turkdevops · pull · Sep 28, 2026 · Sep 26, 2026 · Sep 27, 2026 · Sep 27, 2026
diff --git a/.gitignore b/.gitignore
@@ -72,15 +72,13 @@ lcov*.info
 /ChangeLog
 /Doxyfile
 /GNUmakefile
-/README.atheos
 /README.fat-patch
 /README.v6
 /TAGS
 /archive
 /autom4te*.cache
 /automake
 /benchmark/benchmark-driver
-/beos
 /bmlog-*
 /breakpoints.gdb
 /config.cache
@@ -128,7 +126,6 @@ lcov*.info
 /revision.h
 /revision.tmp
 /ripper.tmp.y
-/riscos
 /rubicon
 /ruby
 /ruby-runner

diff --git a/NEWS.md b/NEWS.md
@@ -302,6 +302,20 @@ Ruby 4.0 bundled RubyGems and Bundler version 4. see the following links for det
     * Interix (Windows Services for UNIX)
     * SunOS 4 (Solaris, i.e. SunOS 5, is unaffected)
     * BSD/OS (BSDi)
+    * NeXTSTEP, OpenStep and Rhapsody
+
+* Support code for the following platforms has also been removed.  None
+  of them has a platform maintainer.
+
+    * AmigaOS
+    * AtheOS
+    * ESIX
+    * HI-UX/MPP
+    * IRIX
+    * OSF/1 (Tru64 UNIX)
+    * QNX Neutrino
+    * System V Release 4
+    * UX/PDS
 
 * Windows 10 1703 or later no longer needs the `LongPathsEnabled` registry
   value to use paths longer than 260 characters.  This applies to any process

diff --git a/configure.ac b/configure.ac
@@ -575,8 +575,7 @@ AS_CASE(["$target_os"],
     ])
     rb_cv_binary_elf=no
     : ${enable_shared=yes}
-    ],
-[hiuxmpp*], [AC_DEFINE(__HIUX_MPP__)])    # by TOYODA Eizi <toyoda@npd.kishou.go.jp>
+    ])
 
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
@@ -1149,9 +1148,6 @@ AC_SUBST(POSTLINK)
 cleanlibs=
 AC_SUBST(cleanlibs)
 AS_CASE(["$target_os"],
-[nextstep*], [	],
-[openstep*], [	],
-[rhapsody*], [	],
 [darwin*], [
 		ORIG_LIBS="$LIBS"
 		RUBY_PREPEND_OPTION(LIBS, -lobjc)
@@ -1958,8 +1954,6 @@ AS_CASE(["$target_cpu"],
 [alpha*|sh4|sh4el|sh4eb], [AS_CASE(["$target_os"::"$GCC"],
 		[*::yes],  # gcc
 			[CFLAGS="-mieee $CFLAGS"],
-		[osf*],    # ccc
-			[CFLAGS="-ieee $CFLAGS"],
 		)],
 [sparc*], [AC_LIBOBJ([sparc])])
 
@@ -3171,9 +3165,8 @@ STATIC=
       RUBY_APPEND_OPTION(CCDLFLAGS, -fPIC)])
   ], [
     AS_CASE(["$target_os"],
-	[solaris*|irix*], [CCDLFLAGS="$CCDLFLAGS -KPIC"],
-	[esix*|uxpds*],   [CCDLFLAGS="$CCDLFLAGS -KPIC"],
-	                  [: ${CCDLFLAGS=""}])
+	[solaris*], [CCDLFLAGS="$CCDLFLAGS -KPIC"],
+	            [: ${CCDLFLAGS=""}])
   ])
 }
 
