Update libev to 4.31

Fixes #1504

CHANGES.rst

@@ -14,6 +14,11 @@ Platform and Packaging Updates
   3.7.6 and 3.8.1. It is also tested with PyPy2 7.3 and PyPy 3.6
   7.3.
 
+Library and Dependency Updates
+------------------------------
+
+- Upgrade libev from 4.25 to 4.31 and update its embedded
+  ``config.guess`` to the latest.
 
 1.5a3 (2020-01-01)
 ==================

deps/libev/Changes

 Revision history for libev, a high-performance and full-featured event loop.
 
+TODO: revisit 59.x timer in the light of modern powersaving
+TODO: document EV_TSTAMP_T
+
+4.31 Fri Dec 20 21:58:29 CET 2019
+	- handle backends with minimum wait time a bit better by not
+          waiting in the presence of already-expired timers
+          (behaviour reported by Felipe Gasper).
+        - new feature: use timerfd to detect timejumps quickly,
+          can be disabled with the new EVFLAG_NOTIMERFD loop flag.
+        - document EV_USE_SIGNALFD feature macro.
+
+4.30 (EV only)
+	- change non-autoconf test for __kernel_rwf_t by testing
+          LINUX_VERSION_CODE, the most direct test I could find.
+        - fix a bug in the io_uring backend that polled the wrong
+          backend fd, causing it to not work in many cases.
+
+4.29 (EV only)
+	- add io uring autoconf and non-autoconf detection.
+        - disable io_uring when some header files are too old.
+
+4.28 (EV only)
+	- linuxaio backend resulted in random memory corruption
+          when loop is forked.
+        - linuxaio backend might have tried to cancel an iocb
+          multiple times (was unable to trigger this).
+        - linuxaio backend now employs a generation counter to
+          avoid handling spurious events from cancelled requests.
+	- io_cancel can return EINTR, deal with it. also, assume
+          io_submit also returns EINTR.
+        - fix some other minor bugs in linuxaio backend.
+        - ev_tstamp type can now be overriden by defining EV_TSTAMP_T.
+        - cleanup: replace expect_true/false and noinline by their
+          libecb counterparts.
+        - move syscall infrastructure from ev_linuxaio.c to ev.c.
+        - prepare io_uring integration.
+        - tweak ev_floor.
+        - epoll, poll, win32 Sleep and other places that use millisecond
+          reslution now all try to round up times.
+        - solaris port backend didn't compile.
+        - abstract time constants into their macros, for more flexibility.
+
+4.27 Thu Jun 27 22:43:44 CEST 2019
+	- linux aio backend almost completely rewritten to work around its
+          limitations.
+        - linux aio backend now requires linux 4.19+.
+        - epoll backend now mandatory for linux aio backend.
+        - fail assertions more aggressively on invalid fd's detected
+          in the event loop, do not just silently fd_kill in case of
+          user error.
+        - ev_io_start/ev_io_stop now verify the watcher fd using
+          a syscall when EV_VERIFY is 2 or higher.
+
+4.26 (EV only)
+	- update to libecb 0x00010006.
+	- new experimental linux aio backend (linux 4.18+).
+	- removed redundant 0-ptr check in ev_once.
+        - updated/extended ev_set_allocator documentation.
+        - replaced EMPTY2 macro by array_needsize_noinit.
+        - minor code cleanups.
+        - epoll backend now uses epoll_create1 also after fork.
+
 4.25 Fri Dec 21 07:49:20 CET 2018
         - INCOMPATIBLE CHANGE: EV_THROW was renamed to EV_NOEXCEPT
-          (EV_THROW sitll provided) and now uses noexcept on C++11 or newer.
-	- move the darwin select workaround highe rin ev.c, as newer versions of
+          (EV_THROW still provided) and now uses noexcept on C++11 or newer.
+	- move the darwin select workaround higher in ev.c, as newer versions of
           darwin managed to break their broken select even more.
 	- ANDROID => __ANDROID__ (reported by enh@google.com).
         - disable epoll_create1 on android because it has broken header files

