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[thirdparty/glibc.git] / sysdeps / posix / truncate.c

diff --git a/sysdeps/posix/truncate.c b/sysdeps/posix/truncate.c
index 4f4c07e1df97d27965b076a2be81b40d8fbe713c..614415a63752821b09cf2984dea225be8007744d 100644 (file)
--- a/sysdeps/posix/truncate.c
+++ b/sysdeps/posix/truncate.c
@@ -1,22 +1,21 @@
-/* Copyright (C) 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Truncate a file given by name.  Generic POSIX.1 version.
+   Copyright (C) 1995-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
 
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+   The GNU C 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; either
+   version 2.1 of the License, or (at your option) any later version.
 
-The GNU C 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
-Library General Public License for more details.
+   The GNU C 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 Library General Public
-License along with the GNU C Library; see the file COPYING.LIB.  If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA.  */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
 
-#include <ansidecl.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <unistd.h>
@@ -24,19 +23,22 @@ Cambridge, MA 02139, USA.  */
 
 /* Truncate PATH to LENGTH bytes.  */
 int
-DEFUN(truncate, (path, length),
-      CONST char *path AND off_t length)
+__truncate (const char *path, off_t length)
 {
   int fd, ret, save;
 
-  fd = open (path, O_WRONLY);
+  fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0));
   if (fd < 0)
     return -1;
 
-  ret = ftruncate (fd, length);
+  if (length == 0)
+    ret = 0;
+  else
+    ret = __ftruncate (fd, length);
   save = errno;
-  (void) close (fd);
+  (void) __close (fd);
   if (ret < 0)
-    errno = save;
+    __set_errno (save);
   return ret;
 }
+weak_alias (__truncate, truncate)