/usr/include/libmongoc-1.0/mongoc-handshake.h is in libmongoc-dev 1.9.2+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /*
 * Copyright 2016 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef MONGOC_HANDSHAKE_H
#define MONGOC_HANDSHAKE_H
#if !defined(MONGOC_INSIDE) && !defined(MONGOC_COMPILATION)
#error "Only <mongoc.h> can be included directly."
#endif
#include <bson.h>
#include "mongoc-macros.h"
BSON_BEGIN_DECLS
#define MONGOC_HANDSHAKE_APPNAME_MAX 128
/**
 * mongoc_handshake_data_append:
 *
 * This function is intended for use by drivers which wrap the C Driver.
 * Calling this function will store the given strings as handshake data about
 * the system and driver by appending them to the handshake data for the
 * underlying C Driver. These values, along with other handshake data collected
 * during mongoc_init will be sent to the server as part of the initial
 * connection handshake in the "client" document. This function cannot be
 * called more than once, or after a handshake has been initiated.
 *
 * The passed in strings are copied, and don't have to remain valid after the
 * call to mongoc_handshake_data_append(). The driver may store truncated
 * versions of the passed in strings.
 *
 * Note:
 *   This function allocates memory, and therefore caution should be used when
 *   using this in conjunction with bson_mem_set_vtable. If this function is
 *   called before bson_mem_set_vtable, then bson_mem_restore_vtable must be
 *   called before calling mongoc_cleanup. Failure to do so will result in
 *   memory being freed by the wrong allocator.
 *
 *
 * @driver_name: An optional string storing the name of the wrapping driver
 * @driver_version: An optional string storing the version of the wrapping
 * driver.
 * @platform: An optional string storing any information about the current
 *            platform, for example configure options or compile flags.
 *
 *
 * Returns true if the given fields are set successfully. Otherwise, it returns
 * false and logs an error.
 *
 * The default handshake data the driver sends with "isMaster" looks something
 * like:
 *  client: {
 *    driver: {
 *      name: "mongoc",
 *      version: "1.5.0"
 *    },
 *    os: {...},
 *    platform: "CC=gcc CFLAGS=-Wall -pedantic"
 *  }
 *
 * If we call
 *   mongoc_handshake_data_append ("phongo", "1.1.8", "CC=clang")
 * and it returns true, the driver sends handshake data like:
 *  client: {
 *    driver: {
 *      name: "mongoc / phongo",
 *      version: "1.5.0 / 1.1.8"
 *    },
 *    os: {...},
 *    platform: "CC=gcc CFLAGS=-Wall -pedantic / CC=clang"
 *  }
 *
 */
MONGOC_EXPORT (bool)
mongoc_handshake_data_append (const char *driver_name,
                              const char *driver_version,
                              const char *platform);
BSON_END_DECLS
#endif
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