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57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "alcove.h"
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#include "alcove_call.h"
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#ifdef __linux__
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#include <linux/unistd.h>
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#endif
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/*
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* pivot_root(2)
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*
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*/
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ssize_t
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alcove_sys_pivot_root(alcove_state_t *ap, const char *arg, size_t len,
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char *reply, size_t rlen)
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{
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#ifdef __linux__
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int index = 0;
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char new_root[PATH_MAX] = {0};
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char put_old[PATH_MAX] = {0};
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size_t nlen = sizeof(new_root)-1;
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size_t plen = sizeof(put_old)-1;
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int rv = 0;
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/* new_root */
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if (alcove_decode_iolist(arg, len, &index, new_root, &nlen) < 0 ||
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nlen == 0)
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return -1;
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/* put_old */
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if (alcove_decode_iolist(arg, len, &index, put_old, &plen) < 0 ||
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plen == 0)
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return -1;
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rv = syscall(__NR_pivot_root, new_root, put_old);
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return (rv < 0)
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? alcove_mk_errno(reply, rlen, errno)
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: alcove_mk_atom(reply, rlen, "ok");
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#else
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return alcove_mk_atom(reply, rlen, "undef");
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#endif
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}
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