4 files changed, 316 insertions, 63 deletions

diff --git a/autogen/Makefile.in b/autogen/Makefile.in
index 99805dd1fe8..34eda262d88 100644
--- a/autogen/Makefile.in
+++ b/autogen/Makefile.in
@@ -59,7 +59,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=dup --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h fdatasync fdopendir filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings memrchr mktime pselect pthread_sigmask putenv qacl readlink readlinkat sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=binary-io --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl fcntl-h fdatasync fdopendir filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings memrchr mktime pipe2 pselect pthread_sigmask putenv qacl readlink readlinkat sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
 
 VPATH = @srcdir@
 pkgdatadir = $(datadir)/@PACKAGE@
@@ -192,12 +192,13 @@ DIST_COMMON = $(srcdir)/../nt/gnulib.mk $(srcdir)/Makefile.am \
 @BUILDING_FOR_WINDOWSNT_FALSE@  ftoastr.h dup2.c errno.in.h \
 @BUILDING_FOR_WINDOWSNT_FALSE@  euidaccess.c execinfo.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  execinfo.in.h at-func.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  faccessat.c fcntl.in.h \
+@BUILDING_FOR_WINDOWSNT_FALSE@  faccessat.c fcntl.c fcntl.in.h \
 @BUILDING_FOR_WINDOWSNT_FALSE@  fdatasync.c fdopendir.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  filemode.h fpending.c fpending.h \
 @BUILDING_FOR_WINDOWSNT_FALSE@  at-func.c fstatat.c fsync.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  getgroups.c getloadavg.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  getopt.c getopt.in.h getopt1.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  getdtablesize.c getgroups.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  getloadavg.c getopt.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  getopt.in.h getopt1.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  getopt_int.h gettimeofday.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  group-member.c ignore-value.h \
 @BUILDING_FOR_WINDOWSNT_FALSE@  intprops.h inttypes.in.h lstat.c \
@@ -239,10 +240,11 @@ am__aclocal_m4_deps = $(top_srcdir)/m4/00gnulib.m4 \
         $(top_srcdir)/m4/errno_h.m4 $(top_srcdir)/m4/euidaccess.m4 \
         $(top_srcdir)/m4/execinfo.m4 $(top_srcdir)/m4/extensions.m4 \
         $(top_srcdir)/m4/extern-inline.m4 \
-        $(top_srcdir)/m4/faccessat.m4 $(top_srcdir)/m4/fcntl_h.m4 \
-        $(top_srcdir)/m4/fdatasync.m4 $(top_srcdir)/m4/fdopendir.m4 \
-        $(top_srcdir)/m4/filemode.m4 $(top_srcdir)/m4/fpending.m4 \
-        $(top_srcdir)/m4/fstatat.m4 $(top_srcdir)/m4/fsync.m4 \
+        $(top_srcdir)/m4/faccessat.m4 $(top_srcdir)/m4/fcntl.m4 \
+        $(top_srcdir)/m4/fcntl_h.m4 $(top_srcdir)/m4/fdatasync.m4 \
+        $(top_srcdir)/m4/fdopendir.m4 $(top_srcdir)/m4/filemode.m4 \
+        $(top_srcdir)/m4/fpending.m4 $(top_srcdir)/m4/fstatat.m4 \
+        $(top_srcdir)/m4/fsync.m4 $(top_srcdir)/m4/getdtablesize.m4 \
         $(top_srcdir)/m4/getgroups.m4 $(top_srcdir)/m4/getloadavg.m4 \
         $(top_srcdir)/m4/getopt.m4 $(top_srcdir)/m4/gettime.m4 \
         $(top_srcdir)/m4/gettimeofday.m4 \
@@ -255,7 +257,8 @@ am__aclocal_m4_deps = $(top_srcdir)/m4/00gnulib.m4 \
         $(top_srcdir)/m4/md5.m4 $(top_srcdir)/m4/memrchr.m4 \
         $(top_srcdir)/m4/mktime.m4 $(top_srcdir)/m4/multiarch.m4 \
         $(top_srcdir)/m4/nocrash.m4 $(top_srcdir)/m4/off_t.m4 \
-        $(top_srcdir)/m4/pathmax.m4 $(top_srcdir)/m4/pselect.m4 \
+        $(top_srcdir)/m4/pathmax.m4 $(top_srcdir)/m4/pipe2.m4 \
+        $(top_srcdir)/m4/pselect.m4 \
         $(top_srcdir)/m4/pthread_sigmask.m4 $(top_srcdir)/m4/putenv.m4 \
         $(top_srcdir)/m4/readlink.m4 $(top_srcdir)/m4/readlinkat.m4 \
         $(top_srcdir)/m4/setenv.m4 $(top_srcdir)/m4/sha1.m4 \
@@ -291,10 +294,11 @@ am__DEPENDENCIES_1 =
