Import Gnulib modules: link, fsync, readlink, rename, mkdir, rmdir, unistd.

* lib/fsync.c:
* lib/link.c:
* lib/mkdir.c:
* lib/strdup.c:
* m4/fsync.m4:
* m4/link.m4:
* m4/mkdir.m4:
* m4/strdup.m4: New files.

* lib/Makefile.am
* m4/gnulib-cache.m4
* m4/gnulib-comp.m4: Add modules.

6 files changed, 217 insertions, 1 deletions

diff --git a/m4/fsync.m4 b/m4/fsync.m4
new file mode 100644
index 000000000..888a65def
--- /dev/null
+++ b/m4/fsync.m4
@@ -0,0 +1,17 @@
+# fsync.m4 serial 2
+dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_FSYNC],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([fsync])
+  if test $ac_cv_func_fsync = no; then
+    HAVE_FSYNC=0
+  fi
+])
+
+# Prerequisites of lib/fsync.c.
+AC_DEFUN([gl_PREREQ_FSYNC], [:])
diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4
index 3c3c65d85..fc7391cda 100644
--- a/m4/gnulib-cache.m4
+++ b/m4/gnulib-cache.m4
@@ -27,7 +27,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --no-conditional-dependencies --libtool --macro-prefix=gl --no-vc-files accept alignof alloca-opt announce-gen autobuild bind byteswap c-strcase canonicalize-lgpl ceil clock-time close connect copysign dirfd duplocale environ extensions flock floor fpieee frexp fstat full-read full-write func gendocs getaddrinfo getlogin getpeername getsockname getsockopt git-version-gen gitlog-to-changelog gnu-web-doc-update gnupload havelib iconv_open-utf inet_ntop inet_pton isfinite isinf isnan ldexp lib-symbol-versions lib-symbol-visibility libunistring listen localcharset locale log1p lstat maintainer-makefile malloc-gnu malloca mkstemp nl_langinfo nproc open pipe-posix pipe2 poll putenv recv recvfrom regex rename select send sendto setenv setsockopt shutdown socket stat-time stdlib strftime striconveh string sys_stat time times trunc verify vsnprintf warnings wchar
+#   gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --no-conditional-dependencies --libtool --macro-prefix=gl --no-vc-files accept alignof alloca-opt announce-gen autobuild bind byteswap c-strcase canonicalize-lgpl ceil clock-time close connect copysign dirfd duplocale environ extensions flock floor fpieee frexp fstat fsync full-read full-write func gendocs getaddrinfo getlogin getpeername getsockname getsockopt git-version-gen gitlog-to-changelog gnu-web-doc-update gnupload havelib iconv_open-utf inet_ntop inet_pton isfinite isinf isnan ldexp lib-symbol-versions lib-symbol-visibility libunistring link listen localcharset locale log1p lstat maintainer-makefile malloc-gnu malloca mkdir mkstemp nl_langinfo nproc open pipe-posix pipe2 poll putenv readlink recv recvfrom regex rename rmdir select send sendto setenv setsockopt shutdown socket stat-time stdlib strftime striconveh string sys_stat time times trunc unistd verify vsnprintf warnings wchar
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([gnulib-local])
@@ -55,6 +55,7 @@ gl_MODULES([
   fpieee
   frexp
   fstat
+  fsync
   full-read
   full-write
   func
@@ -79,6 +80,7 @@ gl_MODULES([
   lib-symbol-versions
   lib-symbol-visibility
   libunistring
+  link
   listen
   localcharset
   locale
@@ -87,6 +89,7 @@ gl_MODULES([
   maintainer-makefile
   malloc-gnu
   malloca
+  mkdir
   mkstemp
   nl_langinfo
   nproc
@@ -95,10 +98,12 @@ gl_MODULES([
   pipe2
   poll
   putenv
+  readlink
   recv
   recvfrom
   regex
   rename
+  rmdir
   select
   send
   sendto
@@ -115,6 +120,7 @@ gl_MODULES([
   time
   times
   trunc
+  unistd
   verify
   vsnprintf
   warnings
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 74a51f79e..b333d6aed 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -84,6 +84,7 @@ AC_DEFUN([gl_EARLY],
   AC_REQUIRE([gl_FP_IEEE])
   # Code from module frexp:
   # Code from module fstat:
+  # Code from module fsync:
   # Code from module full-read:
   # Code from module full-write:
   # Code from module func:
@@ -127,6 +128,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module lib-symbol-versions:
   # Code from module lib-symbol-visibility:
   # Code from module libunistring:
+  # Code from module link:
