syscall: Portability code for epoll_event on GNU/Linux.

[pf3gnuchains/gcc-fork.git] / libgo / Makefile.am

diff --git a/libgo/Makefile.am b/libgo/Makefile.am
index e3b33a8..2a68019 100644 (file)
--- a/libgo/Makefile.am
+++ b/libgo/Makefile.am
@@ -1498,7 +1498,7 @@ endif # !LIBGO_IS_LINUX
 
 # Define socket sizes and types.
 if LIBGO_IS_LINUX
-syscall_socket_file = go/syscall/socket_linux.go
+syscall_socket_file = go/syscall/socket_linux.go epoll.go
 else
 if LIBGO_IS_SOLARIS
 syscall_socket_file = go/syscall/socket_solaris.go
@@ -1582,6 +1582,34 @@ s-sysinfo: $(srcdir)/mksysinfo.sh config.h
        $(SHELL) $(srcdir)/../move-if-change tmp-sysinfo.go sysinfo.go
        $(STAMP) $@
 
+# The epoll struct has an embedded union and is packed on x86_64,
+# which is too complicated for mksysinfo.sh.  We find the offset of
+# the only field we care about in configure.ac, and generate the
+# struct here.
+epoll.go: s-epoll; @true
+s-epoll: Makefile
+       rm -f epoll.go.tmp
+       echo 'package syscall' > epoll.go.tmp
+       echo 'type EpollEvent struct {' >> epoll.go.tmp
+       echo '  Events uint32' >> epoll.go.tmp
+       case "$(SIZEOF_STRUCT_EPOLL_EVENT),$(STRUCT_EPOLL_EVENT_FD_OFFSET)" in \
+       0,0) echo 1>&2 "*** struct epoll_event data.fd offset unknown"; \
+          exit 1; ;; \
+       8,4) echo '     Fd int32' >> epoll.go.tmp; ;; \
+       12,4) echo '    Fd int32' >> epoll.go.tmp; \
+          echo '       Pad [4]byte' >> epoll.go.tmp; ;; \
+       12,8) echo '    Pad [4]byte' >> epoll.go.tmp; \
+          echo '       Fd int32' >> epoll.go.tmp; ;; \
+       16,8) echo '    Pad [4]byte' >> epoll.go.tmp; \
+          echo '       Fd int32' >> epoll.go.tmp; \
+          echo '       Pad2 [4]byte' >> epoll.go.tmp; ;; \
+       *) echo 1>&2 "*** struct epoll_event unsupported"; \
+          exit 1; ;; \
+       esac
+       echo '}' >> epoll.go.tmp
+       $(SHELL) $(srcdir)/../move-if-change epoll.go.tmp epoll.go
+       $(STAMP) $@
+
 if LIBGO_IS_LINUX
 # os_lib_inotify_lo = os/inotify.lo
 os_lib_inotify_lo =