summaryrefslogtreecommitdiff
path: root/src/readahead/sd-readahead.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/readahead/sd-readahead.h')
-rw-r--r--src/readahead/sd-readahead.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/readahead/sd-readahead.h b/src/readahead/sd-readahead.h
new file mode 100644
index 0000000000..5bf975a741
--- /dev/null
+++ b/src/readahead/sd-readahead.h
@@ -0,0 +1,81 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosdreadaheadhfoo
+#define foosdreadaheadhfoo
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ Reference implementation of a few boot readahead related
+ interfaces. These interfaces are trivial to implement. To simplify
+ porting we provide this reference implementation. Applications are
+ welcome to reimplement the algorithms described here if they do not
+ want to include these two source files.
+
+ You may compile this with -DDISABLE_SYSTEMD to disable systemd
+ support. This makes all calls NOPs.
+
+ Since this is drop-in code we don't want any of our symbols to be
+ exported in any case. Hence we declare hidden visibility for all of
+ them.
+
+ You may find an up-to-date version of these source files online:
+
+ http://cgit.freedesktop.org/systemd/plain/src/sd-readahead.h
+ http://cgit.freedesktop.org/systemd/plain/src/sd-readahead.c
+
+ This should compile on non-Linux systems, too, but all functions
+ will become NOPs.
+
+ See sd-readahead(7) for more information.
+*/
+
+#ifndef _sd_hidden_
+#if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
+#define _sd_hidden_ __attribute__ ((visibility("hidden")))
+#else
+#define _sd_hidden_
+#endif
+#endif
+
+/*
+ Controls ongoing disk read-ahead operations during boot-up. The argument
+ must be a string, and either "cancel", "done" or "noreplay".
+
+ cancel = terminate read-ahead data collection, drop collected information
+ done = terminate read-ahead data collection, keep collected information
+ noreplay = terminate read-ahead replay
+*/
+int sd_readahead(const char *action) _sd_hidden_;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif