genode/repos/gems/src/server/file_terminal
Norman Feske 4da52517c1 Simpify startup of dynamically linked binaries
This patch removes the component_entry_point library, which used to
proved a hook for the libc to intercept the call of the
'Component::construct' function. The mechansim has several shortcomings
(see the discussion in the associated issue) and was complex. So we
eventually discarded the approach in favor of the explicit handling of
the startup.

A regular Genode component provides a 'Component::construct' function,
which is determined by the dynamic linker via a symbol lookup.
For the time being, the dynamic linker falls back to looking up a 'main'
function if no 'Component::construct' function could be found.

The libc provides an implementation of 'Component::construct', which
sets up the libc's task handling and finally call the function
'Libc::Component::construct' from the context of the appllication task.
This function is expected to be provided by the libc-using application.
Consequently, Genode components that use the libc have to implement the
'Libc::Component::construct' function.

The new 'posix' library provides an implementation of
'Libc::Component::construct' that calls a main function. Hence, POSIX
programs that merely use the POSIX API merely have to add 'posix' to the
'LIBS' declaration in their 'target.mk' file. Their execution starts at
'main'.

Issue #2199
2017-01-13 13:06:52 +01:00
..
main.cc base: avoid use of deprecated base/printf.h 2016-08-29 17:27:10 +02:00
README Make label prefixing more strict 2016-11-30 13:37:07 +01:00
target.mk Simpify startup of dynamically linked binaries 2017-01-13 13:06:52 +01:00

File terminal is a service that provides a terminal-session interface and
redirects the terminal input and output to a file.

! <config>
!   <policy label_prefix="client1" filename="test.txt" />
!   <policy label_prefix="client2" filename="file.dat" io_buffer_size="4K"/>h
!   <libc stdout="/dev/log">
!     <vfs>
!       <dir name="dev"> <log/> </dir>
!       <fs/>
!     </vfs>
!   </libc>
! </config>

To keep things simple, a client can only open one file at the moment.