+/**
+@brief Sets the environment entry named \p name in the
+ CTF IR trace class \p trace_class to \p value.
+
+If an environment entry named \p name exists in \p trace_class, its
+value is first put, and then replaced by a new
+\link bt_value_integer_create() integer value object\endlink
+containing \p value.
+
+@param[in] trace_class Trace class of which to set the environment
+ entry.
+@param[in] name Name of the environment entry to set (copied
+ on success).
+@param[in] value Value of the environment entry named \p name.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{trace_class}
+@prenotnull{name}
+@prehot{trace_class}
+@postrefcountsame{trace_class}
+
+@sa bt_ctf_trace_set_environment_field(): Sets the value of a trace
+ class's environment entry.
+*/
+extern int bt_ctf_trace_set_environment_field_integer(
+ struct bt_ctf_trace *trace_class, const char *name,
+ int64_t value);
+
+/**
+@brief Sets the environment entry named \p name in the
+ CTF IR trace class \p trace_class to \p value.
+
+If an environment entry named \p name exists in \p trace_class, its
+value is first put, and then replaced by a new
+\link bt_value_string_create() string value object\endlink
+containing \p value.
+
+@param[in] trace_class Trace class of which to set the environment
+ entry.
+@param[in] name Name of the environment entry to set (copied
+ on success).
+@param[in] value Value of the environment entry named \p name
+ (copied on success).
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{trace_class}
+@prenotnull{name}
+@prenotnull{value}
+@prehot{trace_class}
+@postrefcountsame{trace_class}
+
+@sa bt_ctf_trace_set_environment_field(): Sets the value of a trace
+ class's environment entry.
+*/
+extern int bt_ctf_trace_set_environment_field_string(
+ struct bt_ctf_trace *trace_class, const char *name,
+ const char *value);
+
+/** @} */
+
+/**
+@name Contained field types functions
+@{
+*/
+
+/**
+@brief Returns the packet header field type of the CTF IR trace class
+ \p trace_class.
+
+@param[in] trace_class Trace class of which to get the packet
+ header field type.
+@returns Packet header field type of \p trace_class,
+ or \c NULL if \p trace_class has no packet header field
+ type or on error.
+
+@prenotnull{trace_class}
+@postrefcountsame{trace_class}
+@post <strong>On success, if the return value is a field type</strong>, its
+ reference count is incremented.
+
+@sa bt_ctf_trace_set_packet_header_type(): Sets the packet
+ header field type of a given trace class.
+*/
+extern struct bt_ctf_field_type *bt_ctf_trace_get_packet_header_type(
+ struct bt_ctf_trace *trace_class);
+
+/**
+@brief Sets the packet header field type of the CTF IR trace class
+ \p trace_class to \p packet_header_type, or unsets the current packet
+ header field type from \p trace_class.
+
+If \p packet_header_type is \c NULL, then this function unsets the current
+packet header field type from \p trace_class, effectively making \p trace_class
+a trace without a packet header field type.
+
+As of Babeltrace \btversion, if \p packet_header_type is not \c NULL,
+\p packet_header_type \em must be a CTF IR structure field type object.
+
+@param[in] trace_class Trace class of which to set the packet
+ header field type.
+@param[in] packet_header_type Packet header field type, or \c NULL to unset
+ the current packet header field type.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{trace_class}
+@prehot{trace_class}
+@pre <strong>\p packet_header_type, if not \c NULL</strong>, is a CTF IR
+ structure field type.
+@postrefcountsame{trace_class}
+@post <strong>On success, if \p packet_header_type is not \c NULL</strong>,
+ the reference count of \p packet_header_type is incremented.
+
+@sa bt_ctf_trace_get_packet_header_type(): Returns the packet
+ header field type of a given trace class.
+*/
+extern int bt_ctf_trace_set_packet_header_type(struct bt_ctf_trace *trace_class,
+ struct bt_ctf_field_type *packet_header_type);
+
+/** @} */
+
+/**
+@name Contained clock classes functions
+@{
+*/
+
+/**
+@brief Returns the number of CTF IR clock classes contained in the
+ CTF IR trace class \p trace_class.
+
+@param[in] trace_class Trace class of which to get the number
+ of contained clock classes.
+@returns Number of contained clock classes
+ contained in \p trace_class, or a negative
+ value on error.
