What is CLONE_IO used for? What is the definition / meaning of I/O
context sharing between parent and child?
In fact, from header file:
#define CLONE_FS 0x00000200 /* set if fs info shared
between processes */
#define CLONE_FILES 0x00000400 /* set if open files shared
between processes */
#define CLONE_IO 0x80000000 /* Clone io context */
These three looked seemingly the same/related.....differences among them?
And in kernel/fork.c:
/*
* Share io context with parent, if CLONE_IO is set
*/
if (clone_flags & CLONE_IO) {
tsk->io_context = ioc_task_link(ioc);
if (unlikely(!tsk->io_context))
return -ENOMEM;
the io_context field is set, why and for what purpose? Thanks.
--
Regards,
Peter Teoh
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