bash: Correct usage of F_SETFD

[Sukadev Bhattiprolu]

include/filecntl.h in bash-4.1 has following:

#define SET_CLOSE_ON_EXEC(fd)  (fcntl ((fd), F_SETFD, FD_CLOEXEC))

Is that really the correct/intended usage of F_SETFD ?

If kernel ever adds a new flag to the fd, this would end up clearing the
other new flag right ?

Shouldn't bash use F_GETFD to get the current flags and set/clear just
the FD_CLOEXEC bit ?

Sukadev