Commit Graph

18 Commits

Author SHA1 Message Date
Giacomo Tesio 37541724d0 kernel: add #0/brk and move brk_() to libc 2016-12-31 00:43:02 +01:00
Giacomo Tesio 0bbd79e0a5 kernel: waitdebugger on lapictimerset if apic->div == 0 2016-12-26 02:18:19 +01:00
Giacomo Tesio 71ea62eb5b rm -e prints the return value of remove syscalls
Some devices return useful info on specific file remove (eg #0/pid, #0/ppid...)
so we need a tool to get such info.

	rm -e '#0/pid' '#0/ppid'
	#0/pid 65
	#0/ppid 59
2016-12-26 02:18:19 +01:00
Giacomo Tesio 31aa85b01a kernel: move pgrpid to devself 2016-12-26 02:18:19 +01:00
Giacomo Tesio 66373243bd libc: rewrite access() 2016-12-26 02:18:06 +01:00
Giacomo Tesio b862596737 kernel&all: create() syscall only sends Tcreate
In Plan9 the create syscall fallback on a open(OTRUNC) if the
path provided already exists. This is actually a common requirement
as most programs (editors, cat...) simply requires that a file is
there and is empty, and doesn't care overwriting existing contents
(note that this is particularily sensible with something like fossil).

In Jehanne the application is responsible of actually handle this
"file exists" error but libc provides ocreate() to mimic the Plan9
behaviour. Note that ocreate introduce a subtle race too: the path
is walked several times if the file exists, thus it could misbehave
on concurrent namespace changes. However I guess this is not going to
happen often enough to care now.

NOTE we will probably address this rare race too, with a more drammatic change
to syscalls: a new walk() syscall that will provide an unopen fd.
2016-12-24 21:25:20 +01:00
Giacomo Tesio 0c094289e6 9P2000: give a name to NinepMsgType to ease debug 2016-12-24 21:25:05 +01:00
Giacomo Tesio c30fb72b82 kernel: allow negative lengths in pwrite 2016-12-24 21:24:49 +01:00
Giacomo Tesio ca05868e4d kernel: use #9 instead of #M in /proc/n/ns 2016-12-24 21:24:28 +01:00
Giacomo Tesio 99855d60d6 kernel: move chdir to libc using devself/devproc
Added wdir to devself and devproc:

- read '#0/wdir' to get the working directory of the calling process
  NOTE that a read(fd, nil, -1) will return the negated length
  of the working directory, just in case you want to
  allocate the memory required

- read '/proc/n/wdir' to know the working directory of process n
  (read(fd, nil, -1) still returns the negated length)

- write '#0/wdir' to change the working directory of the calling process
  NOTE: no offset is allowed and the provided string must
  be null terminated

- write '/proc/n/wdir' to change the working directory of process n
  NOTE: no offset is allowed and the provided string must
  be null terminated; moreover if another process change the working
  directory change during the write, the current process will
  receive an error.

In libc updated getwd() and chdir().
Also modified pwd to get advantage of the new file.

To test, run /arch/amd64/qa/kern/wdir.rc or simply try

	% pwd
	/usr/glenda
	% echo -n /tmp > /proc/$pid/wdir
        % pwd
        /tmp
        % cat '#0/wdir' && echo
        /tmp

The expected use cases for wdir in devproc are rio and acme.

Also, note that we could theoretically remove the cd builtin
from rc and simply implement it as a rc function.
We don't do that to preserve rc portability to other OS.
2016-12-15 22:42:01 +01:00
Giacomo Tesio c6de6b66e9 kernel: introduce devself
Devself provides to each process access to its own structures.

So far it contains four files:

- pid
- ppid
- pipes	used to implement pipe(2)
- segments used to implement segattach, segdetach and segfree
2016-12-11 01:26:08 +01:00
Giacomo Tesio f52a185030 decouple Jehanne from 9P2000 (as much as needed)
Jehanne is going to use a new file protocol, but Plan 9 is really
coupled with 9P2000.

Renamed fcall.h as 9P2000.h and introduced specific constants such
as NP_OREAD, NP_OWRITE and so on, so that we can use different values
in the kernel and new protocol.

Renamed devmnt to devninep, since it's actually a device serving 9P2000
file systems.

Also, fixed 9P2000 support in Jehanne, that was broken with the introduction
of OSTAT.
2016-12-06 23:01:45 +01:00
Giacomo Tesio bbb375a585 kernel: return long from file related syscalls 2016-11-30 20:18:45 +01:00
Giacomo Tesio a9745e02c5 kernel: in Proc defined syscallerr to hold the return value of failing syscalls 2016-11-30 01:07:45 +01:00
Giacomo Tesio 488106eaac cmd/ms: read #P/ps2mouse in a char (not in an int)
After the removal of dumb push in crt0 (commit 929014ebca5c738d3854758326de7abfb77c1ef1)
the first byte of the c integer is not zeroed anymore (which is correct).

But since ms.c reads and bit-match a single byte in c, when it's an int some test success/fail
due to the state of the unused bytes.

This makes the mouse turn crazy.

So we turn it into a char, so that bitmasks and tests work as expected.
2016-11-29 20:42:24 +01:00
Giacomo Tesio 52777e21ab kernel: devdraw: use sys->ticks instead of m->ticks in drawactive() 2016-11-29 20:41:55 +01:00
Giacomo Tesio 38aca7a581 first usable version of kernel and commands
After an year of hard work, this is a first "usable" version of Jehanne.
2016-11-26 03:49:29 +01:00
Giacomo Tesio 3925b61fa6 libc: initial import from Harvey
Note that libc is what distinguish "native" software from "non-native"
in Jehanne: further C libraries can be ported to Jehanne, but this libc
will remain the main building block of the system.

Also note that a few files have not been ported from Harvey:

	- 9sys/pushtls.c
	- port/rijndael.c
	- port/rijndael.tbl
	- port/sha2.c

Pushtls.c depends on libmp and libsec so libc is not the appropriate place
for it. The other three will be moved to libsec.
2015-12-22 11:55:44 +00:00