2 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2014-2018 The strace developers.
6 * SPDX-License-Identifier: GPL-2.0-or-later
15 #include <sys/socket.h>
17 int main(int ac, const char **av)
22 static const char sample[] =
23 "\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff";
24 const unsigned int data_size = sizeof(sample) - 1;
25 void *data = tail_alloc(data_size);
26 memcpy(data, sample, data_size);
28 TAIL_ALLOC_OBJECT_CONST_PTR(struct iovec, iov);
30 iov->iov_len = data_size;
32 TAIL_ALLOC_OBJECT_CONST_PTR(struct msghdr, mh);
33 memset(mh, 0, sizeof(*mh));
38 while ((i = open("/dev/null", O_RDWR)) <= ac + 2)
41 assert(close(i--) == 0);
42 assert(close(0) == 0);
45 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
46 perror_msg_and_skip("socketpair");
48 if (setsockopt(sv[0], SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)))
49 perror_msg_and_skip("setsockopt");
51 assert((fds[0] = open("/dev/null", O_RDWR)) == 4);
52 for (i = 1; i < ac; ++i)
53 assert((fds[i] = open(av[i], O_RDONLY)) == i + 4);
55 unsigned int cmsg_size = CMSG_SPACE(sizeof(fds));
56 struct cmsghdr *cmsg = tail_alloc(cmsg_size);
57 memset(cmsg, 0, cmsg_size);
58 cmsg->cmsg_level = SOL_SOCKET;
59 cmsg->cmsg_type = SCM_RIGHTS;
60 cmsg->cmsg_len = CMSG_LEN(sizeof(fds));
61 memcpy(CMSG_DATA(cmsg), fds, sizeof(fds));
63 mh->msg_control = cmsg;
64 mh->msg_controllen = cmsg_size;
66 assert(sendmsg(sv[1], mh, 0) == (int) data_size);
68 assert(close(sv[1]) == 0);
69 assert(open("/dev/null", O_RDWR) == sv[1]);
71 for (i = 0; i < ac; ++i) {
72 assert(close(fds[i]) == 0);
76 cmsg_size += CMSG_SPACE(sizeof(struct ucred));
77 cmsg = tail_alloc(cmsg_size);
78 memset(cmsg, 0, cmsg_size);
79 mh->msg_control = cmsg;
80 mh->msg_controllen = cmsg_size;
82 assert(recvmsg(0, mh, 0) == (int) data_size);
83 assert(close(0) == 0);