Use EXIT_SUCCESS/EXIT_FAILURE instead of 0/1

Author: nobu

debug.c

@@ -368,7 +368,7 @@ setup_debug_log_filter(void)
 
             if (len >= MAX_DEBUG_LOG_FILTER_LEN) {
                 fprintf(stderr, "too long: %s (max:%d)\n", str, MAX_DEBUG_LOG_FILTER_LEN - 1);
-                exit(1);
+                exit(EXIT_FAILURE);
             }
 
             // body
@@ -396,7 +396,7 @@ setup_debug_log(void)
             debug_log.mem = (char *)malloc(MAX_DEBUG_LOG * MAX_DEBUG_LOG_MESSAGE_LEN);
             if (debug_log.mem == NULL) {
                 fprintf(stderr, "setup_debug_log failed (can't allocate memory)\n");
-                exit(1);
+                exit(EXIT_FAILURE);
             }
             ruby_debug_log_mode |= ruby_debug_log_memory;
         }
@@ -424,7 +424,7 @@ setup_debug_log(void)
                         break;
                       default:
                         fprintf(stderr, "can not parse RUBY_DEBUG_LOG filename: %s\n", log_config);
-                        exit(1);
+                        exit(EXIT_FAILURE);
                     }
                 }
                 else {
@@ -433,13 +433,13 @@ setup_debug_log(void)
 
                 if (j >= DEBUG_LOG_MAX_PATH) {
                     fprintf(stderr, "RUBY_DEBUG_LOG=%s is too long\n", log_config);
-                    exit(1);
+                    exit(EXIT_FAILURE);
                 }
             }
 
             if ((debug_log.output = fopen(debug_log.output_file, "w")) == NULL) {
                 fprintf(stderr, "can not open %s for RUBY_DEBUG_LOG\n", log_config);
-                exit(1);
+                exit(EXIT_FAILURE);
             }
             setvbuf(debug_log.output, NULL, _IONBF, 0);
         }

gc.c

@@ -714,7 +714,7 @@ ruby_modular_gc_init(void)
                 break;
               default:
                 fprintf(stderr, "Only alphanumeric, dash, and underscore is allowed in "RUBY_GC_LIBRARY"\n");
-                exit(1);
+                exit(EXIT_FAILURE);
             }
         }
 
@@ -761,7 +761,7 @@ ruby_modular_gc_init(void)
         handle = dlopen(gc_so_path, RTLD_LAZY | RTLD_GLOBAL);
         if (!handle) {
             fprintf(stderr, "ruby_modular_gc_init: Shared library %s cannot be opened: %s\n", gc_so_path, dlerror());
-            exit(1);
+            exit(EXIT_FAILURE);
         }
 
         gc_functions.modular_gc_loaded_p = true;
@@ -773,7 +773,7 @@ ruby_modular_gc_init(void)
         gc_functions.name = dlsym(handle, func_name); \
         if (!gc_functions.name) { \
             fprintf(stderr, "ruby_modular_gc_init: %s function not exported by library %s\n", func_name, gc_so_path); \
-            exit(1); \
+            exit(EXIT_FAILURE); \
         } \
     } \
     else { \

io.c

@@ -8079,7 +8079,7 @@ popen_finish(VALUE port, VALUE klass)
             rb_protect(rb_yield, Qnil, NULL);
             rb_io_flush(rb_ractor_stdout());
             rb_io_flush(rb_ractor_stderr());
-            _exit(0);
+            _exit(EXIT_SUCCESS);
         }
         return Qnil;
     }