diff options
Diffstat (limited to 'arch/um/os-Linux/file.c')
| -rw-r--r-- | arch/um/os-Linux/file.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c index fbda10535dab..26ecbd64c409 100644 --- a/arch/um/os-Linux/file.c +++ b/arch/um/os-Linux/file.c @@ -5,9 +5,11 @@ #include <stdio.h> #include <unistd.h> +#include <stdlib.h> #include <errno.h> #include <fcntl.h> #include <signal.h> +#include <linux/falloc.h> #include <sys/ioctl.h> #include <sys/mount.h> #include <sys/socket.h> @@ -16,6 +18,7 @@ #include <sys/un.h> #include <sys/types.h> #include <sys/eventfd.h> +#include <poll.h> #include <os.h> static void copy_stat(struct uml_stat *dst, const struct stat64 *src) @@ -664,3 +667,31 @@ int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds, return -errno; return err; } + +int os_poll(unsigned int n, const int *fds) +{ + /* currently need 2 FDs at most so avoid dynamic allocation */ + struct pollfd pollfds[2] = {}; + unsigned int i; + int ret; + + if (n > ARRAY_SIZE(pollfds)) + return -EINVAL; + + for (i = 0; i < n; i++) { + pollfds[i].fd = fds[i]; + pollfds[i].events = POLLIN; + } + + ret = poll(pollfds, n, -1); + if (ret < 0) + return -errno; + + /* Return the index of the available FD */ + for (i = 0; i < n; i++) { + if (pollfds[i].revents) + return i; + } + + return -EIO; +} |