Honor --nice option when joining

1 files changed, 12 insertions, 0 deletions

diff --git a/src/firejail/join.c b/src/firejail/join.c
index 47d31669d..504748331 100644
--- a/src/firejail/join.c
+++ b/src/firejail/join.c
@@ -23,6 +23,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/prctl.h>
+#include <errno.h>
 
 static int apply_caps = 0;
 static uint64_t caps = 0;
@@ -338,6 +339,17 @@ void join(pid_t pid, int argc, char **argv, int index) {
                 if (setenv("PROMPT_COMMAND", "export PS1=\"\\[\\e[1;32m\\][\\u@\\h \\W]\\$\\[\\e[0m\\] \"", 1) < 0)
                         errExit("setenv");
 
+                // set nice
+                if (arg_nice) {
+                        errno = 0;
+                        int rv = nice(cfg.nice);
+                        (void) rv;
+                        if (errno) {
+                                fprintf(stderr, "Warning: cannot set nice value\n");
+                                errno = 0;
+                        }
+                }
+
                 // run cmdline trough /bin/bash
                 if (cfg.command_line == NULL) {
                         struct stat s;