--- /dev/null
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBHDFS_HDFS_H
+#define LIBHDFS_HDFS_H
+
+#include <errno.h> /* for EINTERNAL, etc. */
+#include <fcntl.h> /* for O_RDONLY, O_WRONLY */
+#include <stdint.h> /* for uint64_t, etc. */
+#include <time.h> /* for time_t */
+
+/*
+ * Support export of DLL symbols during libhdfs build, and import of DLL symbols
+ * during client application build. A client application may optionally define
+ * symbol LIBHDFS_DLL_IMPORT in its build. This is not strictly required, but
+ * the compiler can produce more efficient code with it.
+ */
+#ifdef WIN32
+ #ifdef LIBHDFS_DLL_EXPORT
+ #define LIBHDFS_EXTERNAL __declspec(dllexport)
+ #elif LIBHDFS_DLL_IMPORT
+ #define LIBHDFS_EXTERNAL __declspec(dllimport)
+ #else
+ #define LIBHDFS_EXTERNAL
+ #endif
+#else
+ #ifdef LIBHDFS_DLL_EXPORT
+ #define LIBHDFS_EXTERNAL __attribute__((visibility("default")))
+ #elif LIBHDFS_DLL_IMPORT
+ #define LIBHDFS_EXTERNAL __attribute__((visibility("default")))
+ #else
+ #define LIBHDFS_EXTERNAL
+ #endif
+#endif
+
+#ifndef O_RDONLY
+#define O_RDONLY 1
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY 2
+#endif
+
+#ifndef EINTERNAL
+#define EINTERNAL 255
+#endif
+
+#define ELASTIC_BYTE_BUFFER_POOL_CLASS \
+ "org/apache/hadoop/io/ElasticByteBufferPool"
+
+/** All APIs set errno to meaningful values */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ /**
+ * Some utility decls used in libhdfs.
+ */
+ struct hdfsBuilder;
+ typedef int32_t tSize; /// size of data for read/write io ops
+ typedef time_t tTime; /// time type in seconds
+ typedef int64_t tOffset;/// offset within the file
+ typedef uint16_t tPort; /// port
+ typedef enum tObjectKind {
+ kObjectKindFile = 'F',
+ kObjectKindDirectory = 'D',
+ } tObjectKind;
+ struct hdfsStreamBuilder;
+
+
+ /**
+ * The C reflection of org.apache.org.hadoop.FileSystem .
+ */
+ struct hdfs_internal;
+ typedef struct hdfs_internal* hdfsFS;
+
+ struct hdfsFile_internal;
+ typedef struct hdfsFile_internal* hdfsFile;
+
+ struct hadoopRzOptions;
+
+ struct hadoopRzBuffer;
+
+ /**
+ * Determine if a file is open for read.
+ *
+ * @param file The HDFS file
+ * @return 1 if the file is open for read; 0 otherwise
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFileIsOpenForRead(hdfsFile file);
+
+ /**
+ * Determine if a file is open for write.
+ *
+ * @param file The HDFS file
+ * @return 1 if the file is open for write; 0 otherwise
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFileIsOpenForWrite(hdfsFile file);
+
+ struct hdfsReadStatistics {
+ uint64_t totalBytesRead;
+ uint64_t totalLocalBytesRead;
+ uint64_t totalShortCircuitBytesRead;
+ uint64_t totalZeroCopyBytesRead;
+ };
+
+ /**
+ * Get read statistics about a file. This is only applicable to files
+ * opened for reading.
+ *
+ * @param file The HDFS file
+ * @param stats (out parameter) on a successful return, the read
+ * statistics. Unchanged otherwise. You must free the
+ * returned statistics with hdfsFileFreeReadStatistics.
+ * @return 0 if the statistics were successfully returned,
+ * -1 otherwise. On a failure, please check errno against
+ * ENOTSUP. webhdfs, LocalFilesystem, and so forth may
+ * not support read statistics.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFileGetReadStatistics(hdfsFile file,
+ struct hdfsReadStatistics **stats);
+
+ /**
+ * @param stats HDFS read statistics for a file.