deps/libev/Makefile.in

-# Makefile.in generated by automake 1.15 from Makefile.am.
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -157,7 +157,8 @@ am__v_at_0 = @
 am__v_at_1 = 
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp = $(SHELL) $(top_srcdir)/depcomp
-am__depfiles_maybe = depfiles
+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/ev.Plo ./$(DEPDIR)/event.Plo
 am__mv = mv -f
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
@@ -351,7 +352,8 @@ AUTOMAKE_OPTIONS = foreign
 VERSION_INFO = 4:0:0
 EXTRA_DIST = LICENSE Changes libev.m4 autogen.sh \
 	     ev_vars.h ev_wrap.h \
-	     ev_epoll.c ev_select.c ev_poll.c ev_kqueue.c ev_port.c ev_win32.c \
+	     ev_epoll.c ev_select.c ev_poll.c ev_kqueue.c ev_port.c ev_linuxaio.c ev_iouring.c \
+             ev_win32.c \
 	     ev.3 ev.pod Symbols.ev Symbols.event
 
 man_MANS = ev.3
@@ -385,8 +387,8 @@ Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	    echo ' $(SHELL) ./config.status'; \
 	    $(SHELL) ./config.status;; \
 	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__maybe_remake_depfiles);; \
 	esac;
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
@@ -457,8 +459,14 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ev.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/event.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ev.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/event.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
 
 .c.o:
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
@@ -613,7 +621,10 @@ distclean-tags:
 	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
 	-rm -f cscope.out cscope.in.out cscope.po.out cscope.files
 
-distdir: $(DISTFILES)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
 	$(am__remove_distdir)
 	test -d "$(distdir)" || mkdir "$(distdir)"
 	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
@@ -653,7 +664,7 @@ distdir: $(DISTFILES)
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
 	|| chmod -R a+r "$(distdir)"
 dist-gzip: distdir
-	tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
+	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
 	$(am__post_remove_distdir)
 
 dist-bzip2: distdir
@@ -679,7 +690,7 @@ dist-shar: distdir
 	@echo WARNING: "Support for shar distribution archives is" \
 	               "deprecated." >&2
 	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
-	shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
+	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
 	$(am__post_remove_distdir)
 
 dist-zip: distdir
@@ -697,7 +708,7 @@ dist dist-all:
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -707,7 +718,7 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac
@@ -820,7 +831,8 @@ clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
 
 distclean: distclean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-	-rm -rf ./$(DEPDIR)
+		-rm -f ./$(DEPDIR)/ev.Plo
+	-rm -f ./$(DEPDIR)/event.Plo
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-hdr distclean-libtool distclean-tags
@@ -868,7 +880,8 @@ installcheck-am:
 maintainer-clean: maintainer-clean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf $(top_srcdir)/autom4te.cache
-	-rm -rf ./$(DEPDIR)
+		-rm -f ./$(DEPDIR)/ev.Plo
+	-rm -f ./$(DEPDIR)/event.Plo
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
@@ -892,24 +905,24 @@ uninstall-man: uninstall-man3
 
 .MAKE: all install-am install-strip
 
-.PHONY: CTAGS GTAGS TAGS all all-am am--refresh check check-am clean \
-	clean-cscope clean-generic clean-libLTLIBRARIES clean-libtool \
-	cscope cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
-	dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
-	distcheck distclean distclean-compile distclean-generic \
-	distclean-hdr distclean-libtool distclean-tags distcleancheck \
-	distdir distuninstallcheck dvi dvi-am html html-am info \
-	info-am install install-am install-data install-data-am \
-	install-dvi install-dvi-am install-exec install-exec-am \
-	install-html install-html-am install-includeHEADERS \
-	install-info install-info-am install-libLTLIBRARIES \
-	install-man install-man3 install-pdf install-pdf-am install-ps \
-	install-ps-am install-strip installcheck installcheck-am \
-	installdirs maintainer-clean maintainer-clean-generic \
-	mostlyclean mostlyclean-compile mostlyclean-generic \
-	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
-	uninstall-am uninstall-includeHEADERS uninstall-libLTLIBRARIES \
-	uninstall-man uninstall-man3
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles am--refresh check \
+	check-am clean clean-cscope clean-generic clean-libLTLIBRARIES \
+	clean-libtool cscope cscopelist-am ctags ctags-am dist \
+	dist-all dist-bzip2 dist-gzip dist-lzip dist-shar dist-tarZ \
+	dist-xz dist-zip distcheck distclean distclean-compile \
+	distclean-generic distclean-hdr distclean-libtool \
+	distclean-tags distcleancheck distdir distuninstallcheck dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-includeHEADERS install-info install-info-am \
+	install-libLTLIBRARIES install-man install-man3 install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-includeHEADERS \
+	uninstall-libLTLIBRARIES uninstall-man uninstall-man3
 
