X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=liblttng-ust%2Fgetenv.h;h=a5dffb24dc324fe5b08d7ce97d46a92f980abd84;hb=0c2f844420608b1865b77cff1e84ce01bb9e3937;hp=05864fb8eb39b5c79ef3cdae2e31118f9edf7165;hpb=730bf2af85afbd5557adac5e3283f3ad59e90194;p=lttng-ust.git

diff --git a/liblttng-ust/getenv.h b/liblttng-ust/getenv.h
index 05864fb8..a5dffb24 100644
--- a/liblttng-ust/getenv.h
+++ b/liblttng-ust/getenv.h
@@ -1,44 +1,25 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
 #ifndef _COMPAT_GETENV_H
 #define _COMPAT_GETENV_H
 
 /*
- * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Always add the lttng-ust environment variables using the lttng_ust_getenv()
+ * infrastructure rather than using getenv() directly.  This ensures that we
+ * don't trigger races between getenv() invoked by lttng-ust listener threads
+ * invoked concurrently with setenv() called by an otherwise single-threaded
+ * application thread. (the application is not aware that it runs with
+ * lttng-ust)
  */
 
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <usterr-signal-safe.h>
-
-static inline
-int lttng_is_setuid_setgid(void)
-{
-	return geteuid() != getuid() || getegid() != getgid();
-}
+__attribute__((visibility("hidden")))
+char *lttng_ust_getenv(const char *name);
 
-static inline
-char *lttng_secure_getenv(const char *name)
-{
-	if (lttng_is_setuid_setgid()) {
-		ERR("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.",
-			name);
-		return NULL;
-	}
-	return getenv(name);
-}
+__attribute__((visibility("hidden")))
+void lttng_ust_getenv_init(void);
 
 #endif /* _COMPAT_GETENV_H */