 am__libgnu_a_SOURCES_DIST = allocator.c c-ctype.h c-ctype.c \
         c-strcase.h c-strcasecmp.c c-strncasecmp.c careadlinkat.c \
         close-stream.c md5.c sha1.c sha256.c sha512.c dtoastr.c \
-        dtotimespec.c filemode.c gettext.h gettime.c acl-errno-valid.c \
-        file-has-acl.c qcopy-acl.c qset-acl.c stat-time.c strftime.c \
-        timespec.c timespec-add.c timespec-sub.c u64.c unistd.c \
-        utimens.c openat-die.c save-cwd.c
+        dtotimespec.c filemode.c gettext.h gettime.c pipe2.c \
+        acl-errno-valid.c file-has-acl.c qcopy-acl.c qset-acl.c \
+        stat-time.c strftime.c timespec.c timespec-add.c \
+        timespec-sub.c u64.c unistd.c utimens.c openat-die.c \
+        save-cwd.c
 am__objects_1 =
 @BUILDING_FOR_WINDOWSNT_FALSE@am_libgnu_a_OBJECTS =  \
 @BUILDING_FOR_WINDOWSNT_FALSE@  allocator.$(OBJEXT) \
@@ -311,6 +315,7 @@ am__objects_1 =
 @BUILDING_FOR_WINDOWSNT_FALSE@  filemode.$(OBJEXT) \
 @BUILDING_FOR_WINDOWSNT_FALSE@  $(am__objects_1) \
 @BUILDING_FOR_WINDOWSNT_FALSE@  gettime.$(OBJEXT) \
+@BUILDING_FOR_WINDOWSNT_FALSE@  pipe2.$(OBJEXT) \
 @BUILDING_FOR_WINDOWSNT_FALSE@  acl-errno-valid.$(OBJEXT) \
 @BUILDING_FOR_WINDOWSNT_FALSE@  file-has-acl.$(OBJEXT) \
 @BUILDING_FOR_WINDOWSNT_FALSE@  qcopy-acl.$(OBJEXT) \
@@ -346,13 +351,13 @@ am__objects_1 =
 @BUILDING_FOR_WINDOWSNT_TRUE@   u64.$(OBJEXT) utimens.$(OBJEXT) \
 @BUILDING_FOR_WINDOWSNT_TRUE@   $(am__objects_1)
 am__EXTRA_libgnu_a_SOURCES_DIST = openat-proc.c ftoastr.c dup2.c \
-        euidaccess.c execinfo.c at-func.c faccessat.c fdatasync.c \
-        fdopendir.c fpending.c fstatat.c fsync.c getgroups.c \
-        getloadavg.c getopt.c getopt1.c gettimeofday.c group-member.c \
-        lstat.c memrchr.c mktime.c pselect.c pthread_sigmask.c \
-        putenv.c acl_entries.c readlink.c readlinkat.c sig2str.c \
-        stat.c strtoimax.c strtol.c strtoll.c strtoul.c strtoull.c \
-        strtoumax.c symlink.c time_r.c unsetenv.c
+        euidaccess.c execinfo.c at-func.c faccessat.c fcntl.c \
+        fdatasync.c fdopendir.c fpending.c fstatat.c fsync.c \
+        getdtablesize.c getgroups.c getloadavg.c getopt.c getopt1.c \
+        gettimeofday.c group-member.c lstat.c memrchr.c mktime.c \
+        pselect.c pthread_sigmask.c putenv.c acl_entries.c readlink.c \
+        readlinkat.c sig2str.c stat.c strtoimax.c strtol.c strtoll.c \
+        strtoul.c strtoull.c strtoumax.c symlink.c time_r.c unsetenv.c
 libgnu_a_OBJECTS = $(am_libgnu_a_OBJECTS)
 depcomp = $(SHELL) $(top_srcdir)/build-aux/depcomp
 am__depfiles_maybe = depfiles
@@ -1237,13 +1242,14 @@ DEFAULT_INCLUDES = -I. -I$(top_srcdir)/lib -I../src -I$(top_srcdir)/src
 @BUILDING_FOR_WINDOWSNT_FALSE@  md5.c sha1.c sha256.c sha512.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  dtoastr.c dtotimespec.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  filemode.c $(am__append_10) \
-@BUILDING_FOR_WINDOWSNT_FALSE@  gettime.c acl-errno-valid.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  file-has-acl.c qcopy-acl.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  qset-acl.c stat-time.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  strftime.c timespec.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  timespec-add.c timespec-sub.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  u64.c unistd.c utimens.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  openat-die.c save-cwd.c
+@BUILDING_FOR_WINDOWSNT_FALSE@  gettime.c pipe2.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  acl-errno-valid.c file-has-acl.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  qcopy-acl.c qset-acl.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  stat-time.c strftime.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  timespec.c timespec-add.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  timespec-sub.c u64.c unistd.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  utimens.c openat-die.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  save-cwd.c