+ *
+ * @return the number of remote bytes read.
+ */
+ LIBHDFS_EXTERNAL
+ int64_t hdfsReadStatisticsGetRemoteBytesRead(
+ const struct hdfsReadStatistics *stats);
+
+ /**
+ * Clear the read statistics for a file.
+ *
+ * @param file The file to clear the read statistics of.
+ *
+ * @return 0 on success; the error code otherwise.
+ * EINVAL: the file is not open for reading.
+ * ENOTSUP: the file does not support clearing the read
+ * statistics.
+ * Errno will also be set to this code on failure.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFileClearReadStatistics(hdfsFile file);
+
+ /**
+ * Free some HDFS read statistics.
+ *
+ * @param stats The HDFS read statistics to free.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsFileFreeReadStatistics(struct hdfsReadStatistics *stats);
+
+ /**
+ * hdfsConnectAsUser - Connect to a hdfs file system as a specific user
+ * Connect to the hdfs.
+ * @param nn The NameNode. See hdfsBuilderSetNameNode for details.
+ * @param port The port on which the server is listening.
+ * @param user the user name (this is hadoop domain user). Or NULL is equivelant to hhdfsConnect(host, port)
+ * @return Returns a handle to the filesystem or NULL on error.
+ * @deprecated Use hdfsBuilderConnect instead.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFS hdfsConnectAsUser(const char* nn, tPort port, const char *user);
+
+ /**
+ * hdfsConnect - Connect to a hdfs file system.
+ * Connect to the hdfs.
+ * @param nn The NameNode. See hdfsBuilderSetNameNode for details.
+ * @param port The port on which the server is listening.
+ * @return Returns a handle to the filesystem or NULL on error.
+ * @deprecated Use hdfsBuilderConnect instead.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFS hdfsConnect(const char* nn, tPort port);
+
+ /**
+ * hdfsConnect - Connect to an hdfs file system.
+ *
+ * Forces a new instance to be created
+ *
+ * @param nn The NameNode. See hdfsBuilderSetNameNode for details.
+ * @param port The port on which the server is listening.
+ * @param user The user name to use when connecting
+ * @return Returns a handle to the filesystem or NULL on error.
+ * @deprecated Use hdfsBuilderConnect instead.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFS hdfsConnectAsUserNewInstance(const char* nn, tPort port, const char *user );
+
+ /**
+ * hdfsConnect - Connect to an hdfs file system.
+ *
+ * Forces a new instance to be created
+ *
+ * @param nn The NameNode. See hdfsBuilderSetNameNode for details.
+ * @param port The port on which the server is listening.
+ * @return Returns a handle to the filesystem or NULL on error.
+ * @deprecated Use hdfsBuilderConnect instead.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFS hdfsConnectNewInstance(const char* nn, tPort port);
+
+ /**
+ * Connect to HDFS using the parameters defined by the builder.
+ *
+ * The HDFS builder will be freed, whether or not the connection was
+ * successful.
+ *
+ * Every successful call to hdfsBuilderConnect should be matched with a call
+ * to hdfsDisconnect, when the hdfsFS is no longer needed.
+ *
+ * @param bld The HDFS builder
+ * @return Returns a handle to the filesystem, or NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFS hdfsBuilderConnect(struct hdfsBuilder *bld);
+
+ /**
+ * Create an HDFS builder.
+ *
+ * @return The HDFS builder, or NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ struct hdfsBuilder *hdfsNewBuilder(void);
+
+ /**
+ * Force the builder to always create a new instance of the FileSystem,
+ * rather than possibly finding one in the cache.
+ *
+ * @param bld The HDFS builder
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsBuilderSetForceNewInstance(struct hdfsBuilder *bld);
+
+ /**
+ * Set the HDFS NameNode to connect to.
+ *
+ * @param bld The HDFS builder
+ * @param nn The NameNode to use.
+ *
+ * If the string given is 'default', the default NameNode
+ * configuration will be used (from the XML configuration files)
+ *
+ * If NULL is given, a LocalFileSystem will be created.
