Remove useless duplicate inclusions of system header files.

c.h #includes a number of core libc header files, such as <stdio.h>.
There's no point in re-including these after having read postgres.h,
postgres_fe.h, or c.h; so remove code that did so.

While at it, also fix some places that were ignoring our standard pattern
of "include postgres[_fe].h, then system header files, then other Postgres
header files".  While there's not any great magic in doing it that way
rather than system headers last, it's silly to have just a few files
deviating from the general pattern.  (But I didn't attempt to enforce this
globally, only in files I was touching anyway.)

I'd be the first to say that this is mostly compulsive neatnik-ism,
but over time it might save enough compile cycles to be useful.

contrib/fuzzystrmatch/dmetaphone.c

@@ -93,9 +93,6 @@ The remaining code is authored by Andrew Dunstan <amdunstan@ncshp.org> and
 ***********************************************************************/
 
 
-
-
-
 /* include these first, according to the docs */
 #ifndef DMETAPHONE_MAIN
 
@@ -105,14 +102,19 @@ The remaining code is authored by Andrew Dunstan <amdunstan@ncshp.org> and
 
 /* turn off assertions for embedded function */
 #define NDEBUG
-#endif
 
+#else							/* DMETAPHONE_MAIN */
+
+/* we need these if we didn't get them from postgres.h */
 #include <stdio.h>
-#include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+
+#endif   /* DMETAPHONE_MAIN */
+
 #include <assert.h>
+#include <ctype.h>
 
 /* prototype for the main function we got from the perl module */
 static void DoubleMetaphone(char *, char **);

contrib/ltree/crc32.c

@@ -9,10 +9,6 @@
 
 #include "postgres.h"
 
-#include <sys/types.h>
-#include <stdio.h>
-#include <sys/types.h>
-
 #ifdef LOWER_NODE
 #include <ctype.h>
 #define TOLOWER(x)	tolower((unsigned char) (x))

contrib/pgcrypto/px.h

@@ -32,7 +32,6 @@
 #ifndef __PX_H
 #define __PX_H
 
-#include <sys/types.h>
 #include <sys/param.h>
 
 /* keep debug messages? */

src/backend/access/transam/timeline.c

@@ -32,7 +32,6 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
-#include <stdio.h>
 #include <unistd.h>
 
 #include "access/timeline.h"

src/backend/access/transam/twophase.c

@@ -54,7 +54,6 @@
 
 #include <fcntl.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 

src/backend/access/transam/xlogarchive.c

@@ -14,7 +14,6 @@
 
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <signal.h>

src/backend/commands/dbcommands.c

@@ -20,7 +20,6 @@
 #include "postgres.h"
 
 #include <fcntl.h>
-#include <locale.h>
 #include <unistd.h>
 #include <sys/stat.h>
 

src/backend/commands/tablespace.c

@@ -48,7 +48,6 @@
 
 #include <unistd.h>
 #include <dirent.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 
 #include "access/heapam.h"

src/backend/libpq/ifaddr.c

@@ -20,7 +20,6 @@
 #include "postgres.h"
 
 #include <unistd.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <netdb.h>

src/backend/port/atomics.c

@@ -21,7 +21,6 @@
 #ifdef WIN32
 #error "barriers are required (and provided) on WIN32 platforms"
 #endif
-#include <sys/types.h>
 #include <signal.h>
 #endif
 

src/backend/port/dynloader/freebsd.h

@@ -13,7 +13,6 @@
 #ifndef PORT_PROTOS_H
 #define PORT_PROTOS_H
 
-#include <sys/types.h>
 #include <nlist.h>
 #include <link.h>
 #include <dlfcn.h>

src/backend/port/dynloader/netbsd.h

@@ -14,7 +14,6 @@
 #ifndef PORT_PROTOS_H
 #define PORT_PROTOS_H
 
-#include <sys/types.h>
 #include <nlist.h>
 #include <link.h>
 #include <dlfcn.h>

src/backend/port/dynloader/openbsd.h

@@ -13,7 +13,6 @@
 #ifndef PORT_PROTOS_H
 #define PORT_PROTOS_H
 
-#include <sys/types.h>
 #include <nlist.h>
 #include <link.h>
 #include <dlfcn.h>

src/backend/port/win32/crashdump.c

@@ -39,8 +39,7 @@
 #include "postgres.h"
 
