1 /*-------------------------------------------------------------------------
4 * Virtual file descriptor definitions.
7 * Copyright (c) 1994, Regents of the University of California
9 * $Id: fd.h,v 1.5 1996/11/08 06:02:12 momjian Exp $
11 *-------------------------------------------------------------------------
16 * File {Close, Read, Write, Seek, Tell, Sync}
17 * {File Name Open, Allocate, Free} File
19 * These are NOT JUST RENAMINGS OF THE UNIX ROUTINES.
20 * use them for all file activity...
22 * fd = FilePathOpenFile("foo", O_RDONLY);
25 * use AllocateFile if you need a file descriptor in some other context.
26 * it will make sure that there is a file descriptor free
28 * use FreeFile to let the virtual file descriptor package know that
29 * there is now a free fd (when you are done with it)
38 * FileOpen uses the standard UNIX open(2) flags.
44 * FileSeek uses the standard UNIX lseek(2) flags.
52 typedef char *FileName;
56 /* originally in libpq-fs.h */
57 struct pgstat { /* just the fields we need from stat structure */
61 unsigned int st_sizehigh; /* high order bits */
62 /* 2^64 == 1.8 x 10^20 bytes */
64 int st_atime_s; /* just the seconds */
65 int st_mtime_s; /* since SysV and the new BSD both have */
66 int st_ctime_s; /* usec fields.. */
70 * prototypes for functions in fd.c
72 extern void FileInvalidate(File file);
73 extern File FileNameOpenFile(FileName fileName, int fileFlags, int fileMode);
74 extern File PathNameOpenFile(FileName fileName, int fileFlags, int fileMode);
75 extern void FileClose(File file);
76 extern void FileUnlink(File file);
77 extern int FileRead(File file, char *buffer, int amount);
78 extern int FileWrite(File file, char *buffer, int amount);
79 extern long FileSeek(File file, long offset, int whence);
80 extern long FileTell(File file);
81 extern int FileTruncate(File file, int offset);
82 extern int FileSync(File file);
83 extern int FileNameUnlink(char *filename);
84 extern void AllocateFile(void);
85 extern void FreeFile(void);
86 extern void closeAllVfds(void);
87 extern void closeOneVfd(void);
88 extern int pg_fsync(int fd);