alcove

/* Copyright (c) 2014-2017, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "alcove.h"
#include "alcove_call.h"
#include "alcove_file_constants.h"

#include <sys/stat.h>
#include <fcntl.h>

/*
 * open(2)
 *
 */
    ssize_t
alcove_sys_open(alcove_state_t *ap, const char *arg, size_t len,
        char *reply, size_t rlen)
{
    int index = 0;
    int rindex = 0;
    char pathname[PATH_MAX] = {0};
    size_t plen = sizeof(pathname)-1;
    int flags = 0;
    mode_t mode = {0};
    int fd = 0;

    u_int32_t val = 0;

    UNUSED(ap);

    /* pathname */
    if (alcove_decode_iolist(arg, len, &index, pathname, &plen) < 0 ||
            plen == 0)
        return -1;

    /* flags */
    switch (alcove_decode_constant_list(arg, len, &index, &flags,
                alcove_file_constants)) {
        case 0:
            break;
        case 1:
            return alcove_mk_error(reply, rlen, "enotsup");
        default:
            return -1;
    }

    /* mode */
    if (alcove_decode_uint(arg, len, &index, &val) < 0)
        return -1;

    mode = val;

    fd = open(pathname, flags, mode);

    if (fd < 0)
        return alcove_mk_errno(reply, rlen, errno);

    ALCOVE_OK(
        reply,
        rlen,
        &rindex,
        alcove_encode_long(reply, rlen, &rindex, fd)
    );

    return rindex;
}