get_proc_info () syscall, CE procinfo command

kernel/proc/proc.c

@@ -6,6 +6,7 @@
 #include <irq/irq.h>
 #include <libk/align.h>
 #include <libk/list.h>
+#include <libk/printf.h>
 #include <libk/rbtree.h>
 #include <libk/std.h>
 #include <libk/string.h>
@@ -16,6 +17,7 @@
 #include <proc/procgroup.h>
 #include <proc/reschedule.h>
 #include <proc/resource.h>
+#include <proc_info.h>
 #include <status.h>
 #include <sync/spin_lock.h>
 #include <sys/debug.h>
@@ -51,6 +53,7 @@ struct proc* kproc_create (void) {
   kproc->flags |= PROC_KPROC;
   kproc->state = PROC_READY;
   kproc->pid = proc_alloc_pid ();
+  snprintf (kproc->name, sizeof (kproc->name), "KPROC CPU %u", thiscpu->id);
 
   kproc->procgroup = procgroup_create ();
   procgroup_attach (kproc->procgroup, kproc);
@@ -64,6 +67,56 @@ struct proc* kproc_create (void) {
   return kproc;
 }
 
+size_t proc_populate_proc_infos (struct proc_info* proc_info, size_t count) {
+  uint64_t fpt, fp, fpg;
+
+  if (count > PIDS_MAX) {
+    count = PIDS_MAX;
+  }
+
+  spin_lock (&proc_tree_lock, &fpt);
+
+  struct rb_node_link* node;
+  rbtree_first (&proc_tree, node);
+
+  size_t i = 0;
+
+  while (node != NULL && i < count) {
+    struct rb_node_link* next;
+    rbtree_next (node, next);
+
+    struct proc* proc = rbtree_entry (node, struct proc, proc_tree_link);
+
+    node = next;
+
+    spin_lock (&proc->lock, &fp);
+    struct procgroup* procgroup = proc->procgroup;
+    spin_unlock (&proc->lock, fp);
+
+    spin_lock (&procgroup->lock, &fpg);
+    spin_lock (&proc->lock, &fp);
+
+    struct cpu* cpu = proc->cpu;
+
+    proc_info[i].cpu = cpu->id;
+    proc_info[i].exec_pid = proc->exec_pid;
+    proc_info[i].flags = proc->flags;
+    proc_info[i].pid = proc->pid;
+    proc_info[i].state = proc->state;
+    proc_info[i].pgid = proc->procgroup->pgid;
+    memcpy (proc_info[i].name, proc->name, sizeof (proc->name));
+
+    spin_unlock (&proc->lock, fp);
+    spin_unlock (&procgroup->lock, fpg);
+
+    i++;
+  }
+
+  spin_unlock (&proc_tree_lock, fpt);
+
+  return i;
+}
+
 static bool proc_check_elf (uint8_t* elf) {
   if (!((elf[0] == 0x7F) && (elf[1] == 'E') && (elf[2] == 'L') && (elf[3] == 'F')))
     return false;
@@ -173,6 +226,9 @@ struct proc* proc_from_file (struct proc* proc1, const char* volume, const char*
   struct proc* proc = proc_from_elf (temp_buffer);
 
   free (temp_buffer);
+
+  snprintf (proc->name, sizeof (proc->name), "%s:%s", volume, path);
+
   return proc;
 }