sd-daemon: split off sd_readahead() since it is not a feature of systemd itself but of an auxiliary tool

4 files changed, 161 insertions, 48 deletions

diff --git a/src/sd-daemon.c b/src/sd-daemon.c
index 316fccc50a..9c23b917f9 100644
--- a/src/sd-daemon.c
+++ b/src/sd-daemon.c
@@ -433,41 +433,3 @@ int sd_booted(void) {
         return a.st_dev != b.st_dev;
 #endif
 }
-
-static int touch(const char *path) {
-
-#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
-        int fd;
-
-        mkdir("/dev/.systemd", 0755);
-        mkdir("/dev/.systemd/readahead", 0755);
-
-        if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666)) < 0)
-                return -errno;
-
-        for (;;) {
-                if (close(fd) >= 0)
-                        break;
-
-                if (errno != -EINTR)
-                        return -errno;
-        }
-
-#endif
-        return 0;
-}
-
-int sd_readahead(const char *action) {
-
-        if (!action)
-                return -EINVAL;
-
-        if (strcmp(action, "cancel") == 0)
-                return touch("/dev/.systemd/readahead/cancel");
-        else if (strcmp(action, "done") == 0)
-                return touch("/dev/.systemd/readahead/done");
-        else if (strcmp(action, "noreplay") == 0)
-                return touch("/dev/.systemd/readahead/noreplay");
-
-        return -EINVAL;
-}
diff --git a/src/sd-daemon.h b/src/sd-daemon.h
index 2fbfe955ce..fdf3cc0354 100644
--- a/src/sd-daemon.h
+++ b/src/sd-daemon.h
@@ -67,17 +67,21 @@ extern "C" {
   See sd-daemon(7) for more information.
 */
 
+#ifndef _sd_printf_attr_
 #if __GNUC__ >= 4
 #define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
 #else
 #define _sd_printf_attr_(a,b)
 #endif
+#endif
 
+#ifndef _sd_hidden_
 #if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
 #define _sd_hidden_ __attribute__ ((visibility("hidden")))
 #else
 #define _sd_hidden_
 #endif
+#endif
 
 /*
   Log levels for usage on stderr:
@@ -254,16 +258,6 @@ int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_attr_(
 */
 int sd_booted(void) _sd_hidden_;
 
-/*
-  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);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sd-readahead.c b/src/sd-readahead.c
new file mode 100644
index 0000000000..41e6d3d20e
--- /dev/null
+++ b/src/sd-readahead.c
@@ -0,0 +1,76 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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.
+***/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "sd-readahead.h"
+
+static int touch(const char *path) {
+
+#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
+        int fd;
+
+        mkdir("/dev/.systemd", 0755);
+        mkdir("/dev/.systemd/readahead", 0755);
+
+        if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666)) < 0)
+                return -errno;
+
+        for (;;) {
+                if (close(fd) >= 0)
+                        break;
+
+                if (errno != -EINTR)
+                        return -errno;
+        }
+
+#endif
+        return 0;
+}
+
+int sd_readahead(const char *action) {
+
+        if (!action)
+                return -EINVAL;
+
+        if (strcmp(action, "cancel") == 0)
+                return touch("/dev/.systemd/readahead/cancel");
+        else if (strcmp(action, "done") == 0)
+                return touch("/dev/.systemd/readahead/done");
+        else if (strcmp(action, "noreplay") == 0)
+                return touch("/dev/.systemd/readahead/noreplay");
+
+        return -EINVAL;
+}
diff --git a/src/sd-readahead.h b/src/sd-readahead.h
new file mode 100644
index 0000000000..5bf975a741
--- /dev/null
+++ b/src/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