diff options
Diffstat (limited to 'usr.sbin/vmd/vmm.c')
| -rw-r--r-- | usr.sbin/vmd/vmm.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/usr.sbin/vmd/vmm.c b/usr.sbin/vmd/vmm.c index b863a876ddb..6ca56930e67 100644 --- a/usr.sbin/vmd/vmm.c +++ b/usr.sbin/vmd/vmm.c @@ -1,4 +1,4 @@ -/* $OpenBSD: vmm.c,v 1.31 2016/07/08 06:35:12 mlarkin Exp $ */ +/* $OpenBSD: vmm.c,v 1.32 2016/07/09 09:06:22 stefan Exp $ */ /* * Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org> @@ -37,6 +37,7 @@ #include <fcntl.h> #include <imsg.h> #include <limits.h> +#include <poll.h> #include <pthread.h> #include <stdio.h> #include <stdlib.h> @@ -1761,3 +1762,24 @@ read_mem(paddr_t src, void *buf, size_t len) return (0); } + +/* + * fd_hasdata + * + * Returns 1 if data can be read from an fd, or 0 otherwise. + */ +int +fd_hasdata(int fd) +{ + struct pollfd pfd[1]; + int nready, hasdata = 0; + + pfd[0].fd = fd; + pfd[0].events = POLLIN; + nready = poll(pfd, 1, 0); + if (nready == -1) + log_warn("checking file descriptor for data failed"); + else if (nready == 1 && pfd[0].revents & POLLIN) + hasdata = 1; + return (hasdata); +} |