When writing to a non-blocking pipe whose buffer is full, this function fails
with @code{errno} being set to @code{ENOSPC} instead of @code{EAGAIN} on some
platforms:
-mingw.
+mingw, MSVC 9.
@end itemize
Portability problems fixed by Gnulib module @code{stdio}, together with module @code{sigpipe}:
@item
When writing to a pipe with no readers, this function fails, instead of
obeying the current @code{SIGPIPE} handler, on some platforms:
-mingw.
+mingw, MSVC 9.
@end itemize
Portability problems not fixed by Gnulib:
@item
On Windows platforms (excluding Cygwin), this function does not set @code{errno}
upon failure.
+@item
+On some platforms, this function does not set @code{errno} or the
+stream error indicator on attempts to write to a read-only stream:
+Cygwin 1.7.9.
+@item
+This function crashes if the stream's file descriptor has already been
+closed, if @code{MSVC_INVALID_PARAMETER_HANDLING} is
+@code{HAIRY_LIBRARY_HANDLING} or @code{SANE_LIBRARY_HANDLING},
+on some platforms:
+MSVC 9.
@end itemize