unify stub logic

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

31 files changed, 195 insertions, 275 deletions

diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index aa459e06a..f152a9666 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -665,15 +665,6 @@ config UCLIBC_HAS_STUBS
 	  functions which are impossible to implement on the target
 	  architecture. Otherwise, such functions are simply omitted.
 
-	  As of 2008-07, this option makes uClibc provide fork() stub
-	  on NOMMU targets. It always sets errno to ENOSYS and returns -1.
-
-	  This may be useful if you port a lot of software and cannot
-	  audit all of it and replace or disable fork() usage.
-	  With this option, a program which uses fork() will build
-	  successfully. Of course, it may be useless if fork()
-	  is essential for its operation.
-
 config UCLIBC_HAS_SHADOW
 	bool "Shadow Password Support"
 	default y
diff --git a/libc/sysdeps/linux/arm/posix_fadvise.c b/libc/sysdeps/linux/arm/posix_fadvise.c
index 278bff981..80d3c5044 100644
--- a/libc/sysdeps/linux/arm/posix_fadvise.c
+++ b/libc/sysdeps/linux/arm/posix_fadvise.c
@@ -39,7 +39,7 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advise)
 
 /* weak_alias(__libc_posix_fadvise, posix_fadvise); */
 
-#else
+#elif defined __UCLIBC_HAS_STUBS__
 
 int posix_fadvise(int fd attribute_unused, off_t offset attribute_unused, off_t len attribute_unused, int advice attribute_unused)
 {
diff --git a/libc/sysdeps/linux/arm/posix_fadvise64.c b/libc/sysdeps/linux/arm/posix_fadvise64.c
index 4b27381d1..678c42f90 100644
--- a/libc/sysdeps/linux/arm/posix_fadvise64.c
+++ b/libc/sysdeps/linux/arm/posix_fadvise64.c
@@ -47,7 +47,7 @@ int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advise)
 
 /* weak_alias(__libc_posix_fadvise64, posix_fadvise64); */
 
-#else
+#elif defined __UCLIBC_HAS_STUBS__
 
 int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advise)
 {
diff --git a/libc/sysdeps/linux/common/__rt_sigtimedwait.c b/libc/sysdeps/linux/common/__rt_sigtimedwait.c
index a7ab8fb61..26860d2d2 100644
--- a/libc/sysdeps/linux/common/__rt_sigtimedwait.c
+++ b/libc/sysdeps/linux/common/__rt_sigtimedwait.c
@@ -86,16 +86,6 @@ int attribute_hidden __sigtimedwait(const sigset_t * set, siginfo_t * info,
 	return __rt_sigtimedwait(set, info, timeout, _NSIG / 8);
 }
 # endif /* !__UCLIBC_HAS_THREADS_NATIVE__ */
-#else
-int attribute_hidden __sigtimedwait(const sigset_t * set, siginfo_t * info,
-									const struct timespec *timeout)
-{
-	if (set == NULL)
-		__set_errno(EINVAL);
-	else
-		__set_errno(ENOSYS);
-	return -1;
-}
-#endif
 weak_alias(__sigtimedwait,sigtimedwait)
 libc_hidden_weak(sigtimedwait)
+#endif
diff --git a/libc/sysdeps/linux/common/__rt_sigwaitinfo.c b/libc/sysdeps/linux/common/__rt_sigwaitinfo.c
index 92a11c9b6..6b4332715 100644
--- a/libc/sysdeps/linux/common/__rt_sigwaitinfo.c
+++ b/libc/sysdeps/linux/common/__rt_sigwaitinfo.c
@@ -83,16 +83,7 @@ int attribute_hidden __sigwaitinfo(const sigset_t * set, siginfo_t * info)
 	return __rt_sigwaitinfo(set, info, NULL, _NSIG / 8);
 }
 # endif
-#else
-int attribute_hidden __sigwaitinfo(const sigset_t * set, siginfo_t * info)
-{
-	if (set == NULL)
-		__set_errno(EINVAL);
-	else
-		__set_errno(ENOSYS);
-	return -1;
-}
-#endif
 libc_hidden_proto(sigwaitinfo)
 weak_alias (__sigwaitinfo, sigwaitinfo)
 libc_hidden_weak(sigwaitinfo)
+#endif
diff --git a/libc/sysdeps/linux/common/bdflush.c b/libc/sysdeps/linux/common/bdflush.c
index 687a8f9a7..c2a05ed88 100644
--- a/libc/sysdeps/linux/common/bdflush.c
+++ b/libc/sysdeps/linux/common/bdflush.c
@@ -12,10 +12,4 @@
 
