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41 commits

Author SHA1 Message Date
Itamar
50fd2cabff ptrace: Report error in PT_PEEK via errno
The syscall wrapper for ptrace needs to return the peeked value when
using  PT_PEEK.
Because of this, the user has to check errno to detect an error in
PT_PEEK.

This commit changes the actual syscall's interface (only for PT_PEEK) to
allow the syscall wrapper to detect an error and change errno.
2020-04-13 00:53:22 +02:00
Itamar
9e51e295cf ptrace: Add PT_SETREGS
PT_SETTREGS sets the regsiters of the traced thread. It can only be
used when the tracee is stopped.

Also, refactor ptrace.
The implementation was getting long and cluttered the alraedy large
Process.cpp file.

This commit moves the bulk of the implementation to Kernel/Ptrace.cpp,
and factors out peek & poke to separate methods of the Process class.
2020-04-13 00:53:22 +02:00
Itamar
b306ac9b2b ptrace: Add PT_POKE
PT_POKE writes a single word to the tracee's address space.

Some caveats:
- If the user requests to write to an address in a read-only region, we
temporarily change the page's protections to allow it.

- If the user requests to write to a region that's backed by a
SharedInodeVMObject, we replace the vmobject with a PrivateIndoeVMObject.
2020-04-13 00:53:22 +02:00
Itamar
984ff93406 ptrace: Add PT_PEEK
PT_PEEK reads a single word from the tracee's address space and returns
it to the tracer.
2020-04-13 00:53:22 +02:00
Itamar
77f671b462 CPU: Handle breakpoint trap
Also, start working on the debugger app.
2020-04-13 00:53:22 +02:00
AnotherTest
77191d82dc Kernel: Add the SO_BINDTODEVICE socket option
This patch adds a way for a socket to ask to be routed through a
specific interface.
Currently, this option only applies to sending, however, it should also
apply to receiving...somehow :^)
2020-04-05 09:50:48 +02:00
Itamar
e5ebdb9bca strace: Change implementation to use ptrace() 2020-03-28 18:27:18 +01:00
Itamar
6b74d38aab Kernel: Add 'ptrace' syscall
This commit adds a basic implementation of
the ptrace syscall, which allows one process
(the tracer) to control another process (the tracee).

While a process is being traced, it is stopped whenever a signal is
received (other than SIGCONT).

The tracer can start tracing another thread with PT_ATTACH,
which causes the tracee to stop.

From there, the tracer can use PT_CONTINUE
to continue the execution of the tracee,
or use other request codes (which haven't been implemented yet)
to modify the state of the tracee.

Additional request codes are PT_SYSCALL, which causes the tracee to
continue exection but stop at the next entry or exit from a syscall,
and PT_GETREGS which fethces the last saved register set of the tracee
(can be used to inspect syscall arguments and return value).

A special request code is PT_TRACE_ME, which is issued by the tracee
and causes it to stop when it calls execve and wait for the
tracer to attach.
2020-03-28 18:27:18 +01:00
marprok
0fd5f0e4bd Userland: ifconfig can change the IP address of the default gateway
ioctl can now perform a request for a specific route and change
the address of it's default gateway.
2020-03-15 19:09:31 +01:00
Marios Prokopakis
8cf962a102
Userland: Set the mask of a network adapter with ifconfig (#1388)
A new IP address or a new network mask can be specified in the command
line arguments of ifconfig to replace the old values of a given network
adapter. Additionally, more information is being printed for each adapter.
2020-03-11 21:30:41 +01:00
Andreas Kling
0ba458cfa0 Kernel+LibC: Add SO_REUSEADDR macro
Note that this is not actually implemented, I'm just defining it.
2020-02-20 06:57:01 +01:00
Andreas Kling
2b0b7cc5a4 Net: Add a basic sys$shutdown() implementation
Calling shutdown prevents further reads and/or writes on a socket.
We should do a few more things based on the type of socket, but this
initial implementation just puts the basic mechanism in place.

Work towards #428.
2020-02-08 00:54:43 +01:00
joshua stein
868b1a24bb LibC: Move struct stat to sys/stat.h 2020-02-05 18:39:45 +01:00
Sergey Bugaev
b3a24d732d Kernel+LibC: Add sys$waitid(), and make sys$waitpid() wrap it
sys$waitid() takes an explicit description of whether it's waiting for a single
process with the given PID, all of the children, a group, etc., and returns its
info as a siginfo_t.

It also doesn't automatically imply WEXITED, which clears up the confusion in
the kernel.
2020-02-05 18:14:37 +01:00
Sergey Bugaev
a6cb7f759e Kernel+LibC: Add some Unix signal types & definitions 2020-02-05 18:14:37 +01:00
Sergey Bugaev
aafa5a9d09 LibC: Fix misplaced brace
It doesn't really make a difference since waitpid() is declared to have
extern "C" linkage in the header anyway, but still.
2020-02-05 18:14:37 +01:00
Sergey Bugaev
a6e7797a31 LibC: Move waitpid() to sys/wait.h
That's where POSIX says it should be.
2020-02-03 19:50:45 +01:00
Andreas Kling
65961d3ffc LibC: Add WSTOPSIG macro
This macro can be used on the "status" output from sys$waitpid() to
find out which signal caused the waitee process to stop.

Fixes #794.
2020-01-27 20:47:56 +01:00
Andreas Kling
23ffd6c319 Kernel+LibC+Userland: Switch to 64-bit time_t
Let's not have that 2038 problem people are talking about. :^)
2020-01-27 10:59:29 +01:00
Andreas Kling
94ca55cefd Meta: Add license header to source files
As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.

For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.