+ *
+ * If the string starts with a protocol type such as file:// or
+ * hdfs://, this protocol type will be used. If not, the
+ * hdfs:// protocol type will be used.
+ *
+ * You may specify a NameNode port in the usual way by
+ * passing a string of the format hdfs://<hostname>:<port>.
+ * Alternately, you may set the port with
+ * hdfsBuilderSetNameNodePort. However, you must not pass the
+ * port in two different ways.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsBuilderSetNameNode(struct hdfsBuilder *bld, const char *nn);
+
+ /**
+ * Set the port of the HDFS NameNode to connect to.
+ *
+ * @param bld The HDFS builder
+ * @param port The port.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsBuilderSetNameNodePort(struct hdfsBuilder *bld, tPort port);
+
+ /**
+ * Set the username to use when connecting to the HDFS cluster.
+ *
+ * @param bld The HDFS builder
+ * @param userName The user name. The string will be shallow-copied.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsBuilderSetUserName(struct hdfsBuilder *bld, const char *userName);
+
+ /**
+ * Set the path to the Kerberos ticket cache to use when connecting to
+ * the HDFS cluster.
+ *
+ * @param bld The HDFS builder
+ * @param kerbTicketCachePath The Kerberos ticket cache path. The string
+ * will be shallow-copied.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsBuilderSetKerbTicketCachePath(struct hdfsBuilder *bld,
+ const char *kerbTicketCachePath);
+
+ /**
+ * Free an HDFS builder.
+ *
+ * It is normally not necessary to call this function since
+ * hdfsBuilderConnect frees the builder.
+ *
+ * @param bld The HDFS builder
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsFreeBuilder(struct hdfsBuilder *bld);
+
+ /**
+ * Set a configuration string for an HdfsBuilder.
+ *
+ * @param key The key to set.
+ * @param val The value, or NULL to set no value.
+ * This will be shallow-copied. You are responsible for
+ * ensuring that it remains valid until the builder is
+ * freed.
+ *
+ * @return 0 on success; nonzero error code otherwise.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsBuilderConfSetStr(struct hdfsBuilder *bld, const char *key,
+ const char *val);
+
+ /**
+ * Get a configuration string.
+ *
+ * @param key The key to find
+ * @param val (out param) The value. This will be set to NULL if the
+ * key isn't found. You must free this string with
+ * hdfsConfStrFree.
+ *
+ * @return 0 on success; nonzero error code otherwise.
+ * Failure to find the key is not an error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsConfGetStr(const char *key, char **val);
+
+ /**
+ * Get a configuration integer.
+ *
+ * @param key The key to find
+ * @param val (out param) The value. This will NOT be changed if the
+ * key isn't found.
+ *
+ * @return 0 on success; nonzero error code otherwise.
+ * Failure to find the key is not an error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsConfGetInt(const char *key, int32_t *val);
+
+ /**
+ * Free a configuration string found with hdfsConfGetStr.
+ *
+ * @param val A configuration string obtained from hdfsConfGetStr
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsConfStrFree(char *val);
+
+ /**
+ * hdfsDisconnect - Disconnect from the hdfs file system.
+ * Disconnect from hdfs.
+ * @param fs The configured filesystem handle.
+ * @return Returns 0 on success, -1 on error.
+ * Even if there is an error, the resources associated with the
+ * hdfsFS will be freed.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsDisconnect(hdfsFS fs);
+
+ /**
+ * hdfsOpenFile - Open a hdfs file in given mode.
+ * @deprecated Use the hdfsStreamBuilder functions instead.
+ * This function does not support setting block sizes bigger than 2 GB.
+ *
+ * @param fs The configured filesystem handle.
+ * @param path The full path to the file.
+ * @param flags - an | of bits/fcntl.h file flags - supported flags are O_RDONLY, O_WRONLY (meaning create or overwrite i.e., implies O_TRUNCAT),
+ * O_WRONLY|O_APPEND. Other flags are generally ignored other than (O_RDWR || (O_EXCL & O_CREAT)) which return NULL and set errno equal ENOTSUP.
