diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile
index 11809b943fc3c3f5c9e02b5680ab4e9184b9bf62..1b602655554701a9f32950b7f4b28131709e700d 100644
--- a/Documentation/perf_counter/Makefile
+++ b/Documentation/perf_counter/Makefile
@@ -138,16 +138,6 @@ all::
 #
 # Define NO_PERL if you do not want Perl scripts or libraries at all.
 #
-# Define NO_TCLTK if you do not want Tcl/Tk GUI.
-#
-# The TCL_PATH variable governs the location of the Tcl interpreter
-# used to optimize perf-gui for your system.  Only used if NO_TCLTK
-# is not set.  Defaults to the bare 'tclsh'.
-#
-# The TCLTK_PATH variable governs the location of the Tcl/Tk interpreter.
-# If not set it defaults to the bare 'wish'. If it is set to the empty
-# string then NO_TCLTK will be forced (this is used by configure script).
-#
 # Define INTERNAL_QSORT to use Git's implementation of qsort(), which
 # is a simplified version of the merge sort used in glibc. This is
 # recommended if Git triggers O(n^2) behavior in your platform's qsort().
@@ -215,12 +205,8 @@ TAR = tar
 FIND = find
 INSTALL = install
 RPMBUILD = rpmbuild
-TCL_PATH = tclsh
-TCLTK_PATH = wish
 PTHREAD_LIBS = -lpthread
 
-export TCL_PATH TCLTK_PATH
-
 # sparse is architecture-neutral, which means that we need to tell it
 # explicitly what architecture to check for. Fix this up for yours..
 SPARSE_FLAGS = -D__BIG_ENDIAN__ -D__powerpc__
@@ -529,10 +515,6 @@ ifdef NO_EXTERNAL_GREP
 	BASIC_CFLAGS += -DNO_EXTERNAL_GREP
 endif
 
-ifeq ($(TCLTK_PATH),)
-NO_TCLTK=NoThanks
-endif
-
 ifeq ($(PERL_PATH),)
 NO_PERL=NoThanks
 endif
@@ -583,7 +565,6 @@ prefix_SQ = $(subst ','\'',$(prefix))
 
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
 PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
-TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
 
 LIBS = $(PERFLIBS) $(EXTLIBS)
 
@@ -607,14 +588,6 @@ ifneq (,$X)
 endif
 
 all::
-ifndef NO_TCLTK
-	$(QUIET_SUBDIR0)perf-gui $(QUIET_SUBDIR1) perfexecdir='$(perfexec_instdir_SQ)' all
-	$(QUIET_SUBDIR0)perfk-perf $(QUIET_SUBDIR1) all
-endif
-ifndef NO_PERL
-	$(QUIET_SUBDIR0)perl $(QUIET_SUBDIR1) PERL_PATH='$(PERL_PATH_SQ)' prefix='$(prefix_SQ)' all
-endif
-	$(QUIET_SUBDIR0)templates $(QUIET_SUBDIR1)
 
 please_set_SHELL_PATH_to_a_more_modern_shell:
 	@$$(:)
@@ -704,21 +677,6 @@ builtin-revert.o wt-status.o: wt-status.h
 $(LIB_FILE): $(LIB_OBJS)
 	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIB_OBJS)
 
-doc:
-	$(MAKE) -C Documentation all
-
-man:
-	$(MAKE) -C Documentation man
-
-html:
-	$(MAKE) -C Documentation html
-
-info:
-	$(MAKE) -C Documentation info
-
-pdf:
-	$(MAKE) -C Documentation pdf
-
 TAGS:
 	$(RM) TAGS
 	$(FIND) . -name '*.[hcS]' -print | xargs etags -a
@@ -751,33 +709,12 @@ PERF-BUILD-OPTIONS: .FORCE-PERF-BUILD-OPTIONS
 	@echo NO_CURL=\''$(subst ','\'',$(subst ','\'',$(NO_CURL)))'\' >>$@
 	@echo NO_PERL=\''$(subst ','\'',$(subst ','\'',$(NO_PERL)))'\' >>$@
 
