/*

 * 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 "jlong.h"

#include <stdio.h>

#include <string.h>

#include <dlfcn.h>

#include <errno.h>

#include <mntent.h>

#include "sun_nio_fs_LinuxNativeDispatcher.h"

typedef size_t fgetxattr_func(int fd, const char* name, void* value, size_t size);

typedef int fsetxattr_func(int fd, const char* name, void* value, size_t size, int flags);

typedef int fremovexattr_func(int fd, const char* name);

typedef int flistxattr_func(int fd, char* list, size_t size);

fgetxattr_func* my_fgetxattr_func = NULL;

fsetxattr_func* my_fsetxattr_func = NULL;

fremovexattr_func* my_fremovexattr_func = NULL;

flistxattr_func* my_flistxattr_func = NULL;

static jfieldID entry_name;

static jfieldID entry_dir;

static jfieldID entry_fstype;

static jfieldID entry_options;

static void throwUnixException(JNIEnv* env, int errnum) {

    jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",

        "(I)V", errnum);

    if (x != NULL) {

        (*env)->Throw(env, x);

    }

}

JNIEXPORT void JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_init(JNIEnv *env, jclass clazz)

{

    my_fgetxattr_func = (fgetxattr_func*)dlsym(RTLD_DEFAULT, "fgetxattr");

    my_fsetxattr_func = (fsetxattr_func*)dlsym(RTLD_DEFAULT, "fsetxattr");

    my_fremovexattr_func = (fremovexattr_func*)dlsym(RTLD_DEFAULT, "fremovexattr");

    my_flistxattr_func = (flistxattr_func*)dlsym(RTLD_DEFAULT, "flistxattr");

    clazz = (*env)->FindClass(env, "sun/nio/fs/UnixMountEntry");

    CHECK_NULL(clazz);

    entry_name = (*env)->GetFieldID(env, clazz, "name", "[B");

    CHECK_NULL(entry_name);

    entry_dir = (*env)->GetFieldID(env, clazz, "dir", "[B");

    CHECK_NULL(entry_dir);

    entry_fstype = (*env)->GetFieldID(env, clazz, "fstype", "[B");

    CHECK_NULL(entry_fstype);

    entry_options = (*env)->GetFieldID(env, clazz, "opts", "[B");

    CHECK_NULL(entry_options);

}

JNIEXPORT jint JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_fgetxattr0(JNIEnv* env, jclass clazz,

    jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)

{

    size_t res = -1;

    const char* name = jlong_to_ptr(nameAddress);

    void* value = jlong_to_ptr(valueAddress);

    if (my_fgetxattr_func == NULL) {

        errno = ENOTSUP;

    } else {

        /* EINTR not documented */

        res = (*my_fgetxattr_func)(fd, name, value, valueLen);

    }

    if (res == (size_t)-1)

        throwUnixException(env, errno);

    return (jint)res;

}

JNIEXPORT void JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_fsetxattr0(JNIEnv* env, jclass clazz,

    jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)

{

    int res = -1;

    const char* name = jlong_to_ptr(nameAddress);

    void* value = jlong_to_ptr(valueAddress);

    if (my_fsetxattr_func == NULL) {

        errno = ENOTSUP;

    } else {

        /* EINTR not documented */

        res = (*my_fsetxattr_func)(fd, name, value, valueLen, 0);

    }

    if (res == -1)

        throwUnixException(env, errno);

}

JNIEXPORT void JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_fremovexattr0(JNIEnv* env, jclass clazz,

    jint fd, jlong nameAddress)

{

    int res = -1;

    const char* name = jlong_to_ptr(nameAddress);

    if (my_fremovexattr_func == NULL) {

        errno = ENOTSUP;

    } else {

        /* EINTR not documented */

        res = (*my_fremovexattr_func)(fd, name);

    }

    if (res == -1)

        throwUnixException(env, errno);

}

JNIEXPORT jint JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_flistxattr(JNIEnv* env, jclass clazz,

    jint fd, jlong listAddress, jint size)

{

    size_t res = -1;

    char* list = jlong_to_ptr(listAddress);

    if (my_flistxattr_func == NULL) {

        errno = ENOTSUP;

    } else {

        /* EINTR not documented */

        res = (*my_flistxattr_func)(fd, list, (size_t)size);

    }

    if (res == (size_t)-1)

        throwUnixException(env, errno);

    return (jint)res;

}

JNIEXPORT jlong JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_setmntent0(JNIEnv* env, jclass this, jlong pathAddress,

                                                 jlong modeAddress)

{

    FILE* fp = NULL;

    const char* path = (const char*)jlong_to_ptr(pathAddress);

    const char* mode = (const char*)jlong_to_ptr(modeAddress);

    do {

        fp = setmntent(path, mode);

    } while (fp == NULL && errno == EINTR);

    if (fp == NULL) {

        throwUnixException(env, errno);

    }

    return ptr_to_jlong(fp);

}

JNIEXPORT jint JNICALL

{

    struct mntent ent;

    struct mntent* m;

    FILE* fp = jlong_to_ptr(value);

    jsize len;

    jbyteArray bytes;

    char* name;

    char* dir;

    char* fstype;

    char* options;

    if (m == NULL)

        return -1;

    name = m->mnt_fsname;

    dir = m->mnt_dir;

    fstype = m->mnt_type;

    options = m->mnt_opts;

    len = strlen(name);

    bytes = (*env)->NewByteArray(env, len);

    if (bytes == NULL)

        return -1;

    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)name);

    (*env)->SetObjectField(env, entry, entry_name, bytes);

    len = strlen(dir);

    bytes = (*env)->NewByteArray(env, len);

    if (bytes == NULL)

        return -1;

    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)dir);

    (*env)->SetObjectField(env, entry, entry_dir, bytes);

    len = strlen(fstype);

    bytes = (*env)->NewByteArray(env, len);

    if (bytes == NULL)

        return -1;

    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)fstype);

    (*env)->SetObjectField(env, entry, entry_fstype, bytes);

    len = strlen(options);

    bytes = (*env)->NewByteArray(env, len);

    if (bytes == NULL)

        return -1;

    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)options);

    (*env)->SetObjectField(env, entry, entry_options, bytes);

    return 0;

}

JNIEXPORT void JNICALL

Java_sun_nio_fs_LinuxNativeDispatcher_endmntent(JNIEnv* env, jclass this, jlong stream)

{

    FILE* fp = jlong_to_ptr(stream);

    /* FIXME - man page doesn't explain how errors are returned */

    endmntent(fp);

}