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bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/getlogin.rb

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+require 'ffi'
+
+module Foo
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  attach_function :getlogin, [ ], :string
+end
+puts "getlogin=#{Foo.getlogin}"

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/getpid.rb

@@ -0,0 +1,8 @@
+require 'ffi'
+
+module Foo
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  attach_function :getpid, [ ], :int
+end
+puts "My pid=#{Foo.getpid}"

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/gettimeofday.rb

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+require 'ffi'
+require 'rbconfig'
+
+class Timeval < FFI::Struct
+  layout tv_sec: :ulong, tv_usec: :ulong
+end
+module LibC
+  extend FFI::Library
+  if FFI::Platform.windows?
+    ffi_lib RbConfig::CONFIG["LIBRUBY_SO"]
+  else
+    ffi_lib FFI::Library::LIBC
+  end
+  attach_function :gettimeofday, [ :pointer, :pointer ], :int
+end
+t = Timeval.new
+LibC.gettimeofday(t.pointer, nil)
+puts "t.tv_sec=#{t[:tv_sec]} t.tv_usec=#{t[:tv_usec]}"

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/hello.rb

@@ -0,0 +1,8 @@
+require 'ffi'
+
+module Foo
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  attach_function("cputs", "puts", [ :string ], :int)
+end
+Foo.cputs("Hello, World via libc puts using FFI on MRI ruby")

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/hello_ractor.rb

@@ -0,0 +1,19 @@
+# See the ffi wiki for how to use FFI with Ractors:
+# https://github.com/ffi/ffi/wiki/Ractors
+
+require 'ffi'
+
+class Ractor
+  # compat with Ruby-3.4 and older
+  alias value take unless method_defined? :value
+end
+
+module Foo
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  attach_function("cputs", "puts", [ :string ], :int)
+  freeze
+end
+Ractor.new do
+  Foo.cputs("Hello, World via libc puts using FFI in a Ractor")
+end.value

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/inotify.rb

@@ -0,0 +1,60 @@
+require 'ffi'
+
+module Inotify
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  class Event < FFI::Struct
+    layout \
+      :wd, :int,
+      :mask, :uint,
+      :cookie, :uint,
+      :len, :uint
+  end
+  attach_function :init, :inotify_init, [ ], :int
+  attach_function :add_watch, :inotify_add_watch, [ :int, :string, :uint ], :int
+  attach_function :rm_watch, :inotify_rm_watch, [ :int, :uint ], :int
+  attach_function :read, [ :int, :buffer_out, :uint ], :int
+  IN_ACCESS=0x00000001
+  IN_MODIFY=0x00000002
+  IN_ATTRIB=0x00000004
+  IN_CLOSE_WRITE=0x00000008
+  IN_CLOSE_NOWRITE=0x00000010
+  IN_CLOSE=(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE)
+  IN_OPEN=0x00000020
+  IN_MOVED_FROM=0x00000040
+  IN_MOVED_TO=0x00000080
+  IN_MOVE= (IN_MOVED_FROM | IN_MOVED_TO)
+  IN_CREATE=0x00000100
+  IN_DELETE=0x00000200
+  IN_DELETE_SELF=0x00000400
+  IN_MOVE_SELF=0x00000800
+  # Events sent by the kernel.
+  IN_UNMOUNT=0x00002000
+  IN_Q_OVERFLOW=0x00004000
+  IN_IGNORED=0x00008000
+  IN_ONLYDIR=0x01000000
+  IN_DONT_FOLLOW=0x02000000
+  IN_MASK_ADD=0x20000000
+  IN_ISDIR=0x40000000
+  IN_ONESHOT=0x80000000
+  IN_ALL_EVENTS=(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE \
+                          | IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM \
+                          | IN_MOVED_TO | IN_CREATE | IN_DELETE \
+                          | IN_DELETE_SELF | IN_MOVE_SELF)
+
+end
+if $0 == __FILE__
+  fd = Inotify.init
+  puts "fd=#{fd}"
+  wd = Inotify.add_watch(fd, "/tmp/", Inotify::IN_ALL_EVENTS)
+  fp = FFI::IO.for_fd(fd)
+  puts "wfp=#{fp}"
+  while true
+    buf = FFI::Buffer.alloc_out(Inotify::Event.size + 4096, 1, false)
+    ev = Inotify::Event.new buf
+    ready = IO.select([ fp ], nil, nil, nil)
+    n = Inotify.read(fd, buf, buf.total)
+    puts "Read #{n} bytes from inotify fd"
+    puts "event.wd=#{ev[:wd]} mask=#{ev[:mask]} len=#{ev[:len]} name=#{ev[:len] > 0 ? buf.get_string(16) : 'unknown'}"
+  end
+end