 #ifdef __NR_bdflush
 _syscall2(int, bdflush, int, __func, long int, __data)
-#else
-int bdflush(int __func, long int __data)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/capget.c b/libc/sysdeps/linux/common/capget.c
index 361de845d..c3e8c5771 100644
--- a/libc/sysdeps/linux/common/capget.c
+++ b/libc/sysdeps/linux/common/capget.c
@@ -11,10 +11,4 @@
 int capget(void *header, void *data);
 #ifdef __NR_capget
 _syscall2(int, capget, void *, header, void *, data)
-#else
-int capget(void *header, void *data)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/capset.c b/libc/sysdeps/linux/common/capset.c
index 0a77e05f4..c0cf5deb0 100644
--- a/libc/sysdeps/linux/common/capset.c
+++ b/libc/sysdeps/linux/common/capset.c
@@ -8,13 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
 int capset(void *header, const void *data);
 #ifdef __NR_capset
 _syscall2(int, capset, void *, header, const void *, data)
-#elif defined __UCLIBC_HAS_STUBS__
-int capset(void *header, const void *data)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/create_module.c b/libc/sysdeps/linux/common/create_module.c
index d8f24466d..ddd7c4cff 100644
--- a/libc/sysdeps/linux/common/create_module.c
+++ b/libc/sysdeps/linux/common/create_module.c
@@ -49,11 +49,4 @@ unsigned long create_module(const char *name, size_t size)
 _syscall2(unsigned long, create_module, const char *, name, size_t, size)
 #endif
 
-#else /* !__NR_create_module */
-caddr_t create_module(const char *name attribute_unused, size_t size attribute_unused);
-caddr_t create_module(const char *name attribute_unused, size_t size attribute_unused)
-{
-	__set_errno(ENOSYS);
-	return (caddr_t)-1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/delete_module.c b/libc/sysdeps/linux/common/delete_module.c
index 44f9b30ae..8ac6e559e 100644
--- a/libc/sysdeps/linux/common/delete_module.c
+++ b/libc/sysdeps/linux/common/delete_module.c
@@ -10,10 +10,4 @@
 int delete_module(const char *name, unsigned int flags);
 #ifdef __NR_delete_module
 _syscall2(int, delete_module, const char *, name, unsigned int, flags)
-#elif defined __UCLIBC_HAS_STUBS__
-int delete_module(const char *name, unsigned int flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/epoll.c b/libc/sysdeps/linux/common/epoll.c
index 86272d9aa..dda92282e 100644
--- a/libc/sysdeps/linux/common/epoll.c
+++ b/libc/sysdeps/linux/common/epoll.c
@@ -15,12 +15,6 @@
  */
 #ifdef __NR_epoll_create
 _syscall1(int, epoll_create, int, size)
-#else
-int epoll_create(int size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 /*
@@ -28,12 +22,6 @@ int epoll_create(int size)
  */
 #ifdef __NR_epoll_ctl
 _syscall4(int,epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event)
-#else
-int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
 
 /*
@@ -41,10 +29,4 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
  */
 #ifdef __NR_epoll_wait
 _syscall4(int, epoll_wait, int, epfd, struct epoll_event *, events, int, maxevents, int, timeout)
-#else
-int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/fdatasync.c b/libc/sysdeps/linux/common/fdatasync.c
index 19d37b6e0..e51c72365 100644
--- a/libc/sysdeps/linux/common/fdatasync.c
+++ b/libc/sysdeps/linux/common/fdatasync.c
@@ -40,11 +40,4 @@ int fdatasync(int fd)
 # endif
 }
 
