diff --git a/libc/include/android/api-level.h b/libc/include/android/api-level.h
index 18825e7..7a909d7 100644
--- a/libc/include/android/api-level.h
+++ b/libc/include/android/api-level.h
@@ -58,5 +58,6 @@
 #define __ANDROID_API_N_MR1__ 25
 #define __ANDROID_API_O__ 26
 #define __ANDROID_API_O_MR1__ 27
+#define __ANDROID_API_P__ 28
 
-#endif /* ANDROID_API_LEVEL_H */
+#endif
diff --git a/libc/include/glob.h b/libc/include/glob.h
index 6ae8573..0ba2848 100644
--- a/libc/include/glob.h
+++ b/libc/include/glob.h
@@ -90,8 +90,8 @@
 
 __BEGIN_DECLS
 
-int glob(const char* __pattern, int __flags, int (*__error_callback)(const char* __failure_path, int __failure_errno), glob_t* __result_ptr) __INTRODUCED_IN_FUTURE;
-void globfree(glob_t* __result_ptr) __INTRODUCED_IN_FUTURE;
+int glob(const char* __pattern, int __flags, int (*__error_callback)(const char* __failure_path, int __failure_errno), glob_t* __result_ptr) __INTRODUCED_IN(28);
+void globfree(glob_t* __result_ptr) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/libc/include/iconv.h b/libc/include/iconv.h
index 4b05bae..df8fa6d 100644
--- a/libc/include/iconv.h
+++ b/libc/include/iconv.h
@@ -37,9 +37,9 @@
 struct __iconv_t;
 typedef struct __iconv_t* iconv_t;
 
-iconv_t iconv_open(const char* __src_encoding, const char* __dst_encoding) __INTRODUCED_IN_FUTURE;
-size_t iconv(iconv_t __converter, char** __src_buf, size_t* __src_bytes_left, char** __dst_buf, size_t* __dst_bytes_left) __INTRODUCED_IN_FUTURE;
-int iconv_close(iconv_t __converter) __INTRODUCED_IN_FUTURE;
+iconv_t iconv_open(const char* __src_encoding, const char* __dst_encoding) __INTRODUCED_IN(28);
+size_t iconv(iconv_t __converter, char** __src_buf, size_t* __src_bytes_left, char** __dst_buf, size_t* __dst_bytes_left) __INTRODUCED_IN(28);
+int iconv_close(iconv_t __converter) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/libc/include/netdb.h b/libc/include/netdb.h
index 4ee0ce2..7a1987e 100644
--- a/libc/include/netdb.h
+++ b/libc/include/netdb.h
@@ -214,23 +214,23 @@
 int gethostbyname_r(const char* __name, struct hostent* __ret, char* __buf, size_t __buf_size, struct hostent** __result, int* __h_errno_ptr);
 struct hostent* gethostbyname2(const char* __name, int __af);
 int gethostbyname2_r(const char* __name, int __af, struct hostent* __ret, char* __buf, size_t __buf_size, struct hostent** __result, int* __h_errno_ptr) __INTRODUCED_IN(23);
-void endhostent(void) __INTRODUCED_IN_FUTURE;
+void endhostent(void) __INTRODUCED_IN(28);
 struct hostent* gethostent(void);
-void sethostent(int __stay_open) __INTRODUCED_IN_FUTURE;
+void sethostent(int __stay_open) __INTRODUCED_IN(28);
 
 /* These functions are obsolete. None of these functions return anything but nullptr. */
-void endnetent(void) __INTRODUCED_IN_FUTURE;
+void endnetent(void) __INTRODUCED_IN(28);
 struct netent* getnetbyaddr(uint32_t __net, int __type);
 struct netent* getnetbyname(const char* __name);
-struct netent* getnetent(void) __INTRODUCED_IN_FUTURE;
-void setnetent(int __stay_open) __INTRODUCED_IN_FUTURE;
+struct netent* getnetent(void) __INTRODUCED_IN(28);
+void setnetent(int __stay_open) __INTRODUCED_IN(28);
 
