JNIEXPORT jlong JNICALL
Java_java_lang_ProcessImpl_openForAtomicAppend(JNIEnv *env, jclass ignored, jstring path)
{
const DWORD access = (FILE_GENERIC_WRITE & ~FILE_WRITE_DATA);
const DWORD sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
const DWORD disposition = OPEN_ALWAYS;
const DWORD flagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
HANDLE h;
WCHAR *pathbuf = pathToNTPath(env, path, JNI_FALSE);
if (pathbuf == NULL) {
/* Exception already pending */
return -1;
}
h = CreateFileW(
pathbuf, /* Wide char path name */
access, /* Read and/or write permission */
sharing, /* File sharing flags */
NULL, /* Security attributes */
disposition, /* creation disposition */
flagsAndAttributes, /* flags and attributes */
NULL);
free(pathbuf);
if (h == INVALID_HANDLE_VALUE) {
JNU_ThrowIOExceptionWithLastError(env, "CreateFileW");
}
return ptr_to_jlong(h);
}
/* If this returns NULL then an exception is pending */
WCHAR*
fileToNTPath(JNIEnv *env, jobject file, jfieldID id) {
jstring path = NULL;
if (file != NULL) {
path = (*env)->GetObjectField(env, file, id);
}
return pathToNTPath(env, path, JNI_FALSE);
}
