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Huzaifa Sidhpurwala 2021-09-18 11:11:11 +05:30
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modules/ROOT/pages/programming-languages/C-Libc.adoc
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@ -305,7 +305,7 @@ This is the hardest system call to use correctly because of everything you have
* If `S_ISLNK` macro is used, the stat buffer MUST come from lstat or from fstatat with `AT_SYMLINK_NOFOLLOW`
* If you are doing something really important, call fstat after opening and compare the before and after stat buffers before trusting them.
=== `setgid`, `setuid`:
==== `setgid`, `setuid`:
* Call these in the right order: groups and then uid.
* Always check the return code.
* If `setgid` & `setuid` are used, supplemental groups are not reset. This must be done with setgroups or initgroups before the uid change.