4afd3348c7
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
71 lines
3 KiB
C
71 lines
3 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation. All rights reserved.
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Copyright (C) 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <linux/if_packet.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include <stdint.h>
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#include "sd-dhcp-client.h"
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#include "dhcp-protocol.h"
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#include "socket-util.h"
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int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link,
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uint32_t xid, const uint8_t *mac_addr,
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size_t mac_addr_len, uint16_t arp_type);
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int dhcp_network_bind_udp_socket(be32_t address, uint16_t port);
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int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
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const void *packet, size_t len);
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int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
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const void *packet, size_t len);
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int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
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uint8_t code, size_t optlen, const void *optval);
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typedef int (*dhcp_option_cb_t)(uint8_t code, uint8_t len,
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const void *option, void *userdata);
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int dhcp_option_parse(DHCPMessage *message, size_t len, dhcp_option_cb_t cb, void *userdata, char **error_message);
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int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
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uint8_t type, uint16_t arp_type, size_t optlen,
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size_t *optoffset);
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uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
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void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
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uint16_t source, be32_t destination_addr,
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uint16_t destination, uint16_t len);
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int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum);
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/* If we are invoking callbacks of a dhcp-client, ensure unreffing the
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* client from the callback doesn't destroy the object we are working
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* on */
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#define DHCP_CLIENT_DONT_DESTROY(client) \
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_cleanup_(sd_dhcp_client_unrefp) _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
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#define log_dhcp_client(client, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "DHCP CLIENT (0x%x): " fmt, client->xid, ##__VA_ARGS__)
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