1knet_send_sync(3)        Kronosnet Programmer's Manual       knet_send_sync(3)
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NAME

6       knet_send_sync - Synchronously send data to knet nodes.
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SYNOPSIS

9       #include <libknet.h>
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11       int knet_send_sync(
12           knet_handle_t  knet_h,
13           const char    *buff,
14           const size_t   buff_len,
15           const int8_t   channel
16       );
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DESCRIPTION

19       knet_send_sync
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21       knet_h - pointer to knet_handle_t
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23       buff - pointer to the buffer of data to send
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25       buff_len - length of data to send
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27       channel - data channel to use (see knet_handle_add_datafd(3))
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29       All  knet RX/TX operations are async for performance reasons. There are
30       applications that might need a sync version of  data  transmission  and
31       receive  errors  in  case  of  failure  to  deliver  to  another  host.
32       knet_send_sync bypasses the whole TX  async  layer  and  delivers  data
33       directly   to   the   link   layer,  and  returns  errors  accordingly.
34       knet_send_sync sends only one packet to one host at a time. It does NOT
35       support  multiple  destinations or multicast packets. Decision is still
36       based on dst_host_filter_fn.
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RETURN VALUE

39       knet_send_sync returns 0 on success and -1 on  error.  In  addition  to
40       normal  sendmmsg  errors,  knet_send_sync can fail due to: ECANCELED  -
41       data forward is disabled
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43       EFAULT     - dst_host_filter fatal error
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45       EINVAL     - dst_host_filter did not  provide  dst_host_ids_entries  on
46       unicast pckts
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48       E2BIG         -    dst_host_filter    did    return   more   than   one
49       dst_host_ids_entries on unicast pckts
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51       ENOMSG     - received unknown message type
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53       EHOSTDOWN  - unicast pckt cannot be delivered because dest host is  not
54       connected yet
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56       ECHILD     - crypto failed
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58       EAGAIN      - sendmmsg was unable to send all messages and there was no
59       progress during retry
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SEE ALSO

62       knet_handle_remove_datafd(3), knet_handle_get_stats(3),
63       knet_host_add(3), knet_handle_pmtud_setfreq(3),
64       knet_handle_pmtud_get(3), knet_host_get_id_by_host_name(3),
65       knet_host_get_status(3), knet_link_add_acl(3),
66       knet_link_get_pong_count(3), knet_link_get_priority(3),
67       knet_handle_free(3), knet_handle_enable_sock_notify(3),
68       knet_handle_get_datafd(3), knet_recv(3), knet_link_get_ping_timers(3),
69       knet_log_get_subsystem_id(3), knet_host_remove(3),
70       knet_host_enable_status_change_notify(3), knet_strtoaddr(3),
71       knet_link_rm_acl(3), knet_send(3), knet_handle_enable_pmtud_notify(3),
72       knet_handle_get_transport_reconnect_interval(3),
73       knet_link_get_enable(3), knet_link_set_priority(3),
74       knet_log_set_loglevel(3), knet_handle_get_channel(3),
75       knet_link_get_config(3), knet_link_get_link_list(3),
76       knet_get_transport_list(3), knet_get_transport_id_by_name(3),
77       knet_log_get_loglevel_id(3), knet_handle_new_ex(3),
78       knet_host_set_name(3), knet_addrtostr(3), knet_handle_setfwd(3),
79       knet_get_compress_list(3), knet_host_set_policy(3),
80       knet_get_transport_name_by_id(3), knet_handle_enable_filter(3),
81       knet_handle_compress(3), knet_link_get_status(3),
82       knet_handle_add_datafd(3), knet_log_get_loglevel_name(3),
83       knet_handle_enable_access_lists(3), knet_host_get_host_list(3),
84       knet_host_get_policy(3), knet_link_set_enable(3),
85       knet_link_set_pong_count(3), knet_log_get_subsystem_name(3),
86       knet_host_get_name_by_host_id(3), knet_link_clear_config(3),
87       knet_log_get_loglevel(3), knet_handle_new(3),
88       knet_handle_pmtud_getfreq(3), knet_handle_pmtud_set(3),
89       knet_handle_clear_stats(3), knet_link_set_config(3),
90       knet_handle_crypto(3), knet_get_crypto_list(3),
91       knet_handle_set_transport_reconnect_interval(3),
92       knet_link_clear_acl(3), knet_link_set_ping_timers(3),
93       knet_link_insert_acl(3)
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96       Copyright (C) 2010-2020 Red Hat, Inc. All rights reserved.
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100kronosnet                         2020-04-23                 knet_send_sync(3)
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