diff options
Diffstat (limited to 'arch/um/os-Linux/file.c')
| -rw-r--r-- | arch/um/os-Linux/file.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c index f25b110d4e70..5133e3afb96f 100644 --- a/arch/um/os-Linux/file.c +++ b/arch/um/os-Linux/file.c @@ -1,6 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) - * Licensed under the GPL */ #include <stdio.h> @@ -15,6 +15,7 @@ #include <sys/sysmacros.h> #include <sys/un.h> #include <sys/types.h> +#include <sys/eventfd.h> #include <os.h> static void copy_stat(struct uml_stat *dst, const struct stat64 *src) @@ -620,3 +621,46 @@ int os_falloc_punch(int fd, unsigned long long offset, int len) return n; } +int os_eventfd(unsigned int initval, int flags) +{ + int fd = eventfd(initval, flags); + + if (fd < 0) + return -errno; + return fd; +} + +int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds, + unsigned int fds_num) +{ + struct iovec iov = { + .iov_base = (void *) buf, + .iov_len = len, + }; + union { + char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)]; + struct cmsghdr align; + } u; + unsigned int fds_size = sizeof(*fds) * fds_num; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = u.control, + .msg_controllen = CMSG_SPACE(fds_size), + }; + struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); + int err; + + if (fds_num > OS_SENDMSG_MAX_FDS) + return -EINVAL; + memset(u.control, 0, sizeof(u.control)); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(fds_size); + memcpy(CMSG_DATA(cmsg), fds, fds_size); + err = sendmsg(fd, &msg, 0); + + if (err < 0) + return -errno; + return err; +} |