sd_bus_message_append_string_memfd(3)

1SD_BUS_MESSAGE_APPEND_SsTdR_IbNuGs__MmEeMsFsDa(g3e)_appenSdD__sBtUrSi_nMgE_SmSeAmGfEd_APPEND_STRING_MEMFD(3)
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NAME

6       sd_bus_message_append_string_memfd, sd_bus_message_append_string_iovec,
7       sd_bus_message_append_string_space - Attach a string to a message
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SYNOPSIS

10       #include <systemd/sd-bus.h>
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12       int sd_bus_message_append_string_memfd(sd_bus_message *m, int memfd);
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14       int sd_bus_message_append_string_iovec(sd_bus_message *m,
15                                              const struct iovec *iov,
16                                              unsigned n);
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18       int sd_bus_message_append_string_space(sd_bus_message *m, size_t size,
19                                              char **s);
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DESCRIPTION

22       The functions sd_bus_message_append_string_memfd and
23       sd_bus_message_append_string_iovec can be used to append a single
24       string (item of type "s") to message m.
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26       In case of sd_bus_message_append_string_memfd, the contents of memfd
27       are the string. They must satisfy the same constraints as described for
28       the "s" type in sd_bus_message_append_basic(3).
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30       In case of sd_bus_message_append_string_iovec, the payload of iov is
31       the string. It must satisfy the same constraints as described for the
32       "s" type in sd_bus_message_append_basic(3).
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34       The iov argument must point to n struct iovec structures. Each
35       structure may have the iov_base field set, in which case the memory
36       pointed to will be copied into the message, or unset, in which case a
37       block of spaces (ASCII 32) of length iov_len will be inserted. The
38       memory pointed at by iov may be changed after this call.
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40       The sd_bus_message_append_string_space function appends space for a
41       string to message m. It behaves similar to sd_bus_message_append_basic
42       with type "s", but instead of copying a string into the message, it
43       returns a pointer to the destination area to the caller in pointer p.
44       Space for the string of length size plus the terminating NUL is
45       allocated.
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RETURN VALUE

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

52       Returned errors may indicate the following problems:
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54       -EINVAL
55           Specified parameter is invalid.
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57       -EPERM
58           Message has been sealed.
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60       -ESTALE
61           Message is in invalid state.
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63       -ENXIO
64           Message cannot be appended to.
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66       -ENOMEM
67           Memory allocation failed.
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NOTES

70       These APIs are implemented as a shared library, which can be compiled
71       and linked to with the libsystemd pkg-config(1) file.
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NOTES

78        1. The D-Bus specification
79           http://dbus.freedesktop.org/doc/dbus-specification.html
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83systemd 239                              SD_BUS_MESSAGE_APPEND_STRING_MEMFD(3)