+# if GNULIB_NONBLOCKING
+ if (errno == ENOSPC)
+ {
+ HANDLE h = (HANDLE) _get_osfhandle (fd);
+ if (GetFileType (h) == FILE_TYPE_PIPE)
+ {
+ /* h is a pipe or socket. */
+ DWORD state;
+ if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL,
+ NULL, 0)
+ && (state & PIPE_NOWAIT) != 0)
+ {
+ /* h is a pipe in non-blocking mode.
+ We can get here in four situations:
+ 1. When the pipe buffer is full.
+ 2. When count <= pipe_buf_size and the number of
+ free bytes in the pipe buffer is < count.
+ 3. When count > pipe_buf_size and the number of free
+ bytes in the pipe buffer is > 0, < pipe_buf_size.
+ 4. When count > pipe_buf_size and the pipe buffer is
+ entirely empty.
+ The cases 1 and 2 are POSIX compliant. In cases 3 and
+ 4 POSIX specifies that write() must split the request
+ and succeed with a partial write. We fix case 4.
+ We don't fix case 3 because it is not essential for
+ programs. */
+ DWORD out_size; /* size of the buffer for outgoing data */
+ DWORD in_size; /* size of the buffer for incoming data */
+ if (GetNamedPipeInfo (h, NULL, &out_size, &in_size, NULL))
+ {
+ size_t reduced_count = count;
+ /* In theory we need only one of out_size, in_size.
+ But I don't know which of the two. The description
+ is ambiguous. */
+ if (out_size != 0 && out_size < reduced_count)
+ reduced_count = out_size;
+ if (in_size != 0 && in_size < reduced_count)
+ reduced_count = in_size;
+ if (reduced_count < count)
+ {
+ /* Attempt to write only the first part. */
+ count = reduced_count;
+ continue;
+ }
+ }
+ /* Change errno from ENOSPC to EAGAIN. */
+ errno = EAGAIN;
+ }
+ }
+ }
+ else
+# endif
+ {
+# if GNULIB_SIGPIPE
+ if (GetLastError () == ERROR_NO_DATA
+ && GetFileType ((HANDLE) _get_osfhandle (fd))
+ == FILE_TYPE_PIPE)
+ {
+ /* Try to raise signal SIGPIPE. */
+ raise (SIGPIPE);
+ /* If it is currently blocked or ignored, change errno from
+ EINVAL to EPIPE. */
+ errno = EPIPE;
+ }
+# endif
+ }