[PATCH] Win32 equivalent to GetTickCount systemcall (i386)

From: David Engraf
Date: Tue Dec 06 2005 - 05:36:09 EST


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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