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linux-generic: add a README
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2015-03-19 Chris Metcalf <cmetcalf@ezchip.com>
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* sysdeps/unix/sysv/linux/generic/README: New file.
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2015-03-18 Joseph Myers <joseph@codesourcery.com>
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[BZ #18138]
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sysdeps/unix/sysv/linux/generic/README
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sysdeps/unix/sysv/linux/generic/README
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This hierarchy supports Linux systems using the new
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asm-generic/unistd.h, which removes many familiar old syscalls. For
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example, to implement open(), newer Linux architectures require glibc
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to invoke the __NR_openat syscall with AT_FDCWD. This hierarchy
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provides all those implementations.
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It also provides support for 32-bit platforms using the 64-bit kernel
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syscall APIs, as the 32-bit ones are no longer provided. Note that
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newer ILP32 environments (x32 or AArch64:ILP32, for example) are
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converting to use more 64-bit types in kernel syscalls, so that aspect
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of this support is in more flux as of this writing.
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