file_utils.h

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/*-------------------------------------------------------------------------
 *
 * Assorted utility functions to work on files.
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/common/file_utils.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef FILE_UTILS_H
#define FILE_UTILS_H
 
#include <dirent.h>
 
typedef enum PGFileType
{
    PGFILETYPE_ERROR,
    PGFILETYPE_UNKNOWN,
    PGFILETYPE_REG,
    PGFILETYPE_DIR,
    PGFILETYPE_LNK,
} PGFileType;
 
typedef enum DataDirSyncMethod
{
    DATA_DIR_SYNC_METHOD_FSYNC,
    DATA_DIR_SYNC_METHOD_SYNCFS,
} DataDirSyncMethod;
 
struct iovec;                   /* avoid including port/pg_iovec.h here */
 
#ifdef FRONTEND
extern int  fsync_fname(const char *fname, bool isdir);
extern void sync_pgdata(const char *pg_data, int serverVersion,
                        DataDirSyncMethod sync_method);
extern void sync_dir_recurse(const char *dir, DataDirSyncMethod sync_method);
extern int  durable_rename(const char *oldfile, const char *newfile);
extern int  fsync_parent_path(const char *fname);
#endif
 
extern PGFileType get_dirent_type(const char *path,
                                  const struct dirent *de,
                                  bool look_through_symlinks,
                                  int elevel);
 
extern int  compute_remaining_iovec(struct iovec *destination,
                                    const struct iovec *source,
                                    int iovcnt,
                                    size_t transferred);
 
extern ssize_t pg_pwritev_with_retry(int fd,
                                     const struct iovec *iov,
                                     int iovcnt,
                                     off_t offset);
 
extern ssize_t pg_pwrite_zeros(int fd, size_t size, off_t offset);
 
/* Filename components */
#define PG_TEMP_FILES_DIR "pgsql_tmp"
#define PG_TEMP_FILE_PREFIX "pgsql_tmp"
 
#endif                          /* FILE_UTILS_H */