AMENDME: redirect userprog to /dev/null instead of closing

diff --git a/fag.c b/fag.c
index 0d7e6d9e1b4e2d608d7df9eadc4ff5ed30a3ad86..39b8a963aced0a839167bde5e55f1435457b3c40 100644 (file)
--- a/fag.c
+++ b/fag.c
@@ -1,4 +1,5 @@
 /* forkaftergrep (C) 2017 Tobias Girstmair, GPLv3 */
+//TODO: `tee': bad file descriptor
 
 #define _XOPEN_SOURCE 500
 #define _DEFAULT_SOURCE
@@ -113,6 +114,7 @@ int fork_after_grep (struct opt opts) {
                close (pipefd[0]);
                dup2 (pipefd[1], opts.stream);
                close (pipefd[1]);
+               //dup2 (open("/dev/null", O_WRONLY), opts.stream==STDOUT_FILENO?STDERR_FILENO:STDOUT_FILENO);
                close (opts.stream==STDOUT_FILENO?STDERR_FILENO:STDOUT_FILENO);
 
                if (setsid () == -1) {
@@ -201,6 +203,9 @@ int fork_after_grep (struct opt opts) {
 
                                                /* create a new child to keep pipe alive (will exit with exec'd program) */
                                                if (!fork ()) {
+                                                       int devnull = open("/dev/null", O_WRONLY);
+                                                       dup2 (devnull, pipefd[0]);
+                                                       close  (devnull);
                                                        while (kill(cpid, 0) != -1 && errno != ESRCH ) sleep (1);
                                                        close (pipefd[0]);
                                                        _exit(0);