![4 @author: student namel, student2@uncc.edu 5 author: student name2, student2@uncc.edu 7 @description: A program that demonstrates processes. 9 @course: ITSC 3146 10 @assignment: In-class activity [n] 12 13 14 #include<iostream> 15 #include«unistd.h> 16 17 int mainOl 18 19 20 21 pid_t id = fork(); if(id 1) { ) else if (id -- 0) std::cout <<Error creating process\n; std::cout <<I am a child process!n; std::cout <<I just became a parent!\n; 23 24 25 26 27 28 29 30 31 else return 0;](http://img.homeworklib.com/questions/2552a1a0-7b14-11eb-838e-23691c242870.png?x-oss-process=image/resize,w_560)
a) The purpose of the code on line 19, i.e., what does this line of code accomplish?
b) The purpose of the code on lines 21-27 (if statement). Make sure to explain each possibility handled by the if.
Homework Answers
a) The line- pid_t id = fork() creates or forks a child process for the parent process main(). The process id of the child process is returned to the parent. The child process is an exact duplicate of the parent process but operates in a different memory space.
b) the first if condition- if(id == -1) tests for the failure of the creation of the child process, as -1 will be returned to parent if failure occurs.
the second if condition- if(id == 0) checks if the creation of child process was successful as on successful creation, 0 is returned in child process.
and finally, if any other value other than these two is returned then it means that child process is no more running and we are currently in the parent process.
To print the process id's of these processes you can use the getpid() function.
Add Answer to:
a) The purpose of the code on line 19, i.e., what does this line
of code...
(C++/Linux) I am a little confused as to what the first line in the main exactly...
(C++/Linux) I am a little confused as to what the first line in the main exactly does. I am also in need of clarity about all the possibilities in the if statement and what they mean and correspond to (all in the code below). Thank you. #include <iostream> #include <unistd.h> int main() { pid_t id = fork(); if(id == -1) { std::cout << "Error creating process\n"; } else if (id == 0) { std::cout << "I am a child process!\n";...
Source code to modify: #include <stdio.h> #include <unistd.h> #include <sys/types.h> int main() { pid_t pid; /*fork...
Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
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I have the following code....from the previous lab....the above
needs to be added to what is already existing. ALSO MODIFY
SEMAPHORES TO USE pthreads instead of the pipe constructs P() &
V()
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sys/stat.h>
void printStat(char *filename);
//Main
int main(int argc, char *argv[])
{
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pid_t pid;
int j;
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Computer Science Problem C++ cla5a.cpp 1 // cla10a BY student name, CSCI 2170-section 2 //File: cla10a.cpp...
Computer Science Problem C++
cla5a.cpp
1 // cla10a BY student name, CSCI 2170-section
2 //File: cla10a.cpp
3 //Author: Dr. Roland H. Untch
4 //Purpose: This program displays a student's classification
5 // (e.g., "freshman", "sophmore", etc.) based on an
6 // integer classification code that is read in. In
7 // it's current form, this program uses nested IF
8 // statements to encode a "multiway branch" or "case
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Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
1. Write program codes for 3.21 a and...
10. Does the following code compile? Does it run? Is there any problem with the code? If yes, how do you fix it? 1. #include < iostream > 2. using namespace std; 4 class Computer int Id; 7. public: Computer(int id) this -Id- id; ) void process() cout << "Computer::process()"; 9 10. H; 12. class Employee 13. 14. 15. public: 16 Computer* c; Employee )cnew Computer (123); 17.Employee() C 18. 19. 20 21. 22. ^; 23. 24. int main(){ 25....
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I have the following code....from the previous lab....the above
needs to be added to what is already existing. ALSO MODIFY
SEMAPHORES TO USE pthreads instead of the pipe constructs P() &
V()
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sys/stat.h>
void printStat(char *filename);
//Main
int main(int argc, char *argv[])
{
//Process Id (storing)
pid_t pid;
int j;
//printf("Welcome to Project Three\n”);
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Computer Science Problem C++
cla5a.cpp
1 // cla10a BY student name, CSCI 2170-section
2 //File: cla10a.cpp
3 //Author: Dr. Roland H. Untch
4 //Purpose: This program displays a student's classification
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6 // integer classification code that is read in. In
7 // it's current form, this program uses nested IF
8 // statements to encode a "multiway branch" or "case
9 // construct" to determine the student's classification.
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