   # Code from module listen:
   # Code from module localcharset:
   # Code from module locale:
@@ -144,6 +146,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module mbsinit:
   # Code from module mbtowc:
   # Code from module memchr:
+  # Code from module mkdir:
   # Code from module mkstemp:
   # Code from module msvc-inval:
   # Code from module msvc-nothrow:
@@ -202,6 +205,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module stdint:
   # Code from module stdio:
   # Code from module stdlib:
+  # Code from module strdup-posix:
   # Code from module streq:
   # Code from module strftime:
   # Code from module striconveh:
@@ -365,6 +369,12 @@ AC_SUBST([LTALLOCA])
     gl_PREREQ_FSTAT
   fi
   gl_SYS_STAT_MODULE_INDICATOR([fstat])
+  gl_FUNC_FSYNC
+  if test $HAVE_FSYNC = 0; then
+    AC_LIBOBJ([fsync])
+    gl_PREREQ_FSYNC
+  fi
+  gl_UNISTD_MODULE_INDICATOR([fsync])
   gl_FUNC
   gl_GETADDRINFO
   if test $HAVE_GETADDRINFO = 0; then
@@ -499,6 +509,11 @@ AC_SUBST([LTALLOCA])
   gl_LD_VERSION_SCRIPT
   gl_VISIBILITY
   gl_LIBUNISTRING
+  gl_FUNC_LINK
+  if test $HAVE_LINK = 0 || test $REPLACE_LINK = 1; then
+    AC_LIBOBJ([link])
+  fi
+  gl_UNISTD_MODULE_INDICATOR([link])
   AC_REQUIRE([gl_HEADER_SYS_SOCKET])
   if test "$ac_cv_header_winsock2_h" = yes; then
     AC_LIBOBJ([listen])
@@ -570,6 +585,10 @@ AC_SUBST([LTALLOCA])
     gl_PREREQ_MEMCHR
   fi
   gl_STRING_MODULE_INDICATOR([memchr])
+  gl_FUNC_MKDIR
+  if test $REPLACE_MKDIR = 1; then
+    AC_LIBOBJ([mkdir])
+  fi
   gl_FUNC_MKSTEMP
   if test $HAVE_MKSTEMP = 0 || test $REPLACE_MKSTEMP = 1; then
     AC_LIBOBJ([mkstemp])
@@ -752,6 +771,12 @@ AC_SUBST([LTALLOCA])
   gl_STDINT_H
   gl_STDIO_H
   gl_STDLIB_H
+  gl_FUNC_STRDUP_POSIX
+  if test $ac_cv_func_strdup = no || test $REPLACE_STRDUP = 1; then
+    AC_LIBOBJ([strdup])
+    gl_PREREQ_STRDUP
+  fi
+  gl_STRING_MODULE_INDICATOR([strdup])
   gl_FUNC_GNU_STRFTIME
   if test $gl_cond_libtool = false; then
     gl_ltlibdeps="$gl_ltlibdeps $LTLIBICONV"
@@ -1016,6 +1041,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/floor.c
   lib/frexp.c
   lib/fstat.c
+  lib/fsync.c
   lib/full-read.c
   lib/full-read.h
   lib/full-write.c
@@ -1055,6 +1081,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/itold.c
   lib/langinfo.in.h
   lib/libunistring.valgrind
+  lib/link.c
   lib/listen.c
   lib/localcharset.c
   lib/localcharset.h
@@ -1075,6 +1102,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/mbtowc.c
   lib/memchr.c
   lib/memchr.valgrind
+  lib/mkdir.c
   lib/mkstemp.c
   lib/msvc-inval.c
   lib/msvc-inval.h
@@ -1142,6 +1170,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/stdint.in.h
   lib/stdio.in.h
   lib/stdlib.in.h
+  lib/strdup.c
   lib/streq.h
   lib/strftime.c
   lib/strftime.h
@@ -1225,6 +1254,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/fpieee.m4
   m4/frexp.m4
   m4/fstat.m4
+  m4/fsync.m4
   m4/func.m4
   m4/getaddrinfo.m4
   m4/getlogin.m4
@@ -1257,6 +1287,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/lib-prefix.m4
   m4/libunistring-base.m4
   m4/libunistring.m4
+  m4/link.m4
   m4/localcharset.m4
   m4/locale-fr.m4
   m4/locale-ja.m4
@@ -1277,6 +1308,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/mbstate_t.m4
   m4/mbtowc.m4
   m4/memchr.m4
+  m4/mkdir.m4
   m4/mkstemp.m4
   m4/mmap-anon.m4
   m4/mode_t.m4
@@ -1328,6 +1360,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/stdint_h.m4
   m4/stdio_h.m4
   m4/stdlib_h.m4
+  m4/strdup.m4
   m4/strftime.m4
   m4/string_h.m4
   m4/sys_file_h.m4
diff --git a/m4/link.m4 b/m4/link.m4
new file mode 100644
index 000000000..e923d0d02
--- /dev/null
+++ b/m4/link.m4
@@ -0,0 +1,55 @@
+# link.m4 serial 8
+dnl Copyright (C) 2009-2014 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_LINK],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_CHECK_FUNCS_ONCE([link])
+  if test $ac_cv_func_link = no; then
+    HAVE_LINK=0
+  else
+    AC_CACHE_CHECK([whether link obeys POSIX],
+      [gl_cv_func_link_works],
+      [touch conftest.a
+       # Assume that if we have lstat, we can also check symlinks.