-### Detect Tck/Tk interpreter path changes
-ifndef NO_TCLTK
-TRACK_VARS = $(subst ','\'',-DTCLTK_PATH='$(TCLTK_PATH_SQ)')
-
-PERF-GUI-VARS: .FORCE-PERF-GUI-VARS
-	@VARS='$(TRACK_VARS)'; \
-	    if test x"$$VARS" != x"`cat $@ 2>/dev/null`" ; then \
-		echo 1>&2 "    * new Tcl/Tk interpreter location"; \
-		echo "$$VARS" >$@; \
-            fi
-
-.PHONY: .FORCE-PERF-GUI-VARS
-endif
-
 ### Testing rules
 
-TEST_PROGRAMS += test-chmtime$X
-TEST_PROGRAMS += test-ctype$X
-TEST_PROGRAMS += test-date$X
-TEST_PROGRAMS += test-delta$X
-TEST_PROGRAMS += test-dump-cache-tree$X
-TEST_PROGRAMS += test-genrandom$X
-TEST_PROGRAMS += test-match-trees$X
-TEST_PROGRAMS += test-parse-options$X
-TEST_PROGRAMS += test-path-utils$X
-TEST_PROGRAMS += test-sha1$X
-TEST_PROGRAMS += test-sigchain$X
+#
+# None right now:
+#
+# TEST_PROGRAMS += test-something$X
 
 all:: $(TEST_PROGRAMS)
 
@@ -787,25 +724,6 @@ all:: $(TEST_PROGRAMS)
 
 export NO_SVN_TESTS
 
-test: all
-	$(MAKE) -C t/ all
-
-test-ctype$X: ctype.o
-
-test-date$X: date.o ctype.o
-
-test-delta$X: diff-delta.o patch-delta.o
-
-test-parse-options$X: parse-options.o
-
-.PRECIOUS: $(patsubst test-%$X,test-%.o,$(TEST_PROGRAMS))
-
-test-%$X: test-%.o $(PERFLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
-
-check-sha1:: test-sha1$X
-	./test-sha1.sh
-
 check: common-cmds.h
 	if sparse; \
 	then \
@@ -845,10 +763,6 @@ install: all
 	$(INSTALL) perf$X perf-upload-pack$X perf-receive-pack$X perf-upload-archive$X perf-shell$X perf-cvsserver '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(MAKE) -C templates DESTDIR='$(DESTDIR_SQ)' install
 	$(MAKE) -C perl prefix='$(prefix_SQ)' DESTDIR='$(DESTDIR_SQ)' install
-ifndef NO_TCLTK
-	$(MAKE) -C perfk-perf install
-	$(MAKE) -C perf-gui perfexecdir='$(perfexec_instdir_SQ)' install
-endif
 ifneq (,$X)
 	$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) perf$X)), $(RM) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/$p';)
 endif
@@ -865,32 +779,6 @@ endif
 	  done } && \
 	./check_bindir "z$$bindir" "z$$execdir" "$$bindir/perf-add$X"
 
-install-doc:
-	$(MAKE) -C Documentation install
-
-install-man:
-	$(MAKE) -C Documentation install-man
-
-install-html:
-	$(MAKE) -C Documentation install-html
-
-install-info:
-	$(MAKE) -C Documentation install-info
-
-install-pdf:
-	$(MAKE) -C Documentation install-pdf
-
-quick-install-doc:
-	$(MAKE) -C Documentation quick-install
-
-quick-install-man:
-	$(MAKE) -C Documentation quick-install-man
-
-quick-install-html:
-	$(MAKE) -C Documentation quick-install-html
-
-
-
 ### Maintainer's dist rules
 
