'\" t
.TH "SD\-DLOPEN" "3" "" "systemd 261~rc3" "sd-dlopen"
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.SH "NAME"
sd-dlopen \- ELF dlopen metadata annotation macros
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-dlopen\&.h>
.fi
.ft
.HP \w'\fBpkg\-config\ \-\-cflags\ libsystemd\fR\ 'u
\fBpkg\-config \-\-cflags libsystemd\fR
.SH "DESCRIPTION"
.PP
sd\-dlopen\&.h
provides macros for embedding
\&.note\&.dlopen
metadata in ELF binaries, implementing the
\m[blue]\fBELF dlopen metadata\fR\m[]\&\s-2\u[1]\d\s+2
specification for declaring optional shared library dependencies that are loaded via
\fBdlopen\fR(3)
at runtime\&.
.PP
The header is self\-contained and does not require runtime linkage against
\fBlibsystemd\fR(3)\&. Projects only need the installed header to use the macros\&.
.PP
Package managers and build systems can read the embedded ELF notes to discover runtime dependencies that are not visible in ELF
\fBDT_NEEDED\fR
entries\&.
.PP
See
\fBSD_ELF_NOTE_DLOPEN\fR(3)
for details on the available macros and constants\&.
.SH "NOTES"
.PP
The macros described here are header\-only and do not require runtime linkage against
\fBlibsystemd\fR(3)\&. Only the installed header and include path (as provided by
\fBpkg\-config \-\-cflags libsystemd\fR) are needed\&.
.SH "HISTORY"
.PP
\fBSD_ELF_NOTE_DLOPEN()\fR
and associated macros and constants were added in version 261\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBSD_ELF_NOTE_DLOPEN\fR(3), \fBdlopen\fR(3)
.SH "NOTES"
.IP " 1." 4
ELF dlopen metadata
.RS 4
\%https://uapi-group.org/specifications/specs/elf_dlopen_metadata/
.RE