[Xen-changelog] Add a new /proc/xen file called 'capabilities'. Currently, when read in dom0 it will return 'control_d', and be empty when read in a guest. This provides a convenient way to allow the root user to detect whether they're running in a guest or dom0, and e.g. gate whether to start xend. In future, when we add more fine grained capabilities we will add other details into this file.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User iap10@xxxxxxxxxxxxxxxxxxxxx
# Node ID 06c3b8e194d7085693af4af75eea0187be6bf984
# Parent  82f61375cd742d3e944b319f63a7b1e87797c2d6

Add a new /proc/xen file called 'capabilities'. Currently, when read in dom0 it 
will return 'control_d', and be empty when read in a guest. This provides a 
convenient way to allow the root user to detect whether they're running in a 
guest or dom0, and e.g. gate whether to start xend. In future, when we add more 
fine grained capabilities we will add other details into this file.

Signed-off-by: ian@xxxxxxxxxxxxx

diff -r 82f61375cd74 -r 06c3b8e194d7 
linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c
--- a/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c        Thu Dec  1 
01:36:46 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c        Thu Dec  1 
01:43:04 2005
@@ -33,6 +33,7 @@
 #include <asm-xen/xen_proc.h>
 
 static struct proc_dir_entry *privcmd_intf;
+static struct proc_dir_entry *capabilities_intf;
 
 static int privcmd_ioctl(struct inode *inode, struct file *file,
                          unsigned int cmd, unsigned long data)
@@ -234,12 +235,28 @@
        .mmap  = privcmd_mmap,
 };
 
+static int capabilities_read(char *page, char **start, off_t off,
+                        int count, int *eof, void *data)
+{
+       int len = 0;
+       *page = 0;
+
+       if (xen_start_info->flags & SIF_INITDOMAIN)
+               len = sprintf( page, "control_d\n" );
+
+       *eof = 1;
+       return len;
+}
 
 static int __init privcmd_init(void)
 {
        privcmd_intf = create_xen_proc_entry("privcmd", 0400);
        if (privcmd_intf != NULL)
                privcmd_intf->proc_fops = &privcmd_file_ops;
+
+       capabilities_intf = create_xen_proc_entry("capabilities", 0400 );
+       if (capabilities_intf != NULL)
+               capabilities_intf->read_proc = capabilities_read;
 
        return 0;
 }

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