[PATCH 2/5] added config item USE_BB_THREADSAFE_SHADOW

[manuel.f.zerpies at ww.stud.uni-erlangen.de]

From: Manuel Zerpies <manuel.f.zerpies at ww.stud.uni-erlangen.de>

now it is possible to force busybox to use the threadsafe version
of the shadow password implementation.
---
 libpwdgrp/pwd_grp.c   |    2 --
 loginutils/Config.src |   20 ++++++++++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/libpwdgrp/pwd_grp.c b/libpwdgrp/pwd_grp.c
index edf53f3..9b2637d 100644
--- a/libpwdgrp/pwd_grp.c
+++ b/libpwdgrp/pwd_grp.c
@@ -370,8 +370,6 @@ struct spwd *getspnam(const char *name)
 
 /**********************************************************************/
 
-/* FIXME: we don't have such CONFIG_xx - ?! */
-
 #if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
 static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
 # define LOCK		pthread_mutex_lock(&mylock)
diff --git a/loginutils/Config.src b/loginutils/Config.src
index 9bf79af..e41548e 100644
--- a/loginutils/Config.src
+++ b/loginutils/Config.src
@@ -59,6 +59,26 @@ config USE_BB_SHADOW
 	  able to use PAM to access shadow passwords from remote LDAP
 	  password servers and whatnot.
 
+config USE_BB_THREADSAFE_SHADOW
+	bool "threadsafe shadow"
+	default y
+	depends on USE_BB_PWD_GRP && FEATURE_SHADOWPASSWDS
+	help
+	  This is the threadsafe version of USE_BB_SHADOW.
+	  If you leave this disabled, busybox will use the system's shadow
+	  password handling functions. And if you are using the GNU C library
+	  (glibc), you will then need to install the /etc/nsswitch.conf
+	  configuration file and the required /lib/libnss_* libraries in
+	  order for the shadow password functions to work. This generally
+	  makes your embedded system quite a bit larger.
+
+	  Enabling this option will cause busybox to directly access the
+	  system's /etc/shadow file when handling shadow passwords. This
+	  makes your system smaller (and I will get fewer emails asking about
+	  how glibc NSS works). When this option is enabled, you will not be
+	  able to use PAM to access shadow passwords from remote LDAP
+	  password servers and whatnot.
+
 config USE_BB_CRYPT
 	bool "Use internal crypt functions"
 	default y
-- 
1.7.9.5