2003-03-26 Roland McGrath <roland@redhat.com>

	* sysdeps/unix/make-syscalls.sh: When an undefined syscall has
	SOURCE=-, append its symbol names to make variable unix-stub-syscalls.
	* sysdeps/unix/Makefile [$(subdir) = misc] [unix-stub-syscalls]
	(sysdep_routines): Add stub-syscalls.
	($(objpfx)stub-syscalls.c): New target.
	(generated): Add stub-syscalls.c.

diff --git a/sysdeps/unix/Makefile b/sysdeps/unix/Makefile
index 18de414..f360013 100644 (file)
--- a/sysdeps/unix/Makefile
+++ b/sysdeps/unix/Makefile
@@ -282,6 +282,36 @@ omit-deps += $(unix-syscalls)
 
 ifeq (misc,$(subdir))
 sysdep_routines += $(unix-extra-syscalls)
+
+ifdef unix-stub-syscalls
+# The system call entry points in this list are supposed to be additional
+# functions not overriding any other sysdeps/.../call.c implementation, but
+# their system call numbers are unavailable in the kernel headers we're
+# using.  Instead of a system call stub, these get a function that fails
+# with ENOSYS.  We just generate a single module defining one function and
+# making all these entry point names aliases for it.
+sysdep_routines += stub-syscalls
+$(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
+                         $(..)sysdeps/unix/Makefile
+       (echo '#include <errno.h>'; \
+        echo 'long int _no_syscall (void)'; \
+        echo '{ __set_errno (ENOSYS); return -1L; }'; \
+        for call in $(unix-stub-syscalls); do \
+          case $$call in \
+          *@@*) ver=$${call##*@}; call=$${call%%*@}; \
+                echo "strong_alias (_no_syscall, $${call}_$${ver})"; \
+                echo "default_symbol_version \
+                        ($${call}_$${ver}, $$call, $$ver);" ;; \
+          *@@*) ver=$${call##*@}; call=$${call%%*@}; \
+                echo "strong_alias (_no_syscall, $${call}_$${ver})"; \
+                echo "symbol_version ($${call}_$${ver}, $$call, $$ver);" ;; \
+          *) echo "weak_alias (_no_syscall, $$call)"; \
+             echo "weak_alias (_no_syscall, __GI_$$call)" ;; \
+          esac; \
+        done) > $@T
+       mv -f $@T $@
+generated += stub-syscalls.c
+endif
 endif
 
 export sysdirs

diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
index 275875e..0c7eab6 100644 (file)
--- a/sysdeps/unix/make-syscalls.sh
+++ b/sysdeps/unix/make-syscalls.sh
@@ -111,6 +111,16 @@ while read file srcfile caller syscall args strong weak; do
   echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
 
  case x$srcfile"$callnum" in
+ x--)
+  # Undefined callnum for an extra syscall.
+  if [ x$caller != x- ]; then
+    if [ x$noerrno != x ]; then
+      echo >&2 "$0: no number for $fileno, no-error syscall ($strong $weak)"
+      exit 2
+    fi
+    echo "unix-stub-syscalls += $strong $weak"
+  fi
+  ;;
  x*-) ;; ### Do nothing for undefined callnum
  x-*)
   echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"