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 UWA week 43 (2nd semester, study break) ↓
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4:28am Tue 24th Oct, Christopher M.

ANONYMOUS wrote:
> how do we check if a file is executable without using execv() to actually execute it? The usage of S_IXUSR in stat() appears to primarily help us check the execute permission. Could you advise on how to determine if a file is executable?
I don't believe that you can, other than by repeating what execv() does from within your own code. As you've suggested, using the stat permissions only check if a permission bit is set - you could, for example, set execute permissions on an MS-Word document, but that wouldn't make it executable. Of note, the permission mode bits - read, write, and execute - are checked by certain system-calls (e.g. opening a file) but they provide a necessary condition, not a sufficient one.

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