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, 180 insertions, 0 deletions

diff --git a/src/shared/exit-status.c b/src/shared/exit-status.c
new file mode 100644
index 0000000000..ab8907d32c
--- /dev/null
+++ b/src/shared/exit-status.c
@@ -0,0 +1,180 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 <stdlib.h>
+#include <sys/wait.h>
+
+#include "exit-status.h"
+
+const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level) {
+
+        /* We cast to int here, so that -Wenum doesn't complain that
+         * EXIT_SUCCESS/EXIT_FAILURE aren't in the enum */
+
+        switch ((int) status) {
+
+        case EXIT_SUCCESS:
+                return "SUCCESS";
+
+        case EXIT_FAILURE:
+                return "FAILURE";
+        }
+
+
+        if (level == EXIT_STATUS_SYSTEMD || level == EXIT_STATUS_LSB) {
+                switch ((int) status) {
+
+                case EXIT_CHDIR:
+                        return "CHDIR";
+
+                case EXIT_NICE:
+                        return "NICE";
+
+                case EXIT_FDS:
+                        return "FDS";
+
+                case EXIT_EXEC:
+                        return "EXEC";
+
+                case EXIT_MEMORY:
+                        return "MEMORY";
+
+                case EXIT_LIMITS:
+                        return "LIMITS";
+
+                case EXIT_OOM_ADJUST:
+                        return "OOM_ADJUST";
+
+                case EXIT_SIGNAL_MASK:
+                        return "SIGNAL_MASK";
+
+                case EXIT_STDIN:
+                        return "STDIN";
+
+                case EXIT_STDOUT:
+                        return "STDOUT";
+
+                case EXIT_CHROOT:
+                        return "CHROOT";
+
+                case EXIT_IOPRIO:
+                        return "IOPRIO";
+
+                case EXIT_TIMERSLACK:
+                        return "TIMERSLACK";
+
+                case EXIT_SECUREBITS:
+                        return "SECUREBITS";
+
+                case EXIT_SETSCHEDULER:
+                        return "SETSCHEDULER";
+
+                case EXIT_CPUAFFINITY:
+                        return "CPUAFFINITY";
+
+                case EXIT_GROUP:
+                        return "GROUP";
+
+                case EXIT_USER:
+                        return "USER";
+
+                case EXIT_CAPABILITIES:
+                        return "CAPABILITIES";
+
+                case EXIT_CGROUP:
+                        return "CGROUP";
+
+                case EXIT_SETSID:
+                        return "SETSID";
+
+                case EXIT_CONFIRM:
+                        return "CONFIRM";
+
+                case EXIT_STDERR:
+                        return "STDERR";
+
+                case EXIT_TCPWRAP:
+                        return "TCPWRAP";
+
+                case EXIT_PAM:
+                        return "PAM";
+
+                case EXIT_NETWORK:
+                        return "NETWORK";
+
+                case EXIT_NAMESPACE:
+                        return "NAMESPACE";
+                }
+        }
+
+        if (level == EXIT_STATUS_LSB) {
+                switch ((int) status) {
+
+                case EXIT_INVALIDARGUMENT:
+                        return "INVALIDARGUMENT";
+
+                case EXIT_NOTIMPLEMENTED:
+                        return "NOTIMPLEMENTED";
+
+                case EXIT_NOPERMISSION:
+                        return "NOPERMISSION";
+
+                case EXIT_NOTINSTALLED:
+                        return "NOTINSSTALLED";
+
+                case EXIT_NOTCONFIGURED:
+                        return "NOTCONFIGURED";
+
+                case EXIT_NOTRUNNING:
+                        return "NOTRUNNING";
+                }
+        }
+
+        return NULL;
+}
+
+
+bool is_clean_exit(int code, int status) {
+
+        if (code == CLD_EXITED)
+                return status == 0;
+
+        /* If a daemon does not implement handlers for some of the
+         * signals that's not considered an unclean shutdown */
+        if (code == CLD_KILLED)
+                return
+                        status == SIGHUP ||
+                        status == SIGINT ||
+                        status == SIGTERM ||
+                        status == SIGPIPE;
+
+        return false;
+}
+
+bool is_clean_exit_lsb(int code, int status) {
+
+        if (is_clean_exit(code, status))
+                return true;
+
+        return
+                code == CLD_EXITED &&
+                (status == EXIT_NOTINSTALLED || status == EXIT_NOTCONFIGURED);
+}