Add linux libspl support

[zfs.git] / lib / libspl / getexecname.c

diff --git a/lib/libspl/getexecname.c b/lib/libspl/getexecname.c
new file mode 100644 (file)
index 0000000..c564eed
--- /dev/null
+++ b/lib/libspl/getexecname.c
@@ -0,0 +1,57 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <limits.h>
+
+const char *
+getexecname(void)
+{
+       static char execname[PATH_MAX + 1] = "";
+       static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
+       char *ptr = NULL;
+       ssize_t rc;
+
+       pthread_mutex_lock(&mtx);
+
+       if (strlen(execname) == 0) {
+               rc = readlink("/proc/self/exe", execname, sizeof(execname) - 1);
+               if (rc == -1) {
+                       execname[0] = '\0';
+               } else {
+                       execname[rc] = '\0';
+                       ptr = execname;
+               }
+       } else {
+               ptr = execname;
+       }
+
+       pthread_mutex_unlock(&mtx);
+       return ptr;
+}