ssize_t

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                             MONGOC_STREAM_READ(3)

       • stream: A mongoc_stream_t.

       • buf: The buffer to read into.

       • count: The number of bytes to read.

       • min_bytes: The minimum number of bytes to read, or else indicate failure.

       • timeout_msec:  The  number  of  milliseconds  to wait before failure, a timeout of 0 will not block. If
         negative, use the default timeout.

       The mongoc_stream_read() function shall perform a read from a mongoc_stream_t. It's modeled  on  the  API
       and semantics of read(), though the parameters map only loosely.

       WARNING:
          The  "default  timeout"  indicated  by  a  negative  value  is  both  unspecified and unrelated to the
          documented default values for *TimeoutMS URI options.  To  specify  a  default  timeout  value  for  a
          *TimeoutMS URI option, use the MONGOC_DEFAULT_* constants defined in mongoc-client.h.

       The  mongoc_stream_read()  function  returns  the  number of bytes read on success. It returns >=0 and <min_bytes when end-of-file is encountered and -1 on failure. errno is set upon failure.

       SEEALSO:mongoc_stream_readv()mongoc_stream_write()mongoc_stream_writev()

          ssize_t
          mongoc_stream_read (mongoc_stream_t *stream,
                              void *buf,
                              size_t count,
                              size_t min_bytes,
                              int32_t timeout_msec);