41 lines
1008 B
C
41 lines
1008 B
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
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*
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* Jehanne is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* Jehanne 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <u.h>
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#include <libc.h>
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int
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jehanne_dup(int oldfd, int newfd)
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{
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FdPair in, out;
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long f;
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in.fd[0] = oldfd;
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in.fd[1] = newfd;
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f = sys_create("#d/new", -1, in.aslong);
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if(f == -1)
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return -1;
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if(f >= 0){
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/* this should never happen */
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sys_close(f);
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return -1;
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}
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out.aslong = ~f;
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return out.fd[1];
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}
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