@@ -3212,16 +3205,6 @@ AC_SUBST(PROGRAM_EXTS, [${EXTSTATIC:+exts}])
 			    : ${PRELOADENV=LD_PRELOAD_32}
 			])
 			rb_cv_dlopen=yes],
-	[irix*], [	: ${LDSHARED='$(LD) -shared'}
-			rb_cv_dlopen=yes],
-	[sysv4*], [	: ${LDSHARED='$(LD) -G'}
-			rb_cv_dlopen=yes],
-	[nto-qnx*], [	: ${LDSHARED='$(CC) -shared'}
-			rb_cv_dlopen=yes],
-	[esix*|uxpds*], [ : ${LDSHARED='$(LD) -G'}
-			rb_cv_dlopen=yes],
-	[osf*], [	: ${LDSHARED='$(LD) -shared -expect_unresolved "*"'}
-			rb_cv_dlopen=yes],
 	[linux* | gnu* | k*bsd*-gnu | netbsd* | kopensolaris*-gnu | haiku*], [
 			: ${LDSHARED='$(CC) -shared'}
 			AS_IF([test "$rb_cv_binary_elf" = yes], [
@@ -3270,20 +3253,13 @@ AC_SUBST(PROGRAM_EXTS, [${EXTSTATIC:+exts}])
 			: ${LIBPATHENV=LIBPATH}
 			: ${PRELOADENV=LDR_PRELOAD}
 			rb_cv_dlopen=yes],
-	[nto-qnx*], [	DLDFLAGS="$DLDFLAGS -L/lib -L/usr/lib -L/usr/local/lib"
-			: ${LDSHARED='$(LD) -Bshareable -x'}
-			LDFLAGS="$LDFLAGS -L/lib -L/usr/lib -L/usr/local/lib"
-			rb_cv_dlopen=yes],
 	[cygwin*|msys*|mingw*], [
 			: ${LDSHARED='$(CC) -shared'}
 			XLDFLAGS="$XLDFLAGS -Wl,--stack,0x00200000,--enable-auto-import"
 			DLDFLAGS="${DLDFLAGS} -Wl,--enable-auto-image-base,--enable-auto-import"
 			: ${LIBPATHENV=PATH}
 			: ${PRELOADENV=""}
 			rb_cv_dlopen=yes],
-	[hiuxmpp], [	: ${LDSHARED='$(LD) -r'}],
-	[atheos*], [	: ${LDSHARED='$(CC) -shared'}
-			rb_cv_dlopen=yes],
 	[wasi*], [	: ${LDSHARED='$(LD) -shared -Xlinker --export-dynamic'}],
 	[	: ${LDSHARED='$(LD)'}])
     AC_MSG_RESULT($rb_cv_dlopen)
@@ -3441,7 +3417,7 @@ AS_IF([test x$with_valgrind != xno],
     [darwin*], [
 	SOEXT=dylib
 	DLEXT=bundle],
-    [cygwin*|msys*|mingw*|*djgpp*], [
+    [cygwin*|msys*|mingw*], [
 	LOAD_RELATIVE=1
 	SOEXT=dll
 	DLEXT=so],
@@ -3679,7 +3655,7 @@ AS_CASE("$enable_shared", [yes], [
 
   relative_libprefix="/../${multiarch+../}${libdir_basename}"
   AS_CASE(["$target_os"],
-    [linux* | gnu* | k*bsd*-gnu | atheos* | kopensolaris*-gnu | haiku*], [
+    [linux* | gnu* | k*bsd*-gnu | kopensolaris*-gnu | haiku*], [
 	RUBY_APPEND_OPTIONS(LIBRUBY_DLDFLAGS, ['-Wl,-soname,$(LIBRUBY_SONAME)' "$LDFLAGS_OPTDIR"])
 	LIBRUBY_ALIASES='$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)'
 	AS_IF([test "$load_relative" = yes], [
@@ -4242,21 +4218,6 @@ enum {
 	RUBY_APPEND_OPTION(XLDFLAGS, [-framework CoreFoundation])
 	RUBY_APPEND_OPTION(LIBRUBYARG_STATIC, [-framework CoreFoundation])
 	],
-    [osf*], [
-	AS_IF([test "$GCC" != "yes" ], [
-	  # compile something small: taint.c is fine for this.
-	  # the main point is the '-v' flag of 'cc'.
-	  AS_CASE(["`cc -v -I. -c main.c -o /tmp/main.o 2>&1`"],
-	  [*/gemc_cc*], [   # we have the new DEC GEM CC
-                        CFLAGS="$CFLAGS -oldc"
-                        ],
-          [            # we have the old MIPS CC
-                        ])
-	  # cleanup
-	  rm -f /tmp/main.o
-	  CFLAGS="$CFLAGS -std"
-	])
-	],
     [cygwin*|msys*|mingw*], [
 	LIBRUBY_DLDFLAGS="${LIBRUBY_DLDFLAGS}"' -Wl,--out-implib=$(LIBRUBY)'
 	AS_CASE(["$target_os"],

diff --git a/dir.c b/dir.c
@@ -1813,12 +1813,21 @@ nogvl_rmdir(void *ptr)
 }
 
 /*
+ * :markup: markdown
+ *
  * call-seq:
+ *   Dir.delete(dirpath) -> 0
  *   Dir.rmdir(dirpath) -> 0
+ *   Dir.unlink(dirpath) -> 0
  *
- * Removes the directory at +dirpath+ from the underlying file system:
+ * Removes the directory entry ([hard link](rdoc-ref:file/hard_links.md)) at `dirpath`,
+ * along with its associated inode:
  *
- *   Dir.rmdir('foo') # => 0
+ * ```ruby
+ * dirpath = '/tmp/tmpdir'
+ * Dir.mkdir(dirpath)
+ * Dir.rmdir(dirpath) # => 0
+ * ```
  *
  * Raises an exception if the directory is not empty.
  */

