Processing (Linux): fix hanging if a child process prints to both stdout and stderr

Author: CarterLi

CHANGELOG.md

@@ -31,6 +31,7 @@ Bugfixes:
 * Detect BSSID instead of Wifi MAC address to align with other platforms (Wifi, macOS)
 * Remove support of used GPU memory detection, which is not reliable and only supported with `--gpu-force-vulkan`. (GPU)
 * Fix flag `--brightness-ddcci-sleep` (Brightness, Linux)
+* Fix hanging if a child process prints to both stdout and stderr (Linux)
 
 Logos:
 * Add Black Mesa

src/common/processing_linux.c

@@ -34,10 +34,11 @@ const char* ffProcessAppendOutput(FFstrbuf* buffer, char* const argv[], bool use
     //Child
     if(childPid == 0)
     {
+        int nullFile = open("/dev/null", O_WRONLY);
         dup2(pipes[1], useStdErr ? STDERR_FILENO : STDOUT_FILENO);
+        dup2(nullFile, useStdErr ? STDOUT_FILENO : STDERR_FILENO);
         close(pipes[0]);
         close(pipes[1]);
-        close(useStdErr ? STDOUT_FILENO : STDERR_FILENO);
         setenv("LANG", "C", 1);
         execvp(argv[0], argv);
         exit(901);