sd_bus_message_append_string_memfd, sd_bus_message_append_string_iovec, sd_bus_message_append_string_space — Attach a string to a message
#include <systemd/sd-bus.h>
int sd_bus_message_append_string_memfd( | sd_bus_message *m, |
sd_memfd *memfd); |
int sd_bus_message_append_string_iovec( | sd_bus_message *m, |
| const struct iovec *iov, | |
unsigned n); |
int sd_bus_message_append_string_space( | sd_bus_message *m, |
| size_t size, | |
char **s); |
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).
Pointer iov must point to
n struct 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.
Function
sd_bus_message_append_string_space appends
space for a string to message m. If behaves
similarly to sd_bus_message_append_basic with
type "s", but instead of copying a string into
the the message, it returns a pointer to the destination area to
the caller in pointer p. Space for string
of length size plus the terminating
NUL is allocated.
On success, those calls return 0 or a positive integer. On failure, they returns a negative errno-style error code.
Functions described here are available as a shared library,
which can be compiled and linked to with the
libsystemd pkg-config(1)
file.