 /* None of these functions return anything but nullptr. */
-void endprotoent(void) __INTRODUCED_IN_FUTURE;
+void endprotoent(void) __INTRODUCED_IN(28);
 struct protoent* getprotobyname(const char* __name);
 struct protoent* getprotobynumber(int __proto);
-struct protoent* getprotoent(void) __INTRODUCED_IN_FUTURE;
-void setprotoent(int __stay_open) __INTRODUCED_IN_FUTURE;
+struct protoent* getprotoent(void) __INTRODUCED_IN(28);
+void setprotoent(int __stay_open) __INTRODUCED_IN(28);
 
 /* These functions return entries from a built-in database. */
 void endservent(void);
diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 97f023d..8d95a3b 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -230,7 +230,7 @@
 int pthread_setname_np(pthread_t __pthread, const char* __name);
 
 int pthread_setschedparam(pthread_t __pthread, int __policy, const struct sched_param* __param);
-int pthread_setschedprio(pthread_t __pthread, int __priority) __INTRODUCED_IN_FUTURE;
+int pthread_setschedprio(pthread_t __pthread, int __priority) __INTRODUCED_IN(28);
 
 int pthread_setspecific(pthread_key_t __key, const void* __value);
 
diff --git a/libc/include/search.h b/libc/include/search.h
index 5930bcd..97fdeda 100644
--- a/libc/include/search.h
+++ b/libc/include/search.h
@@ -40,14 +40,14 @@
 void insque(void* __element, void* __previous) __INTRODUCED_IN(21);
 void remque(void* __element) __INTRODUCED_IN(21);
 
-int hcreate(size_t) __INTRODUCED_IN_FUTURE;
-void hdestroy(void) __INTRODUCED_IN_FUTURE;
-ENTRY* hsearch(ENTRY, ACTION) __INTRODUCED_IN_FUTURE;
+int hcreate(size_t) __INTRODUCED_IN(28);
+void hdestroy(void) __INTRODUCED_IN(28);
+ENTRY* hsearch(ENTRY, ACTION) __INTRODUCED_IN(28);
 
 #if defined(__USE_BSD) || defined(__USE_GNU)
-int hcreate_r(size_t, struct hsearch_data*) __INTRODUCED_IN_FUTURE;
-void hdestroy_r(struct hsearch_data*) __INTRODUCED_IN_FUTURE;
-int hsearch_r(ENTRY, ACTION, ENTRY**, struct hsearch_data*) __INTRODUCED_IN_FUTURE;
+int hcreate_r(size_t, struct hsearch_data*) __INTRODUCED_IN(28);
+void hdestroy_r(struct hsearch_data*) __INTRODUCED_IN(28);
+int hsearch_r(ENTRY, ACTION, ENTRY**, struct hsearch_data*) __INTRODUCED_IN(28);
 #endif
 
 void* lfind(const void* __key, const void* __base, size_t* __count, size_t __size, int (*__comparator)(const void*, const void*))
diff --git a/libc/include/spawn.h b/libc/include/spawn.h
index ea4bb19..b5ac586 100644
--- a/libc/include/spawn.h
+++ b/libc/include/spawn.h
@@ -50,36 +50,36 @@
 typedef struct __posix_spawnattr* posix_spawnattr_t;
 typedef struct __posix_spawn_file_actions* posix_spawn_file_actions_t;
 
-int posix_spawn(pid_t* __pid, const char* __path, const posix_spawn_file_actions_t* __actions, const posix_spawnattr_t* __attr, char* const __argv[], char* const __env[]) __INTRODUCED_IN_FUTURE;
-int posix_spawnp(pid_t* __pid, const char* __file, const posix_spawn_file_actions_t* __actions, const posix_spawnattr_t* __attr, char* const __argv[], char* const __env[]) __INTRODUCED_IN_FUTURE;
+int posix_spawn(pid_t* __pid, const char* __path, const posix_spawn_file_actions_t* __actions, const posix_spawnattr_t* __attr, char* const __argv[], char* const __env[]) __INTRODUCED_IN(28);
+int posix_spawnp(pid_t* __pid, const char* __file, const posix_spawn_file_actions_t* __actions, const posix_spawnattr_t* __attr, char* const __argv[], char* const __env[]) __INTRODUCED_IN(28);
 