-#elif defined __UCLIBC_HAS_STUBS__
-/* no syscall available, so provide a stub */
-int fdatasync(int fd)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/fork.c b/libc/sysdeps/linux/common/fork.c
index f21ec35b8..14e00a2cd 100644
--- a/libc/sysdeps/linux/common/fork.c
+++ b/libc/sysdeps/linux/common/fork.c
@@ -20,16 +20,4 @@ weak_alias(__libc_fork,fork)
 libc_hidden_weak(fork)
 #endif
 
-#elif defined __UCLIBC_HAS_STUBS__
-
-extern __typeof(fork) __libc_fork;
-pid_t __libc_fork(void)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
-weak_alias(__libc_fork,fork)
-libc_hidden_weak(fork)
-link_warning(fork, "fork: this function is not implemented on no-mmu systems")
-
 #endif
diff --git a/libc/sysdeps/linux/common/get_kernel_syms.c b/libc/sysdeps/linux/common/get_kernel_syms.c
index d6595eaf5..6124a81d4 100644
--- a/libc/sysdeps/linux/common/get_kernel_syms.c
+++ b/libc/sysdeps/linux/common/get_kernel_syms.c
@@ -13,10 +13,4 @@ struct kernel_sym;
 int get_kernel_syms(struct kernel_sym *table attribute_unused);
 #ifdef __NR_get_kernel_syms
 _syscall1(int, get_kernel_syms, struct kernel_sym *, table)
-#else
-int get_kernel_syms(struct kernel_sym *table attribute_unused)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/getpgrp.c b/libc/sysdeps/linux/common/getpgrp.c
index 5d36ba155..80a53daee 100644
--- a/libc/sysdeps/linux/common/getpgrp.c
+++ b/libc/sysdeps/linux/common/getpgrp.c
@@ -19,10 +19,4 @@ pid_t getpgrp(void)
 {
 	return getpgid(getpid());
 }
-#elif defined __UCLIBC_HAS_STUBS__
-pid_t getpgrp(void)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/init_module.c b/libc/sysdeps/linux/common/init_module.c
index 8a6e94199..cf6d74721 100644
--- a/libc/sysdeps/linux/common/init_module.c
+++ b/libc/sysdeps/linux/common/init_module.c
@@ -15,11 +15,5 @@ int init_module(void *first, void *second, void *third, void *fourth, void *fift
  * and let the kernel cope with whatever it gets.  It's good at that. */
 _syscall5(int, init_module, void *, first, void *, second, void *, third,
 		  void *, fourth, void *, fifth)
-#else
-int init_module(void *first, void *second, void *third, void *fourth, void *fifth)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
 
diff --git a/libc/sysdeps/linux/common/pivot_root.c b/libc/sysdeps/linux/common/pivot_root.c
index 3e9705903..0e738d53f 100644
--- a/libc/sysdeps/linux/common/pivot_root.c
+++ b/libc/sysdeps/linux/common/pivot_root.c
@@ -12,10 +12,4 @@
 int pivot_root(const char *new_root, const char *put_old);
 #ifdef __NR_pivot_root
 _syscall2(int, pivot_root, const char *, new_root, const char *, put_old)
-#else
-int pivot_root(const char *new_root, const char *put_old)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/posix_fadvise.c b/libc/sysdeps/linux/common/posix_fadvise.c
index 7c43be959..17831c201 100644
--- a/libc/sysdeps/linux/common/posix_fadvise.c
+++ b/libc/sysdeps/linux/common/posix_fadvise.c
@@ -27,10 +27,9 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advice)
 strong_alias(posix_fadvise,posix_fadvise64)
 #endif
 
