swrite: return error if fd is negative

[collectd.git] / src / daemon / common.c

diff --git a/src/daemon/common.c b/src/daemon/common.c
index f82efe3..4c271d3 100644 (file)
--- a/src/daemon/common.c
+++ b/src/daemon/common.c
@@ -273,6 +273,9 @@ ssize_t swrite (int fd, const void *buf, size_t count)
        ptr   = (const char *) buf;
        nleft = count;
        
+       if (fd < 0)
+               return (-1);
+
        /* checking for closed peer connection */
        pfd.fd = fd;
        pfd.events = POLLIN | POLLHUP;