This patch implements the POSIX signal functionality needed to interrupt a
running Noux GDB by pressing 'Ctrl-C'.
It allows to register a signal handler for the 'SIGINT' signal, which
gets executed after 'Ctrl-C' is received from the terminal. With the
current state of the implementation, the signal handler only gets executed
when the Noux application calls a 'read()', 'write()', 'ftruncate()' or
'select()' syscall.
Fixes#923.
Since the number of the fds in the select call is not necassarily equal
to the number of fds SYSCALL_SELECT returns we have to reset the number
of fds given as argument to select().
This keeps OpenSSH from reading from a non-ready socket.
Fixes#494.
The previous implementation disregards the fact that we actually have
to use libc's plugin mechanism if we play with fds. So in the end the
libc did not know to which plugin the fd belonged.
Fixes#493.
Since FD_ZERO() resets a whole fd_set (which is 128 bytes) using it to
reset dst_fds will override otherwise used memory if the memory was
allocated dynamically and is less than sizeof (fd_set). So instead of
using this macro we reset the fd_set manually.
There are certain programs that need gettimeofday(), e.g.
network-related tools like ping(1) etc. but also filesystem-related
programs like find(1) etc. and of course time-related programs like
date(1).
As there is currently no interface in Genode for actually using clock
devices like RTC on x86 (though there is a driver for it) we "abuse"
the timeout_scheduler thread to at least provide flow-of-time.
Noux: add clock_gettime() implementation
For now, only CLOCK_SECOND is supported.
Noux: add utimes() dummy
Fixes#401
The 'find' program can abort if the 'gettimeofday()' function returns -1,
which it currently does. With this patch the 'gettimeofday()' returns a
dummy time instead to prevent such a termination.
Fixes#353.
With this patch environment variables always get stored as zero-separated
strings in buffers of type 'Sysio::Env'. This fixes the problem that
environment variables with non-alphanumeric characters did not get set
correctly in child processes.
Fixes#340.
Programs use the errno value to check which error exactly occured.
It is mandatory for non-blocking I/O, e.g. connect() gets the current
state of the connection by looking at the returned errno values.
Fixes#337.
There are certain programs which need the information that is stored in
'struct passwd'. This commit introduces configurable user information
support to NOUX.
One can set the user information via <user> in NOUX config:
! <config>
! <user name="baron" uid="1" gid="1">
! <shell name="/bin/bash" />
! <home name="/home" />
! </user>
! [...]
! </config>
When <user> is not specified default values are used. Currently these
are 'root', 0, 0, '/bin/bash', '/'.
Note: this is just a single user implementation because each Noux instance
has only one user or rather one identity and there will be no complete
multi-user support in Noux. If you need different users, just start new
Noux instances for each of them.
Previously there was not actual timeout handling. If a select() call
set an timeout it would be set to zero instead and was always handled
as blocking i/o. While this works fine for file descriptors which
will be triggerd externally (for example vim through terminal i/o) it
does not work at all for socket descriptors and network operations in
general.
So this commit introduces proper timeout handling and changes the
behaviour of SYSCALL_SELECT so that it now returns more than just
one descriptor at a time.
noux/minimal and noux/net now depend on thread and alarm libraries.
In the current form, only PROT_READ is supported. This case is emulated
by copying the file content into new allocated backing store. Even
though the performance benefits of mmap-using code will not be
preserved, code that relies on mmap can be executed via the libc_noux
or libc_fs plugins, i.e. lightttpd.
This patch adds a new "terminal" file system type to Noux, which allows to
create a "character device" file that is connected to a Genode 'Terminal'
service.
The 'Terminal' session created by the file system has the label
"noux(terminal_fs)" to distinguish it from the 'Terminal' session
created by Noux itself.
Fixes#244.
The sysio's struct fields need to be properly set on each syscall. This
fixes a bug where the wrong fd is used after the first sendto syscall.
Also the minimal buffer size calculation uses the wrong size.
Fixes#235.
Noux/net adds network functionality to noux. Currently most basic
network related system calls including 'accept', 'bind', 'connect',
'listen', 'recv', 'send', 'shutdown', and 'socket' are implemented by
wrapping lwip's network functions.
At the moment noux/net is rarely usable, though it is possible to
use netcat to send a message to a netcat server which listen on a
given port in noux/net.
The new 'genode_envp' variable declared in '_main.cc' allows libc
plugins to supplying custom environment pointers to the main function.
This is needed by 3rd-party software such as GNU make, which expects the
environment pointer as third argument of the main function.
This patch introduces support for stacked file systems alongside new
glue for accessing file-system implementations provided via Genode's
new file-system-session interface.
Using stacked file systems, an arbitrary number of file systems (such
as tar archives or file systems implemented as separate Genode
components) can be composed to form one merged virtual file system.
An example is given via the 'ports/run/noux_bash.run' script. This run
script creates a virtual file system out of multiple tar archives each
containing the content of a particular GNU package. In addition, one
'ram_fs' is mounted, which enables Noux to perform write operations.
This way, the shell output can be redirected to a file, or files can
be saved in VIM.
Fixes#103.
The 'copy_to' function turned out to be not flexible enough to
accommodate the Noux fork mechanism. This patch removes the function,
adds an accessor for the capability destination and a compound type
'Native_capability::Raw' to be used wherever plain capability
information must be communicated.
This patch removes the hardcoded parent cap for the new child by
introducing a facility called 'poke' similar to copy-to-user. This
change makes the fork mechanism kernel-agnostic. The 'noux_fork'
test works on L4/Fiasco, OKL4, NOVA, Fiasco.OC, and L4ka::Pistachio.
Linux is not supported yet.
The resource virtualization layer has been extended to support sub RM
sessions because this feature is used by the dynamic linker. Currently,
the address space of the forking process is copied eagerly. However,
different dataspace types are treated differently. For example, only RAM
dataspaces are copied but no ROM dataspaces.
At the libc side, a setjmp/longjmp-based trampoline mechanism is used to
implement the continuation of the main thread inside the new process.
This procedure is also responsible for re-establishing the relationship
to the new process' parent as well as its Noux session.
This version is still in flux and has many rough edges. It is tied to
OKL4 for now.