 .PRECIOUS: Makefile
 

deps/libev/README

@@ -18,7 +18,8 @@ ABOUT
    - extensive and detailed, readable documentation (not doxygen garbage).
    - fully supports fork, can detect fork in various ways and automatically
      re-arms kernel mechanisms that do not support fork.
-   - highly optimised select, poll, epoll, kqueue and event ports backends.
+   - highly optimised select, poll, linux epoll, linux aio, bsd kqueue
+     and solaris event ports backends.
    - filesystem object (path) watching (with optional linux inotify support).
    - wallclock-based times (using absolute time, cron-like).
    - relative timers/timeouts (handle time jumps).

deps/libev/config.guess

 #! /bin/sh
 # Attempt to guess a canonical system name.
-#   Copyright 1992-2019 Free Software Foundation, Inc.
+#   Copyright 1992-2020 Free Software Foundation, Inc.
 
-timestamp='2019-03-04'
+timestamp='2020-01-01'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -50,7 +50,7 @@ version="\
 GNU config.guess ($timestamp)
 
 Originally written by Per Bothner.
-Copyright 1992-2019 Free Software Foundation, Inc.
+Copyright 1992-2020 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -99,6 +99,8 @@ tmp=
 trap 'test -z "$tmp" || rm -fr "$tmp"' 0 1 2 13 15
 
