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.TH "CPG_ZCB_ALLOC" 3 "2009-04-15" "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
.SH NAME
cpg_zcb_alloc \- Allocates a zero copy buffer
.SH SYNOPSIS
.B #include <corosync/cpg.h>
.sp
.BI "int cpg_zcb_alloc(cpg_handle_t " handle ", size_t " size ", void **" buffer ");
.SH DESCRIPTION
The
.B cpg_zcb_alloc
function will allocate a zero copy buffer for use with the
.B cpg_zcb_mcast_joined(3)
function.  This buffer should not be used in another thread while a
cpg_zcb_mcast_joined operation is taking place on the buffer.  The buffer is
allocated via operating system mechanisms to avoid copying in the IPC layer.

.PP
The argument
.I handle
describes the handle on which the buffer will be allocated.
.PP
The argument
.I size
requests a buffer of size be allocated.
.PP
The
.I buffer
argument is set to the buffer address that is allocated by this operation.

.SH RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned.
.PP
.SH ERRORS
The errors are undocumented.
.SH "SEE ALSO"
.BR cpg_overview (3),
.BR cpg_initialize (3),
.BR cpg_finalize (3),
.BR cpg_fd_get (3),
.BR cpg_dispatch (3),
.BR cpg_join (3),
.BR cpg_leave (3),
.BR cpg_mcast_joined (3),
.BR cpg_membership_get (3)
.BR cpg_zcb_alloc (3)
.BR cpg_zcb_free (3)
.BR cpg_zcb_mcast_joined (3)
.BR cpg_context_get (3)
.BR cpg_context_set (3)
.BR cpg_local_get (3)

.PP
.PP

.B CS_ERR_TRY_AGAIN
Resource temporarily unavailable

.B CS_ERR_INVALID_PARAM
Invalid argument

.B CS_ERR_ACCESS
Permission denied

.B CS_ERR_LIBRARY
The connection failed

.B CS_ERR_INTERRUPT
System call interrupted by a signal

.B CS_ERR_NOT_SUPPORTED
The requested protocol/functionality not supported

.B CS_ERR_MESSAGE_ERROR
Incorrect auth message received

.B CS_ERR_NO_MEMORY
Not enough memory to complete the requested task