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* io/futimens.c: Add missing start-of-file descriptive comment. * io/utime.c: Likewise. * misc/futimesat.c: Likewise. * misc/utimes.c: Likewise. * sysdeps/mach/hurd/futimesat.c: Likewise. * sysdeps/mach/hurd/utimes.c: Likewise. * sysdeps/posix/utime.c: Likewise. * sysdeps/posix/utimes.c: Likewise. * sysdeps/unix/sysv/linux/futimesat.c: Likewise. * sysdeps/unix/sysv/linux/generic/futimesat.c: Likewise. * sysdeps/unix/sysv/linux/generic/utimes.c: Likewise. * sysdeps/unix/sysv/linux/utimes.c: Likewise.
This hierarchy supports Linux systems using the new asm-generic/unistd.h, which removes many familiar old syscalls. For example, to implement open(), newer Linux architectures require glibc to invoke the __NR_openat syscall with AT_FDCWD. This hierarchy provides all those implementations. It also provides support for 32-bit platforms using the 64-bit kernel syscall APIs, as the 32-bit ones are no longer provided. Note that newer ILP32 environments (x32 or AArch64:ILP32, for example) are converting to use more 64-bit types in kernel syscalls, so that aspect of this support is in more flux as of this writing.