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MONGOC_STREAM_READV(3) libmongoc MONGOC_STREAM_READV(3)

SYNOPSIS

ssize_t
mongoc_stream_readv (mongoc_stream_t *stream,


                     mongoc_iovec_t *iov,


                     size_t iovcnt,


                     size_t min_bytes,


                     int32_t timeout_msec);


PARAMETERS

  • stream: A mongoc_stream_t <>.
  • iov: A vector of mongoc_iovec_t <>.
  • iovcnt: The number of items in iov.
  • min_bytes: The minimum number of bytes to read or failure will be indicated.
  • timeout_msec: A timeout in milliseconds, or 0 to indicate non-blocking. A negative value with use the default timeout.

This function is identical to mongoc_stream_read() <> except that it takes a mongoc_iovec_t <> to perform gathered I/O.

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.


RETURNS

>= 0 on success, -1 on failure and errno is set.

See also:

mongoc_stream_read() <>

mongoc_stream_write() <>

mongoc_stream_writev() <>



Author

MongoDB, Inc

Copyright

2009-present, MongoDB, Inc.

December 11, 2025 2.2.1