+
+@prenotnull{trace_class}
+@postrefcountsame{trace_class}
+*/
+extern int bt_ctf_trace_get_clock_class_count(struct bt_ctf_trace *trace_class);
+
+/**
+@brief Returns the CTF IR clock class at index \p index in the CTF
+ IR trace class \p trace_class.
+
+@param[in] trace_class Trace class of which to get the clock class
+ contained at index \p index.
+@param[in] index Index of the clock class to find in
+ \p trace_class.
+@returns Clock class at index \p index in \p trace_class,
+ or \c NULL on error.
+
+@prenotnull{trace_class}
+@pre \p index is lesser than the number of clock classes contained in
+ the trace class \p trace_class (see
+ bt_ctf_trace_get_clock_class_count()).
+@postrefcountsame{trace_class}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_trace_get_clock_class_by_name(): Finds a clock class by name
+ in a given trace class.
+@sa bt_ctf_trace_add_clock_class(): Adds a clock class to a trace class.
+*/
+extern struct bt_ctf_clock_class *bt_ctf_trace_get_clock_class(
+ struct bt_ctf_trace *trace_class, int index);
+
+/**
+@brief Returns the CTF IR clock class named \c name found in the CTF
+ IR trace class \p trace_class.
+
+@param[in] trace_class Trace class of which to get the clock class
+ named \p name.
+@param[in] name Name of the clock class to find in \p trace_class.
+@returns Clock class named \p name in \p trace_class,
+ or \c NULL on error.
+
+@prenotnull{trace_class}
+@prenotnull{name}
+@postrefcountsame{trace_class}
+@postsuccessrefcountretinc
+
+@sa bt_ctf_trace_get_clock_class(): Returns the clock class contained
+ in a given trace class at a given index.
+@sa bt_ctf_trace_add_clock_class(): Adds a clock class to a trace class.
+*/
+extern struct bt_ctf_clock_class *bt_ctf_trace_get_clock_class_by_name(
+ struct bt_ctf_trace *trace_class, const char *name);
+
+/**
+@brief Adds the CTF IR clock class \p clock_class to the CTF IR
+ trace class \p trace_class.
+
+On success, \p trace_class contains \p clock_class.
+
+You can call this function even if \p trace_class or \p clock_class
+are frozen.
+
+@param[in] trace_class Trace class to which to add \p clock_class.
+@param[in] clock_class Clock class to add to \p trace_class.
+@returns 0 on success, or a negative value on error.
+
+@prenotnull{trace_class}
+@prenotnull{clock_class}
+@postrefcountsame{trace_class}
+@postsuccessrefcountinc{clock_class}
+@post <strong>On success, if \p trace_class is frozen</strong>,
+ \p clock_class is frozen.
+
+@sa bt_ctf_trace_get_clock_class(): Returns the clock class contained
+ in a given trace class at a given index.
+@sa bt_ctf_trace_get_clock_class_by_name(): Finds a clock class by name
+ in a given trace class.
+*/
+extern int bt_ctf_trace_add_clock_class(struct bt_ctf_trace *trace_class,
+ struct bt_ctf_clock_class *clock_class);
+
+/** @} */
+
+/**
+@name Stream class children functions
+@{
+*/
+
+/**
+@brief Returns the number of stream classes contained in the
+ CTF IR trace class \p trace_class.
+
+@param[in] trace_class Trace class of which to get the number
+ of children stream classes.
+@returns Number of children stream classes
+ contained in \p trace_class, or a negative
+ value on error.
+
+@prenotnull{trace_class}
+@postrefcountsame{trace_class}
+*/
+extern int bt_ctf_trace_get_stream_class_count(struct bt_ctf_trace *trace_class);
+
+/**
+@brief Returns the stream class at index \p index in the CTF IR trace
+ class \p trace_class.
+
+@param[in] trace_class Trace class of which to get the stream class.
+@param[in] index Index of the stream class to find.
+@returns Stream class at index \p index, or \c NULL
+ on error.
+
+@prenotnull{trace_class}
+@pre \p index is lesser than the number of stream classes contained in
+ the trace class \p trace_class (see
+ bt_ctf_trace_get_stream_class_count()).
+@postrefcountsame{trace_class}
+
+@sa bt_ctf_trace_get_stream_class_by_id(): Finds a stream class by ID.
+@sa bt_ctf_trace_add_stream_class(): Adds a stream class to a trace class.
+*/