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51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <unistd.h>
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/* Create a one-way communication channel (pipe).
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Actually the channel is two-way on the Hurd.
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If successful, two file descriptors are stored in FDS;
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bytes written on FDS[1] can be read from FDS[0].
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Returns 0 if successful, -1 if not. */
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int
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__pipe (int fds[2])
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{
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int save_errno = errno;
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int result;
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/* The magic S_IFIFO protocol tells the pflocal server to create
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sockets which report themselves as FIFOs, as POSIX requires for
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pipes. */
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result = __socketpair (PF_LOCAL, SOCK_STREAM, S_IFIFO, fds);
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if (result == -1 && errno == EPROTONOSUPPORT)
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{
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/* We contacted an "old" pflocal server that doesn't support the
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magic S_IFIFO protocol.
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FIXME: Remove this junk somewhere in the future. */
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__set_errno (save_errno);
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return __socketpair (PF_LOCAL, SOCK_STREAM, 0, fds);
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}
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return result;
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}
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libc_hidden_def (__pipe)
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weak_alias (__pipe, pipe)
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