_IO_proc_open
_IO_proc_open(this, command, (mode & ios::in) ? "r" : "w");
return (procbuf*)_IO_proc_open(this, command, (mode & ios::in) ? "r" : "w");
versioned_symbol (libc, _IO_new_proc_open, _IO_proc_open, GLIBC_2_1);
extern _IO_FILE* _IO_proc_open (_IO_FILE *, const char *, const char *)