From 431fc6465d32db324360e947bb55cf972e85cf84 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Tue, 10 Sep 2002 05:53:30 +0000
Subject: Fix some locking problems noted by Manuel.  __getgrent() was always
 called under lock, but the callers did not share the same locks...  -Erik

---
 libc/pwd_grp/__getgrent.c | 10 ++++------
 libc/pwd_grp/fgetgrent.c  |  7 ++++---
 libc/pwd_grp/getgrgid.c   |  6 +++---
 libc/pwd_grp/getgrnam.c   |  6 +++---
 libc/pwd_grp/grent.c      | 14 +++++++++++++-
 libc/pwd_grp/initgroups.c | 10 +++++-----
 6 files changed, 32 insertions(+), 21 deletions(-)

diff --git a/libc/pwd_grp/__getgrent.c b/libc/pwd_grp/__getgrent.c
index 393c42de1..b896a976a 100644
--- a/libc/pwd_grp/__getgrent.c
+++ b/libc/pwd_grp/__getgrent.c
@@ -24,14 +24,12 @@
 #include <string.h>
 #include "config.h"
 
+
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK   pthread_mutex_lock(&mylock)
-# define UNLOCK pthread_mutex_unlock(&mylock);
-#else
-# define LOCK
-# define UNLOCK
+/* This function should always be called under lock, so we
+ * do not lock things in here... */
+pthread_mutex_t __getgrent_lock = PTHREAD_MUTEX_INITIALIZER;
 #endif
 
 /*
diff --git a/libc/pwd_grp/fgetgrent.c b/libc/pwd_grp/fgetgrent.c
index b99df1c77..2c7917601 100644
--- a/libc/pwd_grp/fgetgrent.c
+++ b/libc/pwd_grp/fgetgrent.c
@@ -24,13 +24,14 @@
     
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK   pthread_mutex_lock(&mylock)
-# define UNLOCK pthread_mutex_unlock(&mylock);
+extern pthread_mutex_t __getgrent_lock;
+# define LOCK   pthread_mutex_lock(&__getgrent_lock)
+# define UNLOCK pthread_mutex_unlock(&__getgrent_lock);
 #else
 # define LOCK
 # define UNLOCK
 #endif
+
 static char *line_buff = NULL;
 static char **members = NULL;
 
diff --git a/libc/pwd_grp/getgrgid.c b/libc/pwd_grp/getgrgid.c
index 5efca964a..3575a749b 100644
--- a/libc/pwd_grp/getgrgid.c
+++ b/libc/pwd_grp/getgrgid.c
@@ -27,9 +27,9 @@
 
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK   pthread_mutex_lock(&mylock)
-# define UNLOCK pthread_mutex_unlock(&mylock);
+extern pthread_mutex_t __getgrent_lock;
+# define LOCK   pthread_mutex_lock(&__getgrent_lock)
+# define UNLOCK pthread_mutex_unlock(&__getgrent_lock);
 #else
 # define LOCK
 # define UNLOCK
diff --git a/libc/pwd_grp/getgrnam.c b/libc/pwd_grp/getgrnam.c
index 10302aab2..2c8d030e0 100644
--- a/libc/pwd_grp/getgrnam.c
+++ b/libc/pwd_grp/getgrnam.c
@@ -27,9 +27,9 @@
 
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK   pthread_mutex_lock(&mylock)
-# define UNLOCK pthread_mutex_unlock(&mylock);
+extern pthread_mutex_t __getgrent_lock;
+# define LOCK   pthread_mutex_lock(&__getgrent_lock)
+# define UNLOCK pthread_mutex_unlock(&__getgrent_lock);
 #else
 # define LOCK
 # define UNLOCK
diff --git a/libc/pwd_grp/grent.c b/libc/pwd_grp/grent.c
index 587fe0d93..9418ea937 100644
--- a/libc/pwd_grp/grent.c
+++ b/libc/pwd_grp/grent.c
@@ -40,6 +40,16 @@ static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
 # define UNLOCK
 #endif      
 
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __getgrent_lock;
+# define GRENT_LOCK   pthread_mutex_lock(&__getgrent_lock)
+# define GRENT_UNLOCK pthread_mutex_unlock(&__getgrent_lock);
+#else
+# define GRENT_LOCK
+# define GRENT_UNLOCK
+#endif
+
 static int grp_fd = -1;
 static char *line_buff = NULL;
 static char **members = NULL;
@@ -71,7 +81,9 @@ struct group *getgrent(void)
 	UNLOCK;
 	return NULL;
     }
-    r = __getgrent(grp_fd, line_buff, members);
     UNLOCK;
+    GRENT_LOCK;
+    r = __getgrent(grp_fd, line_buff, members);
+    GRENT_UNLOCK;
     return r;
 }
diff --git a/libc/pwd_grp/initgroups.c b/libc/pwd_grp/initgroups.c
index 1596298e8..84ead9c55 100644
--- a/libc/pwd_grp/initgroups.c
+++ b/libc/pwd_grp/initgroups.c
@@ -27,13 +27,13 @@
 
 #ifdef __UCLIBC_HAS_THREADS__
 #include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-# define LOCK   pthread_mutex_lock(&mylock)
-# define UNLOCK pthread_mutex_unlock(&mylock);
-#else       
+extern pthread_mutex_t __getgrent_lock;
+# define LOCK   pthread_mutex_lock(&__getgrent_lock)
+# define UNLOCK pthread_mutex_unlock(&__getgrent_lock);
+#else
 # define LOCK
 # define UNLOCK
-#endif      
+#endif
 
 static char *line_buff = NULL;
 static char **members = NULL;
-- 
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