how to check glibc version in linux

Glibc package comes with a bundle of suits and all of them have the same version which glibc library has. ldd  is one of the package that comes with glibc. Hence by checking the version of the ldd we can find the glibc version. Below is the command that is executed on linux rhel 6 64 bit environment and rhel 5.5 32 bit environment.

rhel6 64 bit

rhel 5.5 32 bit

setting cplus_include_path

How to set the CPLUS_INCLUDE_PATH

Additional directories can be added to the include path using the environment variable C_INCLUDE_PATH (for C header files) or CPLUS_INCLUDE_PATH (for C++ header files). For example, the following commands will add ‘/opt/3rd-Apps/include’ to the include path when compiling C programs: 

$ CPLUS_INCLUDE_PATH=/opt/3rd-Apps/include

$ export CPLUS_INCLUDE_PATH

Example:

setting ld_library_path

How to set the LD_LIBRARY_PATH in UNIX/Linux:

Additional directories can be added to the link path using the environment variable LIBRARY_PATH. For example, the following commands will add ‘/opt/my-lib’ to the link path: 

$ LIBRARY_PATH=/opt/3rd-Apps/lib

$ export LIBRARY_PATH

cplus_include_path linux

CPLUS_INCLUDE_PATH in Linux

Additional directories can be added to the include path using the environment variable C_INCLUDE_PATH (for C header files) or CPLUS_INCLUDE_PATH (for C++ header files). For example, the following commands will add ‘/opt/3rd-Apps/include’ to the include path when compiling C programs: 

$ CPLUS_INCLUDE_PATH=/opt/3rd-Apps/include

$ export CPLUS_INCLUDE_PATH

Example:

How to set the CPLUS_INCLUDE_PATH

setting c include path

How to set the C_INCLUDE_PATH

Additional directories can be added to the include path using the environment variable C_INCLUDE_PATH (for C header files) or CPLUS_INCLUDE_PATH (for C++ header files). For example, the following commands will add ‘/opt/3rd-Apps/include’ to the include path when compiling C programs: 

$ C_INCLUDE_PATH=/opt/3rd-Apps/include

$ export C_INCLUDE_PATH

Example:

 

enabling daytime service in linux

configuring daytime service in Linux

starting the daytime service in linux

Steps 1:

open the file "/etc/xinetd.conf"

Step2 :

add the following entry outside the default block

service daytime
{
  disable        = no
  type           = INTERNAL
  id             = daytime-stream
  socket_type    = stream
  protocol       = tcp
  user           = root
  wait           = no
}

Step3 :

restart the xinetd service using  "/etc/init.d.xinetd restart"

Note:

I tested this with RHEL 5.4

See Also:

daytime client c code

Socket Concepts and sample codes

Advance Socket Concepts and sample codes

lsattr command in aix

lsattr command in AIX / Linux

Displays attribute characteristics and possible values of attributes for devices in the system.

Syntax

lsattr {-D[-O]| -E[-O] | -F Format [-Z Character]} -l Name [-a

Attribute]...[-H]

[-f File]

lsattr {-D[-O]| -F Format [-Z Character]}{[-c Class][-s Subclass][-t Type]}

[-a Attribute]... [-H][-f File]

lsattr -R {-l Name | [-c Class][-s Subclass][-t Type]} -a Attribute [-H]

[-f File]

lsattr {-l Name | [-c Class][-s Subclass][-t Type]} -o Operation [...]

-F Format [-Z Character][-f File][-H]

lsattr –h

To find out how much physical memory a system has, you can use the -E and –l flags.

Example : Using lsattr -El

LDAP Error Codes

The possible values for an LDAP error code are shown in the following tables:

