Test the posix interface.
statfs file - Show the status of file system
statfs64 file - Show the status of file system
getdents directory - Show the files of directory
mkdir directory mode - Make new directory(mode is octonary)
access directory mode - Check the access mode(R_OK,W_OK,X_OK or F_OK) of directory
stat file - Show the status of file
fstat file - Show the status of file
rename file file - Rename the path/file
unlink file - Delete a file
open file flags - Open a file with flags
flags:O_RDONLY,O_WRONLY,O_RDWR,O_CLOEXEC,O_CREAT,
O_DIRECTORY,O_EXCL,O_NOCTTY,O_NOFOLLOW,
O_TMPFILE,and O_TRUNC
openmode file flags mode - Open a file with flags and mode
flags:according to open
openat directory file flags - Open a file at a directory with flags
flags:according to open
mmap file prot flags - Create a new mapping in the virtual address space
prot:PROT_EXEC,PROT_READ,PROT_WRITE and PROT_NONE
flags:MAP_SHARED,MAP_PRIVATE,MAP_32BIT,MAP_ANON,
MAP_FIXED,MAP_ANONYMOUS,MAP_LOCKED...
read file - Read a file
pread file - Read a file
write file context - Write context to a file
pwrite file context - Write context to a file
fsetxattr file name value - Set extended attributes of a file with name:value
fgetxattr file name - Get extended attributes of a file
fcntl file cmd - Perform the operations described of a file
cmd: O_APPEND, O_ASYNC, O_DIRECT, O_NOATIME and O_NONBLOCK
fcntllock file type - Lock a file.Type can be F_RDLCK, F_WRLCK, and F_UNLCK
lockf file cmd len - Lock a file.Cmd can be F_LOCK, F_TLOCK, F_ULOCK, and F_TEST
testall directory - Test all functions.Directory must be new.