mirror_corosync/man/cmap_get.3.in

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.TH "CMAP_GET" 3 "03/02/2012" "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"

.SH NAME
.P
cmap_get \- Retrieve value from CMAP

.SH SYNOPSIS
.P
\fB#include <corosync/cmap.h>\fR

.P
\fBcs_error_t
cmap_get (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, void *\fIvalue\fB,
size_t *\fIvalue_len\fB, cmap_value_types_t *\fItype\fB);\fR
.P
Also shortcuts for different types are defined
.P
\fBcs_error_t cmap_get_int8 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, int8_t *\fIi8\fB);\fR
.P
\fBcs_error_t cmap_get_uint8 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, uint8_t *\fIu8\fB);\fR
.P
\fBcs_error_t cmap_get_int16 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, int16_t *\fIi16\fB);\fR
.P
\fBcs_error_t cmap_get_uint16 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, uint16_t *\fIu16\fB);\fR
.P
\fBcs_error_t cmap_get_int32 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, int32_t *\fIi32\fB);\fR
.P
\fBcs_error_t cmap_get_uint32 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, uint32_t *\fIu32\fB);\fR
.P
\fBcs_error_t cmap_get_int64 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, int64_t *\fIi64\fB);\fR
.P
\fBcs_error_t cmap_get_uint64 (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, uint64_t *\fIu64\fB);\fR
.P
\fBcs_error_t cmap_get_float (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, float *\fIflt\fB);\fR
.P
\fBcs_error_t cmap_get_double (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, double *\fIdbl\fB);\fR
.P
\fBcs_error_t cmap_get_string (cmap_handle_t \fIhandle\fB, const char *\fIkey_name\fB, char **\fIstr\fB);\fR

.SH DESCRIPTION
.P
The
.B cmap_get
function is used to retrieve key from cmap previously set by
.B cmap_set(3)
function. The
.I handle
argument is connection to CMAP database obtained by calling
.B cmap_initialize(3)
function.
.I key_name
is name of key to get value from.
.I value
is pointer to preallocated data used as storage for data, but can be also NULL, and then only
.I value_len
and/or
.I type
is returned (both of them can also be NULL, allowing function to be used only for test of existence of key).
If
.I value
is not NULL, actual length of value in map is checked against
.I *value_len.
If
.I *value_len
is shorter then length of value in map, error CS_ERR_INVALID_PARAM is returned. After successful copy of
value,
.I *value_len
is set to actual length of value in map. Parameter
.I type
is pointer to memory, where type of value is stored after successful return. Pointer can also be NULL and
then nothing is stored. Type can be one of:
.PP
\fBCMAP_VALUETYPE_INT8\fR - 8-bit signed integer
.PP
\fBCMAP_VALUETYPE_UINT8\fR - 8-bit unsigned integer
.PP
\fBCMAP_VALUETYPE_INT16\fR - 16-bit signed integer
.PP
\fBCMAP_VALUETYPE_UINT16\fR - 16-bit unsigned integer
.PP
\fBCMAP_VALUETYPE_INT32\fR - 32-bit signed integer
.PP
\fBCMAP_VALUETYPE_UINT32\fR - 32-bit unsigned integer
.PP
\fBCMAP_VALUETYPE_INT64\fR - 64-bit signed integer
.PP
\fBCMAP_VALUETYPE_UINT64\fR - 64-bit unsigned integer
.PP
\fBCMAP_VALUETYPE_FLOAT\fR - Float value
.PP
\fBCMAP_VALUETYPE_DOUBLE\fR - Double value
.PP
\fBCMAP_VALUETYPE_STRING\fR - C-style string
.PP
\fBCMAP_VALUETYPE_BINARY\fR - Binary data, byte with zero value has no special meaning

Shortcut functions tests cmap type with it's own type. If type didn't match, CS_ERR_INVALID_PARAM error
is returned. No conversions are done, so for example
.B cmap_get_int16
is not able to return value with
.B CMAP_VALUETYPE_INT8
type.

String shortcut function returns newly allocated memory and caller is responsible for freeing that.

.SH RETURN VALUE
This call returns the CS_OK value if successful. If value or key_name are unspecified, CS_ERR_INVALID_PARAM
is returned. Same error is also returned if
.I value
is specified, and
.I *value_len
is too short for store of data. If key doesn't exists (it was not set by calling
.B cmap_set(3)
function first) CS_ERR_NOT_EXIST error is returned. For helper functions,
CS_ERR_INVALID_PARAM is returned if type stored in cmap doesn't match with type of helper function.

.SH "SEE ALSO"
.BR cmap_set (3),
.BR cmap_initialize (3),
.BR cmap_overview (3)