 set_cc_for_build() {
+    # prevent multiple calls if $tmp is already set
+    test "$tmp" && return 0
     : "${TMPDIR=/tmp}"
     # shellcheck disable=SC2039
     { tmp=`(umask 077 && mktemp -d "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
@@ -262,6 +264,9 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
     *:SolidBSD:*:*)
 	echo "$UNAME_MACHINE"-unknown-solidbsd"$UNAME_RELEASE"
 	exit ;;
+    *:OS108:*:*)
+	echo "$UNAME_MACHINE"-unknown-os108_"$UNAME_RELEASE"
+	exit ;;
     macppc:MirBSD:*:*)
 	echo powerpc-unknown-mirbsd"$UNAME_RELEASE"
 	exit ;;
@@ -271,6 +276,9 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
     *:Sortix:*:*)
 	echo "$UNAME_MACHINE"-unknown-sortix
 	exit ;;
+    *:Twizzler:*:*)
+	echo "$UNAME_MACHINE"-unknown-twizzler
+	exit ;;
     *:Redox:*:*)
 	echo "$UNAME_MACHINE"-unknown-redox
 	exit ;;
@@ -918,7 +926,7 @@ EOF
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
 	exit ;;
     alpha:Linux:*:*)
-	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
+	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' /proc/cpuinfo 2>/dev/null` in
 	  EV5)   UNAME_MACHINE=alphaev5 ;;
 	  EV56)  UNAME_MACHINE=alphaev56 ;;
 	  PCA56) UNAME_MACHINE=alphapca56 ;;
@@ -1325,12 +1333,19 @@ EOF
 	echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
 	exit ;;
     *:Darwin:*:*)
-	UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
+	UNAME_PROCESSOR=`uname -p`
+	case $UNAME_PROCESSOR in
+	    unknown) UNAME_PROCESSOR=powerpc ;;
+	esac
+	if command -v xcode-select > /dev/null 2> /dev/null && \
+		! xcode-select --print-path > /dev/null 2> /dev/null ; then
+	    # Avoid executing cc if there is no toolchain installed as
+	    # cc will be a stub that puts up a graphical alert
+	    # prompting the user to install developer tools.
+	    CC_FOR_BUILD=no_compiler_found
+	else
 	    set_cc_for_build
-	if test "$UNAME_PROCESSOR" = unknown ; then
-	    UNAME_PROCESSOR=powerpc
 	fi
-	if test "`echo "$UNAME_RELEASE" | sed -e 's/\..*//'`" -le 10 ; then
 	if [ "$CC_FOR_BUILD" != no_compiler_found ]; then
 	    if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
 		   (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
@@ -1348,15 +1363,9 @@ EOF
 	    then
 		UNAME_PROCESSOR=powerpc
 	    fi
-	    fi
 	elif test "$UNAME_PROCESSOR" = i386 ; then
-	    # Avoid executing cc on OS X 10.9, as it ships with a stub
-	    # that puts up a graphical alert prompting to install
-	    # developer tools.  Any system running Mac OS X 10.7 or
-	    # later (Darwin 11 and later) is required to have a 64-bit
-	    # processor. This is not true of the ARM version of Darwin
-	    # that Apple uses in portable devices.
-	    UNAME_PROCESSOR=x86_64
+	    # uname -m returns i386 or x86_64
+	    UNAME_PROCESSOR=$UNAME_MACHINE
 	fi
 	echo "$UNAME_PROCESSOR"-apple-darwin"$UNAME_RELEASE"
 	exit ;;
@@ -1468,6 +1477,14 @@ cat > "$dummy.c" <<EOF
 #include <sys/types.h>
 #include <sys/utsname.h>
 #endif
+#if defined(ultrix) || defined(_ultrix) || defined(__ultrix) || defined(__ultrix__)
+#if defined (vax) || defined (__vax) || defined (__vax__) || defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)
+#include <signal.h>
+#if defined(_SIZE_T_) || defined(SIGLOST)
+#include <sys/utsname.h>
+#endif
+#endif
+#endif
 main ()
 {
 #if defined (sony)
@@ -1554,19 +1571,24 @@ main ()
 #else
   printf ("vax-dec-bsd\n"); exit (0);
 #endif
+#else
+#if defined(_SIZE_T_) || defined(SIGLOST)
+  struct utsname un;
+  uname (&un);
+  printf ("vax-dec-ultrix%s\n", un.release); exit (0);
 #else
   printf ("vax-dec-ultrix\n"); exit (0);
 #endif
 #endif
+#endif
 #if defined(ultrix) || defined(_ultrix) || defined(__ultrix) || defined(__ultrix__)
 #if defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)
-#include <signal.h>
-#if defined(_SIZE_T_) /* >= ULTRIX4 */
-  printf ("mips-dec-ultrix4\n"); exit (0);
+#if defined(_SIZE_T_) || defined(SIGLOST)
+  struct utsname *un;
+  uname (&un);
+  printf ("mips-dec-ultrix%s\n", un.release); exit (0);
 #else
-#if defined(ULTRIX3) || defined(ultrix3) || defined(SIGLOST)
-  printf ("mips-dec-ultrix3\n"); exit (0);
-#endif
+  printf ("mips-dec-ultrix\n"); exit (0);
 #endif
 #endif
 #endif

deps/libev/config.h.in

@@ -24,12 +24,21 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if linux/fs.h defined kernel_rwf_t */
+#undef HAVE_KERNEL_RWF_T
+
 /* Define to 1 if you have the `kqueue' function. */
 #undef HAVE_KQUEUE
 
 /* Define to 1 if you have the `rt' library (-lrt). */
 #undef HAVE_LIBRT
 
+/* Define to 1 if you have the <linux/aio_abi.h> header file. */
+#undef HAVE_LINUX_AIO_ABI_H
+
+/* Define to 1 if you have the <linux/fs.h> header file. */
+#undef HAVE_LINUX_FS_H
+
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
@@ -87,6 +96,9 @@
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H
 
+/* Define to 1 if you have the <sys/timerfd.h> header file. */
+#undef HAVE_SYS_TIMERFD_H
+
 /* Define to 1 if you have the <sys/types.h> header file. */
 #undef HAVE_SYS_TYPES_H
 

deps/libev/config.sub

 #! /bin/sh
 # Configuration validation subroutine script.
-#   Copyright 1992-2019 Free Software Foundation, Inc.
+#   Copyright 1992-2020 Free Software Foundation, Inc.
 
