use wrapper headers to hide most namespaced/internally-public symbols

not all prefixed symbols can be made hidden. some are part of
ABI-compat (e.g. __nl_langinfo_l) and others are ABI as a consequence
of the way copy relocations for weak aliases work in ELF shared
libraries. most, however, can be made hidden.

with this commit, there should be no remaining unintentionally visible
symbols exported from libc.so.

src/include/arpa/inet.h

@@ -3,6 +3,6 @@
 
 #include "../../../include/arpa/inet.h"
 
-int __inet_aton(const char *, struct in_addr *);
+hidden int __inet_aton(const char *, struct in_addr *);
 
 #endif

src/include/crypt.h

@@ -3,12 +3,14 @@
 
 #include "../../include/crypt.h"
 
-char *__crypt_r(const char *, const char *, struct crypt_data *);
+#include <features.h>
 
-char *__crypt_des(const char *, const char *, char *);
-char *__crypt_md5(const char *, const char *, char *);
-char *__crypt_blowfish(const char *, const char *, char *);
-char *__crypt_sha256(const char *, const char *, char *);
-char *__crypt_sha512(const char *, const char *, char *);
+hidden char *__crypt_r(const char *, const char *, struct crypt_data *);
+
+hidden char *__crypt_des(const char *, const char *, char *);
+hidden char *__crypt_md5(const char *, const char *, char *);
+hidden char *__crypt_blowfish(const char *, const char *, char *);
+hidden char *__crypt_sha256(const char *, const char *, char *);
+hidden char *__crypt_sha512(const char *, const char *, char *);
 
 #endif

src/include/pthread.h

@@ -3,20 +3,20 @@
 
 #include "../../include/pthread.h"
 
-int __pthread_once(pthread_once_t *, void (*)(void));
-void __pthread_testcancel(void);
-int __pthread_setcancelstate(int, int *);
-int __pthread_create(pthread_t *restrict, const pthread_attr_t *restrict, void *(*)(void *), void *restrict);
-_Noreturn void __pthread_exit(void *);
-int __pthread_join(pthread_t, void **);
-int __pthread_mutex_lock(pthread_mutex_t *);
-int __pthread_mutex_trylock(pthread_mutex_t *);
-int __pthread_mutex_trylock_owner(pthread_mutex_t *);
-int __pthread_mutex_timedlock(pthread_mutex_t *restrict, const struct timespec *restrict);
-int __pthread_mutex_unlock(pthread_mutex_t *);
-int __private_cond_signal(pthread_cond_t *, int);
-int __pthread_cond_timedwait(pthread_cond_t *restrict, pthread_mutex_t *restrict, const struct timespec *restrict);
-int __pthread_key_create(pthread_key_t *, void (*)(void *));
-int __pthread_key_delete(pthread_key_t);
+hidden int __pthread_once(pthread_once_t *, void (*)(void));
+hidden void __pthread_testcancel(void);
+hidden int __pthread_setcancelstate(int, int *);
+hidden int __pthread_create(pthread_t *restrict, const pthread_attr_t *restrict, void *(*)(void *), void *restrict);
+hidden _Noreturn void __pthread_exit(void *);
+hidden int __pthread_join(pthread_t, void **);
+hidden int __pthread_mutex_lock(pthread_mutex_t *);
+hidden int __pthread_mutex_trylock(pthread_mutex_t *);
+hidden int __pthread_mutex_trylock_owner(pthread_mutex_t *);
+hidden int __pthread_mutex_timedlock(pthread_mutex_t *restrict, const struct timespec *restrict);
+hidden int __pthread_mutex_unlock(pthread_mutex_t *);
+hidden int __private_cond_signal(pthread_cond_t *, int);
+hidden int __pthread_cond_timedwait(pthread_cond_t *restrict, pthread_mutex_t *restrict, const struct timespec *restrict);
+hidden int __pthread_key_create(pthread_key_t *, void (*)(void *));
+hidden int __pthread_key_delete(pthread_key_t);
 
 #endif

src/include/resolv.h

@@ -3,10 +3,10 @@
 
 #include "../../include/resolv.h"
 
-int __dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int);
+hidden int __dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int);
 
-int __res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int);
-int __res_send(const unsigned char *, int, unsigned char *, int);
-int __res_msend(int, const unsigned char *const *, const int *, unsigned char *const *, int *, int);
+hidden int __res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int);
+hidden int __res_send(const unsigned char *, int, unsigned char *, int);
+hidden int __res_msend(int, const unsigned char *const *, const int *, unsigned char *const *, int *, int);
 
 #endif

src/include/signal.h

@@ -3,12 +3,12 @@
 
 #include "../../include/signal.h"
 
