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diff --git a/hurdtranslatorexample.mdwn b/hurdtranslatorexample.mdwn new file mode 100644 index 00000000..61d3e4cf --- /dev/null +++ b/hurdtranslatorexample.mdwn @@ -0,0 +1,311 @@ +[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]] +[[meta license="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: +------- + +<pre> +#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_) */ +</pre> + +data.defs: +---------- + +<pre> +/* 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); +</pre> + +data-user.c: +------------ + +<pre> +#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; +} +</pre> + +data-server.c: +-------------- + +<pre> +#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; +} +</pre> + +Makefile: +--------- + +<pre> +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 +</pre> + +Building +-------- + +Do + +<pre> make stubs </pre> + +to create the dataUser.c and dataServer.c files generated by mig. Create the executables using: + +<pre> make all </pre> + +Testing +------- + +Start the data-server translator using: + +<pre> settrans -ac /tmp/trans data-server </pre> + +You can check if it is running u sing + +<pre> ps -x | grep data-server </pre> + +Run the data-user executable to get the resultant output. + +You can remove the translator using: + +<pre> settrans -fg /tmp/trans </pre> + +To remove the built files use: + +<pre> make clean </pre>. + +Happy Hacking! + +-- ShakthiKannan - 01 Dec 2006
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