ADV *NIX SYSTEM CALLS

Question 1

Provide the system calls used for process control as defined below:

Answer 1

fork
execve
kill
exit
wait

Question 2

Creates a child process in the image of the parent process.

Answer 2

fork

Question 3

Executes the program pointed to by the file name.

Answer 3

execve

Question 4

Sends a sig another process to terminate it.

Answer 4

kill

Question 5

Terminates current process and performs a cleanup afterwards.

Answer 5

exit

Question 6

Blocks calling process until its child process exits or signal is received.

Answer 6

wait

Question 7

Provide the system calls used for file and device management as defined below:

Answer 7

open
ioctl
creat
read
write
close

Question 8

Open an existing file or device.

Answer 8

open

Question 9

Input or output control of device-specific operations.

Answer 9

ioctl

Question 10

Create and open a file.

Answer 10

creat

Question 11

Read data from a file or device.

Answer 11

read

Question 12

Write data to a file or device.

Answer 12

write

Question 13

Close all files associated with a terminating process.

Answer 13

close

Question 14

Provide the system calls used for information management as defined below:

Answer 14

getpid

uname

Question 15

Returns the PID of the calling process.

Answer 15

getpid

Question 16

Returns system information pertaining to the platform.

Answer 16

uname

Question 17

Provide the system calls used for communication as defined below:

Answer 17

mmap

pipe

Question 18

Creates a map in the virtual address space of the calling process.

Answer 18

mmap

Question 19

Creates a uni-directional data channel that can be used for Inter-Process Communication (IPC).

Answer 19

pipe

Question 20

Provide the system calls used for protection as defined below:

Answer 20

umask

chmod

Question 21

Sets the calling process’ file mode creation mask (umask).

Answer 21

umask

Question 22

Changes the file’s mode bits (permissions).

Answer 22

chmod