1MONGOC_HANDSHAKE_DATA_APPEND(3)    libmongoc   MONGOC_HANDSHAKE_DATA_APPEND(3)
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SYNOPSIS

6          bool
7          mongoc_handshake_data_append (const char *driver_name,
8                                        const char *driver_version,
9                                        const char *platform);
10
11       Appends  the  given  strings to the handshake data for the underlying C
12       Driver.
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DESCRIPTION

15       This function is intended for use by drivers which wrap the  C  Driver.
16       Calling  this  function  will store the given strings as handshake data
17       about the system and driver by appending them to the handshake data for
18       the  underlying C Driver. These values, along with other handshake data
19       collected during mongoc_init will be sent to the server as part of  the
20       initial  connection  handshake  in the "client" document. This function
21       must not be called more than once, or after server  monitoring  begins.
22       For  a single-threaded mongoc_client_t, server monitoring begins on the
23       first operation requiring a server. For a mongoc_client_pool_t,  server
24       monitoring begins on the first call to :symbol:`mongoc_client_pool_pop.
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26       The  passed in strings are copied, and don't have to remain valid after
27       the call to mongoc_handshake_data_append(). The driver may store  trun‐
28       cated versions of the passed in strings.
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30       NOTE:
31          This function allocates memory, and therefore caution should be used
32          when using this in conjunction with bson_mem_set_vtable().  If  this
33          function    is    called    before    bson_mem_set_vtable(),    then
34          bson_mem_restore_vtable()   must   be    called    before    calling
35          mongoc_cleanup(). Failure to do so will result in memory being freed
36          by the wrong allocator.
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PARAMETERS

39       • driver_name: An optional string storing  the  name  of  the  wrapping
40         driver
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42       • driver_version:  An  optional string storing the version of the wrap‐
43         ping driver.
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45       • platform: An optional string storing any information about  the  cur‐
46         rent platform, for example configure options or compile flags.
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RETURNS

49       true  if  the  given fields are set successfully. Otherwise, it returns
50       false and logs an error.
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52       The default handshake data the driver sends with  "hello"  looks  some‐
53       thing like:
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55          client: {
56            driver: {
57              name: "mongoc",
58              version: "1.5.0"
59            },
60            os: {...},
61            platform: "CC=gcc CFLAGS=-Wall -pedantic"
62          }
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64       If we call mongoc_handshake_data_append() ("phongo", "1.1.8", "CC=clang
65       / ") and it returns true, the driver sends handshake data like:
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67          client: {
68            driver: {
69              name: "mongoc / phongo",
70              version: "1.5.0 / 1.1.8"
71            },
72            os: {...},
73            platform: "CC=clang / gcc CFLAGS=-Wall -pedantic"
74          }
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AUTHOR

77       MongoDB, Inc
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80       2017-present, MongoDB, Inc
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851.25.1                           Nov 08, 2023  MONGOC_HANDSHAKE_DATA_APPEND(3)
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