 #define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#include <string.h>
+
 /*
  * Some versions of the MS SDK contain "typedef enum { ... } ;" which the MS
  * compiler quite sanely complains about. Well done, Microsoft.

src/backend/postmaster/autovacuum.c

@@ -62,7 +62,6 @@
 #include "postgres.h"
 
 #include <signal.h>
-#include <sys/types.h>
 #include <sys/time.h>
 #include <unistd.h>
 

src/backend/replication/basebackup.c

@@ -12,7 +12,6 @@
  */
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <time.h>

src/backend/replication/logical/snapbuild.c

@@ -107,7 +107,6 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 #include "miscadmin.h"

src/backend/replication/walreceiverfuncs.c

@@ -16,7 +16,6 @@
  */
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <time.h>

src/backend/storage/ipc/dsm.c

@@ -27,7 +27,6 @@
 #include "postgres.h"
 
 #include <fcntl.h>
-#include <string.h>
 #include <unistd.h>
 #ifndef WIN32
 #include <sys/mman.h>

src/backend/storage/ipc/dsm_impl.c

@@ -49,7 +49,6 @@
 #include "postgres.h"
 
 #include <fcntl.h>
-#include <string.h>
 #include <unistd.h>
 #ifndef WIN32
 #include <sys/mman.h>

src/backend/storage/ipc/latch.c

@@ -40,7 +40,6 @@
 #include <signal.h>
 #include <unistd.h>
 #include <sys/time.h>
-#include <sys/types.h>
 #ifdef HAVE_SYS_EPOLL_H
 #include <sys/epoll.h>
 #endif

src/backend/utils/adt/cash.c

@@ -21,7 +21,6 @@
 #include <limits.h>
 #include <ctype.h>
 #include <math.h>
-#include <locale.h>
 
 #include "libpq/pqformat.h"
 #include "utils/builtins.h"

src/backend/utils/adt/dbsize.c

@@ -11,7 +11,6 @@
 
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 
 #include "access/heapam.h"

src/backend/utils/adt/inet_cidr_ntop.c

@@ -23,7 +23,6 @@ static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 m
 
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

src/backend/utils/adt/inet_net_pton.c

@@ -23,7 +23,6 @@ static const char rcsid[] = "Id: inet_net_pton.c,v 1.4.2.3 2004/03/17 00:40:11 m
 
 #include "postgres.h"
 
-#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

src/backend/utils/adt/pg_locale.c

@@ -51,7 +51,6 @@
 
 #include "postgres.h"
 
-#include <locale.h>
 #include <time.h>
 
 #include "access/htup_details.h"

src/backend/utils/init/miscinit.c

@@ -20,7 +20,6 @@
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/time.h>
-#include <sys/types.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <grp.h>

src/bin/initdb/initdb.c

@@ -52,7 +52,6 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
-#include <locale.h>
 #include <signal.h>
 #include <time.h>
 

src/bin/pg_basebackup/pg_basebackup.c

@@ -16,7 +16,6 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <sys/wait.h>
 #include <signal.h>
 #include <time.h>

src/bin/pg_basebackup/pg_receivewal.c

@@ -17,7 +17,6 @@
 #include <dirent.h>
 #include <signal.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 #include "libpq-fe.h"

src/bin/pg_basebackup/streamutil.c

@@ -13,10 +13,7 @@
 
 #include "postgres_fe.h"
 
-#include <stdio.h>
-#include <string.h>
 #include <sys/time.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 /* for ntohl/htonl */

src/bin/pg_ctl/pg_ctl.c

@@ -19,16 +19,9 @@
 
 #include "postgres_fe.h"
 
-#include "catalog/pg_control.h"
-#include "common/controldata_utils.h"
-#include "libpq-fe.h"
-#include "pqexpbuffer.h"
-
 #include <fcntl.h>
-#include <locale.h>
 #include <signal.h>
 #include <time.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>
@@ -38,8 +31,12 @@
 #include <sys/resource.h>
 #endif
 
+#include "catalog/pg_control.h"
+#include "common/controldata_utils.h"
 #include "getopt_long.h"
+#include "libpq-fe.h"
 #include "miscadmin.h"
+#include "pqexpbuffer.h"
 
 /* PID can be negative for standalone backend */
 typedef long pgpid_t;

src/bin/pg_dump/parallel.c

@@ -51,6 +51,12 @@
 
 #include "postgres_fe.h"
 
