Merge branch 'master' into wait

Cargo.toml

src/lib.rs

tests/alloc.c

tests/args.c

tests/brk.c

tests/chdir.c

tests/dup.c

tests/error.c

tests/fchdir.c

tests/fcntl.c

tests/fsync.c

tests/ftruncate.c

tests/getid.c

tests/link.c

tests/math.c

tests/mem.c

tests/pipe.c

tests/rmdir.c

tests/setid.c

tests/sleep.c