add safe_logger, and prepare for logical operators

2 files changed, 19 insertions, 0 deletions

diff --git a/include/handler.h b/include/handler.h
index 100c548..8878eec 100644
--- a/include/handler.h
+++ b/include/handler.h
@@ -9,6 +9,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <errno.h>
+#include <atomic>
 
 #include "all.h"
 
@@ -22,6 +23,8 @@ extern sigset_t
     block_job,
     block_io;
 
+inline std::atomic_int exit_code, exit_required_pid;
+
 void signal_init();
 handler_t *Signal(int signum, handler_t *handler);
 void sigchld_handler(int sig);
diff --git a/include/util/io.h b/include/util/io.h
index e995af5..5c0a129 100644
--- a/include/util/io.h
+++ b/include/util/io.h
@@ -99,6 +99,22 @@ void safe_output(T x, T_arg ...arg)
     errno = errno_old;
 }
 
+// async-signal-safe output function
+// example:
+// safe_output("string", 123, variable);
+template <typename ...T_arg>
+void safe_logger(T_arg ...arg)
+{
+    int errno_old = errno;
+
+    if (GLOBAL_DEBUG && verbose)
+    {
+        safe_output(arg...);
+    }
+
+    errno = errno_old;
+}
+
 void unix_error(const char *msg);
 void app_error(const char *msg);