On C++, conflict between strstream variable and popen() func

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1

Someone knows
why defining a strstream variable and using a popen() a SIGCHLD arrived ?

example:
…
…
stream problem(static_buf,2048);
…
…
void main(int argc, char **argv)
…
…
fd=popen(cmd,“r”);
while (!feof(fp))
{
fscanf(fp, “%s “, stringa);
// printf(”%s”,stringa);
}
…
…

during the while () loop a SIGCHLD arrived !!!.
(this is not true if you comment the strstream variable.)

Does someone know why ???

Thank’s in advance.