Redirect process output to dev null

include/utils/process.hpp

@@ -8,6 +8,8 @@ namespace process_util {
   bool in_parent_process(pid_t pid);
   bool in_forked_process(pid_t pid);
 
+  void redirect_process_output_to_dev_null();
+
   void exec(char* cmd, char** args);
   void exec_sh(const char* cmd);
 

src/utils/command.cpp

@@ -37,6 +37,7 @@ int command<output_policy::IGNORED>::exec(bool wait_for_completion) {
 
   if (process_util::in_forked_process(m_forkpid)) {
     setpgid(m_forkpid, 0);
+    process_util::redirect_process_output_to_dev_null();
     process_util::exec_sh(m_cmd.c_str());
   } else {
     if (wait_for_completion) {

src/utils/process.cpp

@@ -1,9 +1,11 @@
+#include "utils/process.hpp"
+
+#include <fcntl.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include "errors.hpp"
 #include "utils/env.hpp"
-#include "utils/process.hpp"
 #include "utils/string.hpp"
 
 POLYBAR_NS
@@ -23,6 +25,19 @@ namespace process_util {
     return pid == 0;
   }
 
+  void redirect_process_output_to_dev_null() {
+    auto redirect = [](int fd_to_redirect) {
+      int fd = open("/dev/null", O_WRONLY);
+      if (fd < 0 || dup2(fd, fd_to_redirect) < 0) {
+        throw system_error("Failed to redirect process output");
+      }
+      close(fd);
+    };
+
+    redirect(STDOUT_FILENO);
+    redirect(STDERR_FILENO);
+  }
+
   /**
    * Execute command
    */
@@ -105,6 +120,6 @@ namespace process_util {
   bool notify_childprocess() {
     return wait_for_completion_nohang() > 0;
   }
-}
+}  // namespace process_util
 
 POLYBAR_NS_END