Question
What are the Unix system calls for I/O?
Answers
– open(pathname,flag,mode) – open file
– creat(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.   Your Comment




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