Open System Services Library Calls Reference Manual (G06.27+, H06.04+)

rewinddir(3) OSS Library Calls Ref
erence Manual
If, after a call to a fork() or tdm_fork() function, both the parent and child processes make calls
to the rewinddir() function and the readdir() function to access an OSS directory, the results
are undefined.
Use on Guardian Objects
• Only disks appear as entries in the /G directory. A call to rewinddir() rewinds the list of
disks to the beginning. A call to rewinddir() on a specific disk rewinds the list of its
subvolumes to the beginning.
RETURN VALUES
The rewinddir( ) function does not return a value. If rewinddir( ) detects a problem, it sets
errno. For correct processing of errors, set errno to the value 0 (zero) before each rewinddir()
function call and test the value of errno after each call.
ERRORS
If any of the following conditions occur, the rewinddir() function sets errno to the correspond-
ing value:
[EBADF] The dir_pointer parameter does not refer to an open directory stream. This error
is returned instead of [EFAULT] if the process has copied and altered the struc-
ture pointed to by the dir_pointer parameter after the system has freed the buffer
that contains the structure.
[EFAULT] The dir_pointer parameter does not point to a valid directory structure open for
reading.
RELATED INFORMATION
Functions: closedir(3), mkdir(2), opendir(3), readdir(3), rmdir(2), seekdir(3), telldir(3).
STANDARDS CONFORMANCE
The POSIX standards leave some features to the implementing vendor to define. The following
features are affected in the HP implementation:
• If files are removed from a directory after the most recent call to the opendir() or
rewinddir( ) function but prior to the first call to the readdir() function, the readdir()
function does not return entries for these files. If files are added to a directory after the
most recent call to the opendir() or rewinddir() function but prior to the first call to the
readdir() function, the readdir() function returns entries for these files.
• The ramifications of buffering more than one directory entry per read operation are
defined.
• After a call to one of the exec set of functions, all open directory streams are closed
automatically.
• The ramifications of having both the parent and child processes access the same OSS
directory after a call to the fork() or tdm_fork() function are undefined.
• The consequences of calling directory functions with a dir_pointer parameter that does
not refer to a currently opened directory stream are defined. (The error value [EBADF]
or [EFAULT] is returned or a SIGSEGV or SIGILL signal is returned.)
• The error value [EBADF] or [EFAULT] can be returned by the rewinddir() function.
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