Some replies seem to hold openat() for superfluous. In fact, IMHO the traditional syscall open() should be deprecated.

In FreeBSD at least, the libc  open() does in fact use the real thing __sys_openat(). in /usr/src/lib/libc/sys/open.c
via the interposing table.

Some days ago, I experimented with a user space implementation of the of the file lookup in namei() to get the benefits of a  proc specific namespace on my FreeBSDsystem, making Plan9 style bind and mount  available. This involved changing every  slash in a path name into  openat() calls for the splltted path components. pkeus.de/~wb/ns.c

Btw, there is another syscall in FreeBSD, which overlaps open() and openat() , namely fhopen(). This seems to isolate the namespace lookup operation and the actual file access.


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