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104 lines
3.0 KiB
104 lines
3.0 KiB
Gary,
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Here's some excerpts from the standard and the specifics for each relevant
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POSIX function. I put astericks next to statements that are of importance
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for the implementation. The situation is better than I had thought due to
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the possibility of delaying file times updates.
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-----------------------------------------------------
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POSIX Requirements for File Times Updates
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Each file has 3 time values that are updated when
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1. atime - file data has been accessed (i.e. read)
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2. mtime - file data has been modified (i.e. write)
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3. ctime - file status has been changed (i.e. chmod)
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For each of the functions listed below, the appropriate time-related
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fields are noted as "marked for update".
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**** An implementation may update fields that are marked for update
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immediately, or may update such fields periodically.****
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When the fields are updated, they are set to the current time and the
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update marks are cleared. All files that are marked for update shall
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be updated when the file is no longer open by any process,
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or when a stat or fstat (NtQueryInformationFile) is done. Other times
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at which updates are done are unspecified.
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**** Updates are not done for files on read-only file systems. ****
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By function:
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DONE
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readdir -
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atime of DIRECTORY updated each time is actually read.
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NtQueryDirectoryFile for FileNamesInformation
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open -
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If O_CREAT and file didn't previously exist, update atime, ctime,
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and mtime of FILE and PARENT DIRECTORY.
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NtCreateFile -
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DesiredAccess=SYNCHRONIZE|READ_CONTROL|FILE_READ_ATTRIBUTES|FILE_READ_EA
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or'ed with FILE_READ_DATA, FILE_WRITE_DATA, or both, or
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FILE_APPEND_DATA.
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ShareAccess = FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE
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FileAttributes = FILE_ATTRIBUTE_NORMAL.
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If O_TRUNC and file did exist, update ctime and mtime of FILE.
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NtOpenFile with access same as above.
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creat - Same as open with O_CREAT and O_TRUNC.
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mkdir - Update atime, ctime, and mtime of DIRECTORY; update ctime and
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mtime of PARENT DIRECTORY.
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NtCreateFile -
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DesiredAccess = 0L; ShareAccess = 0L.
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FileAttributes = FILE_ATTRIBUTE_NORMAL.
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mkfifo - Update atime, ctime, mtime of FILE. Update ctime, mtime of PARENT
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DIRECTORY.
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NtCreateFile -
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DesiredAccess = FILE_READ_DATA; ShareAccess = 0L.
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FileAttributes = FILE_ATTRIBUTE_SYSTEM.
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pipe - atime, ctime, and mtime of pipe
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Done in psx subsystem now - may take explicit setting of times.
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-------------------------------------
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TO BE DONE (should be complete before December 15 - I will update at that time)
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link - Update ctime of FILE, ctime and mtime of PARENT DIRECTORY containing
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new entry.
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NtSetInformationFile
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unlink - Update ctime of FILE unless link count goes to 0, ctime and mtime
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of PARENT DIRECTORY.
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NtSetInformationFile
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rmdir - ctime and mtime of PARENT DIRECTORY.
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NtSetInformationFile
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rename - Update ctime and mtime of PARENT DIRECTORY of each file.
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NtSetInformationFile
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chmod - ctime of FILE.
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NtSetInformationFile
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chown - ctime of FILE.
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NtSetInformationFile
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utime - ctime of FILE
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NtSetInformationFile
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read - atime of FILE
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NtReadFile
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write - ctime and mtime of FILE.
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NtWriteFile
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