44#include <unistd.h>
55#include <sys/wait.h> // For wait, waitpid
66
7+ #include "Common.h"
8+ 79#define PORTNUM 1500 // Port > 1024 because program will not work not as root.
810#define NUMBER_OF_PROCESSES 2
9- #define EXIT_FAILURE 1
1011
1112// Compilation:
1213// gcc -std=gnu99 "00 - Fork Processes.c" -o forkProcesses
1718int main (int argc , char * argv [])
1819{
1920 printf ("Enter to main!\n" );
21+ printf ("Creating %d of child processes...\n" , NUMBER_OF_PROCESSES );
2022 for (int i = 0 ; i < NUMBER_OF_PROCESSES ; i ++ )
2123 {
2224 pid_t pid ;
2325 int status ;
2426 switch (pid = fork ())
2527 {
2628 case -1 :
27- printf ("PROC %d:" , i );
28- perror ("1 Error of calling fork" );
29- exit (EXIT_FAILURE );
29+ printf ("PROC %d:" , i );
30+ perror ("1 Error of calling fork" );
31+ exit (EXIT_FAILURE );
3032 case 0 :
31- printf ("PROC %d: 1 CHILD: Child process %d!\n" , i , getpid ());
32- printf ("PROC %d: 2 CHILD: Parent PID %d!\n" , i , getppid ());
33- printf ("PROC %d: 3 CHILD: Wait 10 seconds...\n" , i );
34- sleep (10 );
35- printf ("PROC %d: 4 CHILD: Exit!\n" , i );
36- exit (EXIT_FAILURE );
33+ printf ("PROC %d: 1 CHILD: Child process %d!\n" , i , getpid ());
34+ printf ("PROC %d: 2 CHILD: Parent PID %d!\n" , i , getppid ());
35+ printf ("PROC %d: 3 CHILD: Wait 4 seconds...\n" , i );
36+ sleep (4 );
37+ printf ("PROC %d: 4 CHILD: Exit!\n" , i );
38+ exit (EXIT_SUCCESS );
3739 default :
38- printf ("PROC %d: 1 PARENT: Parent process %d!\n" , i , getpid ());
39- printf ("PROC %d: 2 PARENT: Child PID %d\n" , i , pid );
40- printf ("PROC %d: 3 PARENT: Wait until child calls exit()...\n" , i );
41- waitpid (pid , & status , 0 );
42- printf ("PROC %d: 4 PARENT: Child exit code: %d\n" , i , WEXITSTATUS (status ));
43- printf ("PROC %d: 5 PARENT: Exit!\n" , i );
40+ printf ("PROC %d: 1 PARENT: Parent process %d!\n" , i , getpid ());
41+ printf ("PROC %d: 2 PARENT: My child PID %d\n" , i , pid );
42+ printf ("PROC %d: 3 PARENT: Wait until child calls exit()...\n" , i );
43+ waitpid (pid , & status , 0 );
44+ printf ("PROC %d: 4 PARENT: Child exit code: %d\n" , i , WEXITSTATUS (status ));
45+ printf ("PROC %d: 5 PARENT: Exit!\n" , i );
4446 }
4547 }
4648
4749 printf ("Exit main!\n" );
48- exit (0 );
50+ exit (EXIT_SUCCESS );
4951}
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