SD-READAHEAD(3)                            sd-readahead                           SD-READAHEAD(3)



NAME
       sd-readahead - Reference implementation of APIs for controlling boot-time read-ahead

SYNOPSIS
       #include "sd-readahead.h"

DESCRIPTION
       sd-readahead.c and sd-readahead.h provide a reference implementation for APIs for
       controlling boot-time read-ahead, as implemented by the read-ahead subsystem of the
       systemd(1) init system.

       See sd_readahead(3) for more information about the function implemented.

NOTES
       This interface is provided by the reference implementation of APIs for controlling
       boot-time read-ahead and distributed with the systemd package. The algorithms it
       implements are simple, and can easily be reimplemented in daemons if it is important to
       support this interface without using the reference implementation. See the respective
       function man pages for details.

       In addition, for details about the algorithms, check the liberally licensed reference
       implementation sources:
       http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c and
       http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h

       These APIs are implemented in the reference implementation's drop-in sd-readahead.c and
       sd-readahead.h files. It is recommended that applications consuming these APIs copy the
       implementation into their source tree, either verbatim or in excerpts. These interfaces
       are currently not available in a dynamic library.

       The functions provided by this interface become NOPs when -DDISABLE_SYSTEMD is set during
       compilation. In addition, if sd-readhead.c is compiled on non-Linux systems it becomes
       NOPs.

SEE ALSO
       systemd(1), sd_readahead(3), sd-daemon(3)



systemd 215                                                                       SD-READAHEAD(3)