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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; unsigned int curlfds;
struct pollfd *ufds = NULL; struct pollfd *ufds = NULL;
long timeout_internal; long timeout_internal;
int retcode = 0;
if(!GOOD_MULTI_HANDLE(multi)) if(!GOOD_MULTI_HANDLE(multi))
return CURLM_BAD_HANDLE; return CURLM_BAD_HANDLE;
@ -903,18 +904,20 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
} }
if(nfds) { if(nfds) {
int pollrc;
/* wait... */ /* wait... */
infof(data, "Curl_poll(%d ds, %d ms)\n", nfds, timeout_ms); pollrc = Curl_poll(ufds, nfds, timeout_ms);
i = Curl_poll(ufds, nfds, timeout_ms); DEBUGF(infof(data, "Curl_poll(%d ds, %d ms) == %d\n",
nfds, timeout_ms, pollrc));
if(i) { if(pollrc > 0) {
unsigned int j; retcode = pollrc;
/* copy revents results from the poll to the curl_multi_wait poll /* copy revents results from the poll to the curl_multi_wait poll
struct, the bit values of the actual underlying poll() implementation struct, the bit values of the actual underlying poll() implementation
may not be the same as the ones in the public libcurl API! */ 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 short mask = 0;
unsigned r = ufds[curlfds + j].revents; unsigned r = ufds[curlfds + i].revents;
if(r & POLLIN) if(r & POLLIN)
mask |= CURL_WAIT_POLLIN; mask |= CURL_WAIT_POLLIN;
@ -923,16 +926,14 @@ CURLMcode curl_multi_wait(CURLM *multi_handle,
if(r & POLLPRI) if(r & POLLPRI)
mask |= CURL_WAIT_POLLPRI; mask |= CURL_WAIT_POLLPRI;
extra_fds[j].revents = mask; extra_fds[i].revents = mask;
} }
} }
} }
else
i = 0;
free(ufds); free(ufds);
if(ret) if(ret)
*ret = i; *ret = retcode;
return CURLM_OK; return CURLM_OK;
} }