
 val port_s, flow_info_s, scope_id_s, path_s;
@@ -91,7 +109,6 @@ static void ipv6_scope_id_from_num(struct sockaddr_in6 *dst, val scope)
               scope, nao);
 }
 
-
 static val sockaddr_in_out(struct sockaddr_in *src)
 {
   args_decl(args, ARGS_MIN);
@@ -235,6 +252,347 @@ static void sockaddr_in(val sockaddr, val family,
   }
 }
 
+static_forward(struct strm_ops dgram_strm_ops);
+
+static val make_dgram_sock_stream(int fd, val family, val peer,
+                                  mem_t *dgram, int dgram_size,
+                                  struct sockaddr *peer_addr, socklen_t pa_len)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *,
+                                  chk_malloc(sizeof *d));
+  val stream;
+
+  strm_base_init(&d->a);
+  d->stream = nil;
+  d->fd = fd;
+  d->family = d->peer = d->unget_c = nil;
+  d->err = 0;
+  d->rx_buf = dgram;
+  d->rx_size = dgram_size;
+  d->rx_pos = 0;
+  d->tx_buf = 0;
+  d->tx_pos = 0;
+  utf8_decoder_init(&d->ud);
+  if (peer_addr != 0)
+    memcpy(&d->peer_addr, peer_addr, pa_len);
+  d->pa_len = pa_len;
+  stream = cobj(coerce(mem_t *, d), stream_s, &dgram_strm_ops.cobj_ops);
+  d->stream = stream;
+  d->family = family;
+  d->peer = peer;
+  return stream;
+}
+
+static void dgram_print(val stream, val out, val pretty)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  struct strm_ops *ops = coerce(struct strm_ops *, stream->co.ops);
+  val name = static_str(ops->name);
+
+  (void) pretty;
+
+  format(out, lit("#<~a ~s ~p>"), name, num(d->fd), stream, nao);
+}
+
+static void dgram_mark(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  strm_base_mark(&d->a);
+  /* h->stream == stream and so no need to mark h->stream */
+  gc_mark(d->family);
+  gc_mark(d->peer);
+  gc_mark(d->unget_c);
+}
+
+static void dgram_destroy(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  free(d->rx_buf);
+  free(d->tx_buf);
+  d->rx_buf = d->tx_buf = 0;
+}
+
+static void dgram_overflow(val stream)
+{
+  /*
+   * Not called under present logic, because dgram_put_byte_callback keeps
+   * increasing the datagram size.
+   */
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  d->err = ENOBUFS;
+  uw_throwf(socket_error_s, lit("dgram write overflow on ~s"), stream, nao);
+}
+
+static int dgram_put_byte_callback(int b, mem_t *ctx)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, ctx);
+  d->tx_buf = chk_manage_vec(d->tx_buf, d->tx_pos, d->tx_pos + 1, 1, 0);
+  d->tx_buf[d->tx_pos++] = b;
+  return 1;
+}
+
+static val dgram_put_string(val stream, val str)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  const wchar_t *s = c_str(str);
+
+  while (*s) {
+    if (!utf8_encode(*s++, dgram_put_byte_callback, coerce(mem_t *, d)))
+      dgram_overflow(stream);
+  }
+
+  return t;
+}
+
+static val dgram_put_char(val stream, val ch)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  if (!utf8_encode(c_chr(ch), dgram_put_byte_callback, coerce(mem_t *, d)))
+    dgram_overflow(stream);
+  return t;
+}
+
+static val dgram_put_byte(val stream, int b)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  if (!dgram_put_byte_callback(b, coerce(mem_t *, d)))
+    dgram_overflow(stream);
+  return t;
+}
+
+static int dgram_get_byte_callback(mem_t *ctx)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, ctx);
+  if (d->rx_buf) {
+    return (d->rx_pos < d->rx_size) ? d->rx_buf[d->rx_pos++] : EOF;
+  } else {
+    const int dgram_size = 65536;
+    mem_t *dgram = chk_malloc(dgram_size);
+    ssize_t nbytes = -1;
+
+    uw_simple_catch_begin;
+
+    sig_save_enable;
+
+    nbytes = recv(d->fd, dgram, dgram_size, 0);
+
+    sig_restore_enable;
+
+    if (nbytes == -1) {
+      d->err = errno;
+      uw_throwf(socket_error_s,
+                lit("get-byte: recv on ~s failed: ~d/~s"),
+                  d->stream, num(errno), string_utf8(strerror(errno)), nao);
+    }
+
+    uw_unwind {
+      if (nbytes == -1)
+        free(dgram);
+    }
+
+    uw_catch_end;
+
+    d->rx_buf = chk_realloc(dgram, nbytes);
+
+    if (!d->rx_buf)
+      d->rx_buf = dgram;
+
+    d->rx_size = nbytes;
+
+    return dgram_get_byte_callback(ctx);
+  }
+}
+
+static val dgram_get_char(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  val uc = d->unget_c;
+  if (uc) {
+    d->unget_c = nil;
+    return uc;
+  } else {
+    wint_t ch = utf8_decode(&d->ud, dgram_get_byte_callback,
+                            coerce(mem_t *, d));
