The functions sd_bus_message_append_string_memfd and
sd_bus_message_append_string_iovec can be used to append a single
string (item of type "s") to message m.
In case of sd_bus_message_append_string_memfd, the contents of memfd
are the string. They must satisfy the same constraints as described
for the "s" type in sd_bus_message_append_basic(3).
In case of sd_bus_message_append_string_iovec, the payload of iov is
the string. It must satisfy the same constraints as described for the
"s" type in sd_bus_message_append_basic(3).
The iov argument must point to nstruct iovec structures. Each
structure may have the iov_base field set, in which case the memory
pointed to will be copied into the message, or unset, in which case a
block of spaces (ASCII 32) of length iov_len will be inserted. The
memory pointed at by iov may be changed after this call.
The sd_bus_message_append_string_space function appends space for a
string to message m. It behaves similar to
sd_bus_message_append_basic with type "s", but instead of copying a
string into the message, it returns a pointer to the destination area
to the caller in pointer p. Space for the string of length size plus
the terminating NUL is allocated.
Returned errors may indicate the following problems:
Specified parameter is invalid.
Message has been sealed.
Message is in invalid state.
Message cannot be appended to.
Memory allocation failed.
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systemd 233 SD_BUS_MESSAGE_APPEND_STRING_MEMFD(3)