diff options
| -rw-r--r-- | lib/libc/gen/posix_spawn_file_actions_addopen.3 | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/lib/libc/gen/posix_spawn_file_actions_addopen.3 b/lib/libc/gen/posix_spawn_file_actions_addopen.3 index e01b497..c466578 100644 --- a/lib/libc/gen/posix_spawn_file_actions_addopen.3 +++ b/lib/libc/gen/posix_spawn_file_actions_addopen.3 @@ -123,7 +123,19 @@ to be duplicated as dup2(fildes, newfildes) .Ed .Pp -had been called) when a new process is spawned using this file actions object. +had been called) when a new process is spawned using this file actions object, +except that the +.Dv FD_CLOEXEC +flag for +.Fa newfildes +is cleared even if +.Fa fildes +is equal to +.Fa newfildes . +The difference from +.Fn dup2 +is useful for passing a particular file descriptor +to a particular child process. .Pp The .Fn posix_spawn_file_actions_addclose @@ -169,7 +181,16 @@ The and .Fn posix_spawn_file_actions_addclose functions conform to -.St -p1003.1-2001 . +.St -p1003.1-2001 , +with the exception of the behavior of +.Fn posix_spawn_file_actions_adddup2 +if +.Fa fildes +is equal to +.Fa newfildes +(clearing +.Dv FD_CLOEXEC ) . +A future update of the Standard is expected to require this behavior, .Sh HISTORY The .Fn posix_spawn_file_actions_addopen , |
