util: move all to shared/ and split external dependencies in separate internal libraries

Before:
  $ ldd /lib/systemd/systemd-timestamp
  linux-vdso.so.1 =>  (0x00007fffb05ff000)
  libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f90aac57000)
  libcap.so.2 => /lib64/libcap.so.2 (0x00007f90aaa53000)
  librt.so.1 => /lib64/librt.so.1 (0x00007f90aa84a000)
  libc.so.6 => /lib64/libc.so.6 (0x00007f90aa494000)
  /lib64/ld-linux-x86-64.so.2 (0x00007f90aae90000)
  libdl.so.2 => /lib64/libdl.so.2 (0x00007f90aa290000)
  libattr.so.1 => /lib64/libattr.so.1 (0x00007f90aa08a000)
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f90a9e6e000)

After:
  $ ldd systemd-timestamp
  linux-vdso.so.1 =>  (0x00007fff3cbff000)
  libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5eaa1c3000)
  librt.so.1 => /lib64/librt.so.1 (0x00007f5ea9fbb000)
  libc.so.6 => /lib64/libc.so.6 (0x00007f5ea9c04000)
  /lib64/ld-linux-x86-64.so.2 (0x00007f5eaa3fc000)
  libdl.so.2 => /lib64/libdl.so.2 (0x00007f5ea9a00000)
  libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5ea97e4000)

1 files changed, 85 insertions, 0 deletions

diff --git a/src/shared/exit-status.h b/src/shared/exit-status.h
new file mode 100644
index 0000000000..44ef879562
--- /dev/null
+++ b/src/shared/exit-status.h
@@ -0,0 +1,85 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef fooexitstatushfoo
+#define fooexitstatushfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+
+typedef enum ExitStatus {
+        /* EXIT_SUCCESS defined by libc */
+        /* EXIT_FAILURE defined by libc */
+        EXIT_INVALIDARGUMENT = 2,
+        EXIT_NOTIMPLEMENTED = 3,
+        EXIT_NOPERMISSION = 4,
+        EXIT_NOTINSTALLED = 5,
+        EXIT_NOTCONFIGURED = 6,
+        EXIT_NOTRUNNING = 7,
+
+        /* The LSB suggests that error codes >= 200 are "reserved". We
+         * use them here under the assumption that they hence are
+         * unused by init scripts.
+         *
+         * http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html */
+
+        EXIT_CHDIR = 200,
+        EXIT_NICE,
+        EXIT_FDS,
+        EXIT_EXEC,
+        EXIT_MEMORY,
+        EXIT_LIMITS,
+        EXIT_OOM_ADJUST,
+        EXIT_SIGNAL_MASK,
+        EXIT_STDIN,
+        EXIT_STDOUT,
+        EXIT_CHROOT,   /* 210 */
+        EXIT_IOPRIO,
+        EXIT_TIMERSLACK,
+        EXIT_SECUREBITS,
+        EXIT_SETSCHEDULER,
+        EXIT_CPUAFFINITY,
+        EXIT_GROUP,
+        EXIT_USER,
+        EXIT_CAPABILITIES,
+        EXIT_CGROUP,
+        EXIT_SETSID,   /* 220 */
+        EXIT_CONFIRM,
+        EXIT_STDERR,
+        EXIT_TCPWRAP,
+        EXIT_PAM,
+        EXIT_NETWORK,
+        EXIT_NAMESPACE
+
+} ExitStatus;
+
+typedef enum ExitStatusLevel {
+        EXIT_STATUS_MINIMAL,
+        EXIT_STATUS_SYSTEMD,
+        EXIT_STATUS_LSB,
+        EXIT_STATUS_FULL = EXIT_STATUS_LSB
+} ExitStatusLevel;
+
+const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level);
+
+bool is_clean_exit(int code, int status);
+bool is_clean_exit_lsb(int code, int status);
+
+#endif