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# ====================================================================
#
#      signals.cdl
#
#      C library signal related configuration data
#
# ====================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
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# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):      jlarmour
# Contributors:
# Date:           2000-04-14
#
#####DESCRIPTIONEND####
#
# ====================================================================

cdl_package CYGPKG_LIBC_SIGNALS {
    display       "ISO C library signal functions"
    description   "
            This component controls signal functionality,
            as implemented in ISO/IEC 9899:1990 chapter 7.7 with
            the signal() and raise() functions. As well as
            allowing a program to send itself signals, it is
            also possible to cause hardware exceptions to
            be signalled to the program in a similar way."
    doc           ref/libc.html
    include_dir   cyg/libc/signals
    parent        CYGPKG_LIBC
    implements    CYGINT_ISO_SIGNAL_NUMBERS
    implements    CYGINT_ISO_SIGNAL_IMPL
    requires      { CYGBLD_ISO_SIGNAL_NUMBERS_HEADER == \
                    "<cyg/libc/signals/signal.h>" }
    requires      { CYGBLD_ISO_SIGNAL_IMPL_HEADER == \
                    "<cyg/libc/signals/signal.h>" }
    requires      CYGPKG_ISOINFRA
    compile       raise.cxx   siginit.cxx   signal.cxx

# ====================================================================

    cdl_option CYGSEM_LIBC_SIGNALS_THREAD_SAFE {
        display       "Thread safe signals"
        requires      CYGPKG_KERNEL
        default_value 1
        description   "
            Because signal handlers are global, and not
            thread-specific (as mandated by POSIX 1003.1)
            it is possible for multiple threads to clash
            and corrupt data if setting the same signal
            handler at the same time. With this option
            enabled, a kernel mutex will be used to protect
            the shared data."
    }

    cdl_component CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS {
        display       "Hardware exceptions cause signals"
        flavor        bool
        requires      CYGSEM_KERNEL_EXCEPTIONS_GLOBAL
        requires      CYGSEM_KERNEL_EXCEPTIONS_DECODE
        default_value 0
        description   "
            This causes hardware exceptions like
            arithmetic exceptions (e.g. divide by zero)
            or bad memory accesses to be passed through as
            signals. It is thus possible for a program to
            handle these exceptions in a generic way using
            the appropriate signal handlers. The details of
            exactly which exceptions are passed through
            under what circumstances depend on the
            underlying HAL implementation. Consequently it
            must be remembered that signal handlers cannot
            be guaranteed to be invoked in the expected
            circumstances if you do not know about the
            underlying HAL implementation - it is possible
            that the architecture is unable to detect that
            exception."
    
        cdl_option CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS {
            display       "Chain old exception handlers"
            default_value 1
            description   "
                When hardware exceptions are generated, it
                is possible to chain into the old kernel exception
                handler before calling any registered signal
                handler. If this is not required, disable this
                option and only the signal handler will be
                called when this exception occurs. Disabling
                this option will also save some space and code
                usage."
        }
    }
    
    cdl_component CYGPKG_LIBC_SIGNALS_INLINE {
        display       "Inline versions of functions"
        flavor        none
        description   "
            Some functions can be made inline instead of
            being function calls. These can be set here."
    
        cdl_option CYGIMP_LIBC_SIGNALS_RAISE_INLINE {
            display       "raise()"
            default_value 1
            description   "
                Enabling this option makes raise() an inline function."
        }
    
        cdl_option CYGIMP_LIBC_SIGNALS_SIGNAL_INLINE {
            display       "signal()"
            default_value 1
            description   "
                Enabling this option makes signal() an inline function."
        }
    }
    
    cdl_component CYGPKG_LIBC_SIGNALS_ERROR_HANDLING {
        display       "Error handling"
        flavor        none 
        description   "
            You may or may not want errno to be set by
            certain functions. Not using errno could save
            both space, code, and avoid worrying about
            interactions between multiple threads when
            setting it."
    
        cdl_option CYGSEM_LIBC_SIGNALS_BAD_SIGNAL_FATAL {
            display       "Bad signal fatal"
            requires      CYGDBG_USE_ASSERTS
            default_value 0
            description   "
                Enabling this option will cause an assertion
                failure if the signal handling code is
                passed a bad signal. Otherwise an error will
                be returned, or in the case of a
                hardware-generated exception it will be silently
                ignored."
        }
    
        cdl_option CYGSEM_LIBC_SIGNALS_RAISE_SETS_ERRNO {
            display       "raise() sets errno"
            requires      CYGINT_ISO_ERRNO
            requires      CYGINT_ISO_ERRNO_CODES
            default_value 1
            description   "
                You may or may not want errno to be set by
                raise() on error conditions. Not using errno
                could save both space, code, and avoid worrying
                about interactions between multiple threads when
                setting it. Strictly ISO C does not mandate
                that errno be set by raise()."
        }
    
        cdl_option CYGSEM_LIBC_SIGNALS_SIGNAL_SETS_ERRNO {
            display       "signal() sets errno"
            requires      CYGINT_ISO_ERRNO
            requires      CYGINT_ISO_ERRNO_CODES
            default_value 1
            description   "
                You may or may not want errno to be set by
                signal() on error conditions. Not using errno
                could save both space, code, and avoid worrying
                about interactions between multiple threads when
                setting it. Strictly ISO C mandates
                that errno be set by signal()."
        }
    }
    
    cdl_component CYGPKG_LIBC_SIGNALS_TRACING {
        display       "Tracing"
        flavor        none
        description   "
            These options control the trace output for the C
            library internal signal implementation."
    
        cdl_option CYGNUM_LIBC_SIGNALS_RAISE_TRACE_LEVEL {
            display       "Default trace level for raise()"
            flavor        data
            legal_values  0 to 1
            default_value 0
            description   "
                This gives the default tracing level for the
                raise() function. Higher numbers are more
                verbose."
        }
    
        cdl_option CYGNUM_LIBC_SIGNALS_HWHANDLER_TRACE_LEVEL {
            display       "Default hardware exception handler trace level"
            flavor        data
            legal_values  0 to 1
            default_value 0
            description   "
                This gives the default tracing level for the
                hardware exception handler function (if enabled).
                Higher numbers are more verbose."
        }
    }
    
# ====================================================================

    cdl_component CYGPKG_LIBC_SIGNALS_OPTIONS {
        display "C library signal functions 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_SIGNALS_CFLAGS_ADD {
            display "Additional compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the C library. These flags are used in addition
                to the set of global flags."
        }

        cdl_option CYGPKG_LIBC_SIGNALS_CFLAGS_REMOVE {
            display "Suppressed compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the C library. These flags are removed from
                the set of global flags if present."
        }

        cdl_option CYGPKG_LIBC_SIGNALS_TESTS {
            display "C library signal function tests"
            flavor  data
            no_define
            calculated { 
                "tests/signal1"
                . ((CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS) ? " tests/signal2" : "")
            }
            description   "
                This option specifies the set of tests for the C library
                signal functions."
        }
    }
}

# ====================================================================
# EOF signals.cdl