-#else
+#elif defined __UCLIBC_HAS_STUBS__
 int posix_fadvise(int fd attribute_unused, off_t offset attribute_unused, off_t len attribute_unused, int advice attribute_unused)
 {
-#warning This is not correct as far as SUSv3 is concerned.
 	return ENOSYS;
 }
 #endif
diff --git a/libc/sysdeps/linux/common/posix_fadvise64.c b/libc/sysdeps/linux/common/posix_fadvise64.c
index b53e64321..e8a530fdf 100644
--- a/libc/sysdeps/linux/common/posix_fadvise64.c
+++ b/libc/sysdeps/linux/common/posix_fadvise64.c
@@ -58,13 +58,12 @@ int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 #error your machine is neither 32 bit or 64 bit ... it must be magical
 #endif
 
-#elif !defined __NR_fadvise64
+#elif !defined __NR_fadvise64 && defined __UCLIBC_HAS_STUBS__
 /* This is declared as a strong alias in posix_fadvise.c if __NR_fadvise64
  * is defined.
  */
 int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 {
-#warning This is not correct as far as SUSv3 is concerned.
 	return ENOSYS;
 }
 #endif /* __NR_fadvise64_64 */
diff --git a/libc/sysdeps/linux/common/query_module.c b/libc/sysdeps/linux/common/query_module.c
index 0f3d4700c..7c168df45 100644
--- a/libc/sysdeps/linux/common/query_module.c
+++ b/libc/sysdeps/linux/common/query_module.c
@@ -13,11 +13,4 @@ int query_module(const char *name attribute_unused, int which attribute_unused,
 #ifdef __NR_query_module
 _syscall5(int, query_module, const char *, name, int, which,
 		  void *, buf, size_t, bufsize, size_t *, ret)
-#elif defined __UCLIBC_HAS_STUBS__
-int query_module(const char *name attribute_unused, int which attribute_unused,
-				 void *buf attribute_unused, size_t bufsize attribute_unused, size_t * ret attribute_unused)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/sched_getaffinity.c b/libc/sysdeps/linux/common/sched_getaffinity.c
index 5d5e5b2c4..8982582cc 100644
--- a/libc/sysdeps/linux/common/sched_getaffinity.c
+++ b/libc/sysdeps/linux/common/sched_getaffinity.c
@@ -44,11 +44,5 @@ int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
 	}
 	return res;
 }
-#elif defined __UCLIBC_HAS_STUBS__
-int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 #endif
diff --git a/libc/sysdeps/linux/common/sched_setaffinity.c b/libc/sysdeps/linux/common/sched_setaffinity.c
index 1a0f55f75..980c44199 100644
--- a/libc/sysdeps/linux/common/sched_setaffinity.c
+++ b/libc/sysdeps/linux/common/sched_setaffinity.c
@@ -70,16 +70,5 @@ int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
 
 	return INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset);
 }
-#else
-#define ___HAVE_NO_sched_setaffinity
 #endif
-
-#if defined ___HAVE_NO_sched_setaffinity && defined __UCLIBC_HAS_STUBS__
-int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
-#endif
-
 #endif /* __USE_GNU */
diff --git a/libc/sysdeps/linux/common/signalfd.c b/libc/sysdeps/linux/common/signalfd.c
index 3d76e04c4..a0c995a89 100644
--- a/libc/sysdeps/linux/common/signalfd.c
+++ b/libc/sysdeps/linux/common/signalfd.c
@@ -21,8 +21,7 @@ static __inline__ _syscall3(int, __syscall_signalfd, int, fd,
 		const sigset_t *, mask, size_t, sizemask)
 #endif
 
