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-rw-r--r--docs/examples/multi-single.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/docs/examples/multi-single.c b/docs/examples/multi-single.c
index 3e236f326..cba4f32cc 100644
--- a/docs/examples/multi-single.c
+++ b/docs/examples/multi-single.c
@@ -51,7 +51,7 @@ int main(int argc, char **argv)
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
- int maxfd;
+ int maxfd = -1;
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
@@ -65,8 +65,10 @@ int main(int argc, char **argv)
curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
/* In a real-world program you OF COURSE check the return code of the
- function calls, *and* you make sure that maxfd is bigger than -1 so
- that the call to select() below makes sense! */
+ function calls. On success, the value of maxfd is guaranteed to be
+ greater or equal than -1. We call select(maxfd + 1, ...), specially in
+ case of (maxfd == -1), we call select(0, ...), which is basically equal
+ to sleep. */
rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);