-int posix_spawnattr_init(posix_spawnattr_t* __attr) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_destroy(posix_spawnattr_t* __attr) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_init(posix_spawnattr_t* __attr) __INTRODUCED_IN(28);
+int posix_spawnattr_destroy(posix_spawnattr_t* __attr) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setflags(posix_spawnattr_t* __attr, short __flags) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getflags(const posix_spawnattr_t* __attr, short* __flags) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setflags(posix_spawnattr_t* __attr, short __flags) __INTRODUCED_IN(28);
+int posix_spawnattr_getflags(const posix_spawnattr_t* __attr, short* __flags) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setpgroup(posix_spawnattr_t* __attr, pid_t __pgroup) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getpgroup(const posix_spawnattr_t* __attr, pid_t* __pgroup) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setpgroup(posix_spawnattr_t* __attr, pid_t __pgroup) __INTRODUCED_IN(28);
+int posix_spawnattr_getpgroup(const posix_spawnattr_t* __attr, pid_t* __pgroup) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setsigmask(posix_spawnattr_t* __attr, const sigset_t* __mask) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getsigmask(const posix_spawnattr_t* __attr, sigset_t* __mask) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setsigmask(posix_spawnattr_t* __attr, const sigset_t* __mask) __INTRODUCED_IN(28);
+int posix_spawnattr_getsigmask(const posix_spawnattr_t* __attr, sigset_t* __mask) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setsigdefault(posix_spawnattr_t* __attr, const sigset_t* __mask) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getsigdefault(const posix_spawnattr_t* __attr, sigset_t* __mask) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setsigdefault(posix_spawnattr_t* __attr, const sigset_t* __mask) __INTRODUCED_IN(28);
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t* __attr, sigset_t* __mask) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setschedparam(posix_spawnattr_t* __attr, const struct sched_param* __param) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getschedparam(const posix_spawnattr_t* __attr, struct sched_param* __param) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setschedparam(posix_spawnattr_t* __attr, const struct sched_param* __param) __INTRODUCED_IN(28);
+int posix_spawnattr_getschedparam(const posix_spawnattr_t* __attr, struct sched_param* __param) __INTRODUCED_IN(28);
 
-int posix_spawnattr_setschedpolicy(posix_spawnattr_t* __attr, int __policy) __INTRODUCED_IN_FUTURE;
-int posix_spawnattr_getschedpolicy(const posix_spawnattr_t* __attr, int* __policy) __INTRODUCED_IN_FUTURE;
+int posix_spawnattr_setschedpolicy(posix_spawnattr_t* __attr, int __policy) __INTRODUCED_IN(28);
+int posix_spawnattr_getschedpolicy(const posix_spawnattr_t* __attr, int* __policy) __INTRODUCED_IN(28);
 
-int posix_spawn_file_actions_init(posix_spawn_file_actions_t* __actions) __INTRODUCED_IN_FUTURE;
-int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t* __actions) __INTRODUCED_IN_FUTURE;
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t* __actions) __INTRODUCED_IN(28);
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t* __actions) __INTRODUCED_IN(28);
 
-int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t* __actions, int __fd, const char* __path, int __flags, mode_t __mode) __INTRODUCED_IN_FUTURE;
-int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t* __actions, int __fd) __INTRODUCED_IN_FUTURE;
-int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t* __actions, int __fd, int __new_fd) __INTRODUCED_IN_FUTURE;
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t* __actions, int __fd, const char* __path, int __flags, mode_t __mode) __INTRODUCED_IN(28);
+int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t* __actions, int __fd) __INTRODUCED_IN(28);
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t* __actions, int __fd, int __new_fd) __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index e02a371..2d9cc31 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -260,16 +260,16 @@
 #endif
 