 @BUILDING_FOR_WINDOWSNT_TRUE@libgnu_a_SOURCES = c-ctype.h c-ctype.c \
 @BUILDING_FOR_WINDOWSNT_TRUE@   c-strcase.h c-strcasecmp.c \
 @BUILDING_FOR_WINDOWSNT_TRUE@   c-strncasecmp.c close-stream.c \
@@ -1262,9 +1268,10 @@ DEFAULT_INCLUDES = -I. -I$(top_srcdir)/lib -I../src -I$(top_srcdir)/src
 @BUILDING_FOR_WINDOWSNT_FALSE@EXTRA_libgnu_a_SOURCES = openat-proc.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  ftoastr.c dup2.c euidaccess.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  execinfo.c at-func.c faccessat.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  fdatasync.c fdopendir.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  fcntl.c fdatasync.c fdopendir.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  fpending.c at-func.c fstatat.c \
-@BUILDING_FOR_WINDOWSNT_FALSE@  fsync.c getgroups.c getloadavg.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  fsync.c getdtablesize.c \
+@BUILDING_FOR_WINDOWSNT_FALSE@  getgroups.c getloadavg.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  getopt.c getopt1.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  gettimeofday.c group-member.c \
 @BUILDING_FOR_WINDOWSNT_FALSE@  lstat.c memrchr.c mktime.c \
@@ -1372,6 +1379,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/euidaccess.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/execinfo.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/faccessat.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fcntl.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fdatasync.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fdopendir.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/file-has-acl.Po@am__quote@
@@ -1380,6 +1388,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fstatat.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsync.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ftoastr.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getdtablesize.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getgroups.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getloadavg.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getopt.Po@am__quote@
@@ -1393,6 +1402,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mktime.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/openat-die.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/openat-proc.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pipe2.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pselect.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pthread_sigmask.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/putenv.Po@am__quote@
diff --git a/autogen/aclocal.m4 b/autogen/aclocal.m4
index eb324b06b37..c9e796a081f 100644
--- a/autogen/aclocal.m4
+++ b/autogen/aclocal.m4
@@ -999,6 +999,7 @@ m4_include([m4/execinfo.m4])
 m4_include([m4/extensions.m4])
 m4_include([m4/extern-inline.m4])
 m4_include([m4/faccessat.m4])
+m4_include([m4/fcntl.m4])
 m4_include([m4/fcntl_h.m4])
 m4_include([m4/fdatasync.m4])
 m4_include([m4/fdopendir.m4])
@@ -1006,6 +1007,7 @@ m4_include([m4/filemode.m4])
 m4_include([m4/fpending.m4])
 m4_include([m4/fstatat.m4])
 m4_include([m4/fsync.m4])
+m4_include([m4/getdtablesize.m4])
 m4_include([m4/getgroups.m4])
 m4_include([m4/getloadavg.m4])
 m4_include([m4/getopt.m4])
@@ -1027,6 +1029,7 @@ m4_include([m4/multiarch.m4])
 m4_include([m4/nocrash.m4])
 m4_include([m4/off_t.m4])
 m4_include([m4/pathmax.m4])
+m4_include([m4/pipe2.m4])
 m4_include([m4/pselect.m4])
 m4_include([m4/pthread_sigmask.m4])
 m4_include([m4/putenv.m4])
diff --git a/autogen/config.in b/autogen/config.in
index 89ad415f3b0..3fe82ce0f92 100644
--- a/autogen/config.in
+++ b/autogen/config.in
@@ -120,6 +120,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    enabled. */
 #undef ENABLE_CHECKING
 
