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[interface] Provide the ability to shut down multiple interfaces

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Shutting down (and optionally restarting) multiple interfaces is
fraught with problems if there are loops in the interface connectivity
(e.g. the HTTP content-decoded and transfer-decoded interfaces, which
will generally loop back to each other).  Various workarounds
currently exist across the codebase, generally involving preceding
calls to intf_nullify() to avoid problems due to known loops.

Provide intfs_shutdown() and intfs_restart() to allow all of an
object's interfaces to be shut down (or restarted) in a single call,
without having to worry about potential external loops.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-02-02 15:49:21 +00:00
parent a8f80a75d2
commit 23b788e5cd
2 changed files with 74 additions and 0 deletions
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5
src/include/ipxe/interface.h
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@@ -10,6 +10,7 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <stdarg.h>
#include <ipxe/refcnt.h>
/** An object interface operation */
@@ -148,7 +149,11 @@ extern void intf_close ( struct interface *intf, int rc );
typeof ( void ( object_type, int rc ) )
extern void intf_shutdown ( struct interface *intf, int rc );
extern void intfs_vshutdown ( va_list intfs, int rc );
extern void intfs_shutdown ( int rc, ... ) __attribute__ (( sentinel ));
extern void intf_restart ( struct interface *intf, int rc );
extern void intfs_vrestart ( va_list intfs, int rc );
extern void intfs_restart ( int rc, ... ) __attribute__ (( sentinel ));
extern void intf_poke ( struct interface *intf,
void ( type ) ( struct interface *intf ) );