add directory bin

bin/doshell.c

@@ -0,0 +1,34 @@
+
+#include <stdio.h>
+#include <sys/file.h>
+#include <errno.h>
+
+extern char *sys_errlist[];
+
+main(int argc, char *argv[])
+{
+
+    if (argc != 3) {
+	fprintf(stderr, "usage: doshell <ttyname> <shellname> &\n");
+	exit(1);
+    }
+
+    /* close down fd's */
+    close(0);
+    close(1);
+    close(2);
+
+    /* detach from parent process's group */
+    setsid();
+
+    /* open new tty */
+    if (open(argv[1], O_RDWR, 0) == -1)
+	exit(2);
+    dup(0);
+    dup(0);
+    execlp(argv[2], "-", 0);
+    /* should appear on new tty...: */
+    fprintf(stderr, "can't exec shell: %s\n", sys_errlist[errno]);
+    exit(3);
+}
+