1 files changed, 66 insertions, 0 deletions
diff --git a/src/cmd/rc/main.c b/src/cmd/rc/main.c
new file mode 100644
index 0000000..2c0aa42
--- /dev/null
+++ b/src/cmd/rc/main.c
@@ -0,0 +1,66 @@
+#include "rc.h"
+#include "parse.h"
+#include "exec.h"
+
+#include <signal.h>
+#include <termios.h>
+
+// -----------------------------------------------------------------------
+// globals
+
+Thread *runner = nil;
+Shell shell    = { 0 };
+
+// -----------------------------------------------------------------------
+// functions
+
+void
+initshell(void)
+{
+    if((shell.interactive=isatty(0))){
+        while(tcgetpgrp(0) != (shell.pid = getpgrp()))
+            kill(-shell.pid, SIGTTIN);
+
+        /* ignore job control signals */
+        signal(SIGINT,  SIG_IGN);
+        signal(SIGQUIT, SIG_IGN);
+        signal(SIGTSTP, SIG_IGN);
+        signal(SIGTTIN, SIG_IGN);
+        signal(SIGTTOU, SIG_IGN);
+        /* 
+         * NOTE: if SIGCHLD is set to SIG_IGN then
+         *  1. children that terminate do not become zombies
+         *  2. call a to wait() will block until all children have terminated
+         *  3. the call to wait will fail with errno == ECHILD
+         *  see for discussion:
+         *      https://stackoverflow.com/questions/1608017/no-child-process-error-from-waitpid-when-waiting-for-process-group 
+         */
+        // signal(SIGCHLD, SIG_IGN);
+
+        /* take control */
+        shell.pid = getpid();
+        if(setpgid(shell.pid, shell.pid)<0)
+            fatal("could not put shell in its own process group");
+
+        tcsetpgrp(shell.pid, shell.pid);
+    }
+}
+
+// -----------------------------------------------------------------------
+// main point of entry
+
+int
+main(int argc, char *argv[])
+{
+    shell.err = openfd(2);
+
+    initenv();
+    initpath();
+    initkeywords();
+    initshell();
+    inithistory();
+
+    enablevi();
+    xboot(argc, argv);
+    /* unreachable */
+}