-int __sigaction(int, const struct sigaction *, struct sigaction *);
+hidden int __sigaction(int, const struct sigaction *, struct sigaction *);
 
-void __block_all_sigs(void *);
-void __block_app_sigs(void *);
-void __restore_sigs(void *);
+hidden void __block_all_sigs(void *);
+hidden void __block_app_sigs(void *);
+hidden void __restore_sigs(void *);
 
-void __get_handler_set(sigset_t *);
+hidden void __get_handler_set(sigset_t *);
 
 #endif

src/include/stdlib.h

@@ -3,10 +3,10 @@
 
 #include "../../include/stdlib.h"
 
-int __putenv(char *, size_t, char *);
-void __env_rm_add(char *, char *);
-int __mkostemps(char *, int, int);
-int __ptsname_r(int, char *, size_t);
-char *__randname(char *);
+hidden int __putenv(char *, size_t, char *);
+hidden void __env_rm_add(char *, char *);
+hidden int __mkostemps(char *, int, int);
+hidden int __ptsname_r(int, char *, size_t);
+hidden char *__randname(char *);
 
 #endif

src/include/string.h

@@ -3,9 +3,9 @@
 
 #include "../../include/string.h"
 
-void *__memrchr(const void *, int, size_t);
-char *__stpcpy(char *, const char *);
-char *__stpncpy(char *, const char *, size_t);
-char *__strchrnul(const char *, int);
+hidden void *__memrchr(const void *, int, size_t);
+hidden char *__stpcpy(char *, const char *);
+hidden char *__stpncpy(char *, const char *, size_t);
+hidden char *__strchrnul(const char *, int);
 
 #endif

src/include/sys/mman.h

@@ -3,18 +3,18 @@
 
 #include "../../../include/sys/mman.h"
 
-void __vm_wait(void);
-void __vm_lock(void);
-void __vm_unlock(void);
+hidden void __vm_wait(void);
+hidden void __vm_lock(void);
+hidden void __vm_unlock(void);
 
-void *__mmap(void *, size_t, int, int, int, off_t);
-int __munmap(void *, size_t);
-void *__mremap(void *, size_t, size_t, int, ...);
-int __madvise(void *, size_t, int);
-int __mprotect(void *, size_t, int);
+hidden void *__mmap(void *, size_t, int, int, int, off_t);
+hidden int __munmap(void *, size_t);
+hidden void *__mremap(void *, size_t, size_t, int, ...);
+hidden int __madvise(void *, size_t, int);
+hidden int __mprotect(void *, size_t, int);
 
-const unsigned char *__map_file(const char *, size_t *);
+hidden const unsigned char *__map_file(const char *, size_t *);
 
-char *__shm_mapname(const char *, char *);
+hidden char *__shm_mapname(const char *, char *);
 
 #endif

src/include/sys/sysinfo.h

@@ -2,7 +2,8 @@
 #define SYS_SYSINFO_H
 
 #include "../../../include/sys/sysinfo.h"
+#include <features.h>
 
-int __lsysinfo(struct sysinfo *);
+hidden int __lsysinfo(struct sysinfo *);
 
 #endif

src/include/sys/time.h

@@ -3,6 +3,6 @@
 
 #include "../../../include/sys/time.h"
 
-int __futimesat(int, const char *, const struct timeval [2]);
+hidden int __futimesat(int, const char *, const struct timeval [2]);
 
 #endif

src/include/time.h

@@ -3,12 +3,12 @@
 
 #include "../../include/time.h"
 
-int __clock_gettime(clockid_t, struct timespec *);
+hidden int __clock_gettime(clockid_t, struct timespec *);
 
-char *__asctime_r(const struct tm *, char *);
-struct tm *__gmtime_r(const time_t *restrict, struct tm *restrict);
-struct tm *__localtime_r(const time_t *restrict, struct tm *restrict);
+hidden char *__asctime_r(const struct tm *, char *);
+hidden struct tm *__gmtime_r(const time_t *restrict, struct tm *restrict);
+hidden struct tm *__localtime_r(const time_t *restrict, struct tm *restrict);
 
-size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
+hidden size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
 
 #endif

src/include/unistd.h

@@ -5,8 +5,9 @@
 
 extern char **__environ;
 
-int __dup3(int, int, int);
-int __mkostemps(char *, int, int);
-int __execvpe(const char *, char *const *, char *const *);
+hidden int __dup3(int, int, int);
+hidden int __mkostemps(char *, int, int);
+hidden int __execvpe(const char *, char *const *, char *const *);
+hidden int __aio_close(int);
 
 #endif