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-rw-r--r--CODING_STYLE7
1 files changed, 7 insertions, 0 deletions
diff --git a/CODING_STYLE b/CODING_STYLE
index 1748dc4bc4..feb1a9dd67 100644
--- a/CODING_STYLE
+++ b/CODING_STYLE
@@ -232,3 +232,10 @@
"return" to exit from the main function of a process. If you
fork()ed off a child process, please use _exit() instead of exit(),
so that the exit handlers are not run.
+
+- Please never use dup(). Use fcntl(fd, F_DUPFD_CLOEXEC, 3)
+ instead. For two reason: first, you want O_CLOEXEC set on the new fd
+ (see above). Second, dup() will happily duplicate your fd as 0, 1,
+ 2, i.e. stdin, stdout, stderr, should those fds be closed. Given the
+ special semantics of those fds, it's probably a good idea to avoid
+ them. F_DUPFD_CLOEXEC with "3" as parameter avoids them.