NPROBE (2)
Report if a LAM bufferd network message is ready to be received.
C SYNOPSIS
#include <net.h>
int nprobe (struct nmsg *header);
FORTRAN SYNOPSIS
subroutine NPROB (nevent, ntype, nlength, nflags, nready, ierror)
integer nevent, ntype, nlength, nflags, nready, ierror
DESCRIPTION
If a synchronizing message exists, information about its type, length,
and flags is returned.
The
nprobe()
function accepts a pointer to a network message descriptor, defined in
<net.h>.
See nsend(2).
Only the
nh_event
and
nh_type
fields of the network message descriptor must be filled before calling
nprobe() .
The
nh_type
and
nh_length
fields are altered after a successful probe as if nrecv(2) had been called.
Since
nprobe()
can only examine buffered messages, it cannot be used when buffers
are bypassed.
C RETURN VALUE
Upon successful completion,
1 is returned if a synchronizing message is waiting to be received, and
0 is returned if no synchronizing message is waiting.
If an error occurred,
-1 is returned and the global variable,
errno
is set to indicate the error.
FORTRAN RETURN VALUE
Upon successful completion, the
nready
argument is set to 1 if a synchronizing message is waiting to be received, and
0 if no synchronizing message is waiting.
SEE ALSO
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