-timestamp='2019-01-05'
+timestamp='2020-01-01'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -67,7 +67,7 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)
 
-Copyright 1992-2019 Free Software Foundation, Inc.
+Copyright 1992-2020 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -337,17 +337,14 @@ case $1 in
 				basic_machine=m88k-harris
 				os=sysv3
 				;;
-			hp300)
+			hp300 | hp300hpux)
 				basic_machine=m68k-hp
+				os=hpux
 				;;
 			hp300bsd)
 				basic_machine=m68k-hp
 				os=bsd
 				;;
-			hp300hpux)
-				basic_machine=m68k-hp
-				os=hpux
-				;;
 			hppaosf)
 				basic_machine=hppa1.1-hp
 				os=osf
@@ -360,10 +357,6 @@ case $1 in
 				basic_machine=i386-mach
 				os=mach
 				;;
-			vsta)
-				basic_machine=i386-pc
-				os=vsta
-				;;
 			isi68 | isi)
 				basic_machine=m68k-isi
 				os=sysv
@@ -612,6 +605,10 @@ case $1 in
 				basic_machine=vax-dec
 				os=vms
 				;;
+			vsta)
+				basic_machine=i386-pc
+				os=vsta
+				;;
 			vxworks960)
 				basic_machine=i960-wrs
 				os=vxworks
@@ -1172,7 +1169,7 @@ case $cpu-$vendor in
 			| asmjs \
 			| ba \
 			| be32 | be64 \
-			| bfin | bs2000 \
+			| bfin | bpf | bs2000 \
 			| c[123]* | c30 | [cjt]90 | c4x \
 			| c8051 | clipper | craynv | csky | cydra \
 			| d10v | d30v | dlx | dsp16xx \
@@ -1346,11 +1343,11 @@ case $os in
 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
 	     | sym* | kopensolaris* | plan9* \
 	     | amigaos* | amigados* | msdos* | newsos* | unicos* | aof* \
-	     | aos* | aros* | cloudabi* | sortix* \
+	     | aos* | aros* | cloudabi* | sortix* | twizzler* \
 	     | nindy* | vxsim* | vxworks* | ebmon* | hms* | mvs* \
 	     | clix* | riscos* | uniplus* | iris* | isc* | rtu* | xenix* \
 	     | knetbsd* | mirbsd* | netbsd* \
-	     | bitrig* | openbsd* | solidbsd* | libertybsd* \
+	     | bitrig* | openbsd* | solidbsd* | libertybsd* | os108* \
 	     | ekkobsd* | kfreebsd* | freebsd* | riscix* | lynxos* \
 	     | bosx* | nextstep* | cxux* | aout* | elf* | oabi* \
 	     | ptx* | coff* | ecoff* | winnt* | domain* | vsta* \
@@ -1368,7 +1365,8 @@ case $os in
 	     | powermax* | dnix* | nx6 | nx7 | sei* | dragonfly* \
 	     | skyos* | haiku* | rdos* | toppers* | drops* | es* \
 	     | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
-	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi*)
+	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
+	     | nsk* | powerunix)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	qnx*)
@@ -1452,9 +1450,6 @@ case $os in
 	ns2)
 		os=nextstep2
 		;;
-	nsk*)
-		os=nsk
-		;;
 	# Preserve the version number of sinix5.
 	sinix5.*)
 		os=`echo $os | sed -e 's|sinix|sysv|'`

deps/libev/depcomp

 #! /bin/sh
 # depcomp - compile a program generating dependencies as side-effects
 
-scriptversion=2013-05-30.07; # UTC
+scriptversion=2018-03-07.03; # UTC
 
-# Copyright (C) 1999-2014 Free Software Foundation, Inc.
+# Copyright (C) 1999-2018 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@ scriptversion=2013-05-30.07; # UTC
 # GNU General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -783,9 +783,9 @@ exit 0
 # Local Variables:
 # mode: shell-script
 # sh-indentation: 2
-# eval: (add-hook 'write-file-hooks 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-time-zone: "UTC"
+# time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

deps/libev/ev.h

 /*
  * libev native API header
  *
- * Copyright (c) 2007-2018 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007-2019 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
@@ -151,7 +151,10 @@ EV_CPP(extern "C" {)
 
