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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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49
docs/examples/websocket.c
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@ -138,31 +138,34 @@ static CURLcode websocket(CURL *curl)
int main(int argc, const char *argv[])
{
CURL *curl;
CURLcode res;
CURLcode res = curl_global_init(CURL_GLOBAL_ALL);
if(res)
return (int)res;
curl = curl_easy_init();
if(!curl) {
return 1; /* memory failure */
if(curl) {
if(argc == 2)
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
else
curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com");
curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */
/* Perform the request, res gets the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
else {
/* connected and ready */
res = websocket(curl);
}
/* always cleanup */
curl_easy_cleanup(curl);
}
if(argc == 2)
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
else
curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com");
curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */
/* Perform the request, res gets the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
else {
/* connected and ready */
res = websocket(curl);
}
/* always cleanup */
curl_easy_cleanup(curl);
curl_global_cleanup();
return (int)res;
}