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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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GPG key ID: B5ABD165E2AEF201
129 changed files with 990 additions and 485 deletions
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15
docs/examples/usercertinmem.c
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@ -157,7 +157,10 @@ static CURLcode sslctx_function(CURL *curl, void *sslctx, void *pointer)
int main(void)
{
CURL *ch;
CURLcode rv;
CURLcode res = curl_global_init(CURL_GLOBAL_ALL);
if(res)
return (int)res;
curl_global_init(CURL_GLOBAL_ALL);
ch = curl_easy_init();
@ -180,8 +183,8 @@ int main(void)
curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");
/* first try: retrieve page without user certificate and key -> fails */
rv = curl_easy_perform(ch);
if(rv == CURLE_OK)
res = curl_easy_perform(ch);
if(res == CURLE_OK)
printf("*** transfer succeeded ***\n");
else
printf("*** transfer failed ***\n");
@ -191,13 +194,13 @@ int main(void)
* "modifications" to the SSL CONTEXT just before link init
*/
curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, sslctx_function);
rv = curl_easy_perform(ch);
if(rv == CURLE_OK)
res = curl_easy_perform(ch);
if(res == CURLE_OK)
printf("*** transfer succeeded ***\n");
else
printf("*** transfer failed ***\n");
curl_easy_cleanup(ch);
curl_global_cleanup();
return (int)rv;
return (int)res;
}