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	microkernel/mach/external_pager_mechanism.mdwn

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+[[!meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled
+[[GNU Free Documentation License|/fdl]]."]]"""]]
+
+## Data User-Server Translator Example
+
+The code examples were written by Anand Babu.
+
+We have a data.h header file, a data.defs file, a data-user.c, data-server.c
+sources files and a Makefile.
+
+data.h:
+-------
+
+    #ifndef	_data_user_
+    #define	_data_user_
+    
+    /* Module data */
+    
+    #include <mach/kern_return.h>
+    #include <mach/port.h>
+    #include <mach/message.h>
+    
+    #include <mach/std_types.h>
+    #include <mach/mach_types.h>
+    #include <device/device_types.h>
+    #include <device/net_status.h>
+    #include <sys/types.h>
+    #include <sys/stat.h>
+    #include <sys/statfs.h>
+    #include <sys/resource.h>
+    #include <sys/utsname.h>
+    #include <hurd/hurd_types.h>
+    
+    /* Routine data_set_value */
+    #ifdef	mig_external
+    mig_external
+    #else
+    extern
+    #endif
+    kern_return_t S_data_set_value
+    #if	defined(LINTLIBRARY)
+        (data_port, value)
+    	mach_port_t data_port;
+    	int value;
+    { return S_data_set_value(data_port, value); }
+    #else
+    (
+    	mach_port_t data_port,
+    	int value
+    );
+    #endif
+    
+    /* Routine data_get_value */
+    #ifdef	mig_external
+    mig_external
+    #else
+    extern
+    #endif
+    kern_return_t S_data_get_value
+    #if	defined(LINTLIBRARY)
+        (data_port, value)
+    	mach_port_t data_port;
+    	int *value;
+    { return S_data_get_value(data_port, value); }
+    #else
+    (
+    	mach_port_t data_port,
+    	int *value
+    );
+    #endif
+    
+    #endif	/* not defined(_data_user_) */
+
+data.defs:
+----------
+
+    /* Definitions for data interface
+    
+    This file is part of the GNU Hurd.
+    
+    The GNU Hurd is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2, or (at your option)
+    any later version.
+    
+    The GNU Hurd is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    
+    You should have received a copy of the GNU General Public License
+    along with the GNU Hurd; see the file COPYING.  If not, write to
+    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+    
+    subsystem data 45000;
+    
+    #include <hurd/hurd_types.defs>
+    
+    #ifdef STACK_IMPORTS
+    STACK_IMPORTS
+    #endif
+    
+    /* intr-rpc.defs defines the INTR_INTERFACE macro to make the generated RPC
+    stubs send-interruptible, and to prefix them with `hurd_intr_rpc_'. */
+    INTR_INTERFACE
+    
+    /* set integer value to data */
+    routine data_set_value (
+    	data_port: mach_port_t;
+    	value: int);
+    
+    /* get integer value from data */
+    routine data_get_value (
+    	data_port: mach_port_t;
+    	out value: int);
+
+data-user.c:
+------------
+
+    #include <stdio.h>
+    #include <hurd.h>
+    #include <hurd/hurd_types.h>
+    #include "data.h"
+    
+    #ifndef _GNU_SOURCE
+      #define _GNU_SOURCE
+    #endif
+    
+    int
+    main(int argc, char *argv[])
+    {
+      int value=0;
+      mach_port_t data_server_port;
+    
+      data_server_port = file_name_lookup ("/tmp/trans", 0, 0);
+      printf ("data_server_port [%u]\n", data_server_port);
+      S_data_set_value (data_server_port, 99);
+      S_data_get_value (data_server_port, &value);
+      printf ("data->get_value: [%d]\n", value);
+      
+      return 0;
+    }
+
