1KNET_SEND_SYNC(3) Kronosnet Programmer's Manual KNET_SEND_SYNC(3)
2
6 knet_send_sync - Synchronously send data to knet nodes.
7
10 #include <libknet.h>
11 int knet_send_sync(
13 knet_handle_t knet_h,
14 const char *buff,
15 const size_t buff_len,
16 const int8_t channel
17 );
18
20 knet_send_sync
21 knet_h - pointer to knet_handle_t
23 buff - pointer to the buffer of data to send
25 buff_len - length of data to send
27 channel - data channel to use (see knet_handle_add_datafd(3))
29 All knet RX/TX operations are async for performance reasons. There are
31 applications that might need a sync version of data transmission and
32 receive errors in case of failure to deliver to another host.
33 knet_send_sync bypasses the whole TX async layer and delivers data di‐
34 rectly to the link layer, and returns errors accordingly.
35 knet_send_sync sends only one packet to one host at a time. It does NOT
36 support multiple destinations or multicast packets. Decision is still
37 based on dst_host_filter_fn.
38
40 knet_send_sync returns 0 on success and -1 on error. In addition to
41 normal sendmmsg errors, knet_send_sync can fail due to:
42 ECANCELED - data forward is disabled
44 EFAULT - dst_host_filter fatal error
46 EINVAL - dst_host_filter did not provide dst_host_ids_entries on
48 unicast pckts
49 E2BIG - dst_host_filter did return more than one dst_host_ids_en‐
51 tries on unicast pckts
52 ENOMSG - received unknown message type
54 EHOSTDOWN - unicast pckt cannot be delivered because dest host is not
56 connected yet
57 ECHILD - crypto failed
59 EAGAIN - sendmmsg was unable to send all messages and there was no
61 progress during retry
62 ENETDOWN - a packet filter was not installed (necessary for
64 knet_send_sync, but not knet_send)
65
67 knet_handle_remove_datafd(3), knet_handle_get_stats(3),
68 knet_host_add(3), knet_handle_pmtud_setfreq(3),
69 knet_handle_pmtud_get(3), knet_handle_crypto_use_config(3),
70 knet_host_get_id_by_host_name(3), knet_host_get_status(3),
71 knet_link_add_acl(3), knet_link_get_pong_count(3),
72 knet_link_get_priority(3), knet_handle_free(3),
73 knet_handle_enable_sock_notify(3), knet_handle_get_datafd(3),
74 knet_recv(3), knet_link_get_ping_timers(3),
75 knet_log_get_subsystem_id(3), knet_host_remove(3),
76 knet_host_enable_status_change_notify(3), knet_strtoaddr(3),
77 knet_link_rm_acl(3), knet_send(3), knet_handle_enable_pmtud_notify(3),
78 knet_handle_get_transport_reconnect_interval(3),
79 knet_link_get_enable(3), knet_link_set_priority(3),
80 knet_log_set_loglevel(3), knet_handle_get_channel(3),
81 knet_link_get_config(3), knet_link_get_link_list(3),
82 knet_get_transport_list(3), knet_get_transport_id_by_name(3),
83 knet_log_get_loglevel_id(3), knet_handle_new_ex(3),
84 knet_host_set_name(3), knet_addrtostr(3), knet_handle_setfwd(3),
85 knet_get_compress_list(3), knet_host_set_policy(3),
86 knet_get_transport_name_by_id(3), knet_handle_enable_filter(3),
87 knet_handle_crypto_rx_clear_traffic(3), knet_handle_compress(3),
88 knet_link_get_status(3), knet_handle_add_datafd(3),
89 knet_log_get_loglevel_name(3), knet_handle_enable_access_lists(3),
90 knet_host_get_host_list(3), knet_host_get_policy(3),
91 knet_link_set_enable(3), knet_link_set_pong_count(3),
92 knet_log_get_subsystem_name(3), knet_host_get_name_by_host_id(3),
93 knet_link_clear_config(3), knet_log_get_loglevel(3),
94 knet_handle_new(3), knet_handle_pmtud_getfreq(3),
95 knet_handle_pmtud_set(3), knet_handle_clear_stats(3),
96 knet_link_set_config(3), knet_handle_crypto_set_config(3),
97 knet_handle_crypto(3), knet_get_crypto_list(3),
98 knet_handle_set_transport_reconnect_interval(3),
99 knet_link_clear_acl(3), knet_link_set_ping_timers(3),
100 knet_link_insert_acl(3)
101
103 Copyright (C) 2010-2022 Red Hat, Inc. All rights reserved.
104kronosnet 2022-05-30 KNET_SEND_SYNC(3)