ndk: <unistd.h>: minor cleanup

- Cleanup declaration of lseek64() to use off64_t instead of loff_t
- Cleanup declaration of prctl() to use variable number of arguments

The cleanups are performed to better match upstream.

Change-Id: I3c9420e328c3772bbb57dc9108dc879aa698a981
diff --git a/ndk/platforms/android-3/include/sys/prctl.h b/ndk/platforms/android-3/include/sys/prctl.h
index ce85bf7..359d684 100644
--- a/ndk/platforms/android-3/include/sys/prctl.h
+++ b/ndk/platforms/android-3/include/sys/prctl.h
@@ -32,8 +32,13 @@
 
 __BEGIN_DECLS
 
-extern int prctl(int option, unsigned long arg2, unsigned long arg3 , unsigned
-               long arg4, unsigned long arg5);
+/* IMPORTANT NOTE: This function is declared as taking a variable number
+ *                 of arguments to match the GLibc definition. However
+ *                 its declaration inside SYSCALLS.TXT *must* make it
+ *                 take 6 arguments to ensure consistency with the kernel
+ *                 implementation.
+ */
+extern int prctl(int option, ...);
 
 __END_DECLS
 
diff --git a/ndk/platforms/android-3/include/unistd.h b/ndk/platforms/android-3/include/unistd.h
index 25fc334..53088d4 100644
--- a/ndk/platforms/android-3/include/unistd.h
+++ b/ndk/platforms/android-3/include/unistd.h
@@ -70,8 +70,9 @@
 extern int execle(const char *, const char *, ...);
 extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
-extern int prctl(int  option,  unsigned long arg2, unsigned long arg3,
-                 unsigned long arg4, unsigned long arg5);
+
+/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
+extern int prctl(int  option, ...);
 
 extern int nice(int);
 
@@ -121,7 +122,7 @@
 
 extern int close(int);
 extern off_t lseek(int, off_t, int);
-extern loff_t lseek64(int, loff_t, int);
+extern off64_t lseek64(int, off64_t, int);
 
 extern ssize_t read(int, void *, size_t);
 extern ssize_t write(int, const void *, size_t);
diff --git a/ndk/platforms/android-8/include/unistd.h b/ndk/platforms/android-8/include/unistd.h
index 863d56d..ab8aee2 100644
--- a/ndk/platforms/android-8/include/unistd.h
+++ b/ndk/platforms/android-8/include/unistd.h
@@ -70,8 +70,9 @@
 extern int execle(const char *, const char *, ...);
 extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
-extern int prctl(int  option,  unsigned long arg2, unsigned long arg3,
-                 unsigned long arg4, unsigned long arg5);
+
+/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
+extern int prctl(int  option, ...);
 
 extern int nice(int);
 
@@ -125,7 +126,7 @@
 
 extern int close(int);
 extern off_t lseek(int, off_t, int);
-extern loff_t lseek64(int, loff_t, int);
+extern off64_t lseek64(int, off64_t, int);
 
 extern ssize_t read(int, void *, size_t);
 extern ssize_t write(int, const void *, size_t);
diff --git a/ndk/platforms/android-9/include/unistd.h b/ndk/platforms/android-9/include/unistd.h
index 21154ad..f92ec10 100644
--- a/ndk/platforms/android-9/include/unistd.h
+++ b/ndk/platforms/android-9/include/unistd.h
@@ -70,8 +70,9 @@
 extern int execle(const char *, const char *, ...);
 extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
-extern int prctl(int  option,  unsigned long arg2, unsigned long arg3,
-                 unsigned long arg4, unsigned long arg5);
+
+/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
+extern int prctl(int  option, ...);
 
 extern int nice(int);
 
@@ -128,7 +129,7 @@
 
 extern int close(int);
 extern off_t lseek(int, off_t, int);
-extern loff_t lseek64(int, loff_t, int);
+extern off64_t lseek64(int, off64_t, int);
 
 extern ssize_t read(int, void *, size_t);
 extern ssize_t write(int, const void *, size_t);