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, |
int 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); |
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
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.
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.
On success, those calls return 0 or a positive integer. On failure, they return a negative errno-style error code.
These APIs are implemented as a shared
library, which can be compiled and linked to with the
libsystemd pkg-config(1)
file.