HelenOS sources

VFS_OUT_FSPROBE    96 uspace/lib/c/include/ipc/vfs.h 	VFS_OUT_FSPROBE,
VFS_OUT_FSPROBE    96 uspace/lib/posix/include/libc/ipc/vfs.h 	VFS_OUT_FSPROBE,
HelenOS homepage, sources at GitHub