Answer / wizards

read and write

Answer / havefun

read and write are the most commonly used system calls for
doing I/O.
Apart from them you can use lseek() to read from a specific
offset from a file.

In general, if you want to find how system calls work,
please visit my blog
http://havefunwhileulearn.blogspot.com/2010/03/systems-
calls.html

Answer / soniya gupta

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.

Answer / it brat

fork()
sleep()
wait()
exec()

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