-#if defined __NR_signalfd4 || defined __NR_signalfd \
-	|| defined __UCLIBC_HAS_STUBS__
+#if defined __NR_signalfd4 || defined __NR_signalfd
 int signalfd (int fd, const sigset_t *mask, int flags)
 {
 #if defined __NR___syscall_signalfd4
@@ -33,9 +32,6 @@ int signalfd (int fd, const sigset_t *mask, int flags)
 		return -1;
 	}
 	return __syscall_signalfd(fd, mask, _NSIG / 8);
-#elif defined __UCLIBC_HAS_STUBS__
-	__set_errno(ENOSYS);
-	return -1;
 #endif
 }
 #endif
diff --git a/libc/sysdeps/linux/common/splice.c b/libc/sysdeps/linux/common/splice.c
index b21d10336..83f348a48 100644
--- a/libc/sysdeps/linux/common/splice.c
+++ b/libc/sysdeps/linux/common/splice.c
@@ -13,11 +13,4 @@
 #ifdef __NR_splice
 _syscall6(ssize_t, splice, int, __fdin, __off64_t *, __offin, int, __fdout,
 	__off64_t *, __offout, size_t, __len, unsigned int, __flags)
-#else
-ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
-	__off64_t *__offout, size_t __len, unsigned int __flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/stubs.c b/libc/sysdeps/linux/common/stubs.c
new file mode 100644
index 000000000..dd4a384f8
--- /dev/null
+++ b/libc/sysdeps/linux/common/stubs.c
@@ -0,0 +1,183 @@
+/*
+ * system call not available stub
+ *
+ * Copyright (C) 2009 Analog Devices Inc.
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <sys/syscall.h>
+
+#ifdef __UCLIBC_HAS_STUBS__
+
+attribute_hidden int enosys_stub(void);
+libc_hidden_proto(enosys_stub)
+
+attribute_hidden int enosys_stub(void)
+{
+	__set_errno(ENOSYS);
+	return -1;
+}
+libc_hidden_def(enosys_stub)
+
+#define make_stub(stub) \
+	link_warning(stub, #stub ": this function is not implemented") \
+	strong_alias(enosys_stub, stub)
+
+#ifndef __ARCH_USE_MMU__
+# undef __NR_fork
+#endif
+
+#ifndef __UCLIBC_HAS_LFS__
+# undef __NR_fadvise64
+# undef __NR_fadvise64_64
+# undef __NR_sync_file_range
+#endif
+
+#ifndef __NR_bdflush
+make_stub(bdflush)
+#endif
+
+#ifndef __NR_capget
+make_stub(capget)
+#endif
+
+#ifndef __NR_capset
+make_stub(capset)
+#endif
+
+#ifndef __NR_create_module
+make_stub(create_module)
+#endif
+
+#ifndef __NR_delete_module
+make_stub(delete_module)
+#endif
+
+#ifndef __NR_epoll_create
+make_stub(epoll_create)
+#endif
+
+#ifndef __NR_epoll_ctl
+make_stub(epoll_ctl)
+#endif
+
+#ifndef __NR_epoll_wait
+make_stub(epoll_wait)
+#endif
+
+#ifndef __NR_fdatasync
+make_stub(fdatasync)
+#endif
+
+#ifndef __NR_flistxattr
+make_stub(flistxattr)
+#endif
+
+#ifndef __NR_fork
+make_stub(fork)
+#endif
+
+#ifndef __NR_fgetxattr
+make_stub(fgetxattr)
+#endif
+
+#ifndef __NR_fremovexattr
+make_stub(fremovexattr)
+#endif
+
+#ifndef __NR_fsetxattr
+make_stub(fsetxattr)
+#endif
+
+#ifndef __NR_get_kernel_syms
+make_stub(get_kernel_syms)
+#endif
+
+#if !defined(__NR_getpgrp) && (defined(__NR_getpgid) && (defined(__NR_getpid) || defined(__NR_getxpid)))
+make_stub(getpgrp)
+#endif
+
+#ifndef __NR_getxattr
+make_stub(getxattr)
+#endif
+
+#ifndef __NR_init_module
+make_stub(init_module)
+#endif
+
+#ifndef __NR_lgetxattr
+make_stub(lgetxattr)
+#endif
+
+#ifndef __NR_listxattr
+make_stub(listxattr)
+#endif
+
+#ifndef __NR_llistxattr
+make_stub(llistxattr)
+#endif
+
+#ifndef __NR_lremovexattr
+make_stub(lremovexattr)
+#endif
+
+#ifndef __NR_lsetxattr
+make_stub(lsetxattr)
+#endif
+
+#ifndef __NR_pivot_root
+make_stub(pivot_root)
+#endif
+
+#ifndef __NR_query_module
+make_stub(query_module)
+#endif
+
+#ifndef __NR_removexattr
+make_stub(removexattr)
+#endif
+
+#ifndef __NR_sched_getaffinity
+make_stub(sched_getaffinity)
+#endif
+
+#ifndef __NR_sched_setaffinity
+make_stub(sched_setaffinity)
+#endif
+
+#ifndef __NR_setxattr
+make_stub(setxattr)
+#endif
+
+#if !defined(__NR_signalfd4) && !defined(__NR_signalfd)
+make_stub(signalfd)
+#endif
+
+#ifndef __NR_rt_sigtimedwait
+make_stub(sigtimedwait)
+make_stub(sigwaitinfo)
+#endif
+
+#ifndef __NR_splice
+make_stub(splice)
+#endif
+
+#ifndef __NR_sync_file_range
+make_stub(sync_file_range)
+#endif
+
+#if !defined(__NR_umount) && !defined(__NR_umount2)
+make_stub(umount)
+#endif
+
+#ifndef __NR_umount2
+make_stub(umount2)
+#endif
+
+#ifndef __NR_vmsplice
+make_stub(vmsplice)
+#endif
+
+#endif
diff --git a/libc/sysdeps/linux/common/sync_file_range.c b/libc/sysdeps/linux/common/sync_file_range.c
index 7e2deff41..d24403e1b 100644
--- a/libc/sysdeps/linux/common/sync_file_range.c
+++ b/libc/sysdeps/linux/common/sync_file_range.c
@@ -23,11 +23,5 @@ int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags)
 		__LONG_LONG_PAIR((long)(nbytes >> 32), (long)(nbytes & 0xffffffff)),
 		flags);
 }
-#elif defined __UCLIBC_HAS_STUBS__
-int sync_file_range(int fd, __off64_t offset, __off64_t nbytes, unsigned int flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
 #endif
diff --git a/libc/sysdeps/linux/common/umount.c b/libc/sysdeps/linux/common/umount.c
index 453ecd27b..a084d29bd 100644
--- a/libc/sysdeps/linux/common/umount.c
+++ b/libc/sysdeps/linux/common/umount.c
@@ -28,14 +28,5 @@ int umount(const char *special_file)
 	return (__syscall_umount2(special_file, 0));
 }
 
