Add userspace namespace contexts

[lttng-ust.git] / liblttng-ust-fork / ustfork.c

diff --git a/liblttng-ust-fork/ustfork.c b/liblttng-ust-fork/ustfork.c
index 71c4b86c1189ff7f89e1f7edba541c5d69d98df5..25f9d4cc04c31d2589e36d148684bf61d846c5aa 100644 (file)
--- a/liblttng-ust-fork/ustfork.c
+++ b/liblttng-ust-fork/ustfork.c
@@ -160,6 +160,56 @@ int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...)
        return retval;
 }
 
+int setns(int fd, int nstype)
+{
+       static int (*plibc_func)(int fd, int nstype) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setns");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setns\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setns */
+       retval = plibc_func(fd, nstype);
+       saved_errno = errno;
+
+       ust_after_setns();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int unshare(int flags)
+{
+       static int (*plibc_func)(int flags) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "unshare");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"unshare\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setns */
+       retval = plibc_func(flags);
+       saved_errno = errno;
+
+       ust_after_unshare();
+
+       errno = saved_errno;
+       return retval;
+}
+
 #elif defined (__FreeBSD__)
 
 pid_t rfork(int flags)