System: Pentium 4, Win32, gcc 3.3.3 cygwin
Does anyone know of a mechanism whereby C library functions can be made
to throw a (C++) exception in case a call fails? This would obviate
having to check the results of function calls individually at the point
of call.
I would also be nice to be able to specify that (some) floating point
IEEE 754 "exceptions " throw C++ exceptions (some of the time).
I note that the glibc documentation suggests that "traps" may be
enabled to cause fp "exceptions " to generate a SIGFPE signal. This
suggests a possible workaround whereby a signal handler could catch the
SIGFPE signal and throw an exception (OTOH I have heard that signals
and C++ exceptions do not necessarilly mix well). This is academic, as
I have not found a way - perhaps it is not possible - to enable fp
traps for my system.
Any help/ideas appreciated,
--
Lionel B 2 1510
On 7 Oct 2004 03:13:43 -0700, "Lionel B" <go****@lionelb .com> wrote: System: Pentium 4, Win32, gcc 3.3.3 cygwin
Does anyone know of a mechanism whereby C library functions can be made to throw a (C++) exception in case a call fails? This would obviate having to check the results of function calls individually at the point of call.
I would also be nice to be able to specify that (some) floating point IEEE 754 "exceptions " throw C++ exceptions (some of the time).
I note that the glibc documentation suggests that "traps" may be enabled to cause fp "exceptions " to generate a SIGFPE signal. This suggests a possible workaround whereby a signal handler could catch the SIGFPE signal and throw an exception (OTOH I have heard that signals and C++ exceptions do not necessarilly mix well). This is academic, as I have not found a way - perhaps it is not possible - to enable fp traps for my system.
Any help/ideas appreciated,
To catch system-generated exceptions in your code, you need to use
C-style SEH (structured exception handling). Then, you need to wrap
the C functions in C++ functions which check the return value, then
throw something appropriate as a C++ exception.
It is possible that cygwin already does something under the covers
with SEH; check your documentation for details.
--
Bob Hairgrove No**********@Ho me.com
Bob Hairgrove wrote: On 7 Oct 2004 03:13:43 -0700, "Lionel B" <go****@lionelb .com> wrote:
System: Pentium 4, Win32, gcc 3.3.3 cygwin
Does anyone know of a mechanism whereby C library functions can be
madeto throw a (C++) exception in case a call fails? This would obviate having to check the results of function calls individually at the
pointof call.
I would also be nice to be able to specify that (some) floating
pointIEEE 754 "exceptions " throw C++ exceptions (some of the time).
/snip/
To catch system-generated exceptions in your code, you need to use C-style SEH (structured exception handling). Then, you need to wrap the C functions in C++ functions which check the return value, then throw something appropriate as a C++ exception.
For the non-floating point errors, if I'm going to write C++ wrappers
which check return values for the functions I am interested in - a
reasonable (if tedious) solution, I guess - it seems to me I shouldn't
have to get into SEH issues (a Good Thing, as far as I'm concerned - a
brief look has convinced me that trying to combine SEH with C++
exception handling would be nightmarish).
It is possible that cygwin already does something under the covers with SEH; check your documentation for details.
Couldn't find anything relevant to my query in docs or mailing list
archives. Perhaps a re-post to the Cygwin mailing list might be in
order.
Thanks,
--
Lionel B This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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