SD_BUS_MESSAGE_APPEND_STRING_MEMFD - Online Linux Manual PageSection : 3
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Source : systemd 250
Note : sd_bus_message_append_string_memfd
NAMEsd_bus_message_append_string_memfd, sd_bus_message_append_string_iovec, sd_bus_message_append_string_space − Attach a string to a message
SYNOPSIS#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);
DESCRIPTIONThe 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.
RETURN VALUEOn success, those calls return 0 or a positive integer. On failure, they return a negative errno−style error code.
ErrorsReturned 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.
NOTESThese APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.
SEE ALSOsystemd(1), sd-bus(3), sd_bus_message_append_basic(3), The D−Bus specification[1]
NOTES 1. The D-Bus specification http://dbus.freedesktop.org/doc/dbus-specification.html 0
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