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curl_multi_wait: avoid second loop if nothing to do

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... hopefully this will also make clang-analyzer stop warning on
potentional NULL dereferences (which were false positives anyway).
This commit is contained in:
Daniel Stenberg 2013-03-09 22:26:07 +01:00
parent 64b2d2d77e
commit 136a3a0ee2
1 changed files with 32 additions and 23 deletions
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11
lib/multi.c
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@ -802,7 +802,8 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
curl_socket_t sockbunch[MAX_SOCKSPEREASYHANDLE];
int bitmap;
unsigned int i;
unsigned int nfds = extra_nfds;
unsigned int nfds = 0;
unsigned int curlfds;
struct pollfd *ufds = NULL;
if(!GOOD_MULTI_HANDLE(multi))
@ -832,6 +833,9 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
easy = easy->next; /* check next handle */
}
curlfds = nfds; /* number of internal file descriptors */
nfds += extra_nfds; /* add the externally provided ones */
if(nfds) {
ufds = malloc(nfds * sizeof(struct pollfd));
if(!ufds)
@ -839,6 +843,10 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
}
nfds = 0;
/* only do the second loop if we found descriptors in the first stage run
above */
if(curlfds) {
/* Add the curl handles to our pollfds first */
easy=multi->easy.next;
while(easy != &multi->easy) {
@ -866,6 +874,7 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
easy = easy->next; /* check next handle */
}
}
/* Add external file descriptions from poll-like struct curl_waitfd */
for(i = 0; i < extra_nfds; i++) {