util: Add open_in_ns() helper

Most of our helpers which need to enter the pasta network namespace are
quite specialised.  Add one which is rather general - it just open()s a
given file in the namespace context and returns the fd back to the main
namespace.  This will have some future uses.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/util.h b/util.h
index 9effc54..78a8fb2 100644
--- a/util.h
+++ b/util.h
@@ -219,6 +219,7 @@ int bitmap_isset(const uint8_t *map, int bit);
 char *line_read(char *buf, size_t len, int fd);
 void ns_enter(const struct ctx *c);
 bool ns_is_init(void);
+int open_in_ns(const struct ctx *c, const char *path, int flags);
 void write_pidfile(int fd, pid_t pid);
 int __daemon(int pidfile_fd, int devnull_fd);
 int fls(unsigned long x);