NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | NOTES | COLOPHON

SD_BUS_MESSAGE_APPEND_STRING_MEMFD(3)ppend_string_memfdPPEND_STRING_MEMFD(3)

NAME         top

       sd_bus_message_append_string_memfd,
       sd_bus_message_append_string_iovec,
       sd_bus_message_append_string_space - Attach a string to a message

SYNOPSIS         top

       #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);

DESCRIPTION         top

       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.

RETURN VALUE         top

       On success, those calls return 0 or a positive integer. On failure,
       they returns a negative errno-style error code.

ERRORS         top

       Returned errors may indicate the following problems:

       -EINVAL
           Specified parameter is invalid.

       -EPERM
           Message has been sealed.

       -ESTALE
           Message is in invalid state.

       -ENXIO
           Message cannot be appended to.

       -ENOMEM
           Memory allocation failed.

NOTES         top

       The functions described here are available as a shared library, which
       can be compiled and linked to with the libsystemd pkg-config(1) file.

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_message_append_basic(3), The D-Bus
       specification[1]

NOTES         top

        1. The D-Bus specification
           http://dbus.freedesktop.org/doc/dbus-specification.html

COLOPHON         top

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systemd 233                            SD_BUS_MESSAGE_APPEND_STRING_MEMFD(3)

Pages that refer to this page: sd-bus(3)systemd.directives(7)systemd.index(7)