Implement liblttng-ust-fd

[lttng-ust.git] / liblttng-ust-fd / lttng-ust-fd.c

diff --git a/liblttng-ust-fd/lttng-ust-fd.c b/liblttng-ust-fd/lttng-ust-fd.c
new file mode 100644 (file)
index 0000000..6a095db
--- /dev/null
+++ b/liblttng-ust-fd/lttng-ust-fd.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016  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; 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
+ */
+
+#define _GNU_SOURCE
+#define _LGPL_SOURCE
+#include <limits.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <ust-fd.h>
+#include <dlfcn.h>
+
+#include <helper.h>
+#include "usterr-signal-safe.h"
+
+volatile enum ust_loglevel ust_loglevel;
+
+static int (*__lttng_ust_fd_plibc_close)(int fd);
+
+static
+int _lttng_ust_fd_libc_close(int fd)
+{
+       if (!__lttng_ust_fd_plibc_close) {
+               __lttng_ust_fd_plibc_close = dlsym(RTLD_NEXT, "close");
+               if (!__lttng_ust_fd_plibc_close) {
+                       fprintf(stderr, "%s\n", dlerror());
+                       return -1;
+               }
+       }
+       return lttng_ust_safe_close_fd(fd, __lttng_ust_fd_plibc_close);
+}
+
+int close(int fd)
+{
+       return _lttng_ust_fd_libc_close(fd);
+}
+
+#if defined(__sun__) || defined(__FreeBSD__)
+/* Solaris and FreeBSD. */
+void closefrom(int lowfd)
+{
+       (void) lttng_ust_safe_closefrom(lowfd, __lttng_ust_fd_plibc_close);
+}
+#elif defined(__NetBSD__) || defined(__OpenBSD__)
+/* NetBSD and OpenBSD. */
+int closefrom(int lowfd)
+{
+       return lttng_ust_safe_closefrom(lowfd, __lttng_ust_fd_plibc_close);
+}
+#else
+/* As far as we know, this OS does not implement closefrom. */
+#endif