POTD skeleton #23.

Signed-off-by: lns <matzeton@googlemail.com>

1 files changed, 26 insertions, 5 deletions

diff --git a/src/jail.c b/src/jail.c
index cd8189a..6e6c6ab 100644
--- a/src/jail.c
+++ b/src/jail.c
@@ -1,11 +1,15 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <sched.h>
+#include <signal.h>
 #include <assert.h>
 
 #include "jail.h"
 
+static int jail_childfn(void *arg);
 
-int jail_init(jail_ctx **ctx, size_t stacksize)
+
+void jail_init(jail_ctx **ctx, size_t stacksize)
 {
     assert(ctx);
     if (stacksize > BUFSIZ)
@@ -15,18 +19,35 @@ int jail_init(jail_ctx **ctx, size_t stacksize)
     assert(*ctx);
 
     (*ctx)->stacksize = stacksize;
-    (*ctx)->stack_ptr =
-        (unsigned char *) calloc(1, (*ctx)->stacksize)
+    (*ctx)->stack_ptr = calloc(1, (*ctx)->stacksize);
+    (*ctx)->stack_beg =
+        (unsigned char *) (*ctx)->stack_ptr
             + (*ctx)->stacksize;
-
-    return 0;
 }
 
 void jail_free(jail_ctx **ctx)
 {
+    free((*ctx)->stack_ptr);
+    free(*ctx);
+    *ctx = NULL;
 }
 
 int jail_fork(jail_ctx *ctx)
 {
+    int clone_flags = CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC|
+        CLONE_NEWNS|CLONE_NEWNET;
+
+    assert(ctx);
+    ctx->jail_pid = clone(jail_childfn, ctx->stack_beg,
+        SIGCHLD|clone_flags, ctx);
+
+    return ctx->jail_pid < 0;
+}
+
+static int jail_childfn(void *arg)
+{
+    FILE *log = fopen("./test.log", "wb");
+    fprintf(log, "---> CHILD FN <----\n");
+    sleep(200);
     return 0;
 }