On Wed May 18, 2005 at 18:00:49 +0200, Rene Wittmann wrote:
I'm still trying to write to a file in DROPS. What is the best way to do so?
When trying to use the OSKIT support (at least I think that I use it...) it doesn't work, maybe I'm thinking too straightforward, but my code looks simply this way:
#include <stdio.h>
char LOG_tag[9]="tso_test";
int main(int argc, const char**argv){ FILE *handle; int i; handle = fopen("/tmp/check","w+"); printf("before fileprinting\n"); fprintf(handle,"Just a writing to file test."); printf("after fileprinting\n"); fclose(handle); printf("after closing\n"); return 0; }
My Makefile (compiling without error or warning):
PKGDIR ?= ../.. L4DIR ?= $(PKGDIR)/../.. TARGET = tso_test
DEFAULT_RELOC = 0x02000000 MODE = l4env SRC_C = tso_test.c LOGTAG = $(addprefix ",$(addsuffix ",$(TARGET)))
include $(L4DIR)/mk/prog.mk
Finally my config:
title vmware tso_test root (hd0,1) kernel /drops/drops/bin/x86_586/l4v2/rmgr -sigma0 module /drops/l4/kernel/fiasco/build/main -nokdb -nowait -serial -serial_esc module /drops/drops/bin/x86_586/l4v2/sigma0 modaddr 0x02000000 module /drops/drops/bin/x86_586/l4v2/names module /drops/drops/bin/x86_586/l4v2/log module /drops/drops/bin/x86_586/l4v2/dm_phys module /drops/drops/bin/x86_586/l4v2/simple_ts module /drops/drops/bin/x86_586/l4v2/tso_test
But the error message:
names | Fiasco detected, registering thread names at kernel tso_test| OSKit support: using 4096KB at 0x00180000 as heap tso_test| fs_init: WARNING: No Filesystem tso_test| before fileprinting tso_test| Just a writing to file test.after fileprinting tso_test| L4RM: [PF] read at 0x000000c, eip 0200e54b, src 9.02 tso_test| [9.0] l4rm/lib/src/pagefault.c:78:__unknown_pf(): tso_test| unhandled page fault
--PANIC--------------------------------------------------EIP:02004403 (9.00) jdb:
Of course, I can see that fs_init says about "No Filesystem". Is it because I'm using reiserfs? Would it work with ext2?
Or is there a better way writing to a file in DROPS? Maybe some L4-specific functions?
You're missing quite a bit of functionality to make writing to a file actually work. To write some data to a file you'll need at least a block driver for your storage device (e.g. IDE driver) and a filesystem that brings some order into the many blocks of your block device. Those components are somehow missing from your module list. ;)
I suggest looking into the l4vfs package, it has some of the needed infrastructure for filesystems etc.
Adam