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Manual Pages for UNIX Operating System command usage for man curl_easy_getinfo

libcurl Manual curl_easy_getinfo(3)

NAME

curl_easy_getinfo - extract information from a curl handle

SYNOPSIS

#include

CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ... );

DESCRIPTION

Request internal information from the curl session with this function. The third argument MUST be a pointer to a long, a

pointer to a char *, a pointer to a struct curl_slist * or a

pointer to a double (as this documentation describes further

down). The data pointed-to will be filled in accordingly

and can be relied upon only if the function returns

CURLE_OK. Use this function AFTER a performed transfer if

you want to get transfer- oriented data.

You should not free the memory returned by this function unless it is explicitly mentioned below. AVAILABLE INFORMATION The following information can be extracted:

CURLINFO_EFFECTIVE_URL

Pass a pointer to a char pointer to receive the last used effective URL.

CURLINFO_RESPONSE_CODE

Pass a pointer to a long to receive the last received HTTP or FTP code. This option was known as

CURLINFO_HTTP_CODE in libcurl 7.10.7 and earlier. This

will be zero if no server response code has been received. Note that a proxy's CONNECT response should

be read with CURLINFO_HTTP_CONNECTCODE and not this.

CURLINFO_HTTP_CONNECTCODE

Pass a pointer to a long to receive the last received proxy response code to a CONNECT request.

CURLINFO_FILETIME

Pass a pointer to a long to receive the remote time of the retrieved document (in number of seconds since 1

jan 1970 in the GMT/UTC time zone). If you get -1, it

can be because of many reasons (unknown, the server hides it or the server doesn't support the command that tells document time etc) and the time of the document

is unknown. Note that you must tell the server to col-

lect this information before the transfer is made, by

using the CURLOPT_FILETIME option to

curl_easy_setopt(3) or you will unconditionally get a

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libcurl Manual curl_easy_getinfo(3)

-1 back. (Added in 7.5)

CURLINFO_TOTAL_TIME

Pass a pointer to a double to receive the total time in seconds for the previous transfer, including name resolving, TCP connect etc.

CURLINFO_NAMELOOKUP_TIME

Pass a pointer to a double to receive the time, in

seconds, it took from the start until the name resolv-

ing was completed.

CURLINFO_CONNECT_TIME

Pass a pointer to a double to receive the time, in seconds, it took from the start until the connect to the remote host (or proxy) was completed.

CURLINFO_APPCONNECT_TIME

Pass a pointer to a double to receive the time, in

seconds, it took from the start until the SSL/SSH connect/handshake to the remote host was completed. This time is most often very near to the PRETRANSFER time, except for cases such as HTTP pippelining where the pretransfer time can be delayed due to waits in line for the pipeline and more. (Added in 7.19.0)

CURLINFO_PRETRANSFER_TIME

Pass a pointer to a double to receive the time, in seconds, it took from the start until the file transfer

is just about to begin. This includes all pre-transfer

commands and negotiations that are specific to the par-

ticular protocol(s) involved.

CURLINFO_STARTTRANSFER_TIME

Pass a pointer to a double to receive the time, in seconds, it took from the start until the first byte is just about to be transferred. This includes

CURLINFO_PRETRANSFER_TIME and also the time the server

needs to calculate the result.

CURLINFO_REDIRECT_TIME

Pass a pointer to a double to receive the total time, in seconds, it took for all redirection steps include name lookup, connect, pretransfer and transfer before

final transaction was started. CURLINFO_REDIRECT_TIME

contains the complete execution time for multiple redirections. (Added in 7.9.7)

CURLINFO_REDIRECT_COUNT

Pass a pointer to a long to receive the total number of redirections that were actually followed. (Added in 7.9.7) libcurl 7.19.4 Last change: 11 Feb 2009 2

libcurl Manual curl_easy_getinfo(3)

CURLINFO_REDIRECT_URL

Pass a pointer to a char pointer to receive the URL a redirect would take you to if you would enable

CURLOPT_FOLLOWLOCATION. This can come very handy if you

think using the built-in libcurl redirect logic isn't

good enough for you but you would still prefer to avoid implementing all the magic of figuring out the new URL. (Added in 7.18.2)

CURLINFO_SIZE_UPLOAD

Pass a pointer to a double to receive the total amount of bytes that were uploaded.

CURLINFO_SIZE_DOWNLOAD

Pass a pointer to a double to receive the total amount of bytes that were downloaded. The amount is only for the latest transfer and will be reset again for each new transfer.

CURLINFO_SPEED_DOWNLOAD

Pass a pointer to a double to receive the average down-

load speed that curl measured for the complete down-

load. Measured in bytes/second.

CURLINFO_SPEED_UPLOAD

Pass a pointer to a double to receive the average upload speed that curl measured for the complete upload. Measured in bytes/second.

