Linux System Programming Code a C++ program, named processes.cpp that receives one argument, (i.e., argv[1]) upon its invocation and searches how many processes whose name is given in argv[1] are running on the system where your program has been invoked. To be specific, your program should demonstrate the same behavior as: $ ps -A | grep argv[1] | wc -l Implement processes using the following system calls: 1. pid_t fork( void ); creates a child process that differs from the parent process only in terms of their process IDs. 2. int execlp( const char *file, const char *arg, ..., (char *)0 ); replaces the current process image with a new process image that will be loaded from file. The first argument arg must be the same as file. The last argument is a NULL pointer of type “char *”. 3. int pipe( int filedes[2] ); creates a pair of file descriptors (which point to a pipe structure), and places them in the array pointed to by filedes. filedes[0] is for reading data from the pipe, filedes[1] is for writing data to the pipe. 4. int dup2( int oldfd, int newfd ); creates in newfd a copy of the file descriptor oldfd. 5. pid_t wait( int *status ); waits for process termination 6. int close( int fd ); closes a file descriptor. For more details, type the man command from the shell prompt line. Use only the system calls listed above. Do not use the system system call. Imitate how the shell performs "ps -A | grep argv[1] | wc -l". In other words, your parent process spawns a child that spawns a grand-child that spawns a great-grand-child. Each process should execute a different command as follows: Process Command Stdin Stdout Parent wait for a child no change no change Child wc -l redirected from a grand-child's stdout no change Grand-child grep argv[1] redirected from a great-grand-child's stdout redirected to a child's stdin Great-grand- child ps -A no change redirected to a grand-child's stdin 4. What to Turn In On Canvas Program 1 must include: 1. Softcopy: processes.cpp file 2. A sample of output when running your program vs. actual system calls (to be included in 3. Report):                 $ ./processes kworker $ ps -A | grep kworker | wc -l $ ./processes sshd $ ps -A | grep sshd | wc -l $ ./processes scsi $ ps -A | grep scsi | wc -l

Linux System Programming
Code a C++ program, named processes.cpp that receives one argument, (i.e., argv[1]) upon its
invocation and searches how many processes whose name is given in argv[1] are running on
the system where your program has been invoked. To be specific, your program should
demonstrate the same behavior as:
$ ps -A | grep argv[1] | wc -l
Implement processes using the following system calls:
1. pid_t fork( void ); creates a child process that differs from the parent process only in
terms of their process IDs.
2. int execlp( const char *file, const char *arg, ..., (char *)0 ); replaces the current
process image with a new process image that will be loaded from file. The first
argument arg must be the same as file. The last argument is a NULL pointer of type
“char *”.
3. int pipe( int filedes[2] ); creates a pair of file descriptors (which point to a pipe
structure), and places them in the array pointed to by filedes. filedes[0] is for reading
data from the pipe, filedes[1] is for writing data to the pipe.
4. int dup2( int oldfd, int newfd ); creates in newfd a copy of the file descriptor oldfd.
5. pid_t wait( int *status ); waits for process termination
6. int close( int fd ); closes a file descriptor.
For more details, type the man command from the shell prompt line. Use only the system calls
listed above. Do not use the system system call. Imitate how the shell performs "ps -A | grep
argv[1] | wc -l". In other words, your parent process spawns a child that spawns a grand-child
that spawns a great-grand-child. Each process should execute a different command as follows:
Process Command Stdin Stdout
Parent
wait for a
child no change no change
Child wc -l redirected from a grand-child's stdout no change
Grand-child grep argv[1]
redirected from a great-grand-child's
stdout redirected to a child's stdin
Great-grand-
child ps -A no change
redirected to a grand-child's
stdin
4. What to Turn In On Canvas
Program 1 must include:
1. Softcopy:
processes.cpp file
2. A sample of output when running your program vs. actual system calls (to be
included in 3. Report):

 

$ ./processes kworker
$ ps -A | grep kworker | wc -l
$ ./processes sshd
$ ps -A | grep sshd | wc -l
$ ./processes scsi
$ ps -A | grep scsi | wc -l