+/* Define this to 1 if F_DUPFD behavior does not match POSIX */
+#undef FCNTL_DUPFD_BUGGY
+
 /* Letter to use in finding device name of first PTY, if PTYs are supported.
    */
 #undef FIRST_PTY_LETTER
@@ -206,6 +209,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    startup, if using GTK. */
 #undef G_SLICE_ALWAYS_MALLOC
 
+/* Define to 1 if you have the `accept4' function. */
+#undef HAVE_ACCEPT4
+
 /* Define to 1 if you have the `access' function. */
 #undef HAVE_ACCESS
 
@@ -439,6 +445,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Define to 1 if you have the `facl' function. */
 #undef HAVE_FACL
 
+/* Define to 1 if you have the `fcntl' function. */
+#undef HAVE_FCNTL
+
 /* Define to 1 if you have the `fdatasync' function. */
 #undef HAVE_FDATASYNC
 
@@ -487,6 +496,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Define to 1 if you have the `getdelim' function. */
 #undef HAVE_GETDELIM
 
+/* Define to 1 if you have the `getdtablesize' function. */
+#undef HAVE_GETDTABLESIZE
+
 /* Define to 1 if you have the `getgrent' function. */
 #undef HAVE_GETGRENT
 
@@ -738,6 +750,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    systems that support xmenu.c. */
 #undef HAVE_MENUS
 
+/* Define to 1 if you have the `mkostemp' function. */
+#undef HAVE_MKOSTEMP
+
 /* Define to 1 if you have the `mkstemp' function. */
 #undef HAVE_MKSTEMP
 
@@ -769,6 +784,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Define to 1 if personality LINUX32 can be set. */
 #undef HAVE_PERSONALITY_LINUX32
 
+/* Define to 1 if you have the `pipe2' function. */
+#undef HAVE_PIPE2
+
 /* Define to 1 if you have the png library (-lpng). */
 #undef HAVE_PNG
 
