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curl_multi_wait: never return -1 in 'numfds'

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Such a return value isn't documented but could still happen, and the
curl tool code checks for it. It would happen when the underlying
Curl_poll() function returns an error. Starting now we mask that error
as a user of curl_multi_wait() would have no way to handle it anyway.

Reported-by: Jay Satiro
Closes #707
This commit is contained in:
Daniel Stenberg 2016-03-09 10:57:42 +01:00
parent b6665c7a44
commit 77e1726719
1 changed files with 11 additions and 10 deletions
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21
lib/multi.c
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@ -811,6 +811,7 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
unsigned int curlfds;
struct pollfd *ufds = NULL;
long timeout_internal;
int retcode = 0;
if(!GOOD_MULTI_HANDLE(multi))
return CURLM_BAD_HANDLE;
@ -903,18 +904,20 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
}
if(nfds) {
int pollrc;
/* wait... */
infof(data, "Curl_poll(%d ds, %d ms)\n", nfds, timeout_ms);
i = Curl_poll(ufds, nfds, timeout_ms);
pollrc = Curl_poll(ufds, nfds, timeout_ms);
DEBUGF(infof(data, "Curl_poll(%d ds, %d ms) == %d\n",
nfds, timeout_ms, pollrc));
if(i) {
unsigned int j;
if(pollrc > 0) {
retcode = pollrc;
/* copy revents results from the poll to the curl_multi_wait poll
struct, the bit values of the actual underlying poll() implementation
may not be the same as the ones in the public libcurl API! */
for(j = 0; j < extra_nfds; j++) {
for(i = 0; i < extra_nfds; i++) {
unsigned short mask = 0;
unsigned r = ufds[curlfds + j].revents;
unsigned r = ufds[curlfds + i].revents;
if(r & POLLIN)
mask |= CURL_WAIT_POLLIN;
@ -923,16 +926,14 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
if(r & POLLPRI)
mask |= CURL_WAIT_POLLPRI;
extra_fds[j].revents = mask;
extra_fds[i].revents = mask;
}
}
}
else
i = 0;
free(ufds);
if(ret)
*ret = i;
*ret = retcode;
return CURLM_OK;
}