-/* arch doesn't provide any umount syscall !? */
-#else
-
-int umount(const char *special_file)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
-
 #endif
 #endif
diff --git a/libc/sysdeps/linux/common/umount2.c b/libc/sysdeps/linux/common/umount2.c
index bd44717d4..2cc4a2338 100644
--- a/libc/sysdeps/linux/common/umount2.c
+++ b/libc/sysdeps/linux/common/umount2.c
@@ -13,11 +13,5 @@
 #include <sys/mount.h>
 #ifdef __NR_umount2	/* Old kernels don't have umount2 */
 _syscall2(int, umount2, const char *, special_file, int, flags)
-#else
-int umount2(const char *special_file, int flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
 #endif
diff --git a/libc/sysdeps/linux/common/vmsplice.c b/libc/sysdeps/linux/common/vmsplice.c
index c5fd6c7ed..dd0640e1e 100644
--- a/libc/sysdeps/linux/common/vmsplice.c
+++ b/libc/sysdeps/linux/common/vmsplice.c
@@ -13,11 +13,4 @@
 #ifdef __NR_vmsplice
 _syscall4(ssize_t, vmsplice, int, __fdout, const struct iovec *, __iov,
 	size_t, __count, unsigned int, __flags)
-#else
-ssize_t vmsplice(int __fdout, const struct iovec *__iov, size_t __count,
-	unsigned int __flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/common/xattr.c b/libc/sysdeps/linux/common/xattr.c
index 8a4e3be29..dea471ad6 100644
--- a/libc/sysdeps/linux/common/xattr.c
+++ b/libc/sysdeps/linux/common/xattr.c
@@ -29,136 +29,58 @@
 #ifdef __NR_setxattr
 _syscall5(int, setxattr, const char *, path, const char *, name,
 	const void *, value, size_t, size, int, flags)
-#else
-int setxattr(__const char *__path, __const char *__name,
-	__const void *__value, size_t __size, int __flags)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_lsetxattr
 _syscall5(int, lsetxattr, const char *, path, const char *, name,
 	const void *, value, size_t, size, int, flags)
-#else
-int lsetxattr(__const char *__path, __const char *__name,
-	__const void *__value, size_t __size, int __flags)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_fsetxattr
 _syscall5(int, fsetxattr, int, filedes, const char *, name, const void *,
 	value, size_t, size, int, flags)
-#else
-int fsetxattr(int __fd, __const char *__name, __const void *__value,
-	size_t __size, int __flags)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 /* gets */
 #ifdef __NR_getxattr
 _syscall4(ssize_t, getxattr, const char *, path, const char *, name,
 	void *, value, size_t, size)
-#else
-ssize_t getxattr(__const char *__path, __const char *__name, void *__value,
-	size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_lgetxattr
 _syscall4(ssize_t, lgetxattr, const char *, path, const char *, name,
 	void *, value, size_t, size)
-#else
-ssize_t lgetxattr(__const char *__path, __const char *__name,
-	void *__value, size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_fgetxattr
 _syscall4(ssize_t, fgetxattr, int, filedes, const char *, name, void *,
 	value, size_t, size)
-#else
-ssize_t fgetxattr(int __fd, __const char *__name, void *__value,
-	size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 /* list */
 #ifdef __NR_listxattr
 _syscall3(ssize_t, listxattr, const char *, path, char *, list, size_t,
 	size)
-#else
-ssize_t listxattr(__const char *__path, char *__list, size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_llistxattr
 _syscall3(ssize_t, llistxattr, const char *, path, char *, list, size_t,
 	size)
-#else
-ssize_t llistxattr(__const char *__path, char *__list, size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_flistxattr
 _syscall3(ssize_t, flistxattr, int, filedes, char *, list, size_t, size)
-#else
-ssize_t flistxattr(int __fd, char *__list, size_t __size)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 /* remove */
 #ifdef __NR_removexattr
 _syscall2(int, removexattr, const char *, path, const char *, name)
-#else
-int removexattr(__const char *__path, __const char *__name)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_lremovexattr
 _syscall2(int, lremovexattr, const char *, path, const char *, name)
-#else
-int lremovexattr(__const char *__path, __const char *__name)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
 
