#OSLAB #CS 17L2 NETWORKS AND OPERATING SYSTEMS LABORATORY
##CYCLE I ###Expt No:1
####STUDY OF SYSTEM CALLS
AIM: To study the system calls – create(), open(), read(), write(), close(), sleep(), exit(), unlink(), kill(), getpid(), getppid(), getuid(), getgid(), geteuid(), getegid(), fork(), system(), pipe(), mknod(), execl(), wait(),socket()
creat() system call
<Header files, syntax and description>
open() system call
<Header files, syntax and description>
read() system call
<Header files, syntax and description>
write() system call
<Header files, syntax and description>
close() system call
<Header files, syntax and description>
sleep() system call
<Header files, syntax and description>
exit() system call
<Header files, syntax and description>
unlink() system call
<Header files, syntax and description>
kill() system call
<Header files, syntax and description>
####Program No: (i): To get the process id, parent process id, real user id, real group id, effective user id, effective group id.
<Header files, syntax and description of getpid(), getppid(), getuid(), getgid(), geteuid(), getegid()>
Program, Execution Steps, Output
Case 1: Same real user and effective user
Case 2: Different real user and effective user
####Program No: (ii):
Familiarization of fork() system call
<Header files, syntax and description>
Program, Execution Steps, Output
####Program No: (iii): Familiarization of system() system call
<Header files, syntax and description>
Program, Execution Steps, Output
####Program No: (iv): Familiarization of pipe() system call
<Header files, syntax and description>
Program, Execution Steps, Output
####Program No: (v): To create a FIFO (named pipe)
<Header files, syntax and description>
Program, Execution Steps, Output
####Program No: (vi): Familiarization of execl() system call
<Header files, syntax and description>
Program, Execution Steps, Output
####Program No: (vii): Familiarization of wait() system call
<Header files, syntax and description>
Program, Execution Steps, Output
Case 1: Executing without wait system call
Case 2: Executing with wait system call
####Program No: (viii): Familiarization of socket() system call
<Header files, syntax and description>
Program, Execution Steps, Output
##Expt No:2 ##FILE TYPE AIM: To print the type of a given file
<Header files, syntax and description>
Program, Execution steps, Output for regular file, character special file, block special file, directory, fifo, symbolic link, socket
##Expt No:2 ##FILE ATTRIBUTES AIM: To accept a file name from the keyboard and display the following attributes of the file
a) Access permissions b) i-node number c)Time of last file access d) Time of last file modification e) File Size
<Header files, syntax and description>
Program, Execution steps, Output
##Expt No:2
##STUDY OF SIGNALS
AIM: To study the signals – SIGINT, SIGCLD, SIGQUIT,SIGALRM
<Header files, syntax and description>
Program, Execution steps
Output
Case 1: While pressing Ctrl + C
Case 2: While pressing Ctrl + /
Case 3: Without pressing Ctrl + C & Ctrl + /