What are the Unix system calls for I/O?

Answer Posted / 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.

Is This Answer Correct ?    5 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What is the fork() system call?

730


What are the possible return values of kill() system call?

658


Explain the mount system calls?

746


What is the difference between command and utility in unix?

668


Explain the mount and unmount system calls?

741


Explain c program to implement the unix or linux command to implement ls -l >output.txt?

599


The very first process created by the kernel in unix is?

645


Name the command which is used to execute system calls from exe?

711


How to protect a process from others to kill?

698


Tell me how to protect a process from others to kill?

655


Explain the difference between command and utility in unix?

670


What is the first process created by the kernel in unix?

628


Explain the unmount system calls?

699