mirror of
https://github.com/uselessd/alcove.git
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ca0d6f12b4
Return {error, unsupported} if an atom is used as an argument and the
constant the atom represents does not exist on the current platform.
The previous behaviour was inconsistent and non-deterministic. The
constant might:
* return {error,einval}. System return values could not be distinguished
from alcove return values.
* cause an exception
* be silently ignored
60 lines
1.8 KiB
C
60 lines
1.8 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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#include "alcove_prio_constants.h"
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/*
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* setpriority(2)
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*/
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ssize_t
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alcove_sys_setpriority(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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int index = 0;
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int which = 0;
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int who = 0;
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int prio = 0;
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switch (alcove_decode_define(arg, len, &index, &which,
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alcove_prio_constants)) {
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case 0:
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break;
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case 1:
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return alcove_mk_error(reply, rlen, "unsupported");
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default:
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return -1;
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}
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switch (alcove_decode_define(arg, len, &index, &who,
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alcove_prio_constants)) {
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case 0:
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break;
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case 1:
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return alcove_mk_error(reply, rlen, "unsupported");
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default:
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return -1;
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}
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if (alcove_decode_int(arg, len, &index, &prio) < 0)
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return -1;
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if (setpriority(which, who, prio) < 0)
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return alcove_mk_errno(reply, rlen, errno);
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return alcove_mk_atom(reply, rlen, "ok");
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}
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