1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include "macro.h"
/* An embeddable structure carrying a reference to a process. Supposed to be used when tracking processes continuously. */
typedef struct PidRef {
pid_t pid; /* always valid */
int fd; /* only valid if pidfd are available in the kernel, and we manage to get an fd */
} PidRef;
#define PIDREF_NULL (const PidRef) { .fd = -EBADF }
/* Turns a pid_t into a PidRef structure on-the-fly *without* acquiring a pidfd for it. (As opposed to
* pidref_set_pid() which does so *with* acquiring one, see below) */
#define PIDREF_MAKE_FROM_PID(x) (PidRef) { .pid = (x), .fd = -EBADF }
static inline bool pidref_is_set(const PidRef *pidref) {
return pidref && pidref->pid > 0;
}
static inline bool pidref_equal(const PidRef *a, const PidRef *b) {
if (pidref_is_set(a)) {
if (!pidref_is_set(b))
return false;
return a->pid == b->pid;
}
return !pidref_is_set(b);
}
/* This turns a pid_t into a PidRef structure, and acquires a pidfd for it, if possible. (As opposed to
* PIDREF_MAKE_FROM_PID() above, which does not acquire a pidfd.) */
int pidref_set_pid(PidRef *pidref, pid_t pid);
int pidref_set_pidstr(PidRef *pidref, const char *pid);
int pidref_set_pidfd(PidRef *pidref, int fd);
int pidref_set_pidfd_take(PidRef *pidref, int fd); /* takes ownership of the passed pidfd on success*/
int pidref_set_pidfd_consume(PidRef *pidref, int fd); /* takes ownership of the passed pidfd in both success and failure */
static inline int pidref_set_self(PidRef *pidref) {
return pidref_set_pid(pidref, 0);
}
bool pidref_is_self(const PidRef *pidref);
void pidref_done(PidRef *pidref);
PidRef *pidref_free(PidRef *pidref);
DEFINE_TRIVIAL_CLEANUP_FUNC(PidRef*, pidref_free);
int pidref_dup(const PidRef *pidref, PidRef **ret);
int pidref_new_from_pid(pid_t pid, PidRef **ret);
int pidref_kill(const PidRef *pidref, int sig);
int pidref_kill_and_sigcont(const PidRef *pidref, int sig);
int pidref_sigqueue(const PidRef *pidfref, int sig, int value);
int pidref_verify(const PidRef *pidref);
#define TAKE_PIDREF(p) TAKE_GENERIC((p), PidRef, PIDREF_NULL)
extern const struct hash_ops pidref_hash_ops;
extern const struct hash_ops pidref_hash_ops_free; /* Has destructor call for pidref_free(), i.e. expects heap allocated PidRef as keys */
|
