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sd-daemon: split off sd_readahead() since it is not a feature of systemd itself but of an auxiliary tool
This commit is contained in:
Lennart Poettering
parent
a55da3cd5e
commit
d0b4880988
@ -310,7 +310,9 @@ dist_doc_DATA = \
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LICENSE \
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DISTRO_PORTING \
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src/sd-daemon.h \
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src/sd-daemon.c
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src/sd-daemon.c \
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src/sd-readahead.h \
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src/sd-readahead.c
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pkgconfigdata_DATA = \
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systemd.pc
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@ -419,6 +421,7 @@ EXTRA_DIST += \
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src/linux/fanotify.h \
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src/initreq.h \
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src/sd-daemon.h \
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src/sd-readahead.h \
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src/special.h \
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src/dbus-common.h \
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src/bus-errors.h \
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@ -708,7 +711,8 @@ systemctl_LDADD = \
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systemd_notify_SOURCES = \
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src/notify.c \
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src/sd-daemon.c
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src/sd-daemon.c \
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src/sd-readahead.c
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systemd_notify_LDADD = \
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libsystemd-basic.la
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@ -433,41 +433,3 @@ int sd_booted(void) {
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return a.st_dev != b.st_dev;
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#endif
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}
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static int touch(const char *path) {
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#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
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int fd;
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mkdir("/dev/.systemd", 0755);
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mkdir("/dev/.systemd/readahead", 0755);
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if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666)) < 0)
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return -errno;
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for (;;) {
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if (close(fd) >= 0)
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break;
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if (errno != -EINTR)
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return -errno;
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}
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#endif
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return 0;
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}
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int sd_readahead(const char *action) {
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if (!action)
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return -EINVAL;
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if (strcmp(action, "cancel") == 0)
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return touch("/dev/.systemd/readahead/cancel");
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else if (strcmp(action, "done") == 0)
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return touch("/dev/.systemd/readahead/done");
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else if (strcmp(action, "noreplay") == 0)
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return touch("/dev/.systemd/readahead/noreplay");
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return -EINVAL;
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}
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@ -67,17 +67,21 @@ extern "C" {
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See sd-daemon(7) for more information.
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*/
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#ifndef _sd_printf_attr_
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#if __GNUC__ >= 4
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#define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
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#else
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#define _sd_printf_attr_(a,b)
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#endif
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#endif
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#ifndef _sd_hidden_
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#if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
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#define _sd_hidden_ __attribute__ ((visibility("hidden")))
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#else
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#define _sd_hidden_
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#endif
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#endif
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/*
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Log levels for usage on stderr:
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@ -254,16 +258,6 @@ int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_attr_(
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*/
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int sd_booted(void) _sd_hidden_;
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/*
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Controls ongoing disk read-ahead operations during boot-up. The argument
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must be a string, and either "cancel", "done" or "noreplay".
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cancel = terminate read-ahead data collection, drop collected information
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done = terminate read-ahead data collection, keep collected information
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noreplay = terminate read-ahead replay
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*/
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int sd_readahead(const char *action);
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#ifdef __cplusplus
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}
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#endif
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76
src/sd-readahead.c
Normal file
76
src/sd-readahead.c
Normal file
@ -0,0 +1,76 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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Copyright 2010 Lennart Poettering
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files
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(the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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***/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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#include "sd-readahead.h"
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static int touch(const char *path) {
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#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
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int fd;
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mkdir("/dev/.systemd", 0755);
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mkdir("/dev/.systemd/readahead", 0755);
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if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666)) < 0)
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return -errno;
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for (;;) {
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if (close(fd) >= 0)
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break;
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if (errno != -EINTR)
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return -errno;
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}
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#endif
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return 0;
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}
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int sd_readahead(const char *action) {
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if (!action)
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return -EINVAL;
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if (strcmp(action, "cancel") == 0)
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return touch("/dev/.systemd/readahead/cancel");
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else if (strcmp(action, "done") == 0)
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return touch("/dev/.systemd/readahead/done");
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else if (strcmp(action, "noreplay") == 0)
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return touch("/dev/.systemd/readahead/noreplay");
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return -EINVAL;
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}
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81
src/sd-readahead.h
Normal file
81
src/sd-readahead.h
Normal file
@ -0,0 +1,81 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#ifndef foosdreadaheadhfoo
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#define foosdreadaheadhfoo
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/***
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Copyright 2010 Lennart Poettering
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files
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(the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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***/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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Reference implementation of a few boot readahead related
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interfaces. These interfaces are trivial to implement. To simplify
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porting we provide this reference implementation. Applications are
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welcome to reimplement the algorithms described here if they do not
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want to include these two source files.
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You may compile this with -DDISABLE_SYSTEMD to disable systemd
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support. This makes all calls NOPs.
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Since this is drop-in code we don't want any of our symbols to be
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exported in any case. Hence we declare hidden visibility for all of
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them.
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You may find an up-to-date version of these source files online:
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http://cgit.freedesktop.org/systemd/plain/src/sd-readahead.h
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http://cgit.freedesktop.org/systemd/plain/src/sd-readahead.c
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This should compile on non-Linux systems, too, but all functions
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will become NOPs.
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See sd-readahead(7) for more information.
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*/
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#ifndef _sd_hidden_
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#if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
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#define _sd_hidden_ __attribute__ ((visibility("hidden")))
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#else
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#define _sd_hidden_
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#endif
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#endif
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/*
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Controls ongoing disk read-ahead operations during boot-up. The argument
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must be a string, and either "cancel", "done" or "noreplay".
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cancel = terminate read-ahead data collection, drop collected information
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done = terminate read-ahead data collection, keep collected information
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noreplay = terminate read-ahead replay
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*/
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int sd_readahead(const char *action) _sd_hidden_;
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#ifdef __cplusplus
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}
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#endif
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#endif
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