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These system calls perform basic input/output operations on SCO OpenServer system files.
File and device I/O functions
| open | open a file for reading or writing |
| creat | create a new file or rewrite an existing one |
| close | close a file descriptor |
| read write | transfer data from/onto a file or device |
| getmsg putmsg | get/put message from/onto a stream |
| lseek | move file I/O pointer |
| fcntl | file I/O control |
| ioctl | device I/O control |