Re: [PATCH] Re: export of sys_call_table

From: Brian F. G. Bidulock (bidulock@openss7.org)
Date: Tue Oct 08 2002 - 19:21:19 EST


David,

On Tue, 08 Oct 2002, David S. Miller wrote:

> Oh really?

Many apologies. Of course it is the wrong patch...
(My excuse: Finger trouble late in the day.)

Here is the correct patch:

--- arch/i386/kernel/entry.S.orig 2002-08-02 19:39:42.000000000 -0500
+++ arch/i386/kernel/entry.S 2002-10-08 15:43:08.000000000 -0500
@@ -584,8 +584,8 @@
         .long SYMBOL_NAME(sys_capset) /* 185 */
         .long SYMBOL_NAME(sys_sigaltstack)
         .long SYMBOL_NAME(sys_sendfile)
- .long SYMBOL_NAME(sys_ni_syscall) /* streams1 */
- .long SYMBOL_NAME(sys_ni_syscall) /* streams2 */
+ .long SYMBOL_NAME(sys_getpmsg) /* streams1 */
+ .long SYMBOL_NAME(sys_putpmsg) /* streams2 */
         .long SYMBOL_NAME(sys_vfork) /* 190 */
         .long SYMBOL_NAME(sys_getrlimit)
         .long SYMBOL_NAME(sys_mmap2)
--- kernel/ksyms.c.orig 2002-08-02 19:39:46.000000000 -0500
+++ kernel/ksyms.c 2002-10-08 15:44:37.000000000 -0500
@@ -497,6 +497,11 @@
 EXPORT_SYMBOL(seq_release);
 EXPORT_SYMBOL(seq_read);
 EXPORT_SYMBOL(seq_lseek);
+extern void register_streams_calls(int (*putpmsg) (int,void *,void *,int,int),
+ int (*getpmsg) (int,void *,void *,int,int));
+extern void unregister_streams_calls(void);
+EXPORT_SYMBOL(register_streams_calls);
+EXPORT_SYMBOL(unregister_streams_calls);
 
 /* Program loader interfaces */
 EXPORT_SYMBOL(setup_arg_pages);
--- kernel/sys.c.orig 2002-08-02 19:39:46.000000000 -0500
+++ kernel/sys.c 2002-10-08 16:46:55.000000000 -0500
@@ -167,6 +167,45 @@
         return notifier_chain_unregister(&reboot_notifier_list, nb);
 }
 
+static int (*do_putpmsg) (int, void *, void *, int, int) = NULL;
+static int (*do_getpmsg) (int, void *, void *, int, int) = NULL;
+
+static DECLARE_RWSEM(streams_call_sem) ;
+
+long asmlinkage sys_putpmsg(int fd, void *ctlptr, void *datptr, int band, int flags)
+{
+ int ret = -ENOSYS;
+ down_read(&streams_call_sem);
+ if (do_putpmsg)
+ ret = (*do_putpmsg) (fd, ctlptr, datptr, band, flags);
+ up_read(&streams_call_sem);
+ return ret;
+}
+
+long asmlinkage sys_getpmsg(int fd, void *ctlptr, void *datptr, int band, int flags)
+{
+ int ret = -ENOSYS;
+ down_read(&streams_call_sem);
+ if (do_getpmsg)
+ ret = (*do_getpmsg) (fd, ctlptr, datptr, band, flags);
+ up_read(&streams_call_sem);
+ return ret;
+}
+
+void register_streams_calls(int (*putpmsg) (int, void *, void *, int, int),
+ int (*getpmsg) (int, void *, void *, int, int))
+{
+ down_write(&streams_call_sem);
+ do_putpmsg = putpmsg;
+ do_getpmsg = getpmsg;
+ up_write(&streams_call_sem);
+}
+
+void unregister_streams_calls(void)
+{
+ register_streams_calls(NULL, NULL);
+}
+
 asmlinkage long sys_ni_syscall(void)
 {
         return -ENOSYS;

-- 
Brian F. G. Bidulock     The reasonable man adapts himself to the 
bidulock@openss7.org     world; the unreasonable one persists in  
http://www.openss7.org/  trying  to adapt the  world  to himself. 
                         Therefore  all  progress  depends on the 
                         unreasonable man. -- George Bernard Shaw 
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