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The openat2 syscall was added on Linux 5.6, as an extension of openat. Unlike other open-like functions, the kernel only provides the LFS variant (so files larger than 4GB always succeed, unlike other functions with an offset larger than off_t). Also, similar to other open functions, the new symbol is a cancellable entrypoint. The test case added only stress tests for some of the syscalls' provided functionality, and it is based on an existing kernel self-test. A fortify wrapper is added to verify the argument size if not larger than the current support open_how struct. Gnulib added an openat2 module, which uses read-only for the open_how argument [1]. There is no clear indication whether the kernel will indeed use the argument as in-out, how it would do so, or for which kind of functionality [2]. Also, adding a potentially different prototype than gnulib only would add extra unnecessary friction and extra wrappers to handle it. Checked on x86_64-linux-gnu and aarch64-linux-gnu. [1] https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=0b97ffdf32bdab909d02449043447237273df75e [2] https://sourceware.org/pipermail/libc-alpha/2025-September/169740.html Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2 lines
25 B
C
2 lines
25 B
C
#include "tst-openat2.c"
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