diff --git a/autogen/configure b/autogen/configure
index 463c5905a12..2f739343d46 100755
--- a/autogen/configure
+++ b/autogen/configure
@@ -614,8 +614,6 @@ LIBGNU_LIBDEPS
 gltests_WITNESS
 gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_FALSE
 gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_TRUE
-gl_GNULIB_ENABLED_verify_FALSE
-gl_GNULIB_ENABLED_verify_TRUE
 gl_GNULIB_ENABLED_strtoull_FALSE
 gl_GNULIB_ENABLED_strtoull_TRUE
 gl_GNULIB_ENABLED_strtoll_FALSE
@@ -634,6 +632,8 @@ gl_GNULIB_ENABLED_be453cec5eecf5731a274f2de7f2db36_FALSE
 gl_GNULIB_ENABLED_be453cec5eecf5731a274f2de7f2db36_TRUE
 gl_GNULIB_ENABLED_getgroups_FALSE
 gl_GNULIB_ENABLED_getgroups_TRUE
+gl_GNULIB_ENABLED_getdtablesize_FALSE
+gl_GNULIB_ENABLED_getdtablesize_TRUE
 gl_GNULIB_ENABLED_euidaccess_FALSE
 gl_GNULIB_ENABLED_euidaccess_TRUE
 gl_GNULIB_ENABLED_dosname_FALSE
@@ -3373,6 +3373,7 @@ as_fn_append ac_func_list " readlinkat"
 as_fn_append ac_header_list " dirent.h"
 as_fn_append ac_header_list " execinfo.h"
 as_fn_append ac_func_list " faccessat"
+as_fn_append ac_func_list " fcntl"
 as_fn_append ac_func_list " fdopendir"
 as_fn_append ac_header_list " stdio_ext.h"
 as_fn_append ac_func_list " __fpending"
@@ -3387,6 +3388,7 @@ as_fn_append ac_header_list " wchar.h"
 as_fn_append ac_header_list " stdint.h"
 as_fn_append ac_header_list " inttypes.h"
 as_fn_append ac_func_list " lstat"
+as_fn_append ac_func_list " pipe2"
 as_fn_append ac_header_list " sys/select.h"
 as_fn_append ac_func_list " pselect"
 as_fn_append ac_func_list " pthread_sigmask"
@@ -3402,6 +3404,7 @@ as_fn_append ac_func_list " futimesat"
 as_fn_append ac_func_list " futimens"
 as_fn_append ac_func_list " utimensat"
 as_fn_append ac_func_list " lutimes"
+as_fn_append ac_func_list " getdtablesize"
 # Check that the precious variables saved in the cache have kept the same
 # value.
 ac_cache_corrupted=false
@@ -7247,6 +7250,7 @@ esac
 
   # Code from module extern-inline:
   # Code from module faccessat:
+  # Code from module fcntl:
   # Code from module fcntl-h:
   # Code from module fdatasync:
   # Code from module fdopendir:
@@ -7254,6 +7258,7 @@ esac
   # Code from module fpending:
   # Code from module fstatat:
   # Code from module fsync:
+  # Code from module getdtablesize:
   # Code from module getgroups:
   # Code from module getloadavg:
   # Code from module getopt-gnu:
@@ -7276,6 +7281,7 @@ esac
   # Code from module nocrash:
   # Code from module openat-h:
   # Code from module pathmax:
+  # Code from module pipe2:
   # Code from module pselect:
   # Code from module pthread_sigmask:
   # Code from module putenv:
@@ -14655,14 +14661,14 @@ esac
 
 
 
-for ac_func in gethostname \
+for ac_func in accept4 gethostname \
 getrusage get_current_dir_name \
 lrand48 \
 select getpagesize setlocale \
 getrlimit setrlimit shutdown getaddrinfo \
 strsignal setitimer \
 sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
-gai_strerror mkstemp getline getdelim sync \
+gai_strerror mkostemp mkstemp getline getdelim sync \
 difftime posix_memalign \
 getpwent endpwent getgrent endgrent \
 touchlock \
@@ -16433,7 +16439,7 @@ $as_echo "#define UNIX98_PTYS 1" >>confdefs.h
                   $as_echo "#define PTY_TTY_NAME_SPRINTF { char *ptyname = 0; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); if (grantpt (fd) != -1 && unlockpt (fd) != -1) ptyname = ptsname(fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (!ptyname) { close (fd); return -1; } snprintf (pty_name, sizeof pty_name, \"%s\", ptyname); }" >>confdefs.h
 
             if test "x$ac_cv_func_posix_openpt" = xyes; then
-        $as_echo "#define PTY_OPEN fd = posix_openpt (O_RDWR | O_NOCTTY)" >>confdefs.h
+        $as_echo "#define PTY_OPEN fd = posix_openpt (O_RDWR | O_CLOEXEC | O_NOCTTY)" >>confdefs.h
 
         $as_echo "#define PTY_NAME_SPRINTF /**/" >>confdefs.h
 
@@ -18402,6 +18408,8 @@ $as_echo "$gl_cv_header_errno_h_EOVERFLOW" >&6; }
   REPLACE_OPENAT=0;
 
