This patch enables the fork.run script to run on base-linux. It should
be regarded as an interim solution, however, because the randomization
performed by the Linux kernel may still - by chance - produce a
situation where one of the libc's malloc heap regions intersects with
another dataspace dynamically attached to the child.
The better solution would be to make the 'Region_map_mmap'
implementation not depend on the kernel's allocation policy by using a
locally implemented allocator.
Issue #3478
This patch extends the fork test with explicit checks for the cloned
content of the heap and RW segment as well as the seek position of an
open file descriptor. It adds the new libports/run/fork.run script
that exercises the fork mechanism implemented by the libc. It is based
on noux_fork.run, which tests the mechansim provided by noux. The
test program has been moved from ports to libports.
Issue #3478
The libc already supports the configuration of 'stdin', 'stdout', and
'stderr' using '<libc>' config attributes. This patch equips the libc
with the additional ability to pre-initialize any other file descriptor.
A file descriptor is configured as follows:
<config>
...
<libc ...>
<fd id="3" path="/dev/log" writeable="yes" readable="no" seek="10"/>
...
</libc>
</config>
Furthermore, this patch moves the FD initialization code from the VFS
plugin to the libc kernel initialization because opening the FDs
depends on 'malloc' ('strdup'), which should not be used at early
'Libc::Kernel' initialization time.
Issue #3478
This patch replaces the former use of an Allocator_avl with the Id_space
utility, which is safer to use and allows for the iteration of all
elements. The iteration over open file descriptors is needed for
implementing 'fork'.
Issue #3478
The new 'Heap::for_each_region' method provides information about the
heap's used virtual-memory regions. This method allows for the
mirroring of the heap state as needed by 'fork'.
Issue #3478
By specifying the config attribute 'check_ctors="no"', the dynamic
linker won't abort the program on a missing call of
'Env::exec_static_constructors'. This is the case for forked programs
where the ctors were already executed by the forking program prior the
fork operation.
Issue #3478
This patch enhances the 'base/shared_object.h' interface of the dynamic
linker with the function 'for_each_loaded_object', which allows the
caller to obtain information about the currently loaded binary and
shared libraries.
The new interface is a base mechanism needed for implementing 'fork' in
the libc.
Issue #3478
By using Genode::strncpy instead of the libc's strncpy, we cannot end up
in the situation where the result lacks the zero termination (where the
number of charactors equals the destination buffer size).
This patch handles the case where a PD's cap quota becomes exhausted
on the attempt to transfer caps via 'Env::pd().transfer_quota'. The
solution mirrors the existing code for RAM quota.
Prior this patch, the 'transfer_quota' operation would trigger an
'Out_of_caps' exception.
These are time-type conversion functions (including leap years and
seconds) taken from musl-libc git rev
c82d3bada30cb27e14abda7859da5d2e784830ff with some adaptions. Musl is
licensed under permissive MIT license.
Issue #3450
A client may register a signal handler to be notified whenever the
RTC value was changed, i.e., a mis-configured clock was synchronized,
by calling 'set_sigh()'.
Issue #3450
The GEMDOS variant is supported by NetBSD's msdos file-system driver.
However, it must explicitly be enabled by a mount flag. This patch
adds the principle ability for passing mount flags to file system
drivers and enables the MSDOSFSMNT_GEMDOSFS flag based on the
config attribute 'gemdos="yes"'.
Issue #3471
This patch enhances part_block with support for parsing the AHDI
partition scheme, and the detection of the GEMDOS variant of FAT as used
by Atari TOS. As a side effect of the implementation, the patch improves
the MBR parsing code by avoiding pointers and using const qualifiers.
Fixes#3470