+data-server.c:
+--------------
+
+    #ifndef _GNU_SOURCE
+      #define _GNU_SOURCE
+    #endif
+    
+    #include <stdio.h>
+    #include <getopt.h>
+    #include <errno.h>
+    #include <sys/stat.h>
+    #include <error.h>
+    
+    #include <hurd/ports.h>
+    #include <hurd/hurd_types.h>
+    #include <hurd/trivfs.h>
+    
+    #include "data.h"
+    
+    extern boolean_t S_data_server
+    (mach_msg_header_t *InHeadP, mach_msg_header_t *OutHeadP);
+    
+    int trivfs_fstype = FSTYPE_MISC;
+    int trivfs_fsid = 0;
+    int trivfs_support_read = 0;
+    int trivfs_support_write = 0;
+    int trivfs_support_exec = 0;
+    int trivfs_allow_open = 0x00;
+    int trivfs_protid_nportclasses = 0;
+    int trivfs_cntl_nportclasses = 0;
+    
+    int data_value;
+    
+    int demuxer (mach_msg_header_t *inp, mach_msg_header_t *outp)
+    {
+      return (S_data_server(inp,outp)||trivfs_demuxer(inp,outp));
+    }
+    
+    void trivfs_modify_stat (struct trivfs_protid *cred, io_statbuf_t  *st)
+    {
+    }
+    error_t trivfs_goaway (struct trivfs_control *fsys, int flags)
+    {
+      exit (0);
+    }
+    
+    kern_return_t S_data_set_value (mach_port_t data_port, int value)
+    {
+      data_value = value;
+      return 0;
+    }
+    
+    kern_return_t S_data_get_value (mach_port_t data_port, int *value)
+    {
+      *value = data_value;
+      return 0;
+    }
+    
+    int
+    main(int argc, char *argv[])
+    {
+      int err;
+      mach_port_t bootstrap;
+      struct trivfs_control *fsys;
+    
+      if (argc > 1)
+        {
+          fprintf(stderr, "Usage: settrans [opts] node %s\n", program_invocation_name); 
+          exit (1);
+        }
+    
+      task_get_bootstrap_port (mach_task_self (), &bootstrap);
+      if (bootstrap == MACH_PORT_NULL)
+        error(2, 0, "Must be started as a translator");
+    
+      /* Reply to our parent */
+      err = trivfs_startup (bootstrap, 0, 0, 0, 0, 0,&fsys);
+      mach_port_deallocate (mach_task_self (), bootstrap);
+      if (err) {
+        return (0);
+      }
+    
+      ports_manage_port_operations_one_thread (fsys->pi.bucket, demuxer, 0);
+    
+      return 0;
+    }
+
+Makefile:
+---------
+
+    CC = gcc
+    MIG = mig
+    CFLAGS = -Wall -g  -D_GNU_SOURCE
+    LDFLAGS = -lthreads -lports -ltrivfs -lfshelp -lshouldbeinlibc
+    INCLUDES = -I.
+    LCHDRS = 
+    MIGCOMSFLAGS = -prefix S_
+    OBJS = $(SRCS:.c=.o)
+    TAGS = etags.emacs21
+    
+    all: data-server data-user
+    tags:
+    	$(TAGS) $(SRCS) $(LCHDRS)
+    
+    stubs: data.defs
+    	$(MIG) $(MIGCOMSFLAGS) -server dataServer.c -user dataUser.c $^
+    data-server: data-server.c dataServer.c 
+    	$(CC) $^ $(CFLAGS) $(INCLUDES) $(LDFLAGS) -o $@
+    data-user: data-user.c dataUser.c
+    	$(CC) $^ $(CFLAGS) $(INCLUDES) -o $@
+    clean:
+    	rm -f *.o data-server data-user
+    
+    start: data-server data-user
+    	settrans -ac /tmp/trans data-server
+    	ps -x | grep data-server
+    end:
+    	settrans -fg /tmp/trans
+
+Building
+--------
+
+Do
+
+    make stubs
+
+to create the dataUser.c and dataServer.c files generated by mig.  Create the
+executables using:
+
+    make all
+
+Testing
+-------
+
+Start the data-server translator using:
+
+    settrans -ac /tmp/trans data-server
+
+You can check if it is running using
+
+    ps -x | grep data-server
+
+Run the data-user executable to get the resultant output.
+
+You can remove the translator using:
+
+    settrans -fg /tmp/trans
+
+To remove the built files use:
+
+    make clean
+
+Happy Hacking!