+ * @param bufferSize Size of buffer for read/write - pass 0 if you want
+ * to use the default configured values.
+ * @param replication Block replication - pass 0 if you want to use
+ * the default configured values.
+ * @param blocksize Size of block - pass 0 if you want to use the
+ * default configured values. Note that if you want a block size bigger
+ * than 2 GB, you must use the hdfsStreamBuilder API rather than this
+ * deprecated function.
+ * @return Returns the handle to the open file or NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
+ int bufferSize, short replication, tSize blocksize);
+
+ /**
+ * hdfsStreamBuilderAlloc - Allocate an HDFS stream builder.
+ *
+ * @param fs The configured filesystem handle.
+ * @param path The full path to the file. Will be deep-copied.
+ * @param flags The open flags, as in hdfsOpenFile.
+ * @return Returns the hdfsStreamBuilder, or NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ struct hdfsStreamBuilder *hdfsStreamBuilderAlloc(hdfsFS fs,
+ const char *path, int flags);
+
+ /**
+ * hdfsStreamBuilderFree - Free an HDFS file builder.
+ *
+ * It is normally not necessary to call this function since
+ * hdfsStreamBuilderBuild frees the builder.
+ *
+ * @param bld The hdfsStreamBuilder to free.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsStreamBuilderFree(struct hdfsStreamBuilder *bld);
+
+ /**
+ * hdfsStreamBuilderSetBufferSize - Set the stream buffer size.
+ *
+ * @param bld The hdfs stream builder.
+ * @param bufferSize The buffer size to set.
+ *
+ * @return 0 on success, or -1 on error. Errno will be set on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsStreamBuilderSetBufferSize(struct hdfsStreamBuilder *bld,
+ int32_t bufferSize);
+
+ /**
+ * hdfsStreamBuilderSetReplication - Set the replication for the stream.
+ * This is only relevant for output streams, which will create new blocks.
+ *
+ * @param bld The hdfs stream builder.
+ * @param replication The replication to set.
+ *
+ * @return 0 on success, or -1 on error. Errno will be set on error.
+ * If you call this on an input stream builder, you will get
+ * EINVAL, because this configuration is not relevant to input
+ * streams.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsStreamBuilderSetReplication(struct hdfsStreamBuilder *bld,
+ int16_t replication);
+
+ /**
+ * hdfsStreamBuilderSetDefaultBlockSize - Set the default block size for
+ * the stream. This is only relevant for output streams, which will create
+ * new blocks.
+ *
+ * @param bld The hdfs stream builder.
+ * @param defaultBlockSize The default block size to set.
+ *
+ * @return 0 on success, or -1 on error. Errno will be set on error.
+ * If you call this on an input stream builder, you will get
+ * EINVAL, because this configuration is not relevant to input
+ * streams.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsStreamBuilderSetDefaultBlockSize(struct hdfsStreamBuilder *bld,
+ int64_t defaultBlockSize);
+
+ /**
+ * hdfsStreamBuilderBuild - Build the stream by calling open or create.
+ *
+ * @param bld The hdfs stream builder. This pointer will be freed, whether
+ * or not the open succeeds.
+ *
+ * @return the stream pointer on success, or NULL on error. Errno will be
+ * set on error.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFile hdfsStreamBuilderBuild(struct hdfsStreamBuilder *bld);
+
+ /**
+ * hdfsTruncateFile - Truncate a hdfs file to given lenght.
+ * @param fs The configured filesystem handle.
+ * @param path The full path to the file.
+ * @param newlength The size the file is to be truncated to
+ * @return 1 if the file has been truncated to the desired newlength
+ * and is immediately available to be reused for write operations
+ * such as append.
+ * 0 if a background process of adjusting the length of the last
+ * block has been started, and clients should wait for it to
+ * complete before proceeding with further file updates.
+ * -1 on error.
+ */
+ int hdfsTruncateFile(hdfsFS fs, const char* path, tOffset newlength);
+
+ /**
+ * hdfsUnbufferFile - Reduce the buffering done on a file.
