/** @inheritDoc */
public int available(int fd) throws IOException {
int err = ioctl.ioctl(fd, Ioctl.FIONREAD, availableBuf.address().toUWord().toPrimitive());
int result = availableBuf.getInt(0);
LibCUtil.errCheckNeg(err);
if (DEBUG) {
System.err.println("available(" + fd + ") = " + result);
}
return result;
}
private void set_blocking_flags(int fd, boolean is_blocking) throws IOException {
if (tryFcntl) {
int flags = libc.fcntl(fd, LibC.F_GETFL, 0);
if (DEBUG) {
System.out.println("set_blocking_flags: fcntl F_GETFL = " + flags);
}
if (flags >= 0) {
if (is_blocking == true) {
flags &= ~LibC.O_NONBLOCK;
} else {
flags |= LibC.O_NONBLOCK;
}
if (DEBUG) {
System.out.println("set_blocking_flags: calling fcntl F_SETFL flags: " + flags);
}
int res = libc.fcntl(fd, LibC.F_SETFL, flags);
if (res != -1) {
return;
}
} else if (LibCUtil.errno() == LibC.EOPNOTSUPP) {
tryFcntl = false; // once this fails, don't try again
}
}
if (!tryFcntl) {
if (DEBUG) {
System.out.println("set_blocking_flags: calling ioctl FIONBIO = " + !is_blocking);
}
IntByReference setting =
new IntByReference(is_blocking ? 0 : 1); /* if "is_blocking"==true, NBIO = FALSE */
int res = ioctl.ioctl(fd, Ioctl.FIONBIO, setting);
setting.free();
if (DEBUG) {
System.out.println("set_blocking_flags: ioctl returned: " + res);
}
if (res >= 0) {
return;
}
}
throw newError(fd, "set_blocking_flags");
}