 #if defined(__USE_BSD)
-int fflush_unlocked(FILE* __fp) __INTRODUCED_IN_FUTURE;
-int fgetc_unlocked(FILE* __fp) __INTRODUCED_IN_FUTURE;
-int fputc_unlocked(int __ch, FILE* __fp) __INTRODUCED_IN_FUTURE;
-size_t fread_unlocked(void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN_FUTURE;
-size_t fwrite_unlocked(const void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN_FUTURE;
+int fflush_unlocked(FILE* __fp) __INTRODUCED_IN(28);
+int fgetc_unlocked(FILE* __fp) __INTRODUCED_IN(28);
+int fputc_unlocked(int __ch, FILE* __fp) __INTRODUCED_IN(28);
+size_t fread_unlocked(void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN(28);
+size_t fwrite_unlocked(const void* __buf, size_t __size, size_t __count, FILE* __fp) __INTRODUCED_IN(28);
 #endif
 
 #if defined(__USE_GNU)
-int fputs_unlocked(const char* __s, FILE* __fp) __INTRODUCED_IN_FUTURE;
-char* fgets_unlocked(char* __buf, int __size, FILE* __fp) __INTRODUCED_IN_FUTURE;
+int fputs_unlocked(const char* __s, FILE* __fp) __INTRODUCED_IN(28);
+char* fgets_unlocked(char* __buf, int __size, FILE* __fp) __INTRODUCED_IN(28);
 #endif
 
 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
diff --git a/libc/include/stdio_ext.h b/libc/include/stdio_ext.h
index 66a3ab9..2f0f438 100644
--- a/libc/include/stdio_ext.h
+++ b/libc/include/stdio_ext.h
@@ -37,9 +37,9 @@
 
 size_t __fbufsize(FILE* __fp) __INTRODUCED_IN(23);
 int __freadable(FILE* __fp) __INTRODUCED_IN(23);
-int __freading(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __freading(FILE* __fp) __INTRODUCED_IN(28);
 int __fwritable(FILE* __fp) __INTRODUCED_IN(23);
-int __fwriting(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __fwriting(FILE* __fp) __INTRODUCED_IN(28);
 int __flbf(FILE* __fp) __INTRODUCED_IN(23);
 void __fpurge(FILE* __fp) __INTRODUCED_IN(23);
 size_t __fpending(FILE* __fp) __INTRODUCED_IN(23);
diff --git a/libc/include/sys/random.h b/libc/include/sys/random.h
index 3475652..4b849f3 100644
--- a/libc/include/sys/random.h
+++ b/libc/include/sys/random.h
@@ -38,9 +38,9 @@
 
 /* See also arc4random_buf in <stdlib.h>, which is available in all API levels. */
 
-int getentropy(void* __buffer, size_t __buffer_size) __wur __INTRODUCED_IN_FUTURE;
+int getentropy(void* __buffer, size_t __buffer_size) __wur __INTRODUCED_IN(28);
 
-ssize_t getrandom(void* __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN_FUTURE;
+ssize_t getrandom(void* __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN(28);
 
 __END_DECLS
 
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index ef75c84..f191028 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -98,7 +98,7 @@
 int execlp(const char* __file, const char* __arg0, ...) __attribute__((__sentinel__));
 int execle(const char* __path, const char* __arg0, ... /*,  char* const* __envp */)
     __attribute__((__sentinel__(1)));
-int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN_FUTURE;
+int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN(28);
 
 int nice(int __incr);
 
@@ -119,7 +119,7 @@
 int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid);
 int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid);
 char* getlogin(void);
-int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN_FUTURE;
+int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
 
 long fpathconf(int __fd, int __name);
 long pathconf(const char* __path, int __name);
@@ -152,7 +152,7 @@
 
 void sync(void);
 #if defined(__USE_GNU)
-int syncfs(int __fd) __INTRODUCED_IN_FUTURE;
+int syncfs(int __fd) __INTRODUCED_IN(28);
 #endif
 
 int close(int __fd);
@@ -243,7 +243,7 @@
 int getdomainname(char* __buf, size_t __buf_size) __INTRODUCED_IN(26);
 int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
 
-void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN_FUTURE;
+void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN(28);
 
 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
 #include <bits/fortify/unistd.h>
@@ -251,4 +251,4 @@
 
 __END_DECLS
 
-#endif /* _UNISTD_H_ */
+#endif