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examples: improve global init, error checks and returning errors

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- add `curl_global_init()` and `curl_global_cleanup()` where missing.
- check the result of `curl_global_init()` where missing.
- return the last curl error from `main()`.
- drop Win32-specific socket initialization in favor of `curl_global_init()`.
- rename some outliers to `res` for curl result code.
- fix cleanup in some error cases.

Inspired by Joshua's report on examples.

Closes #19053
This commit is contained in:
Viktor Szakats 2025-10-13 16:30:18 +02:00
parent 3049c8e0a0
commit 4c7507daf9
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129 changed files with 990 additions and 485 deletions
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58
docs/examples/pop3-multi.c
View file

@ -38,46 +38,50 @@
int main(void)
{
CURLcode res;
CURL *curl;
CURLM *mcurl;
int still_running = 1;
curl_global_init(CURL_GLOBAL_DEFAULT);
res = curl_global_init(CURL_GLOBAL_ALL);
if(res)
return (int)res;
curl = curl_easy_init();
if(!curl)
return 1;
if(curl) {
CURLM *mcurl;
mcurl = curl_multi_init();
if(!mcurl)
return 2;
mcurl = curl_multi_init();
if(mcurl) {
int still_running = 1;
/* Set username and password */
curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
/* Set username and password */
curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
/* This retrieves message 1 from the user's mailbox */
curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
/* This retrieves message 1 from the user's mailbox */
curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
/* Tell the multi stack about our easy handle */
curl_multi_add_handle(mcurl, curl);
/* Tell the multi stack about our easy handle */
curl_multi_add_handle(mcurl, curl);
do {
CURLMcode mc = curl_multi_perform(mcurl, &still_running);
do {
CURLMcode mc = curl_multi_perform(mcurl, &still_running);
if(still_running)
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(mcurl, NULL, 0, 1000, NULL);
if(still_running)
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(mcurl, NULL, 0, 1000, NULL);
if(mc)
break;
if(mc)
break;
} while(still_running);
} while(still_running);
/* Always cleanup */
curl_multi_remove_handle(mcurl, curl);
curl_multi_cleanup(mcurl);
}
curl_easy_cleanup(curl);
}
/* Always cleanup */
curl_multi_remove_handle(mcurl, curl);
curl_multi_cleanup(mcurl);
curl_easy_cleanup(curl);
curl_global_cleanup();
return 0;