Table 1. General return codes
Dec value	Value	Hex value	Brief description	Detailed description
00	LDAP_SUCCESS	00	Success	The request was successful.
00	LDAP_OPERATIONS_ERROR	01	Operations error	An operations error occurred.
02	LDAP_PROTOCOL_ERROR	02	Protocol error	A protocol violation was detected.
03	LDAP_TIMELIMIT_EXCEEDED	03	Time limit exceeded	An LDAP time limit was exceeded.
04	LDAP_SIZELIMIT_EXCEEDED	04	Size limit exceeded	An LDAP size limit was exceeded.
05	LDAP_COMPARE_FALSE	05	Compare false	A compare operation returned false.
06	LDAP_COMPARE_TRUE	06	Compare true	A compare operation returned true.
07	LDAP_STRONG_AUTH_NOT_SUPPORTED	07	Strong authentication not supported	The LDAP server does not support strong authentication.
08	LDAP_STRONG_AUTH_REQUIRED	08	Strong authentication required	Strong authentication is required for the operation.
09	LDAP_PARTIAL_RESULTS	09	Partial results and referral received	Partial results only returned.
10	LDAP_REFERRAL	0A	Referral returned	Referral returned.
11	LDAP_ADMIN_LIMIT_EXCEEDED	0B	Administration limit exceeded	Administration limit exceeded.
12	LDAP_UNAVAILABLE_CRITICAL_EXTENSION	0C	Critical extension not supported	Critical extension is not supported.
13	LDAP_CONFIDENTIALITY_REQUIRED	0D	Confidentiality is required	Confidentiality is required.
14	LDAP_SASLBIND_IN_PROGRESS	0E	SASL bind in progress	An SASL bind is in progress.
16	LDAP_NO_SUCH_ATTRIBUTE	10	No such attribute	The attribute type specified does not exist in the entry.
17	LDAP_UNDEFINED_TYPE	11	Undefined attribute type	The attribute type specified is not valid.
18	LDAP_INAPPROPRIATE_MATCHING	12	Inappropriate matching	Filter type not supported for the specified attribute.
19	LDAP_CONSTRAINT_VIOLATION	13	Constraint violation	An attribute value specified violates some constraint (for example, a postal address has too many lines, or a line that is too long).
20	LDAP_TYPE_OR_VALUE_EXISTS	14	Type or value exists	An attribute type or attribute value specified already exists in the entry.
21	LDAP_INVALID_SYNTAX	15	Invalid syntax	An attribute value that is not valid was specified.
32	LDAP_NO_SUCH_OBJECT	20	No such object	The specified object does not exist in the directory.
33	LDAP_ALIAS_PROBLEM	21	Alias problem	An alias in the directory points to a nonexistent entry.
34	LDAP_INVALID_DN_SYNTAX	22	Invalid DN syntax	A DN that is syntactically not valid was specified.
35	LDAP_IS_LEAF	23	Object is a leaf	The object specified is a leaf.
36	LDAP_ALIAS_DEREF_PROBLEM	24	Alias dereferencing problem	A problem was encountered when dereferencing an alias.
48	LDAP_INAPPROPRIATE_AUTH	30	Inappropriate authentication	Inappropriate authentication was specified (for example, LDAP_AUTH_SIMPLE was specified and the entry does not have a userPassword attribute).
49	LDAP_INVALID_CREDENTIALS	31	Invalid credentials	Invalid credentials were presented (for example, the wrong password).
50	LDAP_INSUFFICIENT_ACCESS	32	Insufficient access	The user has insufficient access to perform the operation.
51	LDAP_BUSY	33	DSA is busy	The DSA is busy.
52	LDAP_UNAVAILABLE	34	DSA is unavailable	The DSA is unavailable.
53	LDAP_UNWILLING_TO_PERFORM	35	DSA is unwilling to perform	The DSA is unwilling to perform the operation.
54	LDAP_LOOP_DETECT	36	Loop detected	A loop was detected.
64	LDAP_NAMING_VIOLATION	40	Naming violation	A naming violation occurred.
65	LDAP_OBJECT_CLASS_VIOLATION	41	Object class violation	An object class violation occurred (for example, a "required" attribute was missing from the entry).
66	LDAP_NOT_ALLOWED_ON_NONLEAF	42	Operation not allowed on nonleaf	The operation is not allowed on a nonleaf object.
67	LDAP_NOT_ALLOWED_ON_RDN	43	Operation not allowed on RDN	The operation is not allowed on an RDN.
68	LDAP_ALREADY_EXISTS	44	Already exists	The entry already exists.
69	LDAP_NO_OBJECT_CLASS_MODS	45	Cannot modify object class	Object class modifications are not allowed.
