99#define EXIT_FAILURE 1
1010
1111// Compilation:
12- // gcc -std=gnu99 "00 - Processes.c" -o processes
12+ // gcc -std=gnu99 "00 - Fork Processes.c" -o forkProcesses
1313
1414// Task:
1515// Use fork to create a child process.
1616
17- void main (int argc , char * argv [])
17+ int main (int argc , char * argv [])
1818{
19- printf ("0 Enter to main!\n" );
19+ printf ("Enter to main!\n" );
2020 for (int i = 0 ; i < NUMBER_OF_PROCESSES ; i ++ )
2121 {
2222 pid_t pid ;
2323 int status ;
2424 switch (pid = fork ())
2525 {
2626 case -1 :
27- perror ("1 Error of calling fork" );
27+ printf ("PROC %d:" , i );
28+ perror ("1 Error of calling fork" );
2829 exit (EXIT_FAILURE );
2930 case 0 :
30- printf ("1 CHILD: Child process %d!\n" , getpid ());
31- printf ("2 CHILD: Parent PID %d!\n" , getppid ());
32- printf ("3 CHILD: Wait 10 seconds...\n" );
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 );
3334 sleep (10 );
34- printf ("4 CHILD: Exit!\n" );
35+ printf ("PROC %d: 4 CHILD: Exit!\n" , i );
3536 exit (EXIT_FAILURE );
3637 default :
37- printf ("1 PARENT: Parent process %d!\n" , getpid ());
38- printf ("2 PARENT: Child PID %d\n" , pid );
39- printf ("3 PARENT: Wait until child calls exit()...\n" );
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 );
4041 waitpid (pid , & status , 0 );
41- printf ("4 PARENT: Child exit code: %d\n" , WEXITSTATUS (status ));
42- printf ("5 PARENT: Exit!\n" );
42+ printf ("PROC %d: 4 PARENT: Child exit code: %d\n" , i , WEXITSTATUS (status ));
43+ printf ("PROC %d: 5 PARENT: Exit!\n" , i );
4344 }
4445 }
4546
46- printf ("1 Exit main!\n" );
47+ printf ("Exit main!\n" );
4748 exit (0 );
4849}
0 commit comments