+#ifndef WIN32
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+#endif
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
@@ -59,14 +65,6 @@
 #include "pg_backup_utils.h"
 #include "fe_utils/string_utils.h"
 
-#ifndef WIN32
-#include <sys/types.h>
-#include <sys/wait.h>
-#include "signal.h"
-#include <unistd.h>
-#include <fcntl.h>
-#endif
-
 /* Mnemonic macros for indexing the fd array returned by pipe(2) */
 #define PIPE_READ							0
 #define PIPE_WRITE							1

src/bin/pg_dump/pg_backup_archiver.c

@@ -21,24 +21,22 @@
  */
 #include "postgres_fe.h"
 
-#include "parallel.h"
-#include "pg_backup_archiver.h"
-#include "pg_backup_db.h"
-#include "pg_backup_utils.h"
-#include "dumputils.h"
-#include "fe_utils/string_utils.h"
-
 #include <ctype.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <sys/wait.h>
-
 #ifdef WIN32
 #include <io.h>
 #endif
 
+#include "parallel.h"
+#include "pg_backup_archiver.h"
+#include "pg_backup_db.h"
+#include "pg_backup_utils.h"
+#include "dumputils.h"
+#include "fe_utils/string_utils.h"
+
 #include "libpq/libpq-fs.h"
 
 #define TEXT_DUMP_HEADER "--\n-- PostgreSQL database dump\n--\n\n"

src/bin/pg_dump/pg_dump.c

@@ -33,9 +33,6 @@
 
 #include <unistd.h>
 #include <ctype.h>
-#ifdef ENABLE_NLS
-#include <locale.h>
-#endif
 #ifdef HAVE_TERMIOS_H
 #include <termios.h>
 #endif

src/bin/pg_dump/pg_dumpall.c

@@ -18,10 +18,6 @@
 #include <time.h>
 #include <unistd.h>
 
-#ifdef ENABLE_NLS
-#include <locale.h>
-#endif
-
 #include "getopt_long.h"
 
 #include "dumputils.h"

src/bin/pg_dump/pg_restore.c

@@ -40,21 +40,16 @@
  */
 #include "postgres_fe.h"
 
-#include "getopt_long.h"
-
-#include "dumputils.h"
-#include "parallel.h"
-#include "pg_backup_utils.h"
-
 #include <ctype.h>
-
 #ifdef HAVE_TERMIOS_H
 #include <termios.h>
 #endif
 
-#ifdef ENABLE_NLS
-#include <locale.h>
-#endif
+#include "getopt_long.h"
+
+#include "dumputils.h"
+#include "parallel.h"
+#include "pg_backup_utils.h"
 
 
 static void usage(const char *progname);

src/bin/pg_resetwal/pg_resetwal.c

@@ -39,7 +39,6 @@
 
 #include <dirent.h>
 #include <fcntl.h>
-#include <locale.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <time.h>

src/bin/pg_rewind/copy_fetch.c

@@ -9,12 +9,10 @@
  */
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include <string.h>
 
 #include "datapagemap.h"
 #include "fetch.h"

src/bin/pg_rewind/fetch.c

@@ -16,7 +16,6 @@
  */
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 

src/bin/pg_rewind/file_ops.c

@@ -14,7 +14,6 @@
  */
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>

src/bin/pg_rewind/filemap.c

@@ -10,7 +10,6 @@
 
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 

src/bin/pg_rewind/libpq_fetch.c

@@ -9,7 +9,6 @@
  */
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
 #include <fcntl.h>

src/bin/pg_upgrade/dump.c

@@ -11,7 +11,6 @@
 
 #include "pg_upgrade.h"
 
-#include <sys/types.h>
 #include "fe_utils/string_utils.h"
 
 

src/bin/pg_upgrade/exec.c

@@ -9,10 +9,9 @@
 
 #include "postgres_fe.h"
 
-#include "pg_upgrade.h"
-
 #include <fcntl.h>
-#include <sys/types.h>
+
+#include "pg_upgrade.h"
 
 static void check_data_dir(ClusterInfo *cluster);
 static void check_bin_dir(ClusterInfo *cluster);

src/bin/pg_upgrade/option.c

@@ -9,17 +9,16 @@
 
 #include "postgres_fe.h"
 
