1 | /* Copyright (C) 1992-2024 Free Software Foundation, Inc. |
2 | |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <sys/socket.h> |
21 | #include <sys/stat.h> |
22 | #include <unistd.h> |
23 | #include <fcntl.h> |
24 | #include <fcntl-internal.h> |
25 | #include <hurd.h> |
26 | |
27 | /* Create a one-way communication channel (pipe). |
28 | Actually the channel is two-way on the Hurd. |
29 | If successful, two file descriptors are stored in FDS; |
30 | bytes written on FDS[1] can be read from FDS[0]. |
31 | Apply FLAGS to the new file descriptors. |
32 | Returns 0 if successful, -1 if not. */ |
33 | int |
34 | __pipe2 (int fds[2], int flags) |
35 | { |
36 | int save_errno = errno; |
37 | int result; |
38 | |
39 | if (flags & ~(O_CLOEXEC | O_NONBLOCK)) |
40 | return __hurd_fail (EINVAL); |
41 | |
42 | flags = o_to_sock_flags (flags); |
43 | |
44 | /* The magic S_IFIFO protocol tells the pflocal server to create |
45 | sockets which report themselves as FIFOs, as POSIX requires for |
46 | pipes. */ |
47 | result = __socketpair (PF_LOCAL, SOCK_STREAM | flags, S_IFIFO, fds: fds); |
48 | if (result == -1 && errno == EPROTONOSUPPORT) |
49 | { |
50 | /* We contacted an "old" pflocal server that doesn't support the |
51 | magic S_IFIFO protocol. |
52 | FIXME: Remove this junk somewhere in the future. */ |
53 | __set_errno (save_errno); |
54 | return __socketpair (PF_LOCAL, SOCK_STREAM | flags, protocol: 0, fds: fds); |
55 | } |
56 | |
57 | return result; |
58 | } |
59 | weak_alias (__pipe2, pipe2) |
60 | |