 
+
+
 ac_fn_c_check_type "$LINENO" "mode_t" "ac_cv_type_mode_t" "$ac_includes_default"
 if test "x$ac_cv_type_mode_t" = x""yes; then :
 
@@ -20692,6 +20700,8 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+
+
   GNULIB_PSELECT=0;
   GNULIB_SELECT=0;
     HAVE_PSELECT=1;
@@ -21891,6 +21901,8 @@ _ACEOF
 
 
 
+
+
    if false; then
   GL_COND_LIBTOOL_TRUE=
   GL_COND_LIBTOOL_FALSE='#'
@@ -22441,6 +22453,169 @@ _ACEOF
 
 
 
+  if test $ac_cv_func_fcntl = no; then
+
+
+
+  if test $ac_cv_func_fcntl = no; then
+    HAVE_FCNTL=0
+  else
+    REPLACE_FCNTL=1
+  fi
+
+  else
+            { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether fcntl handles F_DUPFD correctly" >&5
+$as_echo_n "checking whether fcntl handles F_DUPFD correctly... " >&6; }
+if test "${gl_cv_func_fcntl_f_dupfd_works+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then :
+  # Guess that it works on glibc systems
+          case $host_os in #((
+            *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";;
+            *)      gl_cv_func_fcntl_f_dupfd_works="guessing no";;
+          esac
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <fcntl.h>
+#include <errno.h>
+
+int
+main ()
+{
+int result = 0;
+      if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
+      if (errno != EINVAL) result |= 2;
+      return result;
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  gl_cv_func_fcntl_f_dupfd_works=yes
+else
+  gl_cv_func_fcntl_f_dupfd_works=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gl_cv_func_fcntl_f_dupfd_works" >&5
+$as_echo "$gl_cv_func_fcntl_f_dupfd_works" >&6; }
+    case $gl_cv_func_fcntl_f_dupfd_works in
+      *yes) ;;
+      *)
+
+
+  if test $ac_cv_func_fcntl = no; then
+    HAVE_FCNTL=0
+  else
+    REPLACE_FCNTL=1
+  fi
+
+
+$as_echo "#define FCNTL_DUPFD_BUGGY 1" >>confdefs.h
+ ;;
+    esac
+
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether fcntl understands F_DUPFD_CLOEXEC" >&5
+$as_echo_n "checking whether fcntl understands F_DUPFD_CLOEXEC... " >&6; }
+if test "${gl_cv_func_fcntl_f_dupfd_cloexec+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <fcntl.h>
+#ifndef F_DUPFD_CLOEXEC
+choke me
+#endif
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifdef __linux__
+/* The Linux kernel only added F_DUPFD_CLOEXEC in 2.6.24, so we always replace
+   it to support the semantics on older kernels that failed with EINVAL.  */
+choke me
+#endif
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  gl_cv_func_fcntl_f_dupfd_cloexec=yes
+else
+  gl_cv_func_fcntl_f_dupfd_cloexec="needs runtime check"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+else
+  gl_cv_func_fcntl_f_dupfd_cloexec=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gl_cv_func_fcntl_f_dupfd_cloexec" >&5
+$as_echo "$gl_cv_func_fcntl_f_dupfd_cloexec" >&6; }
+    if test "$gl_cv_func_fcntl_f_dupfd_cloexec" != yes; then
+
+
+
+  if test $ac_cv_func_fcntl = no; then
+    HAVE_FCNTL=0
+  else
+    REPLACE_FCNTL=1
+  fi
+
+          fi
+  fi
+
+
+  if test $HAVE_FCNTL = 0 || test $REPLACE_FCNTL = 1; then
+
+
+
+
+
+
+
+
+  gl_LIBOBJS="$gl_LIBOBJS fcntl.$ac_objext"
+
+  fi
+
+
+
+
+
+          GNULIB_FCNTL=1
+
+
+
+
+
+
+
+
+
+
 
 
 
@@ -24150,6 +24325,27 @@ $as_echo "$gl_cv_func_working_mktime" >&6; }
 
 
 
