rh2y+@andrew.cmu.edu (Russell E. Hoffman, II) (12/16/90)
I am writing a utility program in C, and part of it requires grabbing the directory stuff for a particular file (i.e. the size of the file, date of creation, etc.) I am presently using the opendir() and readdir() routines to read in the filenames, and then i do an open() on an individual file to get a path to it, then a _gs_gfd() to get its file descriptor. This works fine, unless the particular file happens to itself be a directory. In this case, _gs_gfd() returns -1, an error. How can I tell if a file is a directory or not? I was hoping that _gs_gfd() would be of use, by reading the file descriptor and then getting its attribute byte, but obviously this is not going to work. Any hints? Thanks in advance, Russell Hoffman rh2y+@andrew.cmu.edu Carnegie Mellon University
blarson@blars (12/17/90)
In article <0bOkkiu00WB6QLT0M4@andrew.cmu.edu> rh2y+@andrew.cmu.edu (Russell E. Hoffman, II) writes: >I am writing a utility program in C, and part of it requires grabbing >the directory stuff for a particular file (i.e. the size of the file, >date of creation, etc.) > >I am presently using the opendir() and readdir() routines to read in the >filenames, and then i do an open() on an individual file to get a path >to it, then a _gs_gfd() to get its file descriptor. This works fine, >unless the particular file happens to itself be a directory. When the open(file, 0) fails, do an open(file, S_IFDIR) . Then do the _gs_gfd() as normal. Alternatibly, if you run by the superuser (or your program is setuid superuser) you could open the raw disk and read the file descriptor directly. This would be less overhead, but very os9 specific. -- blarson@usc.edu C news and rn for os9/68k! -- Bob Larson (blars) blarson@usc.edu usc!blarson Hiding differences does not make them go away. Accepting differences makes them unimportant.
pete@wlbr.imsd.contel.com (Pete Lyall) (12/18/90)
When you open the files that are directories, a conventional OPEN
for read should fail. After it fails, attempt to open it with the
READ + DIR attributes.
Pete
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