CDA SC510 Guia do Utilizador descarregar pdf (Página 11)

D2.1.4 IST-033576

• EPERM: One or more of the target processes are not checkpointable

by the current user

• EBADF : The destination (args->cr_fd) is not a valid.

• EINVAL: Some ﬁeld of the args argument is invalid.

• ...

Check errno-base.h for more details.

As the cr_request_checkpoint system call is not a blocking call, a cr_poll_checkpoint

is provided to allow user to check or block for completion.

i n t c r _ p o l l _ c h e c k p o i n t ( c r _ c h e c k p o i n t _ h a n d l e _ t ∗ha n dle ,

s t r u c t t i m e v a l ∗ t i m e o u t ) ;

Return values of this function are the following :

• >0: checkpoint complete

• 0: it’s not done yet and the timeout (if any) has expired

• <0: an error occurred. Returned values are:

• CR_POLL_CHKPT_ERR_PRE: An error was encountered prior to

completion of the poll/wait operation. Most likely errno values in this

case are:

• EINVAL: No checkpoint request associagted with the given han-

dle. This is the EXPECTED value if the caller is included in the

scope of the checkpoint request and is restarting.

• EINTR: Call was interrupted by a signal.

• CR_POLL_CHKPT_ERR_POST: The negative return value CR_POLL_CHKPT_ERR_POST

indicates that the checkpoint request is completed, but has failed. Most

likely errno values in this case are:

• CR_ENOSUPPORT: One or more of the target processes are not

linked (or LD_PRELOADed) with libcr.

• CR_ETEMPFAIL: One or more of the target processes indicated

a temporary inability to perform the requested checkpoint.

• CR_EPERMFAIL: One or more of the target processes indicated

a permanent inability to perform the requested checkpoint.

• ESRCH: All target processes indicated that they should be omit-

ted from the checkpoint.

9/49 XtreemOS–Integrated Project

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CDA SC510 Guia do Utilizador Página 11