+ *
+ * @param file The file to unbuffer.
+ * @return 0 on success
+ * ENOTSUP if the file does not support unbuffering
+ * Errno will also be set to this value.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsUnbufferFile(hdfsFile file);
+
+ /**
+ * hdfsCloseFile - Close an open file.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @return Returns 0 on success, -1 on error.
+ * On error, errno will be set appropriately.
+ * If the hdfs file was valid, the memory associated with it will
+ * be freed at the end of this call, even if there was an I/O
+ * error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsCloseFile(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsExists - Checks if a given path exsits on the filesystem
+ * @param fs The configured filesystem handle.
+ * @param path The path to look for
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsExists(hdfsFS fs, const char *path);
+
+
+ /**
+ * hdfsSeek - Seek to given offset in file.
+ * This works only for files opened in read-only mode.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @param desiredPos Offset into the file to seek into.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsSeek(hdfsFS fs, hdfsFile file, tOffset desiredPos);
+
+
+ /**
+ * hdfsTell - Get the current offset in the file, in bytes.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @return Current offset, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tOffset hdfsTell(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsRead - Read data from an open file.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @param buffer The buffer to copy read bytes into.
+ * @param length The length of the buffer.
+ * @return On success, a positive number indicating how many bytes
+ * were read.
+ * On end-of-file, 0.
+ * On error, -1. Errno will be set to the error code.
+ * Just like the POSIX read function, hdfsRead will return -1
+ * and set errno to EINTR if data is temporarily unavailable,
+ * but we are not yet at the end of the file.
+ */
+ LIBHDFS_EXTERNAL
+ tSize hdfsRead(hdfsFS fs, hdfsFile file, void* buffer, tSize length);
+
+ /**
+ * hdfsPread - Positional read of data from an open file.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @param position Position from which to read
+ * @param buffer The buffer to copy read bytes into.
+ * @param length The length of the buffer.
+ * @return See hdfsRead
+ */
+ LIBHDFS_EXTERNAL
+ tSize hdfsPread(hdfsFS fs, hdfsFile file, tOffset position,
+ void* buffer, tSize length);
+
+
+ /**
+ * hdfsWrite - Write data into an open file.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @param buffer The data.
+ * @param length The no. of bytes to write.
+ * @return Returns the number of bytes written, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tSize hdfsWrite(hdfsFS fs, hdfsFile file, const void* buffer,
+ tSize length);
+
+
+ /**
+ * hdfsWrite - Flush the data.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFlush(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsHFlush - Flush out the data in client's user buffer. After the
+ * return of this call, new readers will see the data.
+ * @param fs configured filesystem handle
+ * @param file file handle
+ * @return 0 on success, -1 on error and sets errno
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsHFlush(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsHSync - Similar to posix fsync, Flush out the data in client's
+ * user buffer. all the way to the disk device (but the disk may have
+ * it in its cache).
+ * @param fs configured filesystem handle
+ * @param file file handle
+ * @return 0 on success, -1 on error and sets errno
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsHSync(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsAvailable - Number of bytes that can be read from this
+ * input stream without blocking.
+ * @param fs The configured filesystem handle.
+ * @param file The file handle.
+ * @return Returns available bytes; -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsAvailable(hdfsFS fs, hdfsFile file);
+
+
+ /**
+ * hdfsCopy - Copy file from one filesystem to another.
+ * @param srcFS The handle to source filesystem.
+ * @param src The path of source file.
+ * @param dstFS The handle to destination filesystem.
+ * @param dst The path of destination file.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsCopy(hdfsFS srcFS, const char* src, hdfsFS dstFS, const char* dst);
+
+
+ /**
+ * hdfsMove - Move file from one filesystem to another.
+ * @param srcFS The handle to source filesystem.
+ * @param src The path of source file.
+ * @param dstFS The handle to destination filesystem.
+ * @param dst The path of destination file.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsMove(hdfsFS srcFS, const char* src, hdfsFS dstFS, const char* dst);
+
+
+ /**
+ * hdfsDelete - Delete file.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the file.
