/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "io_util.h"

#include "io_util_md.h"

#include <string.h>

void

fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags)

{

    WITH_PLATFORM_STRING(env, path, ps) {

        FD fd;

#ifdef __linux__

        /* Remove trailing slashes, since the kernel won't */

        char *p = (char *)ps + strlen(ps) - 1;

        while ((p > ps) && (*p == '/'))

            *p-- = '\0';

#endif

        fd = JVM_Open(ps, flags, 0666);

        if (fd >= 0) {

            SET_FD(this, fd, fid);

        } else {

            throwFileNotFoundException(env, path);

        }

    } END_PLATFORM_STRING(env, ps);

}

void

fileClose(JNIEnv *env, jobject this, jfieldID fid)

{

    FD fd = GET_FD(this, fid);

    if (fd == -1) {

        return;

    }

    /* Set the fd to -1 before closing it so that the timing window

     * of other threads using the wrong fd (closed but recycled fd,

     * that gets re-opened with some other filename) is reduced.

     * Practically the chance of its occurance is low, however, we are

     * taking extra precaution over here.

     */

    SET_FD(this, -1, fid);

    /*

     * Don't close file descriptors 0, 1, or 2. If we close these stream

     * then a subsequent file open or socket will use them. Instead we

     * just redirect these file descriptors to /dev/null.

     */

    if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {

        int devnull = open("/dev/null", O_WRONLY);

        if (devnull < 0) {

            SET_FD(this, fd, fid); // restore fd

            JNU_ThrowIOExceptionWithLastError(env, "open /dev/null failed");

        } else {

            dup2(devnull, fd);

            close(devnull);

        }

    } else if (JVM_Close(fd) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "close failed");

    }

}