| Level | Operation |
| System | open, close, creat, write, read, lseek, pread, pwrite, dup, dup2, fsync, fdatasync, sync, fcntl, ioctl, stat, fstat, lstat, access, umask, chmod, fchmod, chown, fchown, lchown, truncate, ftruncate, link, unlink, symlink, readlink, utime |
| C | remove, rename, printf, puts, scanf, fscanf, vscanf, vfscanf, fflush, __isoc99_scanf, __isoc99_fscanf, __isoc99_vfscanf, fwide, setbuf, __isoc99_vscanf, set-vbuf, fopen, freopen, fdopen, fclose, getc, fgetc, getchar, ferror, feof, clearerr, ungetc, putc, fputc, putchar, fgets, gets, fputs, perror, fread, fwrite, ftell, fseek, rewind, ftello, fseeko, fgetpos, fsetpos, fprintf, vprintf, vfprintf, fscanf, vscanf, vfscanf, fileno, tmpfile, mkstemp |
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