 perf.spec: perf.spec.in
@@ -904,38 +792,16 @@ dist: perf.spec perf-archive$(X) configure
 	@mkdir -p $(PERF_TARNAME)
 	@cp perf.spec configure $(PERF_TARNAME)
 	@echo $(PERF_VERSION) > $(PERF_TARNAME)/version
-	@$(MAKE) -C perf-gui TARDIR=../$(PERF_TARNAME)/perf-gui dist-version
 	$(TAR) rf $(PERF_TARNAME).tar \
 		$(PERF_TARNAME)/perf.spec \
 		$(PERF_TARNAME)/configure \
-		$(PERF_TARNAME)/version \
-		$(PERF_TARNAME)/perf-gui/version
+		$(PERF_TARNAME)/version
 	@$(RM) -r $(PERF_TARNAME)
 	gzip -f -9 $(PERF_TARNAME).tar
 
 rpm: dist
 	$(RPMBUILD) -ta $(PERF_TARNAME).tar.gz
 
-htmldocs = perf-htmldocs-$(PERF_VERSION)
-manpages = perf-manpages-$(PERF_VERSION)
-dist-doc:
-	$(RM) -r .doc-tmp-dir
-	mkdir .doc-tmp-dir
-	$(MAKE) -C Documentation WEBDOC_DEST=../.doc-tmp-dir install-webdoc
-	cd .doc-tmp-dir && $(TAR) cf ../$(htmldocs).tar .
-	gzip -n -9 -f $(htmldocs).tar
-	:
-	$(RM) -r .doc-tmp-dir
-	mkdir -p .doc-tmp-dir/man1 .doc-tmp-dir/man5 .doc-tmp-dir/man7
-	$(MAKE) -C Documentation DESTDIR=./ \
-		man1dir=../.doc-tmp-dir/man1 \
-		man5dir=../.doc-tmp-dir/man5 \
-		man7dir=../.doc-tmp-dir/man7 \
-		install
-	cd .doc-tmp-dir && $(TAR) cf ../$(manpages).tar .
-	gzip -n -9 -f $(manpages).tar
-	$(RM) -r .doc-tmp-dir
-
 ### Cleaning rules
 
 distclean: clean
@@ -951,74 +817,13 @@ clean:
 	$(RM) -r $(PERF_TARNAME) .doc-tmp-dir
 	$(RM) $(PERF_TARNAME).tar.gz perf-core_$(PERF_VERSION)-*.tar.gz
 	$(RM) $(htmldocs).tar.gz $(manpages).tar.gz
-	$(MAKE) -C Documentation/ clean
-	$(MAKE) -C templates/ clean
-	$(MAKE) -C t/ clean
-ifndef NO_TCLTK
-	$(MAKE) -C perfk-perf clean
-	$(MAKE) -C perf-gui clean
-endif
-	$(RM) PERF-VERSION-FILE PERF-CFLAGS PERF-GUI-VARS PERF-BUILD-OPTIONS
+	$(RM) PERF-VERSION-FILE PERF-CFLAGS PERF-BUILD-OPTIONS
 
 .PHONY: all install clean strip
 .PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
 .PHONY: .FORCE-PERF-VERSION-FILE TAGS tags cscope .FORCE-PERF-CFLAGS
 .PHONY: .FORCE-PERF-BUILD-OPTIONS
 