 /*****************************************************************************/
 
-typedef double ev_tstamp;
+#ifndef EV_TSTAMP_T
+# define EV_TSTAMP_T double
+#endif
+typedef EV_TSTAMP_T ev_tstamp;
 
 #include <string.h> /* for memmove */
 
@@ -212,7 +215,7 @@ struct ev_loop;
 /*****************************************************************************/
 
 #define EV_VERSION_MAJOR 4
-#define EV_VERSION_MINOR 25
+#define EV_VERSION_MINOR 31
 
 /* eventmask, revents, events... */
 enum {
@@ -511,7 +514,8 @@ enum {
   EVFLAG_NOSIGFD    = 0, /* compatibility to pre-3.9 */
 #endif
   EVFLAG_SIGNALFD   = 0x00200000U, /* attempt to use signalfd */
-  EVFLAG_NOSIGMASK = 0x00400000U  /* avoid modifying the signal mask */
+  EVFLAG_NOSIGMASK  = 0x00400000U, /* avoid modifying the signal mask */
+  EVFLAG_NOTIMERFD  = 0x00800000U  /* avoid creating a timerfd */
 };
 
 /* method bits to be ored together */
@@ -522,7 +526,9 @@ enum {
   EVBACKEND_KQUEUE   = 0x00000008U, /* bsd, broken on osx */
   EVBACKEND_DEVPOLL  = 0x00000010U, /* solaris 8 */ /* NYI */
   EVBACKEND_PORT     = 0x00000020U, /* solaris 10 */
-  EVBACKEND_ALL     = 0x0000003FU, /* all known backends */
+  EVBACKEND_LINUXAIO = 0x00000040U, /* linuix AIO, 4.19+ */
+  EVBACKEND_IOURING  = 0x00000080U, /* linux io_uring, 5.1+ */
+  EVBACKEND_ALL      = 0x000000FFU, /* all known backends */
   EVBACKEND_MASK     = 0x0000FFFFU  /* all future backends */
 };
 

deps/libev/ev_epoll.c

 /*
  * libev epoll fd activity backend
  *
- * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007,2008,2009,2010,2011,2016,2017,2019 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
@@ -93,10 +93,10 @@ epoll_modify (EV_P_ int fd, int oev, int nev)
   ev.events   = (nev & EV_READ  ? EPOLLIN  : 0)
               | (nev & EV_WRITE ? EPOLLOUT : 0);
 
-  if (expect_true (!epoll_ctl (backend_fd, oev && oldmask != nev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd, &ev)))
+  if (ecb_expect_true (!epoll_ctl (backend_fd, oev && oldmask != nev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd, &ev)))
     return;
 
-  if (expect_true (errno == ENOENT))
+  if (ecb_expect_true (errno == ENOENT))
     {
       /* if ENOENT then the fd went away, so try to do the right thing */
       if (!nev)
@@ -105,7 +105,7 @@ epoll_modify (EV_P_ int fd, int oev, int nev)
       if (!epoll_ctl (backend_fd, EPOLL_CTL_ADD, fd, &ev))
         return;
     }
-  else if (expect_true (errno == EEXIST))
+  else if (ecb_expect_true (errno == EEXIST))
     {
       /* EEXIST means we ignored a previous DEL, but the fd is still active */
       /* if the kernel mask is the same as the new mask, we assume it hasn't changed */
@@ -115,7 +115,7 @@ epoll_modify (EV_P_ int fd, int oev, int nev)
       if (!epoll_ctl (backend_fd, EPOLL_CTL_MOD, fd, &ev))
         return;
     }
-  else if (expect_true (errno == EPERM))
+  else if (ecb_expect_true (errno == EPERM))
     {
       /* EPERM means the fd is always ready, but epoll is too snobbish */
       /* to handle it, unlike select or poll. */
@@ -124,12 +124,14 @@ epoll_modify (EV_P_ int fd, int oev, int nev)
       /* add fd to epoll_eperms, if not already inside */
       if (!(oldmask & EV_EMASK_EPERM))
         {
-          array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, EMPTY2);
+          array_needsize (int, epoll_eperms, epoll_epermmax, epoll_epermcnt + 1, array_needsize_noinit);
           epoll_eperms [epoll_epermcnt++] = fd;
         }
 
       return;
     }
+  else
+    assert (("libev: I/O watcher with invalid fd found in epoll_ctl", errno != EBADF && errno != ELOOP && errno != EINVAL));
 
   fd_kill (EV_A_ fd);
 
