commit 262b873dea75422c88739a5b1645edb1de638ddf
author Maciej Żenczykowski <maze@google.com> Thu Jan 20 14:56:20 2022 -0800
committer Maciej Żenczykowski <maze@google.com> Thu Apr 21 07:09:55 2022 -0700
tree 6afa848869dbf1890c16ce50364a9eaa3bfacbdf
parent 3e25f8272f59da66b7b161bff9649879f2cc1f48

posix_spawn - implement support for POSIX_SPAWN_CLOEXEC_DEFAULT

This new posix_spawn attribute flag marks all file descriptors
(except stdin/out/err) as close-on-exec before executing any user
registered file actions (posix_spawn_file_actions_addopen/adddup2).

Test: TreeHugger
Bug: 229913920
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If458100d6a253a9b0348d4e93a9a610225f89615

libc/include/spawn.h

diff --git a/libc/include/spawn.h b/libc/include/spawn.h
index 2e239bf..e445453 100644
--- a/libc/include/spawn.h
+++ b/libc/include/spawn.h
@@ -46,6 +46,8 @@
 #define POSIX_SPAWN_USEVFORK 64
 #define POSIX_SPAWN_SETSID 128
 #endif
+// mark all fds (except stdin/out/err) as close-on-exec prior to executing registered file actions
+#define POSIX_SPAWN_CLOEXEC_DEFAULT 256
 
 typedef struct __posix_spawnattr* posix_spawnattr_t;
 typedef struct __posix_spawn_file_actions* posix_spawn_file_actions_t;