+ * @param recursive if path is a directory and set to
+ * non-zero, the directory is deleted else throws an exception. In
+ * case of a file the recursive argument is irrelevant.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsDelete(hdfsFS fs, const char* path, int recursive);
+
+ /**
+ * hdfsRename - Rename file.
+ * @param fs The configured filesystem handle.
+ * @param oldPath The path of the source file.
+ * @param newPath The path of the destination file.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsRename(hdfsFS fs, const char* oldPath, const char* newPath);
+
+
+ /**
+ * hdfsGetWorkingDirectory - Get the current working directory for
+ * the given filesystem.
+ * @param fs The configured filesystem handle.
+ * @param buffer The user-buffer to copy path of cwd into.
+ * @param bufferSize The length of user-buffer.
+ * @return Returns buffer, NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ char* hdfsGetWorkingDirectory(hdfsFS fs, char *buffer, size_t bufferSize);
+
+
+ /**
+ * hdfsSetWorkingDirectory - Set the working directory. All relative
+ * paths will be resolved relative to it.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the new 'cwd'.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsSetWorkingDirectory(hdfsFS fs, const char* path);
+
+
+ /**
+ * hdfsCreateDirectory - Make the given file and all non-existent
+ * parents into directories.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the directory.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsCreateDirectory(hdfsFS fs, const char* path);
+
+
+ /**
+ * hdfsSetReplication - Set the replication of the specified
+ * file to the supplied value
+ * @param fs The configured filesystem handle.
+ * @param path The path of the file.
+ * @return Returns 0 on success, -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsSetReplication(hdfsFS fs, const char* path, int16_t replication);
+
+
+ /**
+ * hdfsFileInfo - Information about a file/directory.
+ */
+ typedef struct {
+ tObjectKind mKind; /* file or directory */
+ char *mName; /* the name of the file */
+ tTime mLastMod; /* the last modification time for the file in seconds */
+ tOffset mSize; /* the size of the file in bytes */
+ short mReplication; /* the count of replicas */
+ tOffset mBlockSize; /* the block size for the file */
+ char *mOwner; /* the owner of the file */
+ char *mGroup; /* the group associated with the file */
+ short mPermissions; /* the permissions associated with the file */
+ tTime mLastAccess; /* the last access time for the file in seconds */
+ } hdfsFileInfo;
+
+
+ /**
+ * hdfsListDirectory - Get list of files/directories for a given
+ * directory-path. hdfsFreeFileInfo should be called to deallocate memory.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the directory.
+ * @param numEntries Set to the number of files/directories in path.
+ * @return Returns a dynamically-allocated array of hdfsFileInfo
+ * objects; NULL on error or empty directory.
+ * errno is set to non-zero on error or zero on success.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFileInfo *hdfsListDirectory(hdfsFS fs, const char* path,
+ int *numEntries);
+
+
+ /**
+ * hdfsGetPathInfo - Get information about a path as a (dynamically
+ * allocated) single hdfsFileInfo struct. hdfsFreeFileInfo should be
+ * called when the pointer is no longer needed.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the file.
+ * @return Returns a dynamically-allocated hdfsFileInfo object;
+ * NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ hdfsFileInfo *hdfsGetPathInfo(hdfsFS fs, const char* path);
+
+
+ /**
+ * hdfsFreeFileInfo - Free up the hdfsFileInfo array (including fields)
+ * @param hdfsFileInfo The array of dynamically-allocated hdfsFileInfo
+ * objects.
+ * @param numEntries The size of the array.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsFreeFileInfo(hdfsFileInfo *hdfsFileInfo, int numEntries);
+
+ /**
+ * hdfsFileIsEncrypted: determine if a file is encrypted based on its
+ * hdfsFileInfo.
+ * @return -1 if there was an error (errno will be set), 0 if the file is
+ * not encrypted, 1 if the file is encrypted.
