Rely on gnulib's unistd.h replacement.

With gnulib's unistd module, we can assume unistd.h is always present, and that
STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO are always defined.

Don't remove unistd.h from GDB's configure.ac, as later tests in the
file use HAVE_UNISTD_H checks.

gdb/
2013-07-01  Pedro Alves  <palves@redhat.com>

	* defs.h: Don't check HAVE_UNISTD_H before including <unistd.h>.
	(STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO): Delete.
	* tracepoint.c: Don't check HAVE_UNISTD_H before including
	<unistd.h>.

gdb/gdbserver/
2013-07-01  Pedro Alves  <palves@redhat.com>

	* event-loop.c: Don't check HAVE_UNISTD_H before including
	<unistd.h>.
	* gdbreplay.c: Likewise.
	* remote-utils.c: Likewise.
	* server.c: Likewise.
	* configure.ac: Don't check for unistd.h.
	* configure: Regenerate.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2013-07-01  Pedro Alves  <palves@redhat.com>
+
+	* defs.h: Don't check HAVE_UNISTD_H before including <unistd.h>.
+	(STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO): Delete.
+	* tracepoint.c: Don't check HAVE_UNISTD_H before including
+	<unistd.h>.
+
 2013-07-01  Pedro Alves  <palves@redhat.com>
 
 	Import the "unistd" gnulib module.

gdb/defs.h

@@ -52,10 +52,7 @@
 #include <stddef.h>
 #endif
 
-#ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#endif
-
 #include <fcntl.h>
 
 /* First include ansidecl.h so we can use the various macro definitions
@@ -766,17 +763,6 @@ extern int use_windows;
 #define MERGEPID(PID, TID) ptid_build (PID, TID, 0)
 #endif
 
-/* Define well known filenos if the system does not define them.  */
-#ifndef STDIN_FILENO
-#define STDIN_FILENO   0
-#endif
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO  1
-#endif
-#ifndef STDERR_FILENO
-#define STDERR_FILENO  2
-#endif
-
 /* If this definition isn't overridden by the header files, assume
    that isatty and fileno exist on this system.  */
 #ifndef ISATTY

gdb/gdbserver/ChangeLog

@@ -1,3 +1,13 @@
+2013-07-01  Pedro Alves  <palves@redhat.com>
+
+	* event-loop.c: Don't check HAVE_UNISTD_H before including
+	<unistd.h>.
+	* gdbreplay.c: Likewise.
+	* remote-utils.c: Likewise.
+	* server.c: Likewise.
+	* configure.ac: Don't check for unistd.h.
+	* configure: Regenerate.
+
 2013-06-28  Tom Tromey  <tromey@redhat.com>
 
 	* Makefile.in (version.c): Use version.in, not

gdb/gdbserver/configure

@@ -4783,7 +4783,7 @@ $as_echo "$as_me: running $SHELL $ac_sub_configure $ac_sub_configure_args --cach
   cd "$ac_popdir"
 
 
-for ac_header in sgtty.h termio.h termios.h sys/reg.h string.h 		 proc_service.h sys/procfs.h thread_db.h linux/elf.h 		 stdlib.h unistd.h 		 errno.h fcntl.h signal.h sys/file.h malloc.h 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h 		 netinet/tcp.h arpa/inet.h sys/wait.h wait.h sys/un.h 		 linux/perf_event.h
+for ac_header in sgtty.h termio.h termios.h sys/reg.h string.h 		 proc_service.h sys/procfs.h thread_db.h linux/elf.h 		 stdlib.h 		 errno.h fcntl.h signal.h sys/file.h malloc.h 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h 		 netinet/tcp.h arpa/inet.h sys/wait.h wait.h sys/un.h 		 linux/perf_event.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"

gdb/gdbserver/configure.ac

@@ -65,7 +65,7 @@ ACX_CONFIGURE_DIR(["../gnulib"], ["build-gnulib-gdbserver"])
 
 AC_CHECK_HEADERS(sgtty.h termio.h termios.h sys/reg.h string.h dnl
 		 proc_service.h sys/procfs.h thread_db.h linux/elf.h dnl
-		 stdlib.h unistd.h dnl
+		 stdlib.h dnl
 		 errno.h fcntl.h signal.h sys/file.h malloc.h dnl
 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h dnl
 		 netinet/tcp.h arpa/inet.h sys/wait.h wait.h sys/un.h dnl

gdb/gdbserver/event-loop.c

@@ -34,9 +34,7 @@
 #include <errno.h>
 #endif
 
-#ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 
 typedef struct gdb_event gdb_event;
 typedef int (event_handler_func) (gdb_fildes_t);

gdb/gdbserver/gdbreplay.c

@@ -41,9 +41,7 @@
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
-#ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif

gdb/gdbserver/remote-utils.c

@@ -51,9 +51,7 @@
 #include <fcntl.h>
 #endif
 #include <sys/time.h>
-#if HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 #if HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif

gdb/gdbserver/server.c

@@ -22,9 +22,7 @@
 #include "notif.h"
 #include "tdesc.h"
 
-#if HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 #if HAVE_SIGNAL_H
 #include <signal.h>
 #endif

gdb/tracepoint.c

@@ -64,9 +64,7 @@
 /* readline defines this.  */
 #undef savestring
 
-#ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0