X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fsrc%2Fdeliver.c;h=de552f4cc0931642af59e2c227b878aa51111714;hb=4783307727d83aee3cd8d746618dce5266188e0f;hp=b036a846afe4eef11968c9054e4b631d20567b83;hpb=c29da374ab4ea587c810bdc0395443d6b6164fea;p=user%2Fhenk%2Fcode%2Fexim.git

diff --git a/src/src/deliver.c b/src/src/deliver.c
index b036a846a..de552f4cc 100644
--- a/src/src/deliver.c
+++ b/src/src/deliver.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2017 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* The main code for delivering a message. */
@@ -80,6 +80,52 @@ static uschar *used_return_path = NULL;
 
 
 
+/*************************************************
+*          read as much as requested             *
+*************************************************/
+
+/* The syscall read(2) doesn't always returns as much as we want. For
+several reasons it might get less. (Not talking about signals, as syscalls
+are restartable). When reading from a network or pipe connection the sender
+might send in smaller chunks, with delays between these chunks. The read(2)
+may return such a chunk.
+
+The more the writer writes and the smaller the pipe between write and read is,
+the more we get the chance of reading leass than requested. (See bug 2130)
+
+This function read(2)s until we got all the data we *requested*.
+
+Note: This function may block. Use it only if you're sure about the
+amount of data you will get.
+
+Argument:
+  fd          the file descriptor to read from
+  buffer      pointer to a buffer of size len
+  len         the requested(!) amount of bytes
+
+Returns:      the amount of bytes read
+*/
+static ssize_t
+readn(int fd, void * buffer, size_t len)
+{
+  void * next = buffer;
+  void * end = buffer + len;
+
+  while (next < end)
+    {
+    ssize_t got = read(fd, next, end - next);
+
+    /* I'm not sure if there are signals that can interrupt us,
+    for now I assume the worst */
+    if (got == -1 && errno == EINTR) continue;
+    if (got <= 0) return next - buffer;
+    next += got;
+    }
+
+  return len;
+}
+
+
 /*************************************************
 *             Make a new address item            *
 *************************************************/
@@ -3312,8 +3358,7 @@ while (!done)
   If we get less, we can assume the subprocess do be done and do not expect any further
   information from it. */
 
-  got = readn(fd, pipeheader, required);
-  if (got != required)
+  if ((got = readn(fd, pipeheader, required)) != required)
     {
     msg = string_sprintf("got " SSIZE_T_FMT " of %d bytes (pipeheader) "
       "from transport process %d for transport %s",
@@ -3349,8 +3394,7 @@ while (!done)
   /* Same as above, the transport process will write the bytes announced
   in a timely manner, so we can just wait for the bytes, getting less than expected
   is considered a problem of the subprocess, we do not expect anything else from it. */
-  got = readn(fd, big_buffer, required);
-  if (got != required)
+  if ((got = readn(fd, big_buffer, required)) != required)
     {
     msg = string_sprintf("got only " SSIZE_T_FMT " of " SIZE_T_FMT
       " bytes (pipedata) from transport process %d for transport %s",
@@ -8508,13 +8552,12 @@ if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
 
     else if (pid == 0)		/* child: fork again to totally disconnect */
       {
-      close(pfd[1]);
-      if ((pid = fork()))
-	_exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
-      smtp_proxy_tls(big_buffer, big_buffer_size, pfd[0], 5*60);
-      exim_exit(0);
+      if (running_in_test_harness) millisleep(100); /* let parent debug out */
+      /* does not return */
+      smtp_proxy_tls(big_buffer, big_buffer_size, pfd, 5*60);
       }
 
+    DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
     close(pfd[0]);
     waitpid(pid, NULL, 0);
     (void) close(channel_fd);	/* release the client socket */