| /* Copyright (C) 1992-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| /* Create a one-way communication channel (pipe). |
| Actually the channel is two-way on the Hurd. |
| If successful, two file descriptors are stored in FDS; |
| bytes written on FDS[1] can be read from FDS[0]. |
| Returns 0 if successful, -1 if not. */ |
| int |
| __pipe (int fds[2]) |
| { |
| int save_errno = errno; |
| int result; |
| |
| /* The magic S_IFIFO protocol tells the pflocal server to create |
| sockets which report themselves as FIFOs, as POSIX requires for |
| pipes. */ |
| result = __socketpair (PF_LOCAL, SOCK_STREAM, S_IFIFO, fds); |
| if (result == -1 && errno == EPROTONOSUPPORT) |
| { |
| /* We contacted an "old" pflocal server that doesn't support the |
| magic S_IFIFO protocol. |
| FIXME: Remove this junk somewhere in the future. */ |
| __set_errno (save_errno); |
| return __socketpair (PF_LOCAL, SOCK_STREAM, 0, fds); |
| } |
| |
| return result; |
| } |
| libc_hidden_def (__pipe) |
| weak_alias (__pipe, pipe) |