+    return (ch != WEOF) ? chr(ch) : nil;
+  }
+}
+
+static val dgram_get_byte(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  int b = dgram_get_byte_callback(coerce(mem_t *, d));
+  return b == EOF ? nil : num_fast(b);
+}
+
+static val dgram_unget_char(val stream, val ch)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+
+  if (d->unget_c){
+    d->err = EOVERFLOW;
+    uw_throwf(file_error_s, lit("unget-char overflow on ~a: "), stream, nao);
+  }
+
+  d->unget_c = ch;
+  return ch;
+}
+
+static val dgram_unget_byte(val stream, int byte)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+
+  if (d->rx_pos <= 0) {
+    d->err = EOVERFLOW;
+    uw_throwf(file_error_s,
+              lit("unget-byte: cannot push back past start of stream ~s"),
+              stream, nao);
+  }
+
+  d->rx_buf[--d->rx_pos] = byte;
+  return num_fast(byte);
+}
+
+static val dgram_flush(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  if (d->fd != -1 && d->tx_buf) {
+    if (d->peer) {
+      int nwrit = sendto(d->fd, d->tx_buf, d->tx_pos, 0,
+                         coerce(struct sockaddr *, &d->peer_addr), d->pa_len);
+
+      if (nwrit != d->tx_pos) {
+        d->err = (nwrit < 0) ? errno : ENOBUFS;
+        uw_throwf(socket_error_s,
+                  lit("flush-stream: sendto on ~s ~a: ~d/~s"),
+                  stream,
+                  (nwrit < 0) ? lit("failed") : lit("truncated"),
+                  num(errno), string_utf8(strerror(errno)), nao);
+      }
+
+      free(d->tx_buf);
+      d->tx_buf = 0;
+      d->tx_pos = 0;
+    } else {
+      d->err = ENOTCONN;
+      uw_throwf(socket_error_s,
+                lit("flush-stream: cannot transmit on ~s: peer not set"),
+                stream, nao);
+    }
+  }
+  return t;
+}
+
+static val dgram_close(val stream, val throw_on_error)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  if (d->fd != -1) {
+    dgram_flush(stream);
+    close(d->fd);
+    d->fd = -1;
+    d->err = 0;
+  }
+
+  return t;
+}
+
+static val dgram_get_prop(val stream, val ind)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+
+  if (ind == fd_k)
+    return num(d->fd);
+
+  return nil;
+}
+
+static val dgram_get_error(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  if (d->err)
+    return num(d->err);
+  if (d->rx_buf && d->rx_pos == d->rx_size)
+    return t;
+  return nil;
+}
+
+static val dgram_get_error_str(val stream)
+{
+  return errno_to_string(dgram_get_error(stream));
+}
+
+static val dgram_clear_error(val stream)
+{
+  val ret = dgram_get_error(stream);
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+
+  d->err = 0;
+
+  if (d->rx_pos == d->rx_size) {
+    d->rx_pos = d->rx_size = 0;
+    free(d->rx_buf);
+    d->rx_buf = 0;
+  }
+
+  return ret;
+}
+
+static val dgram_get_fd(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  return num(d->fd);
+}
+
+static val dgram_get_sock_family(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  return d->family;
+}
+
+static val dgram_get_sock_type(val stream)
+{
+  (void) stream;
+  return num_fast(SOCK_DGRAM);
+}
+
+static val dgram_get_sock_peer(val stream)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  return d->peer;
+}
+
+static val dgram_set_sock_peer(val stream, val peer)
+{
+  struct dgram_stream *d = coerce(struct dgram_stream *, stream->co.handle);
+  sockaddr_in(peer, d->family, &d->peer_addr, &d->pa_len);
+  return d->peer = peer;
+}
+
+static_def(struct strm_ops dgram_strm_ops =
+  strm_ops_init(cobj_ops_init(eq,
+                              dgram_print,
+                              dgram_destroy,
+                              dgram_mark,
+                              cobj_hash_op),
+                wli("dgram-stream"),
+                dgram_put_string,
+                dgram_put_char,
+                dgram_put_byte,
+                generic_get_line,
+                dgram_get_char,
+                dgram_get_byte,
+                dgram_unget_char,
+                dgram_unget_byte,
+                dgram_close,
+                dgram_flush,
+                0,
+                0,
+                dgram_get_prop,
+                0,
+                dgram_get_error,
+                dgram_get_error_str,
+                dgram_clear_error,
+                dgram_get_fd));
+
 static val sock_bind(val sock, val sockaddr)
 {
   int sfd = c_num(stream_fd(sock));
@@ -274,49 +632,119 @@ static val sock_connect(val sock, val sockaddr)
 