+
+  if test $ac_cv_func_pipe2 != yes; then
+    HAVE_PIPE2=0
+  fi
+
+
+
+
+
+
+          GNULIB_PIPE2=1
+
+
+
+
+
+
+
+
+
+
   if test $ac_cv_func_pselect = yes; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether signature of pselect conforms to POSIX" >&5
 $as_echo_n "checking whether signature of pselect conforms to POSIX... " >&6; }
@@ -25637,7 +25833,8 @@ else
 
             /* Test _Alignas only on platforms where gnulib can help.  */
             #if \
-                (__GNUC__ || __IBMC__ || __IBMCPP__ \
+                ((defined __cplusplus && 201103 <= __cplusplus) \
+                 || __GNUC__ || __IBMC__ || __IBMCPP__ || __ICC \
                  || 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER)
               struct alignas_test { char c; char alignas (8) alignas_8; };
               char test_alignas[offsetof (struct alignas_test, alignas_8) == 8
@@ -27260,6 +27457,7 @@ $as_echo "#define FUTIMESAT_NULL_BUG 1" >>confdefs.h
   gl_gnulib_enabled_260941c0e5dc67ec9e87d1fb321c300b=false
   gl_gnulib_enabled_dosname=false
   gl_gnulib_enabled_euidaccess=false
+  gl_gnulib_enabled_getdtablesize=false
   gl_gnulib_enabled_getgroups=false
   gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36=false
   gl_gnulib_enabled_a9786850e999ae65a836a6041e8e5ed1=false
@@ -27269,7 +27467,6 @@ $as_echo "#define FUTIMESAT_NULL_BUG 1" >>confdefs.h
   gl_gnulib_enabled_stat=false
   gl_gnulib_enabled_strtoll=false
   gl_gnulib_enabled_strtoull=false
-  gl_gnulib_enabled_verify=false
   gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec=false
   func_gl_gnulib_m4code_260941c0e5dc67ec9e87d1fb321c300b ()
   {
@@ -27549,6 +27746,43 @@ done
       fi
     fi
   }
+  func_gl_gnulib_m4code_getdtablesize ()
+  {
+    if ! $gl_gnulib_enabled_getdtablesize; then
+
+
+
+  if test $ac_cv_func_getdtablesize != yes; then
+    HAVE_GETDTABLESIZE=0
+  fi
+
+      if test $HAVE_GETDTABLESIZE = 0; then
+
+
+
+
+
+
+
+
+  gl_LIBOBJS="$gl_LIBOBJS getdtablesize.$ac_objext"
+
+        :
+      fi
+
+
+
+
+
+          GNULIB_GETDTABLESIZE=1
+
+
+
+
+
+      gl_gnulib_enabled_getdtablesize=true
+    fi
+  }
   func_gl_gnulib_m4code_getgroups ()
   {
     if ! $gl_gnulib_enabled_getgroups; then
@@ -27971,9 +28205,6 @@ $as_echo "#define REPLACE_FUNC_STAT_FILE 1" >>confdefs.h
       if test $REPLACE_STAT = 1; then
         func_gl_gnulib_m4code_pathmax
       fi
-      if test $REPLACE_STAT = 1; then
-        func_gl_gnulib_m4code_verify
-      fi
     fi
   }
   func_gl_gnulib_m4code_strtoll ()
@@ -28080,12 +28311,6 @@ done
       gl_gnulib_enabled_strtoull=true
     fi
   }
-  func_gl_gnulib_m4code_verify ()
-  {
-    if ! $gl_gnulib_enabled_verify; then
-      gl_gnulib_enabled_verify=true
-    fi
-  }
   func_gl_gnulib_m4code_682e609604ccaac6be382e4ee3a4eaec ()
   {
     if ! $gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec; then
@@ -28104,6 +28329,9 @@ done
   if test $HAVE_FACCESSAT = 0; then
     func_gl_gnulib_m4code_03e0aaad4cb89ca757653bd367a6ccb7
   fi
+  if test $HAVE_FCNTL = 0 || test $REPLACE_FCNTL = 1; then
+    func_gl_gnulib_m4code_getdtablesize
+  fi
   if test $HAVE_FDOPENDIR = 0; then
     func_gl_gnulib_m4code_260941c0e5dc67ec9e87d1fb321c300b
   fi
@@ -28140,15 +28368,9 @@ done
   if { test $HAVE_STRTOIMAX = 0 || test $REPLACE_STRTOIMAX = 1; } && test $ac_cv_type_long_long_int = yes; then
     func_gl_gnulib_m4code_strtoll
   fi
-  if test $HAVE_STRTOIMAX = 0 || test $REPLACE_STRTOIMAX = 1; then
-    func_gl_gnulib_m4code_verify
-  fi
   if test $ac_cv_func_strtoumax = no && test $ac_cv_type_unsigned_long_long_int = yes; then
     func_gl_gnulib_m4code_strtoull
   fi
-  if test $ac_cv_func_strtoumax = no; then
-    func_gl_gnulib_m4code_verify
-  fi
 