-#include "miscadmin.h"
-#include "getopt_long.h"
-
-#include "pg_upgrade.h"
-
 #include <time.h>
-#include <sys/types.h>
 #ifdef WIN32
 #include <io.h>
 #endif
 
+#include "miscadmin.h"
+#include "getopt_long.h"
+
+#include "pg_upgrade.h"
+
 
 static void usage(void);
 static void check_required_directory(char **dirpath, char **configpath,

src/bin/pg_upgrade/parallel.c

@@ -9,17 +9,14 @@
 
 #include "postgres_fe.h"
 
-#include "pg_upgrade.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
 #include <sys/wait.h>
-
 #ifdef WIN32
 #include <io.h>
 #endif
 
+#include "pg_upgrade.h"
+
+
 static int	parallel_jobs;
 
 #ifdef WIN32

src/bin/pg_upgrade/tablespace.c

@@ -11,8 +11,6 @@
 
 #include "pg_upgrade.h"
 
-#include <sys/types.h>
-
 static void get_tablespace_paths(void);
 static void set_tablespace_directory_suffix(ClusterInfo *cluster);
 

src/bin/pgevent/pgevent.c

@@ -10,15 +10,9 @@
  *
  *-------------------------------------------------------------------------
  */
-
-
 #include "postgres_fe.h"
 
-#include <windows.h>
 #include <olectl.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
 
 /* Global variables */
 HANDLE		g_module = NULL;	/* hModule of DLL */

src/bin/psql/command.c

@@ -18,7 +18,6 @@
 #include <pwd.h>
 #endif
 #ifndef WIN32
-#include <sys/types.h>			/* for umask() */
 #include <sys/stat.h>			/* for stat() */
 #include <fcntl.h>				/* open() flags */
 #include <unistd.h>				/* for geteuid(), getpid(), stat() */
@@ -27,7 +26,6 @@
 #include <io.h>
 #include <fcntl.h>
 #include <direct.h>
-#include <sys/types.h>			/* for umask() */
 #include <sys/stat.h>			/* for stat() */
 #endif
 

src/bin/psql/crosstabview.c

@@ -7,8 +7,6 @@
  */
 #include "postgres_fe.h"
 
-#include <string.h>
-
 #include "common.h"
 #include "crosstabview.h"
 #include "pqexpbuffer.h"

src/bin/psql/help.c

@@ -8,7 +8,6 @@
 #include "postgres_fe.h"
 
 #ifndef WIN32
-#include <sys/types.h>			/* (ditto) */
 #include <unistd.h>				/* for geteuid() */
 #else
 #include <win32.h>

src/bin/psql/startup.c

@@ -7,8 +7,6 @@
  */
 #include "postgres_fe.h"
 
-#include <sys/types.h>
-
 #ifndef WIN32
 #include <unistd.h>
 #else							/* WIN32 */
@@ -18,8 +16,6 @@
 
 #include "getopt_long.h"
 
-#include <locale.h>
-
 #include "command.h"
 #include "common.h"
 #include "describe.h"

src/common/ip.c

@@ -24,7 +24,6 @@
 #endif
 
 #include <unistd.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <netdb.h>

src/common/username.c

@@ -18,10 +18,8 @@
 #include "postgres_fe.h"
 #endif
 
-#include <errno.h>
 #include <pwd.h>
 #include <unistd.h>
-#include <sys/types.h>
 
 #include "common/username.h"
 

src/common/wait_error.c

@@ -21,8 +21,6 @@
 #endif
 
 #include <signal.h>
-#include <stdio.h>
-#include <string.h>
 #include <sys/wait.h>
 
 /*

src/fe_utils/print.c

@@ -18,7 +18,6 @@
 #include "postgres_fe.h"
 
 #include <limits.h>
-#include <locale.h>
 #include <math.h>
 #include <signal.h>
 #include <unistd.h>

src/include/libpq/libpq.h

@@ -14,7 +14,6 @@
 #ifndef LIBPQ_H
 #define LIBPQ_H
 
-#include <sys/types.h>
 #include <netinet/in.h>
 
 #include "lib/stringinfo.h"

src/include/port/atomics/generic-msvc.h

@@ -17,7 +17,6 @@
  *-------------------------------------------------------------------------
  */
 #include <intrin.h>
-#include <windows.h>
 
