/*

 * 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

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

 *

 * 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.

 *

 */

/*

 * Solaris/Linux platform specific code to support the Prefs API.

 */

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <utime.h>

#include "jni_util.h"

JNIEXPORT jint JNICALL

Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env,

                       jclass thisclass, jstring java_fname, jint permission) {

    const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);

    int result;

    result =  chmod(fname, permission);

    if (result != 0)

       result = errno;

    JNU_ReleaseStringPlatformChars(env, java_fname, fname);

    return (jint) result;

}

typedef struct flock64 FLOCK;

/**

 * Try to open a named lock file.

 * The result is a cookie that can be used later to unlock the file.

 * On failure the result is zero.

 */

JNIEXPORT jintArray JNICALL

Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env,

    jclass thisclass, jstring java_fname, jint permission, jboolean shared) {

    const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);

    int fd, rc;

    int result[2];

    jintArray javaResult;

    int old_umask;

    FLOCK fl;

    fl.l_whence = SEEK_SET;

    fl.l_len = 0;

    fl.l_start = 0;

    if (shared == JNI_TRUE) {

        fl.l_type = F_RDLCK;

    } else {

        fl.l_type = F_WRLCK;

    }

    if (shared == JNI_TRUE) {

        fd = open(fname, O_RDONLY, 0);

    } else {

        old_umask = umask(0);

        fd = open(fname, O_WRONLY|O_CREAT, permission);

        result[1] = errno;

        umask(old_umask);

    }

    if (fd < 0) {

        result[0] = 0;

    } else {

        rc = fcntl(fd, F_SETLK64, &fl);

        result[1] = errno;

        if (rc < 0) {

            result[0]= 0;

            close(fd);

        } else {

          result[0] = fd;

        }

    }

    JNU_ReleaseStringPlatformChars(env, java_fname, fname);

    javaResult = (*env)->NewIntArray(env,2);

    (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result);

    return javaResult;

}

/**

 * Try to unlock a lock file, using a cookie returned by lockFile.

 */

JNIEXPORT jint JNICALL

Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env,

                                      jclass thisclass, jint fd) {

    int rc;

    FLOCK fl;

    fl.l_whence = SEEK_SET;

    fl.l_len = 0;

    fl.l_start = 0;

    fl.l_type = F_UNLCK;

    rc = fcntl(fd, F_SETLK64, &fl);

    if (rc < 0) {

        close(fd);

        return (jint)errno;

    }

    rc = close(fd);

    if (rc < 0) {

        return (jint) errno;

    }

    return 0;

}