user@system - Terminal
// kernel.c
#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
int main() {
pid_t pid = fork();
if (pid == 0) {
execve("/bin/ls", NULL, NULL);
} else {
wait(&status);
}
}
user@system:~$ gcc -o kernel kernel.c -lpthread
Compilation successful.
user@system:~$ ./kernel
Process 1234 created
Fork successful: PID 1235
Child process executing /bin/ls...
Desktop Documents Downloads kernel kernel.c
Parent process waiting...
Child process exited with status 0
user@system:~$ ps aux | grep kernel
root 1234 0.1 0.2 4512 2048 ? S 12:34 0:01 ./kernel
user 1235 0.0 0.1 2048 1024 ? Z 12:34 0:00 [kernel] <defunct>
user@system:~$ strace -p 1234
read(3, "Hello World\\n", 12) = 12
write(1, "Hello World\\n", 12) = 12
fork() = 1235
execve("/bin/ls", ["/bin/ls"], envp) = 0
wait4(1235, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 1235
exit_group(0) = ?
+++ exited with 0 +++
user@system:~$ cat /proc/1234/maps
08048000-08049000 r-xp 00000000 08:01 12345 /home/user/kernel
08049000-0804a000 rw-p 00001000 08:01 12345 /home/user/kernel
bfffe000-c0000000 rw-p 00000000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
user@system:~$ █
← Back to Blog

Operating Systems

Distributed Computing

Operating systems, distributed computing, and system architecture

System Architecture

Distributed Consensus Algorithms

20 min read

Raft, PBFT, and other consensus mechanisms in distributed systems.

2024-01-07

Memory Management Strategies

14 min read

Advanced memory management techniques in modern operating systems.

2024-01-02