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pstree: more pstree-related helpers

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This patch introduces three helpers:
1) pstree_item_by_real() - search for pstree item by real pid.
2) pstree_item_by_virt() - search for pstree item by virtual pid.
3) pid_to_virt() - return virtual pis by real one.

Note: pstree_item_by_virt() and pid_to_virt() will be used to migrate AutoFS.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Stanislav Kinsburskiy 2015-12-10 18:16:12 +03:00 • committed by Pavel Emelyanov
parent bde6d0dbf9
commit 1617579a27
2 changed files with 35 additions and 5 deletions
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5
include/pstree.h
View file

@ -78,6 +78,11 @@ extern bool restore_before_setsid(struct pstree_item *child);
extern int prepare_pstree(void);
extern int dump_pstree(struct pstree_item *root_item);
struct pstree_item *pstree_item_by_real(pid_t virt);
struct pstree_item *pstree_item_by_virt(pid_t virt);
extern int pid_to_virt(pid_t pid);
extern bool pid_in_pstree(pid_t pid);
struct task_entries;

35
pstree.c
View file

@ -778,14 +778,39 @@ bool restore_before_setsid(struct pstree_item *child)
return false;
}
bool pid_in_pstree(pid_t pid)
struct pstree_item *pstree_item_by_virt(pid_t virt)
{
struct pstree_item *item;
for_each_pstree_item(item) {
if (item->pid.real == pid)
return true;
if (item->pid.virt == virt)
return item;
}
return false;
return NULL;
}
struct pstree_item *pstree_item_by_real(pid_t real)
{
struct pstree_item *item;
for_each_pstree_item(item) {
if (item->pid.real == real)
return item;
}
return NULL;
}
int pid_to_virt(pid_t real)
{
struct pstree_item *item;
item = pstree_item_by_real(real);
if (item)
return item->pid.virt;
return 0;
}
bool pid_in_pstree(pid_t pid)
{
return pstree_item_by_real(pid) != NULL;
}