DPDK: Data Plane Development Kit

18.02.0-rc0
rte_cfgfile.h File Reference
#include <stddef.h>

Go to the source code of this file.

Data Structures

struct  rte_cfgfile_entry
struct  rte_cfgfile_parameters

Macros

#define CFG_DEFAULT_COMMENT_CHARACTER   ';'

Enumerations

enum  { CFG_FLAG_GLOBAL_SECTION = 1, CFG_FLAG_EMPTY_VALUES = 2 }

Functions

struct rte_cfgfile * rte_cfgfile_load (const char *filename, int flags)
struct rte_cfgfile * rte_cfgfile_load_with_params (const char *filename, int flags, const struct rte_cfgfile_parameters *params)
struct rte_cfgfile * rte_cfgfile_create (int flags)
int rte_cfgfile_add_section (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_add_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname, const char *entryvalue)
int rte_cfgfile_set_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname, const char *entryvalue)
int rte_cfgfile_save (struct rte_cfgfile *cfg, const char *filename)
int rte_cfgfile_num_sections (struct rte_cfgfile *cfg, const char *sec_name, size_t length)
int rte_cfgfile_sections (struct rte_cfgfile *cfg, char *sections[], int max_sections)
int rte_cfgfile_has_section (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_section_num_entries (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_section_num_entries_by_index (struct rte_cfgfile *cfg, char *sectionname, int index)
int rte_cfgfile_section_entries (struct rte_cfgfile *cfg, const char *sectionname, struct rte_cfgfile_entry *entries, int max_entries)
int rte_cfgfile_section_entries_by_index (struct rte_cfgfile *cfg, int index, char *sectionname, struct rte_cfgfile_entry *entries, int max_entries)
const char * rte_cfgfile_get_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname)
int rte_cfgfile_has_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname)
int rte_cfgfile_close (struct rte_cfgfile *cfg)

Detailed Description

RTE Configuration File

This library allows reading application defined parameters from standard format configuration file.

Definition in file rte_cfgfile.h.

Macro Definition Documentation

#define CFG_DEFAULT_COMMENT_CHARACTER   ';'

Defines the default comment character used for parsing config files.

Definition at line 93 of file rte_cfgfile.h.

Enumeration Type Documentation

anonymous enum

cfgfile load operation flags

Enumerator:
CFG_FLAG_GLOBAL_SECTION 

Indicates that the file supports key value entries before the first defined section. These entries can be accessed in the "GLOBAL" section.

CFG_FLAG_EMPTY_VALUES 

Indicates that file supports key value entries where the value can be zero length (e.g., "key=").

Definition at line 76 of file rte_cfgfile.h.

Function Documentation

struct rte_cfgfile* rte_cfgfile_load ( const char *  filename,
int  flags 
)
read

Open config file

Parameters
filenameConfig file name
flagsConfig file flags
Returns
Handle to configuration file on success, NULL otherwise
Examples:
examples/ip_pipeline/config_parse.c, examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/init.c.
struct rte_cfgfile* rte_cfgfile_load_with_params ( const char *  filename,
int  flags,
const struct rte_cfgfile_parameters params 
)
read

Open config file with specified optional parameters.

Parameters
filenameConfig file name
flagsConfig file flags
paramsAdditional configuration attributes. Must be configured with desired values prior to invoking this API.
Returns
Handle to configuration file on success, NULL otherwise
struct rte_cfgfile* rte_cfgfile_create ( int  flags)
read

Create new cfgfile instance with empty sections and entries

Parameters
flags
  • CFG_FLAG_GLOBAL_SECTION Indicates that the file supports key value entries before the first defined section. These entries can be accessed in the "GLOBAL" section.
  • CFG_FLAG_EMPTY_VALUES Indicates that file supports key value entries where the value can be zero length (e.g., "key=").
Returns
Handle to cfgfile instance on success, NULL otherwise
int rte_cfgfile_add_section ( struct rte_cfgfile *  cfg,
const char *  sectionname 
)

Add section in cfgfile instance.

Parameters
cfgPointer to the cfgfile structure.
sectionnameSection name which will be add to cfgfile.
Returns
0 on success, -ENOMEM if can't add section
int rte_cfgfile_add_entry ( struct rte_cfgfile *  cfg,
const char *  sectionname,
const char *  entryname,
const char *  entryvalue 
)

Add entry to specified section in cfgfile instance.

