Add return error codes to libcare-ctl.

src/kpatch_log.c

@@ -70,7 +70,7 @@ void kpfatal(const char *fmt, ...)
 	if (parent_pid >= 0)
 		stress_test_notify_parent();
 #endif
-	exit(1);
+	exit(ERROR_FATAL);
 }
 
 extern int elf_errno(void) __attribute__((weak));
@@ -116,7 +116,7 @@ void _kpfatalerror(const char *file, int line, const char *fmt, ...)
 	__valogerror(file, line, fmt, va);
 	va_end(va);
 
-	exit(EXIT_FAILURE);
+	exit(ERROR_FATAL);
 }
 
 int log_file_init(char *fname)

src/kpatch_log.h

@@ -3,6 +3,16 @@
 
 #include <stdio.h>
 
+#define	ERROR_SUCCESS		0	// exit code 0
+#define ERROR_FATAL		-128	// exit code 128
+#define ERROR_GENERAL		-10
+#define ERROR_PATCH		-11	// exit code 246
+#define ERROR_UNPATCH		-12	// exit code 245
+#define ERROR_ARGUMENTS		-13	// exit code 244
+#define ERROR_NOPATCH		-14	// exit code 243
+#define ERROR_ACCESS		-15	// exit code 242
+#define ERROR_BUSY		-16	// exit code 241
+
 extern int log_level, log_indent;
 
 void kplog(int level, const char *fmt, ...) __attribute__((format(printf, 2, 3)));

src/kpatch_user.c

@@ -81,7 +81,7 @@ patch_user(const char *storage_path, int pid,
 
 	ret = storage_init(&storage, storage_path);
 	if (ret < 0)
-		return ret;
+		return ERROR_NOPATCH;
 
 	ret = processes_patch(&storage, pid, is_just_started, send_fd);
 
@@ -981,9 +981,11 @@ processes_do(int pid, callback_t callback, void *data)
 
 		rv = callback(pid, data);
 		if (rv < 0)
-			ret = -1;
-		if (rv == -2)
+			ret = rv;
+		if (rv == -2) {
+			ret = ERROR_GENERAL;
 			break;
+		}
 	}
 
 	closedir(dir);