diff --git a/doc/file/hard_links.md b/doc/file/hard_links.md
@@ -0,0 +1,65 @@
+# Hard Links
+
+A _hard link_ is a filesystem entry pointing to
+an [inode](https://en.wikipedia.org/wiki/Inode) in the filesystem;
+in effect, the hard link is a name for the inode.
+
+An inode is one of these types (see File.ftype):
+
+- Regular file.
+- Directory.
+- Symbolic link.
+- FIFO.
+- \Socket.
+- Block-special device.
+- Character-special device.
+
+When an inode is created, it initially has one hard link -- its original "name":
+
+```ruby
+path0 = '/tmp/t0.tmp'
+File.write(path0, 'foo')
+stat0 = File.stat(path0)
+stat0.ino   # => 26345482  # Inode identifier; unique within filesystem.
+stat0.nlink # => 1         # Count of hard link to the inode.
+```
+
+## Multiple Hard Links
+
+The inode may have more than one hard link:
+
+```ruby
+path1 = '/tmp/t1.tmp'
+File.link(path0, path1)
+stat1 = File.stat(path1)
+stat1.ino   # => 26345482
+stat1.nlink # => 2
+```
+
+Multiple hard links to the same inode are in effect multiple names for that inode:
+
+```ruby
+File.read(path0) # => "foo"
+File.read(path1) # => "foo"
+```
+
+When an inode has more than one hard link, all its hard links are "equal";
+the original hard link is no more "valid" or "important" than the others.
+
+## Unlinking
+
+Unlinking (removing) one hard link does not remove the inode:
+
+```ruby
+File.unlink(path1)
+File.exist?(path1)     # => false  # Hard link path1 was removed.
+File.exist?(path0)     # => true   # Hard link path0 still exists.
+File.stat(path0).nlink # => 1      # Now has only one hard link.
+```
+
+But removing the last hard link does remove the inode:
+
+```ruby
+File.unlink(path0)
+File.exist?(path0) # => false  # And the inode was removed.
+```
diff --git a/ext/etc/extconf.rb b/ext/etc/extconf.rb
@@ -7,7 +7,6 @@
     headers << h
   end
 }
-have_library("sun", "getpwnam")	# NIS (== YP) interface for IRIX 4
 have_func("uname((struct utsname *)NULL)", headers)
 have_func("getlogin")
 if have_func("getpwent")

diff --git a/ext/pty/extconf.rb b/ext/pty/extconf.rb
@@ -3,7 +3,7 @@
 
 $INCFLAGS << " -I$(topdir) -I$(top_srcdir)"
 
-if /mswin|mingw|bccwin/ !~ RUBY_PLATFORM
+if /mswin|mingw/ !~ RUBY_PLATFORM
   have_header("sys/stropts.h")
   have_func("setresuid")
   have_header("libutil.h")
@@ -19,7 +19,6 @@
   end
   if openpt or
       (util or have_func("openpty")) or
-      have_func("_getpty") or
       have_func("ioctl")
     have_macro("HAVE_FCHMOD") or have_func("fchmod")
     have_macro("HAVE_FCHOWN") or have_func("fchown")

diff --git a/ext/pty/pty.c b/ext/pty/pty.c
@@ -395,23 +395,6 @@ get_device_once(int *master, int *slave, char SlaveName[DEVICELEN], int nomesg,
 
     return 0;
 
-#elif defined HAVE__GETPTY
-    /* SGI IRIX */
-    char *name;
-    mode_t mode = nomesg ? 0600 : 0622;
-
-    if (!(name = _getpty(master, O_RDWR, mode, 0))) {
-        if (!fail) return -1;
-        rb_raise(rb_eRuntimeError, "_getpty() failed");
-    }
-    rb_fd_fix_cloexec(*master);
-
-    *slave = rb_cloexec_open(name, O_RDWR, 0);
-    /* error check? */
-    rb_update_max_fd(*slave);
-    strlcpy(SlaveName, name, DEVICELEN);
-
-    return 0;
 #elif defined(HAVE_PTSNAME)
     /* System V */
     int	 masterfd = -1, slavefd = -1;

diff --git a/ext/zlib/extconf.rb b/ext/zlib/extconf.rb
@@ -82,9 +82,7 @@
   Logging::message 'checking for kind of operating system... '
   os_code = with_config('os-code') ||
     case RUBY_PLATFORM.split('-',2)[1]
-    when 'amigaos' then
-      os_code = 'AMIGA'
-    when /mswin|mingw|bccwin/ then
+    when /mswin|mingw/ then
       # NOTE: cygwin should be regarded as Unix.
       os_code = 'WIN32'
     else