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/pty.rb

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+require 'ffi'
+
+module PTY
+  private
+  module LibC
+    extend FFI::Library
+    ffi_lib FFI::Library::LIBC
+    attach_function :forkpty, [ :buffer_out, :buffer_out, :buffer_in, :buffer_in ], :int
+    attach_function :openpty, [ :buffer_out, :buffer_out, :buffer_out, :buffer_in, :buffer_in ], :int
+    attach_function :login_tty, [ :int ], :int
+    attach_function :close, [ :int ], :int
+    attach_function :strerror, [ :int ], :string
+    attach_function :fork, [], :int
+    attach_function :execv, [ :string, :buffer_in ], :int
+    attach_function :execvp, [ :string, :buffer_in ], :int
+    attach_function :dup2, [ :int, :int ], :int
+    attach_function :dup, [ :int ], :int
+  end
+  Buffer = FFI::Buffer
+  def self.build_args(args)
+    cmd = args.shift
+    cmd_args = args.map do |arg|
+      MemoryPointer.from_string(arg)
+    end
+    exec_args = MemoryPointer.new(:pointer, 1 + cmd_args.length + 1)
+    exec_cmd = MemoryPointer.from_string(cmd)
+    exec_args[0].put_pointer(0, exec_cmd)
+    cmd_args.each_with_index do |arg, i|
+      exec_args[i + 1].put_pointer(0, arg)
+    end
+    [ cmd, exec_args ]
+  end
+  public
+  def self.getpty(*args)
+    mfdp = Buffer.new :int
+    name = Buffer.new 1024
+    #
+    # All the execv setup is done in the parent, since doing anything other than
+    # execv in the child after fork is really flakey
+    #
+    exec_cmd, exec_args = build_args(args)
+    pid = LibC.forkpty(mfdp, name, nil, nil)
+    raise "forkpty failed: #{LibC.strerror(FFI.errno)}" if pid < 0
+    if pid == 0
+      LibC.execvp(exec_cmd, exec_args)
+      exit 1
+    end
+    masterfd = mfdp.get_int(0)
+    rfp = FFI::IO.for_fd(masterfd, "r")
+    wfp = FFI::IO.for_fd(LibC.dup(masterfd), "w")
+    if block_given?
+      yield rfp, wfp, pid
+      rfp.close unless rfp.closed?
+      wfp.close unless wfp.closed?
+    else
+      [ rfp, wfp, pid ]
+    end
+  end
+  def self.spawn(*args, &block)
+    self.getpty("/bin/sh", "-c", args[0], &block)
+  end
+end
+module LibC
+  extend FFI::Library
+  attach_function :close, [ :int ], :int
+  attach_function :write, [ :int, :buffer_in, :ulong ], :long
+  attach_function :read, [ :int, :buffer_out, :ulong ], :long
+end
+PTY.getpty("/bin/ls", "-alR", "/") { |rfd, wfd, pid|
+#PTY.spawn("ls -laR /") { |rfd, wfd, pid|
+  puts "child pid=#{pid}"
+  while !rfd.eof? && (buf = rfd.gets)
+    puts "child: '#{buf.strip}'"
+  end
+}

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/qsort.rb

@@ -0,0 +1,20 @@
+require 'ffi'
+
+module LibC
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  callback :qsort_cmp, [ :pointer, :pointer ], :int
+  attach_function :qsort, [ :pointer, :ulong, :ulong, :qsort_cmp ], :int
+end
+
+p = FFI::MemoryPointer.new(:int, 2)
+p.put_array_of_int32(0, [ 2, 1 ])
+puts "ptr=#{p.inspect}"
+puts "Before qsort #{p.get_array_of_int32(0, 2).join(', ')}"
+LibC.qsort(p, 2, 4) do |p1, p2|
+  i1 = p1.get_int32(0)
+  i2 = p2.get_int32(0)
+  puts "In block: comparing #{i1} and #{i2}"
+  i1 < i2 ? -1 : i1 > i2 ? 1 : 0
+end
+puts "After qsort #{p.get_array_of_int32(0, 2).join(', ')}"

bin/gems/ffi-1.17.4-x86_64-linux-gnu/samples/qsort_ractor.rb

@@ -0,0 +1,36 @@
+# See the ffi wiki for how to use FFI with Ractors:
+# https://github.com/ffi/ffi/wiki/Ractors
+
+require 'ffi'
+
+class Ractor
+  # compat with Ruby-3.4 and older
+  alias value take unless method_defined? :value
+end
+
+module LibC
+  extend FFI::Library
+  ffi_lib FFI::Library::LIBC
+  callback :qsort_cmp, [ :pointer, :pointer ], :int
+  attach_function :qsort, [ :pointer, :ulong, :ulong, :qsort_cmp ], :int
+
+  freeze # Freeze the module variables, so that it can be shared across ractors.
+end
+
+p = FFI::MemoryPointer.new(:int, 3)
+p.put_array_of_int32(0, [ 2, 3, 1 ])   # Write some unsorted data into the memory
+# Ractor.make_shareable(p)             # freeze the pointer to be shared between ractors instead of copied
+puts "main  -ptr=#{p.inspect}"
+res = Ractor.new(p) do |p|
+  puts "ractor-ptr=#{p.inspect}"
+  puts "Before qsort #{p.get_array_of_int32(0, 3).join(', ')}"
+  LibC.qsort(p, 3, 4) do |p1, p2|
+    i1 = p1.get_int32(0)
+    i2 = p2.get_int32(0)
+    puts "In block: comparing #{i1} and #{i2}"
+    i1 < i2 ? -1 : i1 > i2 ? 1 : 0
+  end
+  puts "After qsort #{p.get_array_of_int32(0, 3).join(', ')}"
+end.value
+
+puts "After ractor termination #{p.get_array_of_int32(0, 3).join(', ')}"