Author: jilles Date: Thu May 9 21:29:13 2013 New Revision: 250421 URL: http://svnweb.freebsd.org/changeset/base/250421
Log: posix_spawn_file_actions_adddup2(3): Document difference with dup2(). The ability to clear a file descriptor's close-on-exec flag via posix_spawn_file_actions_adddup2() is in fact proposed in Austin Group issue #411. MFC after: 1 week Modified: head/lib/libc/gen/posix_spawn_file_actions_addopen.3 Modified: head/lib/libc/gen/posix_spawn_file_actions_addopen.3 ============================================================================== --- head/lib/libc/gen/posix_spawn_file_actions_addopen.3 Thu May 9 20:13:43 2013 (r250420) +++ head/lib/libc/gen/posix_spawn_file_actions_addopen.3 Thu May 9 21:29:13 2013 (r250421) @@ -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 , _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
