truncate: Make more robust in multithreaded applications.

* lib/truncate.c (truncate): Pass an O_CLOEXEC flag to open().

diff --git a/ChangeLog b/ChangeLog
index a3543f8a3139f6483fe7e744c9ac5b8d79da4434..7b837df3234f77952173ba3623a5694082378a5d 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2020-05-28  Bruno Haible  <bruno@clisp.org>
+
+       truncate: Make more robust in multithreaded applications.
+       * lib/truncate.c (truncate): Pass an O_CLOEXEC flag to open().
+
 2020-05-28  Bruno Haible  <bruno@clisp.org>
 
        pagealign_alloc: Make more robust in multithreaded applications.

diff --git a/lib/truncate.c b/lib/truncate.c
index 456f7aa486d11201785e6adc3b4d0cc9dcd5a203..b04f7c784155dfaa79080758201c7fe1bd04759a 100644 (file)
--- a/lib/truncate.c
+++ b/lib/truncate.c
@@ -29,13 +29,13 @@ truncate (const char *filename, off_t length)
 
   if (length == 0)
     {
-      fd = open (filename, O_WRONLY | O_TRUNC);
+      fd = open (filename, O_WRONLY | O_TRUNC | O_CLOEXEC);
       if (fd < 0)
         return -1;
     }
   else
     {
-      fd = open (filename, O_WRONLY);
+      fd = open (filename, O_WRONLY | O_CLOEXEC);
       if (fd < 0)
         return -1;
       if (ftruncate (fd, length) < 0)