On Sat, Nov 10, 2018 at 11:06:45AM -0800, Daniel Colascione wrote: > Reminds me of LSS: https://chromium.googlesource.com/linux-syscall-support/ Interesting, thanks for the link, I would probably not have started mine had I known this one :-) > I'm not a fan of this approach for general-purpose use. There's value > in having *some* common function-level indirection before actually > issuing system calls, e.g., for LD_PRELOAD stuff. I'm not speaking about general purpose replacement but more about general purpose low level functions that glibc wrappers can safely use and expose by default. This way general purpose applications would still use glibc and those willing to use a lower level could do it more easily by accessing the lower layer, without having to define their own syscalls. If I could do something like this in my code : #ifndef HAVE_SYSCALL_SPLICE // exposed by glibc # ifdef __linux_splice // exposed by kernel header # define splice __linux_splice # else # error "no splice exposed by either libc or kernel headers" # endif #endif It would be easier, safer and cleaner than what I've used to do before : #if !defined(HAVE_SYSCALL_SPLICE) && defined(__NR_splice) static inline _syscall6(int, splice, int, fdin, loff_t *, off_in, int, fdout, loff_t *, off_out, size_t, len, unsigned long, flags); #endif Willy
