[c] Differences between fork and exec

Fork creates a copy of a calling process. generally follows the structure enter image description here

int cpid = fork( );

if (cpid = = 0) 
{

  //child code

  exit(0);

}

//parent code

wait(cpid);

// end

(for child process text(code),data,stack is same as calling process) child process executes code in if block.

EXEC replaces the current process with new process's code,data,stack. generally follows the structure enter image description here

int cpid = fork( );

if (cpid = = 0) 
{   
  //child code

  exec(foo);

  exit(0);    
}

//parent code

wait(cpid);

// end

(after exec call unix kernel clears the child process text,data,stack and fills with foo process related text/data) thus child process is with different code (foo's code {not same as parent})

Examples related to c

conflicting types for 'outchar' Can't compile C program on a Mac after upgrade to Mojave Program to find largest and second largest number in array Prime numbers between 1 to 100 in C Programming Language In c, in bool, true == 1 and false == 0? How I can print to stderr in C? Visual Studio Code includePath "error: assignment to expression with array type error" when I assign a struct field (C) Compiling an application for use in highly radioactive environments How can you print multiple variables inside a string using printf?

Examples related to unix

Docker CE on RHEL - Requires: container-selinux >= 2.9 What does `set -x` do? How to find files modified in last x minutes (find -mmin does not work as expected) sudo: npm: command not found How to sort a file in-place How to read a .properties file which contains keys that have a period character using Shell script gpg decryption fails with no secret key error Loop through a comma-separated shell variable Best way to find os name and version in Unix/Linux platform Resource u'tokenizers/punkt/english.pickle' not found

Examples related to fork

How to use execvp() Example of waitpid() in use? How to make parent wait for all child processes to finish? fork: retry: Resource temporarily unavailable fork() child and parent processes How to kill a child process by the parent process? How to use shared memory with Linux in C The difference between fork(), vfork(), exec() and clone() fork() and wait() with two child processes Redirecting exec output to a buffer or file

Examples related to exec

I do not understand how execlp() works in Linux Running a Python script from PHP How do I execute a Shell built-in command with a C function? What are the uses of the exec command in shell scripts? php exec() is not executing the command How to call execl() in C with the proper arguments? Run Bash Command from PHP PHP shell_exec() vs exec() Ruby, Difference between exec, system and %x() or Backticks How to execute an external program from within Node.js?