service: add options RestartPreventExitStatus and SuccessExitStatus

In some cases, like wrong configuration, restarting after error
does not help, so administrator can specify statuses by RestartPreventExitStatus
which will not cause restart of a service.

Sometimes you have non-standart exit status, so this can be specified
by SuccessfulExitStatus.

src/shared/conf-parser.c

@@ -32,6 +32,8 @@
 #include "log.h"
 #include "utf8.h"
 #include "path-util.h"
+#include "set.h"
+#include "exit-status.h"
 
 int config_item_table_lookup(
                 void *table,
@@ -933,3 +935,71 @@ int config_parse_level(
         *o = (*o & LOG_FACMASK) | x;
         return 0;
 }
+
+int config_parse_set_status(
+                const char *filename,
+                unsigned line,
+                const char *section,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        char *w;
+        size_t l;
+        char *state;
+        int r;
+        ExitStatusSet *status_set = data;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        FOREACH_WORD(w, l, rvalue, state) {
+                int val;
+                char *temp = strndup(w, l);
+                if (!temp)
+                        return log_oom();
+
+                r = safe_atoi(temp, &val);
+                if (r < 0) {
+                        val = signal_from_string_try_harder(temp);
+                        free(temp);
+                        if (val > 0) {
+                                if (!status_set->signal) {
+                                        status_set->signal = set_new(trivial_hash_func, trivial_compare_func);
+                                        if (!status_set->signal)
+                                                return log_oom();
+                                }
+                                r = set_put(status_set->signal, INT_TO_PTR(val));
+                                if (r < 0) {
+                                        log_error("[%s:%u] Unable to store: %s", filename, line, w);
+                                        return r;
+                                }
+                        } else {
+                                log_error("[%s:%u] Failed to parse value: %s", filename, line, w);
+                                return r;
+                        }
+                } else {
+                        free(temp);
+                        if(val < 0 || val > 255)
+                                log_warning("[%s:%u] Value %d is outside range 0-255, ignoring", filename, line, val);
+                        else {
+                                if (!status_set->code) {
+                                        status_set->code = set_new(trivial_hash_func, trivial_compare_func);
+                                        if (!status_set->code)
+                                                return log_oom();
+                                }
+                                r = set_put(status_set->code, INT_TO_PTR(val));
+                                if (r < 0) {
+                                        log_error("[%s:%u] Unable to store: %s", filename, line, w);
+                                        return r;
+                                }
+                        }
+                }
+
+        }
+        return 0;
+}

src/shared/conf-parser.h

@@ -105,6 +105,7 @@ int config_parse_nsec(const char *filename, unsigned line, const char *section,
 int config_parse_mode(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_facility(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_level(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_set_status(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 
 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
         int function(                                                   \

src/shared/exit-status.c

@@ -23,6 +23,8 @@
 #include <sys/wait.h>
 
 #include "exit-status.h"
+#include "set.h"
+#include "macro.h"
 
 const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level) {
 
@@ -158,10 +160,12 @@ const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level) {
 }
 
 
-bool is_clean_exit(int code, int status) {
+bool is_clean_exit(int code, int status, ExitStatusSet *success_status) {
 
         if (code == CLD_EXITED)
-                return status == 0;
+                return status == 0 ||
+                       (success_status &&
+                       set_contains(success_status->code, INT_TO_PTR(status)));
 
         /* If a daemon does not implement handlers for some of the
          * signals that's not considered an unclean shutdown */
@@ -170,14 +174,16 @@ bool is_clean_exit(int code, int status) {
                         status == SIGHUP ||
                         status == SIGINT ||
                         status == SIGTERM ||
-                        status == SIGPIPE;
+                        status == SIGPIPE ||
+                        (success_status &&
+                        set_contains(success_status->signal, INT_TO_PTR(status)));
 
         return false;
 }
 
-bool is_clean_exit_lsb(int code, int status) {
+bool is_clean_exit_lsb(int code, int status, ExitStatusSet *success_status) {
 
-        if (is_clean_exit(code, status))
+        if (is_clean_exit(code, status, success_status))
                 return true;
 
         return

src/shared/exit-status.h

@@ -22,7 +22,7 @@
 ***/
 
 #include <stdbool.h>
-
+#include "set.h"
 typedef enum ExitStatus {
         /* EXIT_SUCCESS defined by libc */
         /* EXIT_FAILURE defined by libc */
@@ -77,7 +77,12 @@ typedef enum ExitStatusLevel {
         EXIT_STATUS_FULL = EXIT_STATUS_LSB
 } ExitStatusLevel;
 
+typedef struct ExitStatusSet {
+        Set *code;
+        Set *signal;
+} ExitStatusSet;
+
 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);
+bool is_clean_exit(int code, int status, ExitStatusSet *success_status);
+bool is_clean_exit_lsb(int code, int status, ExitStatusSet *success_status);

src/shared/hashmap.c

@@ -378,6 +378,21 @@ void* hashmap_get(Hashmap *h, const void *key) {
         return e->value;
 }
 
+bool hashmap_contains(Hashmap *h, const void *key) {
+        unsigned hash;
+        struct hashmap_entry *e;
+
+        if (!h)
+                return false;
+
+        hash = h->hash_func(key) % NBUCKETS;
+
+        if (!(e = hash_scan(h, hash, key)))
+                return false;
+
+        return true;
+}
+
 void* hashmap_remove(Hashmap *h, const void *key) {
         struct hashmap_entry *e;
         unsigned hash;

src/shared/hashmap.h

@@ -53,6 +53,7 @@ int hashmap_ensure_allocated(Hashmap **h, hash_func_t hash_func, compare_func_t
 int hashmap_put(Hashmap *h, const void *key, void *value);
 int hashmap_replace(Hashmap *h, const void *key, void *value);
 void* hashmap_get(Hashmap *h, const void *key);
+bool hashmap_contains(Hashmap *h, const void *key);
 void* hashmap_remove(Hashmap *h, const void *key);
 void* hashmap_remove_value(Hashmap *h, const void *key, void *value);
 int hashmap_remove_and_put(Hashmap *h, const void *old_key, const void *new_key, void *value);

src/shared/set.c

@@ -57,6 +57,10 @@ void *set_get(Set *s, void *value) {
         return hashmap_get(MAKE_HASHMAP(s), value);
 }
 
+bool set_contains(Set *s, void *value) {
+        return hashmap_contains(MAKE_HASHMAP(s), value);
+}
+
 void *set_remove(Set *s, void *value) {
         return hashmap_remove(MAKE_HASHMAP(s), value);
 }

src/shared/set.h

@@ -40,6 +40,7 @@ int set_ensure_allocated(Set **s, hash_func_t hash_func, compare_func_t compare_
 int set_put(Set *s, void *value);
 int set_replace(Set *s, void *value);
 void *set_get(Set *s, void *value);
+bool set_contains(Set *s, void *value);
 void *set_remove(Set *s, void *value);
 int set_remove_and_put(Set *s, void *old_value, void *new_value);
 

src/shared/util.c

@@ -4357,7 +4357,7 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) {
                 }
 
                 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
-                        if (!is_clean_exit(si.si_code, si.si_status)) {
+                        if (!is_clean_exit(si.si_code, si.si_status, NULL)) {
                                 if (si.si_code == CLD_EXITED)
                                         log_error("%s exited with exit status %i.", path, si.si_status);
                                 else