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> The usage is like: > INTERNAL_SYSCALL_DECL (err); > retval = INTERNAL_SYSCALL (syscall_name, err, 3, arg1, arg2, arg3); > if (INTERNAL_SYSCALL_ERROR_P (retval, err)) > errno_from_syscall = INTERNAL_SYSCALL_ERRNO (retval, err); I guess this is ok, but a little bulky. If it's always `int err' and nonzero to indicate, on x86 that's something like "err = retval < 0 ? -retval : 0;". Does the compiler really fail to eliminate all that work if `err' is dead?
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