CMAP_DEC(3) Corosync Cluster Engine Programmer's Manual CMAP_DEC(3)

NAME

cmap_inc - Decrease already stored value in CMAP

SYNOPSIS

#include <corosync/cmap.h>


cs_error_t cmap_dec (cmap_handle_t handle, const char *key_name);

DESCRIPTION

The cmap_dec function is used to decrease integer value of already
stored key inside cmap. The handle argument is connection to CMAP
database obtained by calling cmap_initialize(3) function. key_name
is name of key to increase value of.

Function is defined only on values where increase makes sense and is
well defined, so it can be one of:

CMAP_VALUETYPE_INT8 - 8-bit signed integer

CMAP_VALUETYPE_UINT8 - 8-bit unsigned integer

CMAP_VALUETYPE_INT16 - 16-bit signed integer

CMAP_VALUETYPE_UINT16 - 16-bit unsigned integer

CMAP_VALUETYPE_INT32 - 32-bit signed integer

CMAP_VALUETYPE_UINT32 - 32-bit unsigned integer

CMAP_VALUETYPE_INT64 - 64-bit signed integer

CMAP_VALUETYPE_UINT64 - 64-bit unsigned integer

Overflow/underflow is not detected and it's ignored.

RETURN VALUE

This call returns the CS_OK value if successful. If value or key_name
are unspecified, CS_ERR_INVALID_PARAM is returned. CS_ERR_NOT_EXIST
error is returned if key doesn't exist (wasn't created by calling
cmap_set(3) first). Some of keys may be tagged read-only directly in
corosync and setting such key will result in CS_ERR_ACCESS error.

SEE ALSO

cmap_get(3), cmap_set(3), cmap_initialize(3), cmap_overview(8)

CS_ERR_TRY_AGAIN Resource temporarily unavailable

CS_ERR_INVALID_PARAM Invalid argument

CS_ERR_ACCESS Permission denied

CS_ERR_LIBRARY The connection failed

CS_ERR_INTERRUPT System call interrupted by a signal

CS_ERR_NOT_SUPPORTED The requested protocol/functionality not
supported

CS_ERR_MESSAGE_ERROR Incorrect auth message received

CS_ERR_NO_MEMORY Not enough memory to complete the requested task

corosync Man Page 03/02/2012 CMAP_DEC(3)