emacs-28 e8d2f40f41: Clean up the MSDOS port

[Eli Zaretskii]

branch: emacs-28
commit e8d2f40f41b09ec5e4b4eebe6441927e8d1dc434
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Clean up the MSDOS port
    
    * src/msdos.h (tcdrain): Redirect to '_dos_commit'.
    (openat, fchmodat, futimens, utimensat): Add prototypes.
    
    * msdos/sed1v2.inp (MAKE_PDUMPER_FINGERPRINT): Fix indentation, so
    that Make won't consider this line a command.
    ($(etc)/DOC): Chdir back to ../src, since "make-docfile -d" leaves
    us in a wrong directory.
    * msdos/sedlibmk.inp (GL_GNULIB_GETRANDOM, GL_GNULIB_MEMMEM)
    (GL_GNULIB_SIGDESCR_NP): Define to 1, to get the prototypes from
    Gnulib headers.
---
 msdos/sed1v2.inp   | 8 +++++++-
 msdos/sedlibmk.inp | 3 +++
 src/msdos.h        | 9 +++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/msdos/sed1v2.inp b/msdos/sed1v2.inp
index e041e4e5b8..a79bf2eb71 100644
--- a/msdos/sed1v2.inp
+++ b/msdos/sed1v2.inp
@@ -179,6 +179,8 @@ s/ *@LIBXPM@//
 /^PAXCTL_dumped *=/s/=.*$/=/
 /^PAXCTL_notdumped *=/s/=.*$/=/
 /^DUMPING *=/s/@DUMPING@/unexec/
+/^[ \t]*MAKE_PDUMPER_FINGERPRINT = *$/c\
+MAKE_PDUMPER_FINGERPRINT =
 /^lisp\.mk:/,/^$/c\
 lisp.mk: $(lispsource)/loadup.el\
        @rm -f $@\
@@ -190,6 +192,10 @@ lisp.mk: $(lispsource)/loadup.el\
 
 /^     [       ]*\$(AM_V_at)\$(libsrc)\/make-docfile 
-d/s!make-docfile!make-docfile -o $(etc)/DOC!
 / > \$(etc)\/DOC *$/s/ >.*$//
+/^\$(etc)\/DOC/,/^$/{
+  /^$/i\
+       cd ../src
+}
 /^     [       
]*\$(AM_V_GLOBALS)\$(libsrc)\/make-docfile.*>.*globals.tmp/s!make-docfile!make-docfile
 -o globals.tmp!
 /^     [       ]*\$(AM_V_GLOBALS)\$(libsrc)\/make-doc/s!>.*$!!
 /^\$(libsrc)\/make-docfile\$(EXEEXT): /i\
@@ -255,4 +261,4 @@ s| -I\$(top_srcdir)/lib||
 s| -I\. -I\$(srcdir)| -I.|
 /^      *test "X/d
 /\$(CC) -o \$@.tmp/s/\$@.tmp/\$@/
-/mv \$@.tmp \$@/d
\ No newline at end of file
+/mv \$@.tmp \$@/d
diff --git a/msdos/sedlibmk.inp b/msdos/sedlibmk.inp
index 59ebec9e75..e87cef5fff 100644
--- a/msdos/sedlibmk.inp
+++ b/msdos/sedlibmk.inp
@@ -180,11 +180,14 @@ s/@PACKAGE@/emacs/
 /^GL_GNULIB_ENVIRON *=/s/@GL_GNULIB_ENVIRON@/1/
 /^GL_GNULIB_FDATASYNC *=/s/@GL_GNULIB_FDATASYNC@/1/
 /^GL_GNULIB_GETLOADAVG *=/s/@GL_GNULIB_GETLOADAVG@/1/
+/^GL_GNULIB_GETRANDOM *=/s/@GL_GNULIB_GETRANDOM@/1/
 /^GL_GNULIB_UNISTD_H_GETOPT *=/s/@GL_GNULIB_UNISTD_H_GETOPT@/1/
+/^GL_GNULIB_MEMMEM *=/s/@GL_GNULIB_MEMMEM@/1/
 /^GL_GNULIB_MEMRCHR *=/s/@GL_GNULIB_MEMRCHR@/1/
 /^GL_GNULIB_MEMPCPY *=/s/@GL_GNULIB_MEMPCPY@/1/
 /^GL_GNULIB_MKOSTEMP *=/s/@GL_GNULIB_MKOSTEMP@/1/
 /^GL_GNULIB_MKTIME *=/s/@GL_GNULIB_MKTIME@/1/
+/^GL_GNULIB_SIGDESCR_NP *=/s/@GL_GNULIB_SIGDESCR_NP@/1/
 /^GL_GNULIB_TIME_R *=/s/@GL_GNULIB_TIME_R@/1/
 /^GL_GNULIB_TIMEGM *=/s/@GL_GNULIB_TIMEGM@/1/
 /^GL_GNULIB_TIME_RZ *=/s/@GL_GNULIB_TIME_RZ@/1/
diff --git a/src/msdos.h b/src/msdos.h
index 7e57c7c110..24697bcf24 100644
--- a/src/msdos.h
+++ b/src/msdos.h
@@ -22,6 +22,10 @@ along with GNU Emacs.  If not, see 
<https://www.gnu.org/licenses/>.  */
 #include <dpmi.h>
 
 #include "termhooks.h"         /* struct terminal */
+struct terminal;
+
+extern unsigned int _dos_commit(int);
+#define tcdrain(f) _dos_commit(f)
 
 int dos_ttraw (struct tty_display_info *);
 int dos_ttcooked (void);
@@ -57,6 +61,11 @@ ssize_t readlinkat (int, const char *, char *, size_t);
 int fstatat (int, char const *, struct stat *, int);
 int unsetenv (const char *);
 int faccessat (int, const char *, int, int);
+int openat (int, const char *, int, int);
+int fchmodat (int, const char *, mode_t, int);
+int futimens (int, const struct timespec[2]);
+int utimensat (int, const char *, const struct timespec[2], int);
+
 void msdos_fatal_signal (int);
 void syms_of_msdos (void);
 int pthread_sigmask (int, const sigset_t *, sigset_t *);