System Calls
open()
open : This call opens or creates a file if not present.
creat()
creat : it creates a new file or rewrites an existing one
close()
close : It closes an open file, returns -1 in case of error.
read()
read: This is used to read a certain number of bytes starting from current position.
write()
write: This is used to write a certain number of bytes starting from current position.
lseek()
Lseek: This call is used to position a pointer in an absolute or relative way.
link()
Link: This call is used to link one file to another directory. I.e it changes the path of the file.
unlink()
Unlink: This call unlinks the link that was created.
access()
Access: This call checks whether the calling process can access the file pathname.
chmod()
Chmod: This system call modifies the access rights of a certain file.