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Commit ddce52c

Browse files
optiklaboptiklab
optiklab
authored and
optiklab
committed
Move common zombie handling function to commons.
1 parent 60b9c13 commit ddce52c

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5 files changed

+26
-44
lines changed

5 files changed

+26
-44
lines changed

‎multithreading/01 - Signals_SIGCHLD.c

Lines changed: 3 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -18,24 +18,15 @@ int main()
1818
printf("Start of process %d\n", main_pid);
1919

2020
// Handle child process killing.
21-
struct sigaction kill_child_signal;
22-
kill_child_signal.sa_handler = kill_child_handler;
23-
sigemptyset(&kill_child_signal.sa_mask);
24-
kill_child_signal.sa_flags = SA_RESTART; // Permanent handler.
25-
26-
if (sigaction(SIGCHLD, &kill_child_signal, 0) == -1)
27-
{
28-
perror("Error of calling sigaction");
29-
exit(EXIT_FAILURE);
30-
}
21+
handle_child_finishing();
3122

3223
// Make child.
3324
pid_t child_pid;
3425
if((child_pid = fork()))
3526
{
36-
printf("Started child process %d.\n", child_pid);
27+
printf("PARENT: Started child process %d.\n", child_pid);
3728

38-
printf("Parent process works 1 second.\n");
29+
printf("PARENT: Parent process works 1 second.\n");
3930

4031
sleep(1);
4132
}

‎multithreading/01 - Signals_SIGINT_SIGTERM_nonkillable_parent.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -73,7 +73,7 @@ int main()
7373
// Make child.
7474
if((child_pid = fork()))
7575
{
76-
printf("Start of child process %d forever. Press Ctrl+C OR write 'kill -9 %d' to terminate child.\n", child_pid, child_pid);
76+
printf("PARENT: Start of child process %d forever. Press Ctrl+C OR write 'kill -9 %d' to terminate child.\n", child_pid, child_pid);
7777
}
7878
else
7979
{

‎multithreading/02 - Flock.c

Lines changed: 4 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -67,16 +67,7 @@ int main()
6767
printf("Start of process %d\n", main_pid);
6868

6969
// Handle child process killing.
70-
struct sigaction kill_child_signal;
71-
kill_child_signal.sa_handler = kill_child_handler;
72-
sigemptyset(&kill_child_signal.sa_mask);
73-
kill_child_signal.sa_flags = SA_RESTART; // Permanent handler.
74-
75-
if (sigaction(SIGCHLD, &kill_child_signal, 0) == -1)
76-
{
77-
perror("Error of calling sigaction");
78-
exit(EXIT_FAILURE);
79-
}
70+
handle_child_finishing();
8071

8172
// Lock file for writing.
8273
if (lock_write())
@@ -93,14 +84,14 @@ int main()
9384
pid_t child_pid;
9485
if ((child_pid = fork()) > 0)
9586
{
96-
printf("Start of child process %d.\n", child_pid);
87+
printf("PARENT: Start of child process %d.\n", child_pid);
9788

9889
// Parent makes child 2.
9990
pid_t next_child_pid;
10091
if ((next_child_pid = fork()) > 0)
10192
{
102-
printf("Start of child process %d.\n", next_child_pid);
103-
printf("Parent process %d sleeps 5 seconds.\n", getpid());
93+
printf("PARENT: Start of child process %d.\n", next_child_pid);
94+
printf("PARENT: Parent process %d sleeps 5 seconds.\n", getpid());
10495
sleep(5);
10596
}
10697
}

‎multithreading/02 - Lock_via_file.c

Lines changed: 3 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -16,21 +16,6 @@
1616
// To access to resource both processes checks existance of a file, which means resource is still locked.
1717
// If file is not exists anymore, then this means resource is free.
1818

19-
void handle_child_finishing()
20-
{
21-
// Handle child process killing.
22-
struct sigaction kill_child_signal;
23-
kill_child_signal.sa_handler = kill_child_handler;
24-
sigemptyset(&kill_child_signal.sa_mask);
25-
kill_child_signal.sa_flags = SA_RESTART; // Permanent handler.
26-
27-
if (sigaction(SIGCHLD, &kill_child_signal, 0) == -1)
28-
{
29-
perror("Error of calling sigaction");
30-
exit(EXIT_FAILURE);
31-
}
32-
}
33-
3419
int unlock()
3520
{
3621
unlink("/tmp/file.txt");
@@ -53,7 +38,7 @@ int lock()
5338
return 1;
5439
}
5540

56-
void main()
41+
int main()
5742
{
5843
pid_t main_pid = getpid();
5944

@@ -64,9 +49,9 @@ void main()
6449

6550
// Make childs.
6651
pid_t child_pid;
67-
if(child_pid = fork())
52+
if((child_pid = fork()))
6853
{
69-
printf("Start of child process %d.\n", child_pid);
54+
printf("PARENT: Started child process %d.\n", child_pid);
7055

7156
sleep(1);
7257
}

‎multithreading/Common.h

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -27,4 +27,19 @@ void kill_child_handler(int sig)
2727
printf("Zombie for PID -- %d successfully removed.\n", done);
2828
}
2929
}
30+
}
31+
32+
void handle_child_finishing()
33+
{
34+
// Handle child process killing.
35+
struct sigaction kill_child_signal;
36+
kill_child_signal.sa_handler = kill_child_handler;
37+
sigemptyset(&kill_child_signal.sa_mask);
38+
kill_child_signal.sa_flags = SA_RESTART; // Permanent handler.
39+
40+
if (sigaction(SIGCHLD, &kill_child_signal, 0) == -1)
41+
{
42+
perror("Error of calling sigaction");
43+
exit(EXIT_FAILURE);
44+
}
3045
}

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