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsFileIsEncrypted(hdfsFileInfo *hdfsFileInfo);
+
+
+ /**
+ * hdfsGetHosts - Get hostnames where a particular block (determined by
+ * pos & blocksize) of a file is stored. The last element in the array
+ * is NULL. Due to replication, a single block could be present on
+ * multiple hosts.
+ * @param fs The configured filesystem handle.
+ * @param path The path of the file.
+ * @param start The start of the block.
+ * @param length The length of the block.
+ * @return Returns a dynamically-allocated 2-d array of blocks-hosts;
+ * NULL on error.
+ */
+ LIBHDFS_EXTERNAL
+ char*** hdfsGetHosts(hdfsFS fs, const char* path,
+ tOffset start, tOffset length);
+
+
+ /**
+ * hdfsFreeHosts - Free up the structure returned by hdfsGetHosts
+ * @param hdfsFileInfo The array of dynamically-allocated hdfsFileInfo
+ * objects.
+ * @param numEntries The size of the array.
+ */
+ LIBHDFS_EXTERNAL
+ void hdfsFreeHosts(char ***blockHosts);
+
+
+ /**
+ * hdfsGetDefaultBlockSize - Get the default blocksize.
+ *
+ * @param fs The configured filesystem handle.
+ * @deprecated Use hdfsGetDefaultBlockSizeAtPath instead.
+ *
+ * @return Returns the default blocksize, or -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tOffset hdfsGetDefaultBlockSize(hdfsFS fs);
+
+
+ /**
+ * hdfsGetDefaultBlockSizeAtPath - Get the default blocksize at the
+ * filesystem indicated by a given path.
+ *
+ * @param fs The configured filesystem handle.
+ * @param path The given path will be used to locate the actual
+ * filesystem. The full path does not have to exist.
+ *
+ * @return Returns the default blocksize, or -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tOffset hdfsGetDefaultBlockSizeAtPath(hdfsFS fs, const char *path);
+
+
+ /**
+ * hdfsGetCapacity - Return the raw capacity of the filesystem.
+ * @param fs The configured filesystem handle.
+ * @return Returns the raw-capacity; -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tOffset hdfsGetCapacity(hdfsFS fs);
+
+
+ /**
+ * hdfsGetUsed - Return the total raw size of all files in the filesystem.
+ * @param fs The configured filesystem handle.
+ * @return Returns the total-size; -1 on error.
+ */
+ LIBHDFS_EXTERNAL
+ tOffset hdfsGetUsed(hdfsFS fs);
+
+ /**
+ * Change the user and/or group of a file or directory.
+ *
+ * @param fs The configured filesystem handle.
+ * @param path the path to the file or directory
+ * @param owner User string. Set to NULL for 'no change'
+ * @param group Group string. Set to NULL for 'no change'
+ * @return 0 on success else -1
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsChown(hdfsFS fs, const char* path, const char *owner,
+ const char *group);
+
+ /**
+ * hdfsChmod
+ * @param fs The configured filesystem handle.
+ * @param path the path to the file or directory
+ * @param mode the bitmask to set it to
+ * @return 0 on success else -1
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsChmod(hdfsFS fs, const char* path, short mode);
+
+ /**
+ * hdfsUtime
+ * @param fs The configured filesystem handle.
+ * @param path the path to the file or directory
+ * @param mtime new modification time or -1 for no change
+ * @param atime new access time or -1 for no change
+ * @return 0 on success else -1
+ */
+ LIBHDFS_EXTERNAL
+ int hdfsUtime(hdfsFS fs, const char* path, tTime mtime, tTime atime);
+
+ /**
+ * Allocate a zero-copy options structure.
+ *
+ * You must free all options structures allocated with this function using
+ * hadoopRzOptionsFree.
+ *
+ * @return A zero-copy options structure, or NULL if one could
+ * not be allocated. If NULL is returned, errno will
+ * contain the error number.
+ */
+ LIBHDFS_EXTERNAL
+ struct hadoopRzOptions *hadoopRzOptionsAlloc(void);
+
+ /**
+ * Determine whether we should skip checksums in read0.
