Since glibc-2.43, sys/pidfd.h defines struct pidfd_info, but its definition is slightly older compared with linux v6.19. See https://sourceware.org/git/?p=glibc.git;a=commit;h=c0c9524a11c56889ec5b1de2e0b78112f2ebc0b7 https://lore.kernel.org/all/20251028-work-coredump-signal-v1-0-ca449b7b7aa0@kernel.org/ This imports linux/pidfd.h (and linux/ioctl.h) from the kernel 7.2-rc6, and make our header that overrides sys/pidfd.h includes linux/pidfd.h. Then, we can always use uptodate definition of struct pidfd_info. Note, linux/pidfd.h includes linux/fcntl.h, but it conflicts glibc's fcntl.h. So, this also replaces linux/fcntl.h with glibc's fcntl.h.
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