On 06/28/2016 02:59 AM, Dexuan Cui wrote:
The idea here is: IMO the syscalls sys_read()/write() shoudn't return -ENOMEM, so I have to make sure the buffer allocation succeeds? I tried to use kmalloc with __GFP_NOFAIL, but I hit a warning in in mm/page_alloc.c: WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); What error code do you think I should return? EAGAIN, ERESTARTSYS, or something else? May I have your suggestion? Thanks!
What happens as far as errno is concerned when an application makes a read() call against a (say TCP) socket associated with a connection which has been reset? Is it limited to those errno values listed in the read() manpage, or does it end-up getting an errno value from those listed in the recv() manpage? Or, perhaps even one not (presently) listed in either?
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