C++ (Cpp) virCommandAbort Examples

Example #1

File: command.c Project: rbu/libvirt

/*
 * Release all resources
 */
void
virCommandFree(virCommandPtr cmd)
{
    int i;
    if (!cmd)
        return;

    for (i = STDERR_FILENO + 1; i < FD_SETSIZE; i++) {
        if (FD_ISSET(i, &cmd->transfer)) {
            int tmpfd = i;
            VIR_FORCE_CLOSE(tmpfd);
        }
    }

    VIR_FREE(cmd->inbuf);
    VIR_FORCE_CLOSE(cmd->outfd);
    VIR_FORCE_CLOSE(cmd->errfd);

    for (i = 0 ; i < cmd->nargs ; i++)
        VIR_FREE(cmd->args[i]);
    VIR_FREE(cmd->args);

    for (i = 0 ; i < cmd->nenv ; i++)
        VIR_FREE(cmd->env[i]);
    VIR_FREE(cmd->env);

    VIR_FREE(cmd->pwd);

    VIR_FREE(cmd->pidfile);

    if (cmd->reap)
        virCommandAbort(cmd);

    VIR_FREE(cmd);
}

Example #2

File: qemu_interface.c Project: MountainWei/libvirt

/**
 * qemuCreateInBridgePortWithHelper:
 * @cfg: the configuration object in which the helper name is looked up
 * @brname: the bridge name
 * @ifname: the returned interface name
 * @macaddr: the returned MAC address
 * @tapfd: file descriptor return value for the new tap device
 * @flags: OR of virNetDevTapCreateFlags:

 *   VIR_NETDEV_TAP_CREATE_VNET_HDR
 *     - Enable IFF_VNET_HDR on the tap device
 *
 * This function creates a new tap device on a bridge using an external
 * helper.  The final name for the bridge will be stored in @ifname.
 *
 * Returns 0 in case of success or -1 on failure
 */
static int
qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
                                 const char *brname,
                                 char **ifname,
                                 int *tapfd,
                                 unsigned int flags)
{
    virCommandPtr cmd;
    char *errbuf = NULL, *cmdstr = NULL;
    int pair[2] = { -1, -1 };

    if ((flags & ~VIR_NETDEV_TAP_CREATE_VNET_HDR) != VIR_NETDEV_TAP_CREATE_IFUP)
        return -1;

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) < 0) {
        virReportSystemError(errno, "%s", _("failed to create socket"));
        return -1;
    }

    if (!virFileIsExecutable(cfg->bridgeHelperName)) {
        virReportSystemError(errno, _("'%s' is not a suitable bridge helper"),
                             cfg->bridgeHelperName);
        return -1;
    }

    cmd = virCommandNew(cfg->bridgeHelperName);
    if (flags & VIR_NETDEV_TAP_CREATE_VNET_HDR)
        virCommandAddArgFormat(cmd, "--use-vnet");
    virCommandAddArgFormat(cmd, "--br=%s", brname);
    virCommandAddArgFormat(cmd, "--fd=%d", pair[1]);
    virCommandSetErrorBuffer(cmd, &errbuf);
    virCommandDoAsyncIO(cmd);
    virCommandPassFD(cmd, pair[1],
                     VIR_COMMAND_PASS_FD_CLOSE_PARENT);
    virCommandClearCaps(cmd);
#ifdef CAP_NET_ADMIN
    virCommandAllowCap(cmd, CAP_NET_ADMIN);
#endif
    if (virCommandRunAsync(cmd, NULL) < 0) {
        *tapfd = -1;
        goto cleanup;
    }

    do {
        *tapfd = recvfd(pair[0], 0);
    } while (*tapfd < 0 && errno == EINTR);

    if (*tapfd < 0) {
        char ebuf[1024];
        char *errstr = NULL;

        if (!(cmdstr = virCommandToString(cmd)))
            goto cleanup;
        virCommandAbort(cmd);

        if (errbuf && *errbuf &&
            virAsprintf(&errstr, "\nstderr=%s", errbuf) < 0)
            goto cleanup;

        virReportError(VIR_ERR_INTERNAL_ERROR,
            _("%s: failed to communicate with bridge helper: %s%s"),
            cmdstr, virStrerror(errno, ebuf, sizeof(ebuf)),
            errstr ? errstr : "");
        VIR_FREE(errstr);
        goto cleanup;
    }

    if (virNetDevTapGetName(*tapfd, ifname) < 0 ||
        virCommandWait(cmd, NULL) < 0) {
        VIR_FORCE_CLOSE(*tapfd);
        *tapfd = -1;
    }

 cleanup:
    VIR_FREE(cmdstr);
    VIR_FREE(errbuf);
    virCommandFree(cmd);
    VIR_FORCE_CLOSE(pair[0]);
    return *tapfd < 0 ? -1 : 0;
}