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# ====================================================================
#
# startup.cdl
#
# ISO environment startup/termination related configuration data
#
# ====================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
##
## eCos is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free
## Software Foundation; either version 2 or (at your option) any later version.
##
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License along
## with eCos; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
##
## As a special exception, if other files instantiate templates or use macros
## or inline functions from this file, or you compile this file and link it
## with other works to produce a work based on this file, this file does not
## by itself cause the resulting work to be covered by the GNU General Public
## License. However the source code for this file must still be made available
## in accordance with section (3) of the GNU General Public License.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
##
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
## at http://sources.redhat.com/ecos/ecos-license/
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s): jlarmour
# Contributors:
# Date: 2000-04-14
#
#####DESCRIPTIONEND####
#
# ====================================================================
cdl_package CYGPKG_LIBC_STARTUP {
display "ISO environment startup/termination"
description "
This package manages the control of the
environment (in the general sense) that an
application would require for full ISO C / POSIX
compatibility, including a main() entry point
supplied with arguments and an environment
(as retrievable by the getenv() function).
It also includes at the other end of things,
what happens when main() returns or exit() is
called."
doc ref/c-library-startup.html
include_dir cyg/libc/startup
parent CYGPKG_LIBC
requires CYGPKG_ISOINFRA
requires { CYGINT_LIBC_STARTUP_CONTEXT == 1 }
implements CYGINT_ISO_EXIT
implements CYGINT_ISO_MAIN_STARTUP
implements CYGINT_ISO_ENVIRON
compile _exit.cxx abort.cxx atexit.cxx \
environ.cxx exit.cxx invokemain.cxx \
main.cxx mainthread.cxx
compile -library=libextras.a cstartup.cxx
# ====================================================================
cdl_interface CYGINT_LIBC_STARTUP_EXTERNAL_INVOKE_MAIN_POSSIBLE {
display "main() can be invoked elsewhere"
description "Implementors of this interface show that they
allow main() to be invoked elsewhere."
flavor bool
no_define
}
cdl_option CYGDAT_LIBC_ARGUMENTS {
display "Arguments to main()"
flavor data
default_value {"{\"\", NULL}"}
description "
This option allows the setting of the arguments
to the main function. This only has any effect
when cyg_iso_c_start() is used to start the
ISO C compatibility. This will automatically
invoke main() in an ISO C compatible fashion.
This option is in fact used as argv, and so is
an n-tuple of string constants. The final
entry must be NULL. Conventionally if argv\[0\]
is supplied, it is used to inform the program
of its name."
}
cdl_component CYGPKG_LIBC_STARTUP_CONTEXT {
display "Startup context for main()"
flavor none
no_define
description "This component describes the options available for
what context main() is invoked in, such as in a thread
etc."
cdl_interface CYGINT_LIBC_STARTUP_CONTEXT {
display "Startup context implementors"
no_define
}
cdl_option CYGSEM_LIBC_STARTUP_MAIN_INITCONTEXT {
display "Invoked from initialization context"
description "With this option selected, main() will be
called via cyg_user_start() (unless the program
overrides the default cyg_user_start()). This
means it is run in the context of the system
initialization code, without the eCos kernel
scheduler running, and using the startup stack.
This means that any functions that may require
interactions with a running kernel will not
work (including libc functions, if configured
to be thread safe for example), so you should
restrict yourself to only calling fully
re-entrant functions from within main() in
this case."
flavor bool
default_value { 0 == CYGPKG_KERNEL && 0 ==
CYGINT_LIBC_STARTUP_EXTERNAL_INVOKE_MAIN_POSSIBLE }
implements CYGINT_LIBC_STARTUP_CONTEXT
implements CYGINT_LIBC_STARTUP_MAIN_NO_STACK_SIZE
}
cdl_component CYGSEM_LIBC_STARTUP_MAIN_THREAD {
display "Invoked as eCos thread"
requires CYGPKG_KERNEL
flavor bool
default_value { 0 != CYGPKG_KERNEL && 0 == \
CYGINT_LIBC_STARTUP_EXTERNAL_INVOKE_MAIN_POSSIBLE }
implements CYGINT_LIBC_STARTUP_CONTEXT
description "
With this option selected, main() is invoked from an eCos
thread."
cdl_option CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM {
display "System provides stack for main()'s thread"
description "
This option controls whether the stack of
main()'s thread is provided by the application or
provided by the system. When disabled, the
application must declare a pointer variable
cyg_libc_main_stack which is a pointer to an
appropriately aligned region of memory. The
application must also declare a variable of
type `int' called cyg_libc_main_stack_size
which contains the size of the stack in bytes.
