This should finish off the job control issues with lash. Make certain

we have a controlling terminal...
 -Erik

1 files changed, 46 insertions, 15 deletions

diff --git a/shell/lash.c b/shell/lash.c
index 689c720f6..68f673539 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -44,6 +44,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 #include <getopt.h>
+#include <termios.h>
 #include "busybox.h"
 #include "cmdedit.h"
 
@@ -181,7 +182,8 @@ static int argc;
 static char **argv;
 static struct close_me *close_me_head;
 static unsigned int last_jobid;
-
+static int shell_terminal;
+static pid_t shell_pgrp;
 static char *PS1;
 static char *PS2 = "> ";
 
@@ -299,10 +301,9 @@ static int builtin_fg_bg(struct child_prog *child)
         }
 
         if (*child->argv[0] == 'f') {
-                /* Make this job the foreground job */
-                /* suppress messages when run from /linuxrc mag@sysgo.de */
-                if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
-                        perror_msg("tcsetpgrp"); 
+                /* Put the job into the foreground.  */
+                tcsetpgrp(shell_terminal, job->pgrp);
+
                 child->family->job_list->fg = job;
         }
 
@@ -310,10 +311,11 @@ static int builtin_fg_bg(struct child_prog *child)
         for (i = 0; i < job->num_progs; i++)
                 job->progs[i].is_stopped = 0;
 
-        kill(-job->pgrp, SIGCONT);
-
         job->stopped_progs = 0;
 
+        if (kill(- job->pgrp, SIGCONT) < 0)
+                perror_msg("kill (SIGCONT)");
+
         return EXIT_SUCCESS;
 }
 
@@ -1081,7 +1083,7 @@ static void insert_job(struct job *newjob, int inbg)
 
                 /* move the new process group into the foreground */
                 /* suppress messages when run from /linuxrc mag@sysgo.de */
-                if (tcsetpgrp(0, newjob->pgrp) && errno != ENOTTY)
+                if (tcsetpgrp(shell_terminal, newjob->pgrp) && errno != ENOTTY)
                         perror_msg("tcsetpgrp");
         }
 }
@@ -1131,7 +1133,13 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
                 }
 
                 if (!(child->pid = fork())) {
+                        /* Set the handling for job control signals back to the default.  */
+                        signal(SIGINT, SIG_DFL);
+                        signal(SIGQUIT, SIG_DFL);
+                        signal(SIGTSTP, SIG_DFL);
+                        signal(SIGTTIN, SIG_DFL);
                         signal(SIGTTOU, SIG_DFL);
+                        signal(SIGCHLD, SIG_DFL);
 
                         close_all();
 
@@ -1192,14 +1200,10 @@ static int busy_loop(FILE * input)
         newjob.job_context = DEFAULT_CONTEXT;
 
         /* save current owner of TTY so we can restore it on exit */
-        parent_pgrp = tcgetpgrp(0);
+        parent_pgrp = tcgetpgrp(shell_terminal);
 
         command = (char *) xcalloc(BUFSIZ, sizeof(char));
 
-        /* don't pay any attention to this signal; it just confuses 
-           things and isn't really meant for shells anyway */
-        signal(SIGTTOU, SIG_IGN);
-
         while (1) {
                 if (!job_list.fg) {
                         /* no job is in the foreground */
@@ -1266,7 +1270,7 @@ static int busy_loop(FILE * input)
                         if (!job_list.fg) {
                                 /* move the shell to the foreground */
                                 /* suppress messages when run from /linuxrc mag@sysgo.de */
-                                if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY)
+                                if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
                                         perror_msg("tcsetpgrp"); 
                         }
                 }
@@ -1274,7 +1278,7 @@ static int busy_loop(FILE * input)
         free(command);
 
         /* return controlling TTY back to parent process group before exiting */
-        if (tcsetpgrp(0, parent_pgrp))
+        if (tcsetpgrp(shell_terminal, parent_pgrp))
                 perror_msg("tcsetpgrp");
 
         /* return exit status if called with "-c" */
@@ -1300,6 +1304,32 @@ void free_memory(void)
 }
 #endif
 
+/* Make sure we have a controlling tty.  If we get started under a job
+ * aware app (like bash for example), make sure we are now in charge so
+ * we don't fight over who gets the foreground */
+static void setup_job_control()
+{
+        /* Loop until we are in the foreground.  */
+        while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
+                kill (- shell_pgrp, SIGTTIN);
+
+        /* Ignore interactive and job-control signals.  */
+        signal(SIGINT, SIG_IGN);
+        signal(SIGQUIT, SIG_IGN);
+        signal(SIGTSTP, SIG_IGN);
+        signal(SIGTTIN, SIG_IGN);
+        signal(SIGTTOU, SIG_IGN);
+        signal(SIGCHLD, SIG_IGN);
+
+        /* Put ourselves in our own process group.  */
+        shell_pgrp = getpid ();
+        if (setpgid (shell_pgrp, shell_pgrp) < 0) {
+                perror_msg_and_die("Couldn't put the shell in its own process group");
+        }
+
+        /* Grab control of the terminal.  */
+        tcsetpgrp(shell_terminal, shell_pgrp);
+}
 
 int shell_main(int argc_l, char **argv_l)
 {
@@ -1359,6 +1389,7 @@ int shell_main(int argc_l, char **argv_l)
                         isatty(fileno(stdin)) && isatty(fileno(stdout))) {
                 interactive=TRUE;
         }
+        setup_job_control();
         if (interactive==TRUE) {
                 //printf( "optind=%d  argv[optind]='%s'\n", optind, argv[optind]);
                 /* Looks like they want an interactive shell */