Can I call curl_slist_free_all right after I set CURLOPT_HTTPHEADER?
up vote
3
down vote
favorite
Can I do this?
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
curl_slist_free_all(headerlist);
That is, can I free the header list before I send the request? Does curl make a copy?
c libcurl
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
add a comment |
up vote
3
down vote
favorite
Can I do this?
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
curl_slist_free_all(headerlist);
That is, can I free the header list before I send the request? Does curl make a copy?
c libcurl
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
1
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
1
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37
add a comment |
up vote
3
down vote
favorite
up vote
3
down vote
favorite
Can I do this?
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
curl_slist_free_all(headerlist);
That is, can I free the header list before I send the request? Does curl make a copy?
c libcurl
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
Can I do this?
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
curl_slist_free_all(headerlist);
That is, can I free the header list before I send the request? Does curl make a copy?
c libcurl
c libcurl
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
asked Oct 2 '14 at 22:18
bugloaf
1,49711935
1,49711935
1
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
1
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37
add a comment |
1
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
1
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37
1
1
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
1
1
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37
add a comment |
2 Answers
2
active
oldest
votes
up vote
6
down vote
accepted
No. In the source the setopt function just saves your pointer.
case CURLOPT_HTTPHEADER:
/*
* Set a list with HTTP headers to use (or replace internals with)
*/
data->set.headers = va_arg(param, struct curl_slist *);
break;
answered Oct 2 '14 at 23:14
mukunda
1,998815
add a comment |
up vote
0
down vote
And additionally the list should live during the lifetime of the program, or at least until everything is done with the curl_perform.
answered Nov 11 at 18:08
UtkuBulkan
552
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
6
down vote
accepted
No. In the source the setopt function just saves your pointer.
case CURLOPT_HTTPHEADER:
/*
* Set a list with HTTP headers to use (or replace internals with)
*/
data->set.headers = va_arg(param, struct curl_slist *);
break;
answered Oct 2 '14 at 23:14
mukunda
1,998815
add a comment |
up vote
6
down vote
accepted
No. In the source the setopt function just saves your pointer.
case CURLOPT_HTTPHEADER:
/*
* Set a list with HTTP headers to use (or replace internals with)
*/
data->set.headers = va_arg(param, struct curl_slist *);
break;
answered Oct 2 '14 at 23:14
mukunda
1,998815
add a comment |
up vote
6
down vote
accepted
up vote
6
down vote
accepted
No. In the source the setopt function just saves your pointer.
case CURLOPT_HTTPHEADER:
/*
* Set a list with HTTP headers to use (or replace internals with)
*/
data->set.headers = va_arg(param, struct curl_slist *);
break;
answered Oct 2 '14 at 23:14
mukunda
1,998815
No. In the source the setopt function just saves your pointer.
case CURLOPT_HTTPHEADER:
/*
* Set a list with HTTP headers to use (or replace internals with)
*/
data->set.headers = va_arg(param, struct curl_slist *);
break;
answered Oct 2 '14 at 23:14
mukunda
1,998815
answered Oct 2 '14 at 23:14
mukunda
1,998815
answered Oct 2 '14 at 23:14
mukunda
1,998815
answered Oct 2 '14 at 23:14
mukunda
1,998815
1,998815
add a comment |
add a comment |
up vote
0
down vote
And additionally the list should live during the lifetime of the program, or at least until everything is done with the curl_perform.
answered Nov 11 at 18:08
UtkuBulkan
552
add a comment |
up vote
0
down vote
And additionally the list should live during the lifetime of the program, or at least until everything is done with the curl_perform.
answered Nov 11 at 18:08
UtkuBulkan
552
add a comment |
up vote
0
down vote
up vote
0
down vote
And additionally the list should live during the lifetime of the program, or at least until everything is done with the curl_perform.
answered Nov 11 at 18:08
UtkuBulkan
552
And additionally the list should live during the lifetime of the program, or at least until everything is done with the curl_perform.
answered Nov 11 at 18:08
UtkuBulkan
552
answered Nov 11 at 18:08
UtkuBulkan
552
answered Nov 11 at 18:08
UtkuBulkan
552
answered Nov 11 at 18:08
UtkuBulkan
552
552
add a comment |
add a comment |
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1
Just a note for the future: If you run into a 3rd party binary library and you can't look and see, what you can do is set the option, then overwrite your value with something obvious and then call the operation. If the original value shows up you know it made a copy. If the new value shows up, you know it didn't.
– Zan Lynx
Oct 2 '14 at 23:21
1
This is now also clarified in the CURLOPT_HTTPHEADER man page for future hackers.
– Daniel Stenberg
Oct 3 '14 at 11:37