This must be a multiple of 8."
flavor bool
default_value 1
}
cdl_option CYGNUM_LIBC_MAIN_THREAD_PRIORITY {
display "Priority of main()'s thread"
description "
This option is used to provide the thread
priority which main()'s thread runs at. Be
sure to check that this number is appropriate
for the kernel scheduler chosen. Different
kernel schedulers impose different restrictions
on the usable priorities."
flavor data
legal_values 0 to 0x7fffffff
default_value 10
}
}
cdl_option CYGSEM_LIBC_STARTUP_MAIN_OTHER {
display "Invoked elsewhere"
description "With this option selected, main() must be
invoked by a separate package, or by the user."
flavor bool
default_value { 0 != \
CYGINT_LIBC_STARTUP_EXTERNAL_INVOKE_MAIN_POSSIBLE }
requires CYGINT_LIBC_STARTUP_EXTERNAL_INVOKE_MAIN_POSSIBLE
implements CYGINT_LIBC_STARTUP_CONTEXT
}
}
cdl_interface CYGINT_LIBC_STARTUP_MAIN_NO_STACK_SIZE {
display "Don't allow main()'s stack size to be set"
description "This interface describes whether the stack size
value set in this package is supported by the
implementation that invokes main. If not, that
option is disabled."
flavor bool
no_define
}
cdl_option CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE {
display "main()'s default thread stack size"
flavor data
legal_values 16 to 0x7fffffff
default_value 8192
active_if !CYGINT_LIBC_STARTUP_MAIN_NO_STACK_SIZE
description "
This option sets the size of the stack used
in the context that invokes main(). For example,
with an eCos kernel, when the cyg_iso_c_start()
function is used to invoke the user-supplied
main() function in an ISO C compatible fashion,
a separate thread is created to call main().
This option controls the size of that thread's
stack, which is allocated in the BSS. It
must be a multiple of 8. Note, a low number
here may be overriden by the HAL if there is
a minimum requirement to process interrupts
etc. This option cannot be set if the implementation
that invokes main() does not use it."
}
cdl_component CYGFUN_LIBC_ATEXIT {
display "Include atexit() function"
flavor bool
default_value 1
description "
This option enables the use of the atexit()
function, and ensure that the atexit handlers
are invoked from within exit() as defined in
the ISO C standard."
cdl_option CYGNUM_LIBC_ATEXIT_HANDLERS {
display "Number of functions atexit() supports"
flavor data
legal_values 1 to 0x7fffffff
default_value 32
description "
This option sets the number of functions
that atexit() has room for. In other words,
the number of separate atexit() calls that
can be made before calling exit() or returning
from main() ( in an environment controlled by
cyg_iso_c_start() ). For strict compliance
with the ISO C standard this should be at
least 32."
}
}
cdl_option CYGSEM_LIBC_EXIT_CALLS_FFLUSH {
display "Make exit() call fflush()"
requires CYGINT_ISO_STDIO_FILEACCESS
default_value { 0 != CYGINT_ISO_STDIO_FILEACCESS }
description "
This option will ensure that all output
streams are flushed when exitting using
exit() as prescribed by the ISO C standard."
}
cdl_option CYGSEM_LIBC_EXIT_STOPS_SYSTEM {
display "_exit() stops all threads"
requires CYGPKG_KERNEL
default_value 0
description "
If this option is enabled then _exit(),
which is called from exit() which itself is
called on return from main(), stops the eCos
scheduler. For strict POSIX 1003.1
compatibility this would be the normal
behaviour. To allow the thread to simply
exit, without affecting other threads, simply
leave this option disabled. If there is no eCos
scheduler, then _exit() simply loops
irrespective of the setting of this option."
}
cdl_option CYGDAT_LIBC_DEFAULT_ENVIRONMENT {
display "Default environment"
flavor data
default_value {"{ NULL }"}
description "
This option allows the setting of the default
contents of the environment. This is in fact
the contents of the global environment pointer
char **environ defined by POSIX 1003.1. Strings
must be of the form NAME=VALUE, and the final
entry must be NULL."
}
cdl_option CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS {
display "Invoke default static constructors"
requires CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
requires { CYGSEM_LIBC_STARTUP_MAIN_THREAD || \
(CYGSEM_LIBC_STARTUP_MAIN_OTHER && CYGPKG_POSIX_PTHREAD) }
default_value 0
description "
This option causes the C library to call
static constructors with default priority
from within the context of the main() thread,
working with the co-operation of the HAL.
This may be needed for environments that
expect static constructors to be run in a
thread context. Note that this uses an object
with priority 65534. Therefore do not use
priority 65534 for any other static objects
with this option enabled."
}
# ====================================================================
cdl_component CYGPKG_LIBC_STARTUP_OPTIONS {
display "ISO environment startup/termination build options"
flavor none
no_define
description "
Package specific build options including control over
compiler flags used only in building this package,
and details of which tests are built."
cdl_option CYGPKG_LIBC_STARTUP_CFLAGS_ADD {
display "Additional compiler flags"
flavor data
no_define
default_value { "" }
description "
This option modifies the set of compiler flags for
building this package. These flags are used in addition
to the set of global flags."
}
cdl_option CYGPKG_LIBC_STARTUP_CFLAGS_REMOVE {
display "Suppressed compiler flags"
flavor data
no_define
default_value { "" }
description "
This option modifies the set of compiler flags for
building this package. These flags are removed from
the set of global flags if present."
}
cdl_option CYGPKG_LIBC_STARTUP_TESTS {
display "ISO environment startup/termination tests"
flavor data
no_define
calculated { "tests/atexit" }
description "
This option specifies the set of tests for this package."
}
}
}
# ====================================================================
# EOF startup.cdl