CURLINFO_HEADER_SIZE

Pass a pointer to a long to receive the total size of all the headers received. Measured in number of bytes.

CURLINFO_REQUEST_SIZE

Pass a pointer to a long to receive the total size of the issued requests. This is so far only for HTTP requests. Note that this may be more than one request if FOLLOWLOCATION is true.

CURLINFO_SSL_VERIFYRESULT

Pass a pointer to a long to receive the result of the certification verification that was requested (using

the CURLOPT_SSL_VERIFYPEER option to

curl_easy_setopt(3)).

CURLINFO_SSL_ENGINES

Pass the address of a 'struct curl_slist *' to receive

a linked-list of OpenSSL crypto-engines supported. Note

that engines are normally implemented in separate dynamic libraries. Hence not all the returned engines

may be available at run-time. NOTE: you must call

curl_slist_free_all(3) on the list pointer once you're

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libcurl Manual curl_easy_getinfo(3)

done with it, as libcurl will not free the data for you. (Added in 7.12.3)

CURLINFO_CONTENT_LENGTH_DOWNLOAD

Pass a pointer to a double to receive the content-

length of the download. This is the value read from the

Content-Length: field. Since 7.19.4, this returns -1 if

the size isn't known.

CURLINFO_CONTENT_LENGTH_UPLOAD

Pass a pointer to a double to receive the specified

size of the upload. Since 7.19.4, this returns -1 if

the size isn't known.

CURLINFO_CONTENT_TYPE

Pass a pointer to a char pointer to receive the

content-type of the downloaded object. This is the

value read from the Content-Type: field. If you get

NULL, it means that the server didn't send a valid

Content-Type header or that the protocol used doesn't

support this.

CURLINFO_PRIVATE

Pass a pointer to a char pointer to receive the pointer to the private data associated with the curl handle

(set with the CURLOPT_PRIVATE option to

curl_easy_setopt(3)). Please note that for internal

reasons, the value is returned as a char pointer, although effectively being a 'void *'. (Added in 7.10.3)

CURLINFO_HTTPAUTH_AVAIL

Pass a pointer to a long to receive a bitmask indicat-

ing the authentication method(s) available. The meaning

of the bits is explained in the CURLOPT_HTTPAUTH option

for curl_easy_setopt(3). (Added in 7.10.8)

CURLINFO_PROXYAUTH_AVAIL

Pass a pointer to a long to receive a bitmask indicat-

ing the authentication method(s) available for your proxy authentication. (Added in 7.10.8)

CURLINFO_OS_ERRNO

Pass a pointer to a long to receive the errno variable from a connect failure. Note that the value is only set on failure, it is not reset upon a successfull operation. (Added in 7.12.2)

CURLINFO_NUM_CONNECTS

Pass a pointer to a long to receive how many new con-

nections libcurl had to create to achieve the previous transfer (only the successful connects are counted). libcurl 7.19.4 Last change: 11 Feb 2009 4

libcurl Manual curl_easy_getinfo(3)

Combined with CURLINFO_REDIRECT_COUNT you are able to

know how many times libcurl successfully reused exist-

ing connection(s) or not. See the Connection Options

of curl_easy_setopt(3) to see how libcurl tries to make

persistent connections to save time. (Added in 7.12.3)

CURLINFO_PRIMARY_IP

Pass a pointer to a char pointer to receive the pointer

to a zero-terminated string holding the IP address of

the most recent connection done with this curl handle. This string may be IPv6 if that's enabled. Note that

you get a pointer to a memory area that will be re-used

at next request so you need to copy the string if you want to keep the information. (Added in 7.19.0)

CURLINFO_PRIMARY_PORT

Pass a pointer to a long to receive the destination port of the most recent connection done with this curl handle. (Added in 7.21.0)

CURLINFO_LOCAL_IP

Pass a pointer to a char pointer to receive the pointer

to a zero-terminated string holding the local (source)

IP address of the most recent connection done with this curl handle. This string may be IPv6 if that's enabled.

The same restrictions apply as to CURLINFO_PRIMARY_IP.

(Added in 7.21.0)

CURLINFO_LOCAL_PORT

Pass a pointer to a long to receive the local (source) port of the most recent connection done with this curl handle. (Added in 7.21.0)

CURLINFO_COOKIELIST

Pass a pointer to a 'struct curl_slist *' to receive a

linked-list of all cookies cURL knows (expired ones,

too). Don't forget to curl_slist_free_all(3) the list

after it has been used. If there are no cookies (cook-

ies for the handle have not been enabled or simply none

have been received) 'struct curl_slist *' will be set

to point to NULL. (Added in 7.14.1)

CURLINFO_LASTSOCKET

Pass a pointer to a long to receive the last socket used by this curl session. If the socket is no longer

valid, -1 is returned. When you finish working with the

socket, you must call curl_easy_cleanup() as usual and

let libcurl close the socket and cleanup other resources associated with the handle. This is typically

used in combination with CURLOPT_CONNECT_ONLY. (Added

in 7.15.2) libcurl 7.19.4 Last change: 11 Feb 2009 5

libcurl Manual curl_easy_getinfo(3)

NOTE: this API is not really working on win64, since the SOCKET type on win64 is 64 bit large while its 'long' is only 32 bits.