@@ -144,16 +146,16 @@ epoll_poll (EV_P_ ev_tstamp timeout)
   int i;
   int eventcnt;
 
-  if (expect_false (epoll_epermcnt))
-    timeout = 0.;
+  if (ecb_expect_false (epoll_epermcnt))
+    timeout = EV_TS_CONST (0.);
 
   /* epoll wait times cannot be larger than (LONG_MAX - 999UL) / HZ msecs, which is below */
   /* the default libev max wait time, however. */
   EV_RELEASE_CB;
-  eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, timeout * 1e3);
+  eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, EV_TS_TO_MSEC (timeout));
   EV_ACQUIRE_CB;
 
-  if (expect_false (eventcnt < 0))
+  if (ecb_expect_false (eventcnt < 0))
     {
       if (errno != EINTR)
         ev_syserr ("(libev) epoll_wait");
@@ -176,14 +178,14 @@ epoll_poll (EV_P_ ev_tstamp timeout)
        * other spurious notifications will be found by epoll_ctl, below
        * we assume that fd is always in range, as we never shrink the anfds array
        */
-      if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32)))
+      if (ecb_expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32)))
         {
           /* recreate kernel state */
           postfork |= 2;
           continue;
         }
 
-      if (expect_false (got & ~want))
+      if (ecb_expect_false (got & ~want))
         {
           anfds [fd].emask = want;
 
@@ -195,6 +197,8 @@ epoll_poll (EV_P_ ev_tstamp timeout)
            * above with the gencounter check (== our fd is not the event fd), and
            * partially here, when epoll_ctl returns an error (== a child has the fd
            * but we closed it).
+           * note: for events such as POLLHUP, where we can't know whether it refers
+           * to EV_READ or EV_WRITE, we might issue redundant EPOLL_CTL_MOD calls.
            */
           ev->events = (want & EV_READ  ? EPOLLIN  : 0)
                      | (want & EV_WRITE ? EPOLLOUT : 0);
@@ -212,7 +216,7 @@ epoll_poll (EV_P_ ev_tstamp timeout)
     }
 
   /* if the receive array was full, increase its size */
-  if (expect_false (eventcnt == epoll_eventmax))
+  if (ecb_expect_false (eventcnt == epoll_eventmax))
     {
       ev_free (epoll_events);
       epoll_eventmax = array_nextsize (sizeof (struct epoll_event), epoll_eventmax, epoll_eventmax + 1);
@@ -235,23 +239,34 @@ epoll_poll (EV_P_ ev_tstamp timeout)
     }
 }
 
-inline_size
-int
-epoll_init (EV_P_ int flags)
+static int
+epoll_epoll_create (void)
 {
+  int fd;
+
 #if defined EPOLL_CLOEXEC && !defined __ANDROID__
-  backend_fd = epoll_create1 (EPOLL_CLOEXEC);
+  fd = epoll_create1 (EPOLL_CLOEXEC);
 
-  if (backend_fd < 0 && (errno == EINVAL || errno == ENOSYS))
+  if (fd < 0 && (errno == EINVAL || errno == ENOSYS))
 #endif
-    backend_fd = epoll_create (256);
+    {
+      fd = epoll_create (256);
 
-  if (backend_fd < 0)
-    return 0;
+      if (fd >= 0)
+        fcntl (fd, F_SETFD, FD_CLOEXEC);
+    }
 
-  fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
+  return fd;
+}
 
-  backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */
+inline_size
+int
+epoll_init (EV_P_ int flags)
+{
+  if ((backend_fd = epoll_epoll_create ()) < 0)
+    return 0;
+
+  backend_mintime = EV_TS_CONST (1e-3); /* epoll does sometimes return early, this is just to avoid the worst */
   backend_modify  = epoll_modify;
   backend_poll    = epoll_poll;
 
