Fix the DJGPP port

* config.bat:
* msdos/sed1v2.inp:
* msdos/sed2v2.inp:
* msdos/sed3v2.inp:
* msdos/sedlibmk.inp: Update for Emacs 28.
* msdos/langinfo.h: New file.

* lisp/loadup.el: Use correct path to temacs when dumping on
MS-DOS.
* src/callproc.c (environ) [MSDOS]: New declaration.
(child_setup, emacs_spawn): Update MS-DOS parts for Emacs 28.
* src/fileio.c (Fcopy_file): Don't use copy_file_range on
MS-DOS.
* src/msdos.c (initialize_msdos_display): Add
`defined_color_hook'.
(openat, fchmodat, futimens, utimensat): New functions.

* src/msdos.h (FRAME_X_DISPLAY): New macro.
* src/process.c: Make some more things conditional on
subprocess support.
(PIPECONN_P, PIPECONN1_P) [!subprocesses]: New placeholder
macros.
(Fnum_processors): Return 1 on MSDOS.
(open_channel_for_module): Avoid subprocess specific code
on MSDOS.

1 files changed, 14 insertions, 3 deletions

diff --git a/src/process.c b/src/process.c
index 6731f8808f5..75ba191fa10 100644
--- a/src/process.c
+++ b/src/process.c
@@ -40,7 +40,10 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
-#endif  /* subprocesses */
+#else
+#define PIPECONN_P(p) false
+#define PIPECONN1_P(p) false
+#endif
 
 #ifdef HAVE_SETRLIMIT
 # include <sys/resource.h>
@@ -152,6 +155,7 @@ static bool kbd_is_on_hold;
    when exiting.  */
 bool inhibit_sentinels;
 
+#ifdef subprocesses
 union u_sockaddr
 {
   struct sockaddr sa;
@@ -164,8 +168,6 @@ union u_sockaddr
 #endif
 };
 
-#ifdef subprocesses
-
 #ifndef SOCK_CLOEXEC
 # define SOCK_CLOEXEC 0
 #endif
@@ -8238,9 +8240,13 @@ If optional argument QUERY is `current', ignore OMP_NUM_THREADS.
 If QUERY is `all', also count processors not available.  */)
   (Lisp_Object query)
 {
+#ifndef MSDOS
   return make_uint (num_processors (EQ (query, Qall) ? NPROC_ALL
                                     : EQ (query, Qcurrent) ? NPROC_CURRENT
                                     : NPROC_CURRENT_OVERRIDABLE));
+#else
+  return make_fixnum (1);
+#endif
 }
 
 #ifdef subprocesses
@@ -8285,10 +8291,15 @@ open_channel_for_module (Lisp_Object process)
 {
   CHECK_PROCESS (process);
   CHECK_TYPE (PIPECONN_P (process), Qpipe_process_p, process);
+#ifndef MSDOS
   int fd = dup (XPROCESS (process)->open_fd[SUBPROCESS_STDOUT]);
   if (fd == -1)
     report_file_error ("Cannot duplicate file descriptor", Qnil);
   return fd;
+#else
+  /* PIPECONN_P returning true shouldn't be possible on MSDOS.  */
+  emacs_abort ();
+#endif
 }