+ *
+ * @param opts The options structure.
+ * @param skip Nonzero to skip checksums sometimes; zero to always
+ * check them.
+ *
+ * @return 0 on success; -1 plus errno on failure.
+ */
+ LIBHDFS_EXTERNAL
+ int hadoopRzOptionsSetSkipChecksum(
+ struct hadoopRzOptions *opts, int skip);
+
+ /**
+ * Set the ByteBufferPool to use with read0.
+ *
+ * @param opts The options structure.
+ * @param className If this is NULL, we will not use any
+ * ByteBufferPool. If this is non-NULL, it will be
+ * treated as the name of the pool class to use.
+ * For example, you can use
+ * ELASTIC_BYTE_BUFFER_POOL_CLASS.
+ *
+ * @return 0 if the ByteBufferPool class was found and
+ * instantiated;
+ * -1 plus errno otherwise.
+ */
+ LIBHDFS_EXTERNAL
+ int hadoopRzOptionsSetByteBufferPool(
+ struct hadoopRzOptions *opts, const char *className);
+
+ /**
+ * Free a hadoopRzOptionsFree structure.
+ *
+ * @param opts The options structure to free.
+ * Any associated ByteBufferPool will also be freed.
+ */
+ LIBHDFS_EXTERNAL
+ void hadoopRzOptionsFree(struct hadoopRzOptions *opts);
+
+ /**
+ * Perform a byte buffer read.
+ * If possible, this will be a zero-copy (mmap) read.
+ *
+ * @param file The file to read from.
+ * @param opts An options structure created by hadoopRzOptionsAlloc.
+ * @param maxLength The maximum length to read. We may read fewer bytes
+ * than this length.
+ *
+ * @return On success, we will return a new hadoopRzBuffer.
+ * This buffer will continue to be valid and readable
+ * until it is released by readZeroBufferFree. Failure to
+ * release a buffer will lead to a memory leak.
+ * You can access the data within the hadoopRzBuffer with
+ * hadoopRzBufferGet. If you have reached EOF, the data
+ * within the hadoopRzBuffer will be NULL. You must still
+ * free hadoopRzBuffer instances containing NULL.
+ *
+ * On failure, we will return NULL plus an errno code.
+ * errno = EOPNOTSUPP indicates that we could not do a
+ * zero-copy read, and there was no ByteBufferPool
+ * supplied.
+ */
+ LIBHDFS_EXTERNAL
+ struct hadoopRzBuffer* hadoopReadZero(hdfsFile file,
+ struct hadoopRzOptions *opts, int32_t maxLength);
+
+ /**
+ * Determine the length of the buffer returned from readZero.
+ *
+ * @param buffer a buffer returned from readZero.
+ * @return the length of the buffer.
+ */
+ LIBHDFS_EXTERNAL
+ int32_t hadoopRzBufferLength(const struct hadoopRzBuffer *buffer);
+
+ /**
+ * Get a pointer to the raw buffer returned from readZero.
+ *
+ * To find out how many bytes this buffer contains, call
+ * hadoopRzBufferLength.
+ *
+ * @param buffer a buffer returned from readZero.
+ * @return a pointer to the start of the buffer. This will be
+ * NULL when end-of-file has been reached.
+ */
+ LIBHDFS_EXTERNAL
+ const void *hadoopRzBufferGet(const struct hadoopRzBuffer *buffer);
+
+ /**
+ * Release a buffer obtained through readZero.
+ *
+ * @param file The hdfs stream that created this buffer. This must be
+ * the same stream you called hadoopReadZero on.
+ * @param buffer The buffer to release.
+ */
+ LIBHDFS_EXTERNAL
+ void hadoopRzBufferFree(hdfsFile file, struct hadoopRzBuffer *buffer);
+
+#ifdef __cplusplus
+}
+#endif
+
+#undef LIBHDFS_EXTERNAL
+#endif /*LIBHDFS_HDFS_H*/
+
+/**
+ * vim: ts=4: sw=4: et
+ */
projects / ceph.git / blobdiff