@@ -269,17 +284,15 @@ epoll_destroy (EV_P)
   array_free (epoll_eperm, EMPTY);
 }
 
-inline_size
-void
+ecb_cold
+static void
 epoll_fork (EV_P)
 {
   close (backend_fd);
 
-  while ((backend_fd = epoll_create (256)) < 0)
+  while ((backend_fd = epoll_epoll_create ()) < 0)
     ev_syserr ("(libev) epoll_create");
 
-  fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
-
   fd_rearm_all (EV_A);
 }
 

deps/libev/ev_kqueue.c

 /*
  * libev kqueue backend
  *
- * Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007,2008,2009,2010,2011,2012,2013,2016,2019 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
@@ -48,7 +48,7 @@ void
 kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 {
   ++kqueue_changecnt;
-  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
+  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, array_needsize_noinit);
 
   EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
 }
@@ -103,10 +103,10 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
   EV_ACQUIRE_CB;
   kqueue_changecnt = 0;
 
-  if (expect_false (res < 0))
+  if (ecb_expect_false (res < 0))
     {
       if (errno != EINTR)
-        ev_syserr ("(libev) kevent");
+        ev_syserr ("(libev) kqueue kevent");
 
       return;
     }
@@ -115,7 +115,7 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
     {
       int fd = kqueue_events [i].ident;
 
-      if (expect_false (kqueue_events [i].flags & EV_ERROR))
+      if (ecb_expect_false (kqueue_events [i].flags & EV_ERROR))
         {
           int err = kqueue_events [i].data;
 
@@ -129,12 +129,18 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
                   if (fd_valid (fd))
                     kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
                   else
+                    {
+                      assert (("libev: kqueue found invalid fd", 0));
                       fd_kill (EV_A_ fd);
                     }
+                }
               else /* on all other errors, we error out on the fd */
+                {
+                  assert (("libev: kqueue found invalid fd", 0));
                   fd_kill (EV_A_ fd);
                 }
             }
+        }
       else
         fd_event (
           EV_A_
@@ -145,7 +151,7 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
         );
     }
 
-  if (expect_false (res == kqueue_eventmax))
+  if (ecb_expect_false (res == kqueue_eventmax))
     {
       ev_free (kqueue_events);
       kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
@@ -164,7 +170,7 @@ kqueue_init (EV_P_ int flags)
 
   fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
 
-  backend_mintime = 1e-9; /* apparently, they did the right thing in freebsd */
+  backend_mintime = EV_TS_CONST (1e-9); /* apparently, they did the right thing in freebsd */
   backend_modify  = kqueue_modify;
   backend_poll    = kqueue_poll;
 

deps/libev/ev_port.c

 /*
  * libev solaris event port backend
  *
- * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007,2008,2009,2010,2011,2019 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
@@ -69,7 +69,10 @@ port_associate_and_check (EV_P_ int fd, int ev)
   )
     {
       if (errno == EBADFD)
+        {
+          assert (("libev: port_associate found invalid fd", errno != EBADFD));
           fd_kill (EV_A_ fd);
+        }
       else
         ev_syserr ("(libev) port_associate");
     }
@@ -129,7 +132,7 @@ port_poll (EV_P_ ev_tstamp timeout)
         }
     }
 
-  if (expect_false (nget == port_eventmax))
+  if (ecb_expect_false (nget == port_eventmax))
     {
       ev_free (port_events);
       port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
@@ -151,11 +154,11 @@ port_init (EV_P_ int flags)
 
   /* if my reading of the opensolaris kernel sources are correct, then
    * opensolaris does something very stupid: it checks if the time has already
-   * elapsed and doesn't round up if that is the case,m otherwise it DOES round
+   * elapsed and doesn't round up if that is the case, otherwise it DOES round
    * up. Since we can't know what the case is, we need to guess by using a
    * "large enough" timeout. Normally, 1e-9 would be correct.
    */
-  backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
+  backend_mintime = EV_TS_CONST (1e-3); /* needed to compensate for port_getn returning early */
   backend_modify  = port_modify;
   backend_poll    = port_poll;