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Assignment 3  POSIX implementation

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CECS 326-01 Assignment 3 (10 points)

In this assignment you will make use of the POSIX implementation of the Linux shared memory

mechanism, and make use of the fork() and exec() system calls to create child processes and control the
program that a child process is to execute. For this assignment you need to write two C programs named
master.c and slave.c, which should be compiled into executables master and slave, respectively. Together
they should do the following:
When master executes, it should first output a message to identify itself. It should then request to create a
shared memory segment of a certain name xxxxx, followed by creating n child processes, where both
xxxxx and the number n are obtained from the commandline parameters. Each child process is to execute
slave, with its child number (i.e., 1, 2, etc.) and the shared memory segment name xxxxx passed to it from
the exec() system call. The master process should output the number of slaves it has created, and wait for
all of them to terminate. Upon receiving termination signals from all child processes, master then outputs
the content of the shared memory segment filled in by the slaves, removes the shared memory and then
exits.
The following header file that defines a C struct may be used to structure the shared memory segment:
/* myShm.h */
/* Header file to be used with master.c and slave.c
*/
struct CLASS {
int index; // index to next available response slot
int response[10]; // each child writes its child number here
};
Suppose program execution is launched as follows:
./master 3 my_shm_name
master should produce the following sequence of output:
Master begins execution
Master created a shared memory segment named my_shm_name [ my_shm_name is from comandline ]
Master created 3 child processes to execute slave [ The number 3 is from commandline]
Master waits for all child processes to terminate
Master received termination signals from all 3 child processes
Content of shared memory segment filled by child processes:
— content of shared memory — [ Show what child processes wrote ]
Master removed shared memory segment, and is exiting
When a child process executes slave, it should first output a message to identify itself, and show its child
number and the shared memory segment name it obtained from the exec() system call that invokes its
execution. It should then open the existing shared memory segment, acquire access to it, and write its
child number into the next available slot in the shared memory, close the shared memory and terminate.
slave should produce the following sequence of output:
Slave begins execution
I am child number x, received shared memory name my_shm_name
I have written my child number to shared memory
Slave closed access to shared memory and terminates
It should be noted that the display of the above sets of output may interleave.
The program must run successfully on Linux.
Do the following for this assignment:
1. Develop two C programs (master.c, and slave.c) that work as described above. Make sure your
source programs are properly formatted as well as adequately and clearly commented. Detailed
explanations on all system calls are required and must be in your own words. Simply copying
those from the man pages are not acceptable.
2. Submit on BeachBoard the two C programs, a screenshot that shows successful compile of both
programs as well as a successful run, and a cover page that provides your name, your student ID,
course # and section, assignment #, due date, submission date, and a clear program description
detailing what the programs are about. Format of the cover page should follow the cover page
template on BeachBoard. The programs must be properly formatted and adequately commented
to enhance readability and understanding. Detailed documentation on all system calls are
especially needed.

Assignment 3  POSIX implementation
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