70	LDAP_RESULTS_TOO_LARGE	46	Results too large	Results too large.
71	LDAP_AFFECTS_MULTIPLE_DSAS	47	Affects multiple DSAs	Affects multiple DSAs.
80	LDAP_OTHER	50	Unknown error	An unknown error occurred.
81	LDAP_SERVER_DOWN	51	Can't contact LDAP server	The LDAP library cannot contact the LDAP server.
82	LDAP_LOCAL_ERROR	52	Local error	Some local error occurred. This is usually a failed memory allocation.
83	LDAP_ENCODING_ERROR	53	Encoding error	An error was encountered encoding parameters to send to the LDAP server.
84	LDAP_DECODING_ERROR	54	Decoding error	An error was encountered decoding a result from the LDAP server.
85	LDAP_TIMEOUT	55	Timed out	A time limit was exceeded while waiting for a result.
86	LDAP_AUTH_UNKNOWN	56	Unknown authentication method	The authentication method specified on a bind operation is not known.
87	LDAP_FILTER_ERROR	57	Bad search filter	An invalid filter was supplied to ldap_search (for example, unbalanced parentheses).
88	LDAP_USER_CANCELLED	58	User cancelled operation	The user cancelled the operation.
89	LDAP_PARAM_ERROR	59	Bad parameter to an LDAP routine	An LDAP routine was called with a bad parameter (for example, a NULL ld pointer, etc.).
90	LDAP_NO_MEMORY	5A	Out of memory	A memory allocation (for example malloc) call failed in an LDAP library routine.
91	LDAP_CONNECT_ERROR	5B	Connection error	Connection error.
92	LDAP_NOT_SUPPORTED	5C	Not supported	Not supported.
93	LDAP_CONTROL_NOT_FOUND	5D	Control not found	Control not found.
94	LDAP_NO_RESULTS_RETURNED	5E	No results returned	No results returned.
95	LDAP_MORE_RESULTS_TO_RETURN	5F	More results to return	More results to return.
96	LDAP_URL_ERR_NOTLDAP	60	URL doesn't begin with ldap://	The URL does not begin with ldap://.
97	LDAP_URL_ERR_NODN	61	URL has no DN (required)	The URL does not have a DN (required).
98	LDAP_URL_ERR_BADSCOPE	62	URL scope string is invalid	The URL scope string is not valid.
99	LDAP_URL_ERR_MEM	63	Can't allocate memory space	Cannot allocate memory space.
100	LDAP_CLIENT_LOOP	64	Client loop	Client loop.
101	LDAP_REFERRAL_LIMIT_EXCEEDED	65	Referral limit exceeded	Referral limit exceeded.
112	LDAP_SSL_ALREADY_INITIALIZED	70	ldap_ssl_client_init successfully called previously in this process	The ldap_ssl_client_init was successfully called previously in this process.
113	LDAP_SSL_INITIALIZE_FAILED	71	Initialization call failed	SSL Initialization call failed.
114	LDAP_SSL_CLIENT_INIT_NOT_CALLED	72	Must call ldap_ssl_client_init before attempting to use SSL connection	Must call ldap_ssl_client_init before attempting to use SSL connection.
115	LDAP_SSL_PARAM_ERROR	73	Invalid SSL parameter previously specified	An SSL parameter that was not valid was previously specified.
116	LDAP_SSL_HANDSHAKE_FAILED	74	Failed to connect to SSL server	Failed to connect to SSL server.
117	LDAP_SSL_GET_CIPHER_FAILED	75	Not used	Deprecated.
118	LDAP_SSL_NOT_AVAILABLE	76	SSL library cannot be located	Ensure that GSKit has been installed.
128	LDAP_NO_EXPLICIT_OWNER	80	No explicit owner found	No explicit owner was found.
129	LDAP_NO_LOCK	81	Could not obtain lock	Client library was not able to lock a required resource.

In addition, the following DNS-related error codes are defined in the ldap.h file:

Table 2. DNS-related return codes
Dec value	Value	Hex value	Detailed description
133	LDAP_DNS_NO_SERVERS	85	No LDAP servers found
134	LDAP_DNS_TRUNCATED	86	Warning: truncated DNS results
135	LDAP_DNS_INVALID_DATA	87	Invalid DNS Data
136	LDAP_DNS_RESOLVE_ERROR	88	Can't resolve system domain or nameserver
137	LDAP_DNS_CONF_FILE_ERROR	89	DNS Configuration file error

The following UTF8-related error codes are defined in the ldap.h file:

Table 3. UTF8-related return codes
Dec value	Value	Hex value	Detailed description
160	LDAP_XLATE_E2BIG	A0	Output buffer overflow
161	LDAP_XLATE_EINVAL	A1	Input buffer truncated
162	LDAP_XLATE_EILSEQ	A2	Unusable input character
163	LDAP_XLATE_NO_ENTRY	A3	No codeset point to map to