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Operations on Processes in operating System

Posted on December 5, 2021December 5, 2021 By christo No Comments on Operations on Processes in operating System

The processes in most systems can execute concurrently, and they may be created and deleted dynamically. Thus, these systems must provide a mechanism for process creation and termination

Table of Contents

  • Process Creation
  • Creating a separate process using the UNIX fork() system call
  • Creating a separate process using the Windows API

Process Creation

Most operating systems (including UNIX, Linux, and Windows) identify processes according to a unique process identifier (or pid), which is typically an integer number. The pid provides a unique value for each process in the system, and it can be used as an index to access various attributes of a process within the kernel

Creating a separate process using the UNIX fork() system call

#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
int main()
{
pid t pid;
/* fork a child process */
pid = fork();
if (pid < 0) { /* error occurred */
fprintf(stderr, "Fork Failed");
return 1;
}
else if (pid == 0) { /* child process */
execlp("/bin/ls","ls",NULL);
}
else { /* parent process */
/* parent will wait for the child to complete */
wait(NULL);
printf("Child Complete");
}
return 0;
}

Creating a separate process using the Windows API

#include <stdio.h>
#include <windows.h>
int main(VOID)
{
STARTUPINFO si;
PROCESS INFORMATION pi;
/* allocate memory */
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
/* create child process */
if (!CreateProcess(NULL, /* use command line */
"C:\\WINDOWS\\system32\\mspaint.exe", /* command */
NULL, /* don’t inherit process handle */
NULL, /* don’t inherit thread handle */
FALSE, /* disable handle inheritance */
0, /* no creation flags */
NULL, /* use parent’s environment block */
NULL, /* use parent’s existing directory */
&si,
&pi))
{
fprintf(stderr, "Create Process Failed");
return -1;
}
/* parent will wait for the child to complete */
WaitForSingleObject(pi.hProcess, INFINITE);
printf("Child Complete");
/* close handles */
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
}
operating system Tags:operating system, Operations on Processes in operating System

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