Parameters
cfgPointer to the cfgfile structure.
sectionnameGiven section name to add an entry.
entrynameEntry name to add.
entryvalueEntry value to add.
Returns
0 on success, -EEXIST if entry already exist, -EINVAL if bad argument
int rte_cfgfile_set_entry ( struct rte_cfgfile *  cfg,
const char *  sectionname,
const char *  entryname,
const char *  entryvalue 
)

Update value of specified entry name in given section in config file

Parameters
cfgConfig file
sectionnameSection name
entrynameEntry name to look for the value change
entryvalueNew entry value. Can be also an empty string if CFG_FLAG_EMPTY_VALUES = 1
Returns
0 on success, -EINVAL if bad argument
int rte_cfgfile_save ( struct rte_cfgfile *  cfg,
const char *  filename 
)

Save object cfgfile to file on disc

Parameters
cfgConfig file structure
filenameFile name to save data
Returns
0 on success, errno otherwise
int rte_cfgfile_num_sections ( struct rte_cfgfile *  cfg,
const char *  sec_name,
size_t  length 
)

Get number of sections in config file

Parameters
cfgConfig file
sec_nameSection name
lengthMaximum section name length
Returns
Number of sections
Examples:
examples/ip_pipeline/config_parse.c, examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/cfg_file.c.
int rte_cfgfile_sections ( struct rte_cfgfile *  cfg,
char *  sections[],
int  max_sections 
)

Get name of all config file sections.

Fills in the array sections with the name of all the sections in the file (up to the number of max_sections sections).

Parameters
cfgConfig file
sectionsArray containing section names after successful invocation. Each element of this array should be preallocated by the user with at least CFG_NAME_LEN characters.
max_sectionsMaximum number of section names to be stored in sections array
Returns
Number of populated sections names
Examples:
examples/ip_pipeline/config_parse.c.
int rte_cfgfile_has_section ( struct rte_cfgfile *  cfg,
const char *  sectionname 
)

Check if given section exists in config file

Parameters
cfgConfig file
sectionnameSection name
Returns
TRUE (value different than 0) if section exists, FALSE (value 0) otherwise
Examples:
examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/cfg_file.c.
int rte_cfgfile_section_num_entries ( struct rte_cfgfile *  cfg,
const char *  sectionname 
)

Get number of entries in given config file section

If multiple sections have the given name this function operates on the first one.

Parameters
cfgConfig file
sectionnameSection name
Returns
Number of entries in section on success, -1 otherwise
Examples:
examples/ip_pipeline/config_parse.c, examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/cfg_file.c.
int rte_cfgfile_section_num_entries_by_index ( struct rte_cfgfile *  cfg,
char *  sectionname,
int  index 
)

Get number of entries in given config file section

The index of a section is the same as the index of its name in the result of rte_cfgfile_sections. This API can be used when there are multiple sections with the same name.

Parameters
cfgConfig file
sectionnameSection name
indexSection index
Returns
Number of entries in section on success, -1 otherwise
int rte_cfgfile_section_entries ( struct rte_cfgfile *  cfg,
const char *  sectionname,
struct rte_cfgfile_entry entries,
int  max_entries 
)

Get section entries as key-value pairs

If multiple sections have the given name this function operates on the first one.

Parameters
cfgConfig file
sectionnameSection name
entriesPre-allocated array of at least max_entries entries where the section entries are stored as key-value pair after successful invocation
max_entriesMaximum number of section entries to be stored in entries array
Returns
Number of entries populated on success, -1 otherwise
Examples:
examples/ip_pipeline/config_parse.c, examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/cfg_file.c.
int rte_cfgfile_section_entries_by_index ( struct rte_cfgfile *  cfg,
int  index,
char *  sectionname,
struct rte_cfgfile_entry entries,
int  max_entries 
)

Get section entries as key-value pairs

The index of a section is the same as the index of its name in the result of rte_cfgfile_sections. This API can be used when there are multiple sections with the same name.

Parameters
cfgConfig file
indexSection index
sectionnamePre-allocated string of at least CFG_NAME_LEN characters where the section name is stored after successful invocation.
entriesPre-allocated array of at least max_entries entries where the section entries are stored as key-value pair after successful invocation
max_entriesMaximum number of section entries to be stored in entries array
Returns
Number of entries populated on success, -1 otherwise
const char* rte_cfgfile_get_entry ( struct rte_cfgfile *  cfg,
const char *  sectionname,
const char *  entryname 
)

Get value of the named entry in named config file section

If multiple sections have the given name this function operates on the first one.

Parameters
cfgConfig file
sectionnameSection name
entrynameEntry name
Returns
Entry value on success, NULL otherwise
Examples:
examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/cfg_file.c.
int rte_cfgfile_has_entry ( struct rte_cfgfile *  cfg,
const char *  sectionname,
const char *  entryname 
)

Check if given entry exists in named config file section

If multiple sections have the given name this function operates on the first one.

Parameters
cfgConfig file
sectionnameSection name
entrynameEntry name
Returns
TRUE (value different than 0) if entry exists, FALSE (value 0) otherwise
int rte_cfgfile_close ( struct rte_cfgfile *  cfg)

Close config file

Parameters
cfgConfig file
Returns
0 on success, -1 otherwise
Examples:
examples/ip_pipeline/config_parse.c, examples/ip_pipeline/config_parse_tm.c, and examples/qos_sched/init.c.