36f7b1df97
2000-08-02 Mark Kettenis <kettenis@gnu.org> * sysdeps/mach/hurd/socketpair.c (__socketpair): Renamed from socketpair. Made socketpair a weak alias. * sysdeps/mach/hurd/pipe.c (__pipe): Reimplemented using __socketpair. Use S_IFIFO protocol to make pipes POSIX conforming, but fall back on the old protocol if the socket server doesn't support it. * include/sys/socket.h: Add prototype for __socketpair.
51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/* Copyright (C) 1992, 93, 94, 95, 96, 99, 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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/* 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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weak_alias (__pipe, pipe)
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