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authorChris Metcalf <cmetcalf@ezchip.com>2015-03-19 13:33:01 -0400
committerChris Metcalf <cmetcalf@ezchip.com>2015-03-19 13:33:01 -0400
commitbecb26b84bfe4d3273c4e2d4e7684dfbbf7c6bcd (patch)
treed1f824e20cdc41700596f1a9580bbbfe9dbb2d87 /sysdeps
parentc2f5813ae0a68f6c6d69e66dac2da6e46b9df034 (diff)
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linux-generic: add a README
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-rw-r--r--sysdeps/unix/sysv/linux/generic/README11
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diff --git a/sysdeps/unix/sysv/linux/generic/README b/sysdeps/unix/sysv/linux/generic/README
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+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.