On Fri, 10 Aug 2007, S h i v wrote:
> Hi,
>
> A linux app that I want to build on SX using sunpro uses "struct
> dirent" that has non-standard gcc extensions (ex: d_type) that are not
> available in sunpro.
Not gcc extensions. Linux and/or BSD specifics.
The standard for dirent.h is quite clear - see dirent(3HEAD) manpage:
The internal format of directories is unspecified. The
<dirent.h> header defines the following type:
DIR A type representing a directory stream.
The header also defines the structure dirent, which includes
the following members:
ino_t d_ino /* file serial number */
char d_name[] /* name of entry */
You cannot rely on the presence of any other members but these two, if you
want to write portable code.
> I wrote a test program using stat and mask mode S_IFMT as defined
> sys/stat.h to get a substitute(snippet below), but the output does not
> recognize symlinks. Why so?
Because you're using stat() where you should be using lstat(). Again, see
stat(2) manpage:
The lstat() function obtains file attributes similar to
stat(), except when the named file is a symbolic link; in
that case lstat() returns information about the link, while
stat() returns information about the file the link refer-
ences.
I.e. if you want to see the symlink, aka S_IFLNK in st_mode, you need to
call lstat() not stat(). The latter resolves the symlink.
Best regards,
FrankH.
>
> Code snippet
> -----------------------
> /* Loop through directory entries. */
> while ((dp = readdir(dir)) != NULL) {
> /* Get file type information. */
> if (stat(dp->d_name, &statbuf) == -1)
> continue;
> filetypeInformation = statbuf.st_mode & S_IFMT ;
> printf("TYPE = %x %20s ",filetypeInformation, dp->d_name);
> switch(filetypeInformation)
> {
> case S_IFREG : printf("Regular file. ");
> break;
> case S_IFDIR : printf("Directory. ");
> break;
> case S_IFLNK : printf("Symbolic link. ");
> break;
> case default : printf("I do not care about
> block/chr/fifo/socket. "); break;
> }
> printf("\n");
> }
>
> Output
> ------------------
> bash-3.00$ ./a.out
> TYPE = 4000 . Directory.
> TYPE = 4000 .. Directory.
> TYPE = 8000 hi.softlink Regular file.
> TYPE = 8000 a.out Regular file.
> TYPE = 8000 hi Regular file.
> TYPE = 8000 filetype.c Regular file.
> TYPE = 8000 hi.hardlink Regular file.
> TYPE = 8000 filetype2.c Regular file.
>
> hi.hardlink and hi.softlink are links to hi, but they are shown as Regular
> file.
>
> regards
> Shiv
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>
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