-### Check documentation
-#
-check-docs::
-	@(for v in $(ALL_PROGRAMS) $(BUILT_INS) perf perfk; \
-	do \
-		case "$$v" in \
-		perf-merge-octopus | perf-merge-ours | perf-merge-recursive | \
-		perf-merge-resolve | perf-merge-subtree | \
-		perf-fsck-objects | perf-init-db | \
-		perf-?*--?* ) continue ;; \
-		esac ; \
-		test -f "Documentation/$$v.txt" || \
-		echo "no doc: $$v"; \
-		sed -e '/^#/d' command-list.txt | \
-		grep -q "^$$v[ 	]" || \
-		case "$$v" in \
-		perf) ;; \
-		*) echo "no link: $$v";; \
-		esac ; \
-	done; \
-	( \
-		sed -e '/^#/d' \
-		    -e 's/[ 	].*//' \
-		    -e 's/^/listed /' command-list.txt; \
-		ls -1 Documentation/perf*txt | \
-		sed -e 's|Documentation/|documented |' \
-		    -e 's/\.txt//'; \
-	) | while read how cmd; \
-	do \
-		case "$$how,$$cmd" in \
-		*,perf-citool | \
-		*,perf-gui | \
-		*,perf-help | \
-		documented,perfattributes | \
-		documented,perfignore | \
-		documented,perfmodules | \
-		documented,perfcli | \
-		documented,perf-tools | \
-		documented,perfcore-tutorial | \
-		documented,perfcvs-migration | \
-		documented,perfdiffcore | \
-		documented,perfglossary | \
-		documented,perfhooks | \
-		documented,perfrepository-layout | \
-		documented,perftutorial | \
-		documented,perftutorial-2 | \
-		sentinel,not,matching,is,ok ) continue ;; \
-		esac; \
-		case " $(ALL_PROGRAMS) $(BUILT_INS) perf perfk " in \
-		*" $$cmd "*)	;; \
-		*) echo "removed but $$how: $$cmd" ;; \
-		esac; \
-	done ) | sort
-
 ### Make sure built-ins do not have dups and listed in perf.c
 #
 check-builtins::
diff --git a/Documentation/perf_counter/builtin-help.c b/Documentation/perf_counter/builtin-help.c
index 125fcc2f4901d51cd6f2afd71bbc023862bdc2d5..a136d619db371a61e737c0629be232ff9f0348ce 100644
--- a/Documentation/perf_counter/builtin-help.c
+++ b/Documentation/perf_counter/builtin-help.c
@@ -417,11 +417,9 @@ static void show_html_page(const char *perf_cmd)
 
 int cmd_help(int argc, const char **argv, const char *prefix)
 {
-	int nonperf;
 	const char *alias;
 	load_command_list("perf-", &main_cmds, &other_cmds);
 
-	/* setup_perf_directory_gently(&nonperf); */
 	perf_config(perf_help_config, NULL);
 
 	argc = parse_options(argc, argv, builtin_help_options,
diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index 9d2c769e5f835547347bb653f2a3d5e7a514c57c..601bddbc30d5ff6be912254aa32c3035736328a3 100644
--- a/Documentation/perf_counter/builtin-top.c
+++ b/Documentation/perf_counter/builtin-top.c
@@ -63,15 +63,6 @@
 
 #include "util.h"
 
-#define _GNU_SOURCE
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <unistd.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
 #include <getopt.h>
 #include <assert.h>
 #include <fcntl.h>
@@ -103,8 +94,6 @@
 #define PR_TASK_PERF_COUNTERS_DISABLE   31
 #define PR_TASK_PERF_COUNTERS_ENABLE    32
 
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
 #define rdclock()                                       \
 ({                                                      \
         struct timespec ts;                             \
@@ -1077,7 +1066,7 @@ static void process_event(uint64_t ip, int counter)
 	record_ip(ip, counter);
 }
 
-static void process_options(int argc, char *argv[])
+static void process_options(int argc, char **argv)
 {
 	int error = 0, counter;
 
@@ -1255,7 +1244,7 @@ static void mmap_read(struct mmap_data *md)
 
 		event_t event_copy;
 
-		unsigned int size = event->header.size;
+		size_t size = event->header.size;
 
 		/*
 		 * Event straddles the mmap boundary -- header should always
@@ -1301,7 +1290,7 @@ static void mmap_read(struct mmap_data *md)
 	md->prev = old;
 }
 