 static val sock_listen(val sock, val backlog)
 {
-  val sfd = stream_fd(sock);
+  if (sock_type(sock) == num_fast(SOCK_DGRAM)) {
+    if (sock_peer(sock)) {
+      errno = EISCONN;
+      goto failed;
+    }
+  } else {
+    val sfd = stream_fd(sock);
 
-  if (listen(c_num(sfd), c_num(default_arg(backlog, num_fast(16)))))
-    uw_throwf(socket_error_s, lit("sock-listen failed: ~d/~s"),
-              num(errno), string_utf8(strerror(errno)), nao);
+    if (listen(c_num(sfd), c_num(default_arg(backlog, num_fast(16)))))
+      goto failed;
+  }
 
   return t;
+failed:
+    uw_throwf(socket_error_s, lit("sock-listen failed: ~d/~s"),
+              num(errno), string_utf8(strerror(errno)), nao);
 }
 
 static val sock_accept(val sock, val mode_str)
 {
   val sfd = stream_fd(sock);
   val family = sock_family(sock);
+  val type = sock_type(sock);
   struct sockaddr_storage sa;
   socklen_t salen;
-  int afd;
-  val peer;
+  val peer = nil;
+
+  if (type == num_fast(SOCK_DGRAM)) {
+    ssize_t nbytes = -1;
+    const int dgram_size = 65536;
+    mem_t *dgram = chk_malloc(dgram_size);
 
-  sig_save_enable;
+    if (sock_peer(sock)) {
+      free(dgram);
+      errno = EISCONN;
+      goto failed;
+    }
 
-  afd = accept(c_num(sfd), coerce(struct sockaddr *, &sa), &salen);
+    uw_simple_catch_begin;
 
-  sig_restore_enable;
+    sig_save_enable;
 
-  if (afd < 0)
-    uw_throwf(socket_error_s, lit("accept failed: ~d/~s"),
-              num(errno), string_utf8(strerror(errno)), nao);
+    nbytes = recvfrom(c_num(sfd), dgram, dgram_size, 0,
+                      coerce(struct sockaddr *, &sa), &salen);
+
+    sig_restore_enable;
+
+    if (family == num_fast(AF_INET))
+      peer = sockaddr_in_out(coerce(struct sockaddr_in *, &sa));
+    else if (family == num_fast(AF_INET6))
+      peer = sockaddr_in6_out(coerce(struct sockaddr_in6 *, &sa));
+    else if (family == num_fast(AF_UNIX))
+      peer = unix_sockaddr_out(coerce(struct sockaddr_un *, &sa));
+    else {
+      free(dgram);
+      dgram = 0;
+      uw_throwf(socket_error_s, lit("sock-accept: ~s isn't a supported socket family"),
+                family, nao);
+    }
 