    if $gl_gnulib_enabled_260941c0e5dc67ec9e87d1fb321c300b; then
   gl_GNULIB_ENABLED_260941c0e5dc67ec9e87d1fb321c300b_TRUE=
@@ -28174,6 +28396,14 @@ else
   gl_GNULIB_ENABLED_euidaccess_FALSE=
 fi
 
+   if $gl_gnulib_enabled_getdtablesize; then
+  gl_GNULIB_ENABLED_getdtablesize_TRUE=
+  gl_GNULIB_ENABLED_getdtablesize_FALSE='#'
+else
+  gl_GNULIB_ENABLED_getdtablesize_TRUE='#'
+  gl_GNULIB_ENABLED_getdtablesize_FALSE=
+fi
+
    if $gl_gnulib_enabled_getgroups; then
   gl_GNULIB_ENABLED_getgroups_TRUE=
   gl_GNULIB_ENABLED_getgroups_FALSE='#'
@@ -28246,14 +28476,6 @@ else
   gl_GNULIB_ENABLED_strtoull_FALSE=
 fi
 
-   if $gl_gnulib_enabled_verify; then
-  gl_GNULIB_ENABLED_verify_TRUE=
-  gl_GNULIB_ENABLED_verify_FALSE='#'
-else
-  gl_GNULIB_ENABLED_verify_TRUE='#'
-  gl_GNULIB_ENABLED_verify_FALSE=
-fi
-
    if $gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec; then
   gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_TRUE=
   gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_FALSE='#'
@@ -28715,6 +28937,10 @@ if test -z "${gl_GNULIB_ENABLED_euidaccess_TRUE}" && test -z "${gl_GNULIB_ENABLE
   as_fn_error "conditional \"gl_GNULIB_ENABLED_euidaccess\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${gl_GNULIB_ENABLED_getdtablesize_TRUE}" && test -z "${gl_GNULIB_ENABLED_getdtablesize_FALSE}"; then
+  as_fn_error "conditional \"gl_GNULIB_ENABLED_getdtablesize\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${gl_GNULIB_ENABLED_getgroups_TRUE}" && test -z "${gl_GNULIB_ENABLED_getgroups_FALSE}"; then
   as_fn_error "conditional \"gl_GNULIB_ENABLED_getgroups\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
@@ -28751,10 +28977,6 @@ if test -z "${gl_GNULIB_ENABLED_strtoull_TRUE}" && test -z "${gl_GNULIB_ENABLED_
   as_fn_error "conditional \"gl_GNULIB_ENABLED_strtoull\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
-if test -z "${gl_GNULIB_ENABLED_verify_TRUE}" && test -z "${gl_GNULIB_ENABLED_verify_FALSE}"; then
-  as_fn_error "conditional \"gl_GNULIB_ENABLED_verify\" was never defined.
-Usually this means the macro was only invoked conditionally." "$LINENO" 5
-fi
 if test -z "${gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_TRUE}" && test -z "${gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec_FALSE}"; then
   as_fn_error "conditional \"gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5