-int cmd_top(int argc, const char **argv, const char *prefix)
+int cmd_top(int argc, char **argv, const char *prefix)
 {
 	struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
 	struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
diff --git a/Documentation/perf_counter/cache.h b/Documentation/perf_counter/cache.h
index dc085640a57d419730429edffb1d6d71260bf584..71080512fa8628a687ec8ca1d345cd086eb28065 100644
--- a/Documentation/perf_counter/cache.h
+++ b/Documentation/perf_counter/cache.h
@@ -94,4 +94,24 @@ static inline int is_absolute_path(const char *path)
 {
 	return path[0] == '/';
 }
+
+const char *make_absolute_path(const char *path);
+const char *make_nonrelative_path(const char *path);
+const char *make_relative_path(const char *abs, const char *base);
+int normalize_path_copy(char *dst, const char *src);
+int longest_ancestor_length(const char *path, const char *prefix_list);
+char *strip_path_suffix(const char *path, const char *suffix);
+
+extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
+extern char *perf_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
+
+extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
+	__attribute__((format (printf, 3, 4)));
+extern char *perf_snpath(char *buf, size_t n, const char *fmt, ...)
+	__attribute__((format (printf, 3, 4)));
+extern char *perf_pathdup(const char *fmt, ...)
+	__attribute__((format (printf, 1, 2)));
+
+extern size_t strlcpy(char *dest, const char *src, size_t size);
+
 #endif /* CACHE_H */
diff --git a/Documentation/perf_counter/config.c b/Documentation/perf_counter/config.c
index 672d53959334cf25548471db49d36fa689cd8a4f..3dd13faa6a27f9e1378184bd3349c2a3cf51f073 100644
--- a/Documentation/perf_counter/config.c
+++ b/Documentation/perf_counter/config.c
@@ -15,7 +15,6 @@ static FILE *config_file;
 static const char *config_file_name;
 static int config_linenr;
 static int config_file_eof;
-static int zlib_compression_seen;
 
 const char *config_exclusive_filename = NULL;
 
@@ -533,14 +532,6 @@ static int store_aux(const char* key, const char* value, void *cb)
 	return 0;
 }
 
-static int write_error(const char *filename)
-{
-	error("failed to write new configuration file %s", filename);
-
-	/* Same error code as "failed to rename". */
-	return 4;
-}
-
 static int store_write_section(int fd, const char* key)
 {
 	const char *dot;
@@ -673,7 +664,7 @@ int perf_config_set_multivar(const char* key, const char* value,
 {
 	int i, dot;
 	int fd = -1, in_fd;
-	int ret;
+	int ret = 0;
 	char* config_filename;
 	const char* last_dot = strrchr(key, '.');
 
@@ -872,90 +863,6 @@ int perf_config_set_multivar(const char* key, const char* value,
 
 }
 
-static int section_name_match (const char *buf, const char *name)
-{
-	int i = 0, j = 0, dot = 0;
-	for (; buf[i] && buf[i] != ']'; i++) {
-		if (!dot && isspace(buf[i])) {
-			dot = 1;
-			if (name[j++] != '.')
-				break;
-			for (i++; isspace(buf[i]); i++)
-				; /* do nothing */
-			if (buf[i] != '"')
-				break;
-			continue;
-		}
-		if (buf[i] == '\\' && dot)
-			i++;
-		else if (buf[i] == '"' && dot) {
-			for (i++; isspace(buf[i]); i++)
-				; /* do_nothing */
-			break;
-		}
-		if (buf[i] != name[j++])
-			break;
-	}
-	return (buf[i] == ']' && name[j] == 0);
-}
-
-/* if new_name == NULL, the section is removed instead */
-int perf_config_rename_section(const char *old_name, const char *new_name)
-{
-	int ret = 0, remove = 0;
-	char *config_filename;
-	int out_fd;
-	char buf[1024];
-
-	if (config_exclusive_filename)
-		config_filename = strdup(config_exclusive_filename);
-	else
-		config_filename = perf_pathdup("config");
-	if (out_fd < 0) {
-		ret = error("could not lock config file %s", config_filename);
-		goto out;
-	}
-
-	if (!(config_file = fopen(config_filename, "rb"))) {
-		/* no config file means nothing to rename, no error */
-		goto unlock_and_out;
-	}
-
-	while (fgets(buf, sizeof(buf), config_file)) {
-		int i;
-		int length;
-		for (i = 0; buf[i] && isspace(buf[i]); i++)
-			; /* do nothing */
-		if (buf[i] == '[') {
-			/* it's a section */
-			if (section_name_match (&buf[i+1], old_name)) {
-				ret++;
-				if (new_name == NULL) {
-					remove = 1;
-					continue;
-				}
-				store.baselen = strlen(new_name);
-				if (!store_write_section(out_fd, new_name)) {
-					goto out;
-				}
-				continue;
-			}
-			remove = 0;
-		}
-		if (remove)
-			continue;
-		length = strlen(buf);
-		if (write_in_full(out_fd, buf, length) != length) {
-			goto out;
-		}
-	}
-	fclose(config_file);
- unlock_and_out:
- out:
-	free(config_filename);
-	return ret;
-}
-
 /*
  * Call this to report error for your variable that should not
  * get a boolean value (i.e. "[my] var" means "true").
diff --git a/Documentation/perf_counter/path.c b/Documentation/perf_counter/path.c
index 891b612ec1a9d8fdc8c4595add3e0eb36e760683..a501a40dd2cbeec12cc2d9b4ced0f5b3ea09842e 100644
--- a/Documentation/perf_counter/path.c
+++ b/Documentation/perf_counter/path.c
@@ -161,45 +161,6 @@ int perf_mkstemp(char *path, size_t len, const char *template)
 }
 