-  if (family == num_fast(AF_INET))
-    peer = sockaddr_in_out(coerce(struct sockaddr_in *, &sa));
-  else if (family == num_fast(AF_INET6))
-    peer = sockaddr_in6_out(coerce(struct sockaddr_in6 *, &sa));
-  else if (family == num_fast(AF_UNIX))
-    peer = unix_sockaddr_out(coerce(struct sockaddr_un *, &sa));
-  else
-    uw_throwf(socket_error_s, lit("accept: ~s isn't a supported socket family"),
-              family, nao);
-
-  {
-    val stream = open_sockfd(num(afd), family, num_fast(SOCK_STREAM), mode_str);
-    sock_set_peer(stream, peer);
-    return stream;
+    uw_unwind {
+      if (nbytes == -1)
+        free(dgram);
+    }
+
+    uw_catch_end;
+
+    {
+      int afd = dup(c_num(sfd));
+      mem_t *shrink = chk_realloc(dgram, nbytes);
+      if (shrink)
+        dgram = shrink;
+
+      if (afd == -1) {
+        free(dgram);
+        dgram = 0;
+        uw_throwf(socket_error_s, lit("sock-accept: unable to "),
+                family, nao);
+      }
+
+      return make_dgram_sock_stream(afd, family, peer, dgram, nbytes,
+                                    coerce(struct sockaddr *, &sa), salen);
+    }
+  } else {
+    int afd = -1;
+    sig_save_enable;
+
+    afd = accept(c_num(sfd), coerce(struct sockaddr *, &sa), &salen);
+
+    sig_restore_enable;
+
+    if (afd < 0)
+      goto failed;
+
+    if (family == num_fast(AF_INET))
+      peer = sockaddr_in_out(coerce(struct sockaddr_in *, &sa));
+    else if (family == num_fast(AF_INET6))
+      peer = sockaddr_in6_out(coerce(struct sockaddr_in6 *, &sa));
+    else if (family == num_fast(AF_UNIX))
+      peer = unix_sockaddr_out(coerce(struct sockaddr_un *, &sa));
+    else
+      uw_throwf(socket_error_s, lit("accept: ~s isn't a supported socket family"),
+                family, nao);
+
+    {
+      val stream = open_sockfd(num(afd), family, num_fast(SOCK_STREAM), mode_str);
+      sock_set_peer(stream, peer);
+      return stream;
+    }
   }
+failed:
+  uw_throwf(socket_error_s, lit("accept failed: ~d/~s"),
+            num(errno), string_utf8(strerror(errno)), nao);
 }
 
 static val sock_shutdown(val sock, val how)
@@ -332,6 +760,32 @@ static val sock_shutdown(val sock, val how)
   return t;
 }
 
+val open_sockfd(val fd, val family, val type, val mode_str_in)
+{
+  if (type == num_fast(SOCK_DGRAM)) {
+    return make_dgram_sock_stream(c_num(fd), family, nil, 0, 0, 0, 0);
+  } else {
+    struct stdio_mode m;
+    val mode_str = default_arg(mode_str_in, lit("r+"));
+    FILE *f = (errno = 0, w_fdopen(c_num(fd), c_str(normalize_mode(&m, mode_str))));
+
+    if (!f) {
+      close(c_num(fd));
+      uw_throwf(file_error_s, lit("error creating stream for socket ~a: ~d/~s"),
+                fd, num(errno), string_utf8(strerror(errno)), nao);
+    }
+
+    setvbuf(f, (char *) NULL, _IOLBF, 0);
+    return set_mode_props(m, make_sock_stream(f, family, type));
+  }
+}
+
+val open_socket(val family, val type, val mode_str)
+{
+  int fd = socket(c_num(family), c_num(type), 0);
+  return open_sockfd(num(fd), family, type, mode_str);
+}
+
 void sock_load_init(void)
 {
   sockaddr_in_s = intern(lit("sockaddr-in"), user_package);
@@ -384,4 +838,10 @@ void sock_load_init(void)
   reg_fun(intern(lit("sock-listen"), user_package), func_n2o(sock_listen, 1));
   reg_fun(intern(lit("sock-accept"), user_package), func_n2o(sock_accept, 1));
   reg_fun(intern(lit("sock-shutdown"), user_package), func_n2o(sock_shutdown, 1));
+
+  fill_stream_ops(&dgram_strm_ops);
+  dgram_strm_ops.get_sock_family = dgram_get_sock_family;
+  dgram_strm_ops.get_sock_type = dgram_get_sock_type;
+  dgram_strm_ops.get_sock_peer = dgram_get_sock_peer;
+  dgram_strm_ops.set_sock_peer = dgram_set_sock_peer;
 }
diff --git a/stream.c b/stream.c
index cbb6821a..df1faa2d 100644
--- a/stream.c
+++ b/stream.c
@@ -406,7 +406,7 @@ static void stdio_stream_mark(val stream)
 #endif
 }
 
