64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2015 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 3 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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#include "console.h"
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/* read from input, write to output */
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void
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passthrough(int input, int output)
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{
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int32_t pid, r, w;
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uint8_t *buf;
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char *name;
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name = smprint("coping %d to %d", input, output);
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pid = getpid();
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buf = (uint8_t*)malloc(IODATASZ);
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debug("%s (%d): started\n", name, pid);
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do
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{
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w = 0;
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r = read(input, buf, IODATASZ);
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//debug("%s (%d): read(%d) returns %d\n", name, pid, input, r);
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if(r > 0){
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w = write(output, buf, r);
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//debug("%s (%d): write(%d, buf, %d) returns %d\n", name, pid, output, r, w);
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}
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//debug("%s (%d): r = %d, w = %d\n", name, pid, r, w);
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}
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while(r > 0 && w == r);
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close(input);
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debug("%s (%d): close(%d)\n", name, pid, input);
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close(output);
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debug("%s (%d): close(%d)\n", name, pid, output);
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debug("%s (%d) shut down (r = %d, w = %d)\n", name, pid, r, w);
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if(r < 0)
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exits("passthrough: read");
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if(w < 0)
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exits("passthrough: write");
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if(w < r)
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exits("passthrough: i/o error");
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exits(nil);
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}
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