Going forward, all new source files should include a license header.
2020-01-18 09:45:54 +01:00
Andreas Kling
24c736b0e7 Kernel: Use the Syscall string and buffer types more
While I was updating syscalls to stop passing null-terminated strings,
I added some helpful struct types:

    - StringArgument { const char*; size_t; }
    - ImmutableBuffer<Data, Size> { const Data*; Size; }
    - MutableBuffer<Data, Size> { Data*; Size; }

The Process class has some convenience functions for validating and
optionally extracting the contents from these structs:

    - get_syscall_path_argument(StringArgument)
    - validate_and_copy_string_from_user(StringArgument)
    - validate(ImmutableBuffer)
    - validate(MutableBuffer)

There's still so much code around this and I'm wondering if we should
generate most of it instead. Possible nice little project.
2020-01-11 12:47:47 +01:00
joshua stein
f22322a06c LibC: move in_addr and sockaddr_in to netinet/in.h 2020-01-02 04:09:56 +01:00
Andreas Kling
2cbc3c6ee5 LibC+ping: Let's use the traditional timersub() et al prototypes
This also fixes the build, since ping.cpp already had a timersub().
2019-12-27 23:07:28 +01:00
Mauri de Souza Nunes
0e49c842de LibC: Add timeval operations
This commit add macros for the timeval operations timeradd, timersub,
timercmp, timerisset, timerclear.
2019-12-27 22:43:43 +01:00
Andreas Kling
4a8683ea68 Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t
This patch implements a simple version of the futex (fast userspace
mutex) API in the kernel and uses it to make the pthread_cond_t API's
block instead of busily sched_yield().

An arbitrary userspace address is passed to the kernel as a "token"
that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE
that specific userspace address.

FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used
for pthread_cond_signal() and pthread_cond_broadcast().

I'm pretty sure I'm missing something in this implementation, but it's
hopefully okay for a start. :^)
2019-12-25 23:54:06 +01:00
Andreas Kling
0c97380ee6 LibPthread+LibC: Support PTHREAD_MUTEX_RECURSIVE
This allows SDL to build against our native recursive mutex instead
of providing its own. Also it's just a nice feature to have. :^)
2019-12-22 14:25:41 +01:00
Andreas Kling
615553be5f LibPthread: Implement simple thread-specific keys
This patch adds pthread_key_create() and pthread_{get,set}specific().
There's a maximum of 64 thread-specific keys for simplicity.

Key destructors are not invoked on thread exit.
2019-12-07 15:21:18 +01:00
Andreas Kling
9ddfe694f2 LibPthread: Implement pthread_mutexattr_init() and _destroy() 2019-12-07 14:52:27 +01:00
Andreas Kling
cc1ef6dadb LibPthread: Implement condition variables
This feels like a pretty naive implementation, but I think it can work.
Basically each waiter creates an object on its stack that is then
added to a linked list inside by the pthread_cond_t.

Signalling is then done by walking the list and unsetting the "waiting"
flag on as many of the waiters as you like.
2019-12-07 14:52:27 +01:00
Andreas Kling
23e802518d Kernel: Add getsockopt(SO_PEERCRED) for local sockets
This sockopt gives you a struct with the PID, UID and GID of a socket's
peer process.
2019-12-06 18:38:36 +01:00
Andrew Kaster
618aebdd8a Kernel+LibPthread: pthread_create handles pthread_attr_t
Add an initial implementation of pthread attributes for:
  * detach state (joinable, detached)
  * schedule params (just priority)
  * guard page size (as skeleton) (requires kernel support maybe?)
  * stack size and user-provided stack location (4 or 8 MB only, must be aligned)

Add some tests too, to the thread test program.

Also, LibC: Move pthread declarations to sys/types.h, where they belong.
2019-11-18 09:04:32 +01:00
Calvin Buckley
92953ba2f3 LibC: Add missing u_* typedefs (u_char/u_short) 2019-10-13 08:44:24 +02:00
Vincent Sanders
904bd3b441 Libc: make library internal includes come from private include namespace 2019-10-11 12:17:05 +02:00
Andreas Kling
3f2c1a2e3d Kernel: Add SIOCGIFHWADDR ioctl to get the MAC address of an adapter 2019-10-02 18:20:11 +02:00
Andreas Kling
2482fc3538 IPv4: Implement socket ioctls SIOCGIFADDR and SIOCSIFADDR
This allows userspace programs to get and set (superuser-only) the IPv4
address of a network adapter. :^)
2019-09-23 19:06:03 +02:00
Andreas Kling
a3575f3c60 LibC: Fix warnings in sys/cdefs.h if __BEGIN_DECLS is already defined 2019-09-23 18:58:12 +02:00
Andreas Kling
8cfb859368 IPv4: Support overriding the default TTL (64)
Made getsockopt() and setsockopt() virtual so we can handle them in the
various Socket subclasses. The subclasses map kinda nicely to "levels".

This will allow us to implement things like "traceroute", although..
I spent some time trying to do that, but then hit a wall when it turned
out that the user-mode networking in QEMU doesn't preserve TTL in the
ICMP packets passing through.
2019-09-19 21:42:59 +02:00
Conrad Pankoff
5e46122a82 Kernel: Add framebuffer ioctls; wrap raw ioctls with a C API 2019-08-18 07:40:02 +02:00
Conrad Pankoff
1868523e00 LibC: Move duplicated winsize struct definition into ioctl_numbers.h 2019-08-18 07:40:02 +02:00
Andreas Kling
de03b72979 LibC: Add WIFSTOPPED() macro in <sys/wait.h>. 2019-07-14 11:31:53 +02:00
Andreas Kling
04b9dc2d30 Libraries: Create top level directory for libraries.
Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.
2019-07-04 16:16:50 +02:00