tools/lxc_unshare: satisfy Android

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/tools/lxc_unshare.c b/src/lxc/tools/lxc_unshare.c
index 98143d66231cdb81620641fe9587e39a8b51d0db..54f0fd545fa34be479be92217404776bf783566c 100644 (file)
--- a/src/lxc/tools/lxc_unshare.c
+++ b/src/lxc/tools/lxc_unshare.c
@@ -42,6 +42,23 @@
 #include "arguments.h"
 #include "tool_utils.h"
 
+/* Define sethostname() if missing from the C library also workaround some
+ * quirky with having this defined in multiple places.
+ */
+static inline int sethostname_including_android(const char *name, size_t len)
+{
+#ifndef HAVE_SETHOSTNAME
+#ifdef __NR_sethostname
+       return syscall(__NR_sethostname, name, len);
+#else
+       errno = ENOSYS;
+       return -1;
+#endif
+#else
+       return sethostname(name, len);
+#endif
+}
+
 struct my_iflist
 {
        char *mi_ifname;
@@ -127,7 +144,7 @@ static int do_start(void *arg)
                lxc_setup_fs();
 
        if ((flags & CLONE_NEWUTS) && want_hostname)
-               if (sethostname(want_hostname, strlen(want_hostname)) < 0) {
+               if (sethostname_including_android(want_hostname, strlen(want_hostname)) < 0) {
                        fprintf(stderr, "failed to set hostname %s: %s\n", want_hostname, strerror(errno));
                        exit(EXIT_FAILURE);
                }