I'm having an error related to yours: when I call writeln
function in a closed stdout I will get a segfault message.
Example:
import std.stdio;
void main() {
stdout.close();
write("hello\n");
}
The code above will crash with segfault buf the following code
will raise an exception instead:
import std.stdio;
void main() {
stdout.close();
stdout.write("hello\n");
}
In one of the specializations of the write function in the
std.stdio (the call site that you showed in your post) no check
for closed stdout (when stdout._p is null) is done. I can't say
if this is a bug in the write function or the desired behaviour
(I'm a novice here).
On Wednesday, 3 September 2014 at 18:48:00 UTC, Szymon Gatner
wrote:
On Wednesday, 3 September 2014 at 09:55:55 UTC, Szymon Gatner
wrote:
Hey,
I am trying to build hybrid (C++, D) application (more here:
http://forum.dlang.org/thread/ugkpqprobonorbdun...@forum.dlang.org)
but I am now getting assertion failure from within writeln().
writeln() is called from a D function that has C++ linkage:
D definition:
extern (C++) void printSomething()
{
writeln("hello from D");
}
usage from C++:
extern "C++" void printSomething();
int main()
{
DRuntime druntime; // rt_init(), rt_term()
printSomething();
}
this causes run-time assertion in fprintf() called from within
writeln():
int __cdecl fprintf (
FILE *str,
const char *format,
...
)
/*
* 'F'ile (stream) 'PRINT', 'F'ormatted
*/
{
va_list(arglist);
FILE *stream;
int buffing;
int retval=0;
_VALIDATE_RETURN( (str != NULL), EINVAL, -1); <=== assetion
here
[...]
}
meaning that str arg passed is null. writelns()'s call site:
enforce(fprintf(.stdout._p.handle, "%.*s\n",
cast(int) args[0].length, args[0].ptr)
>= 0);
so for some reason .stdout._p.handle is null.
Any ideas why this happens?