+       if test $ac_cv_func_lstat = yes; then
+         ln -s conftest.a conftest.lnk
+       fi
+       AC_RUN_IFELSE(
+         [AC_LANG_PROGRAM(
+           [[#include <unistd.h>
+           ]],
+           [[int result = 0;
+             if (!link ("conftest.a", "conftest.b/"))
+               result |= 1;
+#if HAVE_LSTAT
+             if (!link ("conftest.lnk/", "conftest.b"))
+               result |= 2;
+             if (rename ("conftest.a", "conftest.b"))
+               result |= 4;
+             if (!link ("conftest.b", "conftest.lnk"))
+               result |= 8;
+#endif
+             return result;
+           ]])],
+         [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
+         [case "$host_os" in
+                    # Guess yes on glibc systems.
+            *-gnu*) gl_cv_func_link_works="guessing yes" ;;
+                    # If we don't know, assume the worst.
+            *)      gl_cv_func_link_works="guessing no" ;;
+          esac
+         ])
+       rm -f conftest.a conftest.b conftest.lnk])
+    case "$gl_cv_func_link_works" in
+      *yes) ;;
+      *)
+        REPLACE_LINK=1
+        ;;
+    esac
+  fi
+])
diff --git a/m4/mkdir.m4 b/m4/mkdir.m4
new file mode 100644
index 000000000..51e78c13d
--- /dev/null
+++ b/m4/mkdir.m4
@@ -0,0 +1,69 @@
+# serial 11
+
+# Copyright (C) 2001, 2003-2004, 2006, 2008-2014 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# On some systems, mkdir ("foo/", 0700) fails because of the trailing slash.
+# On others, mkdir ("foo/./", 0700) mistakenly succeeds.
+# On such systems, arrange to use a wrapper function.
+AC_DEFUN([gl_FUNC_MKDIR],
+[dnl
+  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_CHECK_HEADERS_ONCE([unistd.h])
+  AC_CACHE_CHECK([whether mkdir handles trailing slash],
+    [gl_cv_func_mkdir_trailing_slash_works],
+    [rm -rf conftest.dir
+      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#       include <sys/types.h>
+#       include <sys/stat.h>
+]], [return mkdir ("conftest.dir/", 0700);])],
+      [gl_cv_func_mkdir_trailing_slash_works=yes],
+      [gl_cv_func_mkdir_trailing_slash_works=no],
+      [case "$host_os" in
+                 # Guess yes on glibc systems.
+         *-gnu*) gl_cv_func_mkdir_trailing_slash_works="guessing yes" ;;
+                 # If we don't know, assume the worst.
+         *)      gl_cv_func_mkdir_trailing_slash_works="guessing no" ;;
+       esac
+      ])
+    rm -rf conftest.dir
+    ]
+  )
+  case "$gl_cv_func_mkdir_trailing_slash_works" in
+    *yes) ;;
+    *)
+      REPLACE_MKDIR=1
+      ;;
+  esac
+
+  AC_CACHE_CHECK([whether mkdir handles trailing dot],
+    [gl_cv_func_mkdir_trailing_dot_works],
+    [rm -rf conftest.dir
+      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#       include <sys/types.h>
+#       include <sys/stat.h>
+]], [return !mkdir ("conftest.dir/./", 0700);])],
+      [gl_cv_func_mkdir_trailing_dot_works=yes],
+      [gl_cv_func_mkdir_trailing_dot_works=no],
+      [case "$host_os" in
+                 # Guess yes on glibc systems.
+         *-gnu*) gl_cv_func_mkdir_trailing_dot_works="guessing yes" ;;
+                 # If we don't know, assume the worst.
+         *)      gl_cv_func_mkdir_trailing_dot_works="guessing no" ;;
+       esac
+      ])
+    rm -rf conftest.dir
+    ]
+  )
+  case "$gl_cv_func_mkdir_trailing_dot_works" in
+    *yes) ;;
+    *)
+      REPLACE_MKDIR=1
+      AC_DEFINE([FUNC_MKDIR_DOT_BUG], [1], [Define to 1 if mkdir mistakenly
+        creates a directory given with a trailing dot component.])
+      ;;
+  esac
+])
diff --git a/m4/strdup.m4 b/m4/strdup.m4
new file mode 100644
index 000000000..1681a30eb
--- /dev/null
+++ b/m4/strdup.m4
@@ -0,0 +1,36 @@
+# strdup.m4 serial 13
+
+dnl Copyright (C) 2002-2014 Free Software Foundation, Inc.
+
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_STRDUP],
+[
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([strdup])
+  AC_CHECK_DECLS_ONCE([strdup])
+  if test $ac_cv_have_decl_strdup = no; then
+    HAVE_DECL_STRDUP=0
+  fi
+])
+
+AC_DEFUN([gl_FUNC_STRDUP_POSIX],
+[
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
+  AC_CHECK_FUNCS_ONCE([strdup])
+  if test $ac_cv_func_strdup = yes; then
+    if test $gl_cv_func_malloc_posix != yes; then
+      REPLACE_STRDUP=1
+    fi
+  fi
+  AC_CHECK_DECLS_ONCE([strdup])
+  if test $ac_cv_have_decl_strdup = no; then
+    HAVE_DECL_STRDUP=0
+  fi
+])
+
+# Prerequisites of lib/strdup.c.
+AC_DEFUN([gl_PREREQ_STRDUP], [:])