-static val errno_to_string(val err)
+val errno_to_string(val err)
 {
   if (err == zero)
     return lit("unspecified error");
@@ -608,7 +608,7 @@ static val stdio_get_fd(val stream)
   return h->f ? num(fileno(h->f)) : nil;
 }
 
-static val generic_get_line(val stream)
+val generic_get_line(val stream)
 {
   struct strm_ops *ops = coerce(struct strm_ops *, cobj_ops(stream, stream_s));
   const size_t min_size = 512;
@@ -1233,7 +1233,7 @@ val make_pipe_stream(FILE *f, val descr)
 }
 
 #if HAVE_SOCKETS
-static val make_sock_stream(FILE *f, val family, val type)
+val make_sock_stream(FILE *f, val family, val type)
 {
   val s = make_stdio_stream_common(f, lit("socket"), &stdio_sock_ops.cobj_ops);
   struct stdio_handle *h = coerce(struct stdio_handle *, s->co.handle);
@@ -3249,35 +3249,6 @@ val open_fileno(val fd, val mode_str)
                                                        fd, nao)));
 }
 
-#if HAVE_SOCKETS
-val open_sockfd(val fd, val family, val type, val mode_str_in)
-{
-  struct stdio_mode m;
-  val mode_str = default_arg(mode_str_in, lit("r+"));
-  FILE *f = (errno = 0, w_fdopen(c_num(fd), c_str(normalize_mode(&m, mode_str))));
-
-  if (!f) {
-    close(c_num(fd));
-    uw_throwf(file_error_s, lit("error creating stream for socket ~a: ~d/~s"),
-              fd, num(errno), string_utf8(strerror(errno)), nao);
-  }
-
-  if (type == num_fast(SOCK_DGRAM))
-    setvbuf(f, (char *) NULL, _IOFBF, 65536);
-  else
-    setvbuf(f, (char *) NULL, _IOLBF, 0);
-
-  return set_mode_props(m, make_sock_stream(f, family, type));
-}
-
-val open_socket(val family, val type, val mode_str)
-{
-  int fd = socket(c_num(family), c_num(type), 0);
-  return open_sockfd(num(fd), family, type, mode_str);
-}
-#endif
-
-
 val open_tail(val path, val mode_str, val seek_end_p)
 {
   struct stdio_mode m;
diff --git a/stream.h b/stream.h
index c874d96e..011fcb38 100644
--- a/stream.h
+++ b/stream.h
@@ -125,12 +125,15 @@ void stream_mark_op(val stream);
 void stream_destroy_op(val stream);
 val normalize_mode(struct stdio_mode *m, val mode_str);
 val set_mode_props(const struct stdio_mode m, val stream);
+val generic_get_line(val stream);
+val errno_to_string(val err);
 val make_null_stream(void);
 val make_stdio_stream(FILE *, val descr);
 val make_tail_stream(FILE *, val descr);
 val make_pipe_stream(FILE *, val descr);
 val stream_fd(val stream);
 #if HAVE_SOCKETS
+val make_sock_stream(FILE *f, val family, val type);
 val sock_family(val stream);
 val sock_type(val stream);
 val sock_peer(val stream);
-- 
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