 #ifdef __NR_fremovexattr
 _syscall2(int, fremovexattr, int, filedes, const char *, name)
-#else
-int fremovexattr(int __fd, __const char *__name)
-{
-    __set_errno(ENOSYS);
-    return -1;
-}
 #endif
diff --git a/libc/sysdeps/linux/i386/posix_fadvise64.S b/libc/sysdeps/linux/i386/posix_fadvise64.S
index 17f006aa8..b4aeff1f4 100644
--- a/libc/sysdeps/linux/i386/posix_fadvise64.S
+++ b/libc/sysdeps/linux/i386/posix_fadvise64.S
@@ -22,6 +22,8 @@
 #include <bits/errno.h>
 #include <sys/syscall.h>
 
+#if defined __NR_fadvise64_64
+
 /* Was named __libc_posix_fadvise64 for some inexplicable reason.
 ** google says only uclibc has *__libc*_posix_fadviseXXX,
 ** so it cannot be compat with anything.
@@ -33,7 +35,6 @@
 .global posix_fadvise64
 .type   posix_fadvise64,%function
 posix_fadvise64:
-#if defined __NR_fadvise64_64
 	/* Save regs  */
 	pushl	%ebp
 	pushl	%ebx
@@ -91,10 +92,6 @@ overflow:
 	/* Returns 0 on success, else an error code.  */
 	negl	%eax
 
-#elif defined __UCLIBC_HAS_STUBS__
-	movl	$-ENOSYS, %eax
-	jmp __syscall_error
-#endif
 	/* Successful; return the syscall's value.  */
 	ret
 
@@ -106,3 +103,5 @@ overflow:
 ** weak_alias(__libc_posix_fadvise64,posix_fadvise64)
 ** #endif
 */
+
+#endif