CURLINFO_FTP_ENTRY_PATH

Pass a pointer to a char pointer to receive a pointer to a string holding the path of the entry path. That is the initial path libcurl ended up in when logging on to the remote FTP server. This stores a NULL as pointer if something is wrong. (Added in 7.15.4)

CURLINFO_CERTINFO

Pass a pointer to a 'struct curl_certinfo *' and you'll

get it set to point to struct that holds a number of linked lists with info about the certificate chain,

assuming you had CURLOPT_CERTINFO enabled when the pre-

vious request was done. The struct reports how many certs it found and then you can extract info for each of those certs by following the linked lists. The info chain is provided in a series of data in the format "name:content" where the content is for the specific named data. See also the certinfo.c example. NOTE: this option is only available in libcurl built with OpenSSL support. (Added in 7.19.1)

CURLINFO_CONDITION_UNMET

Pass a pointer to a long to receive the number 1 if the condition provided in the previous request didn't match

(see CURLOPT_TIMECONDITION). Alas, if this returns a 1

you know that the reason you didn't get data in return is because it didn't fulfill the condition. The long ths argument points to will get a zero stored if the condition instead was met. (Added in 7.19.4)

CURLINFO_RTSP_SESSION_ID

Pass a pointer to a char pointer to receive a pointer to a string holding the most recent RTSP Session ID. Applications wishing to resume an RTSP session on another connection should retreive this info before closing the active connection.

CURLINFO_RTSP_CLIENT_CSEQ

Pass a pointer to a long to receive the next CSeq that will be used by the application.

CURLINFO_RTSP_SERVER_CSEQ

Pass a pointer to a long to receive the next server CSeq that will be expected by the application. (NOTE: listening for server initiated requests is currently unimplemented). libcurl 7.19.4 Last change: 11 Feb 2009 6

libcurl Manual curl_easy_getinfo(3)

Applications wishing to resume an RTSP session on another connection should retreive this info before closing the active connection.

CURLINFO_RTSP_CSEQ_RECV

Pass a pointer to a long to receive the most recently received CSeq from the server. If your application

encounters a CURLE_RTSP_CSEQ_ERROR then you may wish to

troubleshoot and/or fix the CSeq mismatch by peeking at this value. TIMES

An overview of the six time values available from curl_easy_getinfo()

curl_easy_perform()

|

|--NAMELOOKUP

|--|--CONNECT

|--|--|--APPCONNECT

|--|--|--|--PRETRANSFER

|--|--|--|--|--STARTTRANSFER

|--|--|--|--|--|--TOTAL

|--|--|--|--|--|--REDIRECT

NAMELOOKUP

CURLINFO_NAMELOOKUP_TIME. The time it took from the

start until the name resolving was completed. CONNECT

CURLINFO_CONNECT_TIME. The time it took from the start

until the connect to the remote host (or proxy) was completed. APPCONNECT

CURLINFO_APPCONNECT_TIME. The time it took from the

start until the SSL connect/handshake with the remote host was completed. (Added in in 7.19.0) PRETRANSFER

CURLINFO_PRETRANSFER_TIME. The time it took from the

start until the file transfer is just about to begin.

This includes all pre-transfer commands and negotia-

tions that are specific to the particular protocol(s) involved. STARTTRANSFER

CURLINFO_STARTTRANSFER_TIME. The time it took from the

start until the first byte is just about to be transferred. TOTAL

CURLINFO_TOTAL_TIME. Total time of the previous

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libcurl Manual curl_easy_getinfo(3)

request. REDIRECT

CURLINFO_REDIRECT_TIME. The time it took for all

redirection steps include name lookup, connect, pre-

transfer and transfer before final transaction was started. So, this is zero if no redirection took place. RETURN VALUE

If the operation was successful, CURLE_OK is returned. Oth-

erwise an appropriate error code will be returned.

SEE ALSO

curl_easy_setopt(3)

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

_______________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | web/curl |

|____________________|__________________|_

| Interface Stability| Uncommitted |

|____________________|_________________|

NOTES

Source for C-URL is available on http://opensolaris.org.

libcurl 7.19.4 Last change: 11 Feb 2009 8




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