Unix%20Interview%20Questions%20and%20Answers
Question: What are the Unix system calls for I/O?Answer: open(pathname,flag,mode) - open filecreat(pathname,mode) - create file close(filedes) - close an open file read(filedes,buffer,bytes) - read data from an open file write(filedes,buffer,bytes) - write data to an open file lseek(filedes,offset,from) - position an open file dup(filedes) - duplicate an existing file descriptor dup2(oldfd,newfd) - duplicate to a desired file descriptor fcntl(filedes,cmd,arg) - change properties of an open file ioctl(filedes,request,arg) - change the behaviour of an open file The difference between fcntl anf ioctl is that the former is intended for any open file, while the latter is for device-specific operations. |
Is it helpful?
Yes
No
Most helpful rated by users:
- How are devices represented in UNIX?
- What is 'inode'?
- What difference between cmp and diff commands?
- Explain the steps that a shell follows while processing a command.
- Brief about the directory representation in UNIX