 /* intentionally no include guards, should only be included by atomics.h */
 #ifndef INSIDE_ATOMICS_H

src/include/utils/pg_locale.h

@@ -12,7 +12,6 @@
 #ifndef _PG_LOCALE_
 #define _PG_LOCALE_
 
-#include <locale.h>
 #if defined(LOCALE_T_IN_XLOCALE) || defined(WCSTOMBS_L_IN_XLOCALE)
 #include <xlocale.h>
 #endif

src/interfaces/ecpg/ecpglib/data.c

@@ -3,8 +3,6 @@
 #define POSTGRES_ECPG_INTERNAL
 #include "postgres_fe.h"
 
-#include <stdlib.h>
-#include <string.h>
 #include <float.h>
 #include <math.h>
 

src/interfaces/ecpg/ecpglib/execute.c

@@ -16,7 +16,6 @@
 #define POSTGRES_ECPG_INTERNAL
 #include "postgres_fe.h"
 
-#include <locale.h>
 #include <float.h>
 #include <math.h>
 

src/interfaces/ecpg/ecpglib/typename.c

@@ -3,7 +3,6 @@
 #define POSTGRES_ECPG_INTERNAL
 #include "postgres_fe.h"
 
-#include <stdlib.h>
 #include "ecpgtype.h"
 #include "ecpglib.h"
 #include "extern.h"

src/interfaces/ecpg/preproc/ecpg.c

@@ -6,7 +6,7 @@
 #include "postgres_fe.h"
 
 #include <unistd.h>
-#include <string.h>
+
 #include "getopt_long.h"
 
 #include "extern.h"

src/interfaces/ecpg/preproc/pgc.l

@@ -19,7 +19,6 @@
 #include "postgres_fe.h"
 
 #include <ctype.h>
-#include <sys/types.h>
 #include <limits.h>
 
 #include "extern.h"

src/interfaces/libpq/fe-connect.c

@@ -15,7 +15,6 @@
 
 #include "postgres_fe.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <ctype.h>

src/interfaces/libpq/libpq-int.h

@@ -25,7 +25,6 @@
 #include "libpq-events.h"
 
 #include <time.h>
-#include <sys/types.h>
 #ifndef WIN32
 #include <sys/time.h>
 #endif

src/interfaces/libpq/pthread-win32.c

@@ -12,7 +12,6 @@
 
 #include "postgres_fe.h"
 
-#include <windows.h>
 #include "pthread-win32.h"
 
 DWORD

src/pl/plperl/plperl.c

@@ -13,7 +13,6 @@
 #include <ctype.h>
 #include <fcntl.h>
 #include <limits.h>
-#include <locale.h>
 #include <unistd.h>
 
 /* postgreSQL stuff */

src/port/chklocale.c

@@ -19,11 +19,6 @@
 #include "postgres_fe.h"
 #endif
 
-#if defined(WIN32) && (_MSC_VER >= 1900)
-#include <windows.h>
-#endif
-
-#include <locale.h>
 #ifdef HAVE_LANGINFO_H
 #include <langinfo.h>
 #endif

src/port/dirmod.c

@@ -34,7 +34,6 @@
 #ifndef __CYGWIN__
 #include <winioctl.h>
 #else
-#include <windows.h>
 #include <w32api/winioctl.h>
 #endif
 #endif

src/port/inet_net_ntop.c

@@ -27,7 +27,6 @@ static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 m
 #include "postgres_fe.h"
 #endif
 
-#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

src/port/open.c

@@ -19,7 +19,6 @@
 #include "postgres_fe.h"
 #endif
 
-#include <windows.h>
 #include <fcntl.h>
 #include <assert.h>
 

src/port/system.c

@@ -44,7 +44,6 @@
 #include "postgres_fe.h"
 #endif
 
-#include <windows.h>
 #include <fcntl.h>
 
 #undef system

src/test/isolation/isolationtester.c

@@ -7,9 +7,6 @@
 
 #include "postgres_fe.h"
 
-#ifdef WIN32
-#include <windows.h>
-#endif
 #include <sys/time.h>
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>

src/timezone/strftime.c

@@ -41,7 +41,6 @@
 #include "postgres.h"
 
 #include <fcntl.h>
-#include <locale.h>
 
 #include "private.h"
 #include "tzfile.h"

src/timezone/zic.c

@@ -9,7 +9,6 @@
 #include "postgres_fe.h"
 
 #include <fcntl.h>
-#include <locale.h>
 #include <sys/stat.h>
 #include <time.h>
 #include <unistd.h>