This patch adds a new systemcall on i386 architectures returning the jiffies
value to the application.
As a kernel developer you can use jiffies but from the user space there is
no equivalent function which counts every millisecond like the Win32
GetTickCount.
linux-2.6.15-rc5-mm1
diff -puN include/asm-i386/unistd_orig.h include/asm-i386/unistd.h
--- include/asm-i386/unistd_orig.h 2005-12-06 12:07:16.000000000 +0100
+++ include/asm-i386/unistd.h 2005-12-06 12:10:07.000000000 +0100
@@ -300,8 +300,9 @@
#define __NR_inotify_add_watch 292
#define __NR_inotify_rm_watch 293
#define __NR_migrate_pages 294
+#define __NR_tickcount 295
-#define NR_syscalls 295
+#define NR_syscalls 296
/*
* user-visible error numbers are in the range -1 - -128: see
diff -puN arch/i386/kernel/syscall_table_orig.S
arch/i386/kernel/syscall_table.S
--- arch/i386/kernel/syscall_table_orig.S 2005-12-06
12:07:14.000000000 +0100
+++ arch/i386/kernel/syscall_table.S 2005-12-06 12:10:40.000000000 +0100
@@ -294,3 +294,4 @@ ENTRY(sys_call_table)
.long sys_inotify_add_watch
.long sys_inotify_rm_watch
.long sys_migrate_pages
+ .long sys_tickcount
diff -puN kernel/sys_orig.c kernel/sys.c
--- kernel/sys_orig.c 2005-12-06 12:06:49.000000000 +0100
+++ kernel/sys.c 2005-12-06 12:08:57.000000000 +0100
@@ -1855,3 +1855,9 @@ asmlinkage long sys_prctl(int option, un
}
return error;
}
+
+asmlinkage long sys_tickcount(long __user *ret)
+{
+ if (copy_to_user(ret, (void*)&jiffies, sizeof(long)))
+ return 0;
+}
Thanks
David Engraf
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