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SubjectRe: [Linux-streams] Re: [PATCH] Re: export of sys_call_table
Brian, Petr, et al:

Does this patch address your suggestions? This has been tested on 2.4.19.

Thanks,
Dave

At 01:54 PM 10/9/2002 Wednesday, Brian F. G. Bidulock wrote:
>Petr,
>
>Thanks you for the constructive suggestions. I'll see if we
>can add those in an test it up.
>
>--brian
--- 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 2002-10-10 10:46:43.000000000 -0500
@@ -497,6 +497,11 @@
EXPORT_SYMBOL(seq_release);
EXPORT_SYMBOL(seq_read);
EXPORT_SYMBOL(seq_lseek);
+extern int 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 2002-10-10 10:51:27.000000000 -0500
@@ -167,6 +167,50 @@
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) ; /* should return int, but doesn't */
+ 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) ; /* should return int, but doesn't */
+ if (do_getpmsg)
+ ret = (*do_getpmsg) (fd, ctlptr, datptr, band, flags);
+ up_read(&streams_call_sem);
+ return ret;
+}
+
+int register_streams_calls(int (*putpmsg) (int, void *, void *, int, int),
+ int (*getpmsg) (int, void *, void *, int, int))
+{
+ down_write(&streams_call_sem) ; /* should return int, but doesn't */
+ if ( (putpmsg != NULL && do_putpmsg != NULL)
+ || (getpmsg != NULL && do_getpmsg != NULL)
+ )
+ return -EBUSY;
+ do_putpmsg = putpmsg;
+ do_getpmsg = getpmsg;
+ up_write(&streams_call_sem);
+ return 0 ;
+}
+
+void unregister_streams_calls(void)
+{
+ register_streams_calls(NULL, NULL);
+}
+
asmlinkage long sys_ni_syscall(void)
{
return -ENOSYS;
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