 
-static char *user_path(char *buf, char *path, int sz)
-{
-	struct passwd *pw;
-	char *slash;
-	int len, baselen;
-
-	if (!path || path[0] != '~')
-		return NULL;
-	path++;
-	slash = strchr(path, '/');
-	if (path[0] == '/' || !path[0]) {
-		pw = getpwuid(getuid());
-	}
-	else {
-		if (slash) {
-			*slash = 0;
-			pw = getpwnam(path);
-			*slash = '/';
-		}
-		else
-			pw = getpwnam(path);
-	}
-	if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
-		return NULL;
-	baselen = strlen(pw->pw_dir);
-	memcpy(buf, pw->pw_dir, baselen);
-	while ((1 < baselen) && (buf[baselen-1] == '/')) {
-		buf[baselen-1] = 0;
-		baselen--;
-	}
-	if (slash && slash[1]) {
-		len = strlen(slash);
-		if (sz <= baselen + len)
-			return NULL;
-		memcpy(buf + baselen, slash, len + 1);
-	}
-	return buf;
-}
-
 const char *make_relative_path(const char *abs, const char *base)
 {
 	static char buf[PATH_MAX + 1];
diff --git a/Documentation/perf_counter/perf.c b/Documentation/perf_counter/perf.c
index 9256f6a16446015bee80516ed3522499c0738648..63f8a892c0dff02008027bb1c947f1346d29f71c 100644
--- a/Documentation/perf_counter/perf.c
+++ b/Documentation/perf_counter/perf.c
@@ -1,7 +1,7 @@
 #include "builtin.h"
 #include "exec_cmd.h"
 #include "cache.h"
-//#include "quote.h"
+#include "quote.h"
 #include "run-command.h"
 
 const char perf_usage_string[] =
@@ -132,7 +132,6 @@ static int handle_alias(int *argcp, const char ***argv)
 	const char** new_argv;
 	const char *alias_command;
 	char *alias_string;
-	int unused_nonperf;
 
 	alias_command = (*argv)[0];
 	alias_string = alias_lookup(alias_command);
diff --git a/Documentation/perf_counter/util.h b/Documentation/perf_counter/util.h
index 13f8bdce7600743a945165854a962ad70c874e98..36e40c38e0939ff5eb15e1cf7f9379e7a2e17bbd 100644
--- a/Documentation/perf_counter/util.h
+++ b/Documentation/perf_counter/util.h
@@ -295,6 +295,20 @@ static inline char *gitstrchrnul(const char *s, int c)
 }
 #endif
 
+/*
+ * Wrappers:
+ */
+extern char *xstrdup(const char *str);
+extern void *xmalloc(size_t size);
+extern void *xmemdupz(const void *data, size_t len);
+extern char *xstrndup(const char *str, size_t len);
+extern void *xrealloc(void *ptr, size_t size);
+extern void *xcalloc(size_t nmemb, size_t size);
+extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+extern ssize_t xread(int fd, void *buf, size_t len);
+extern ssize_t xwrite(int fd, const void *buf, size_t len);
+extern int xdup(int fd);
+extern FILE *xfdopen(int fd, const char *mode);
 static inline size_t xsize_t(off_t len)
 {
 	return (size_t)len;