Cleanup: simplify 'poll' wrapper build
[lttng-tools.git] / src / common / fd-tracker / utils-poll.c
1 /*
2 * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include <common/compat/poll.h>
9
10 #include "utils.h"
11
12 #if HAVE_EPOLL
13
14 struct create_args {
15 struct lttng_poll_event *events;
16 int size;
17 int flags;
18 };
19
20 static int open_epoll(void *data, int *out_fd)
21 {
22 int ret;
23 struct create_args *args = data;
24
25 ret = lttng_poll_create(args->events, args->size, args->flags);
26 if (ret < 0) {
27 goto end;
28 }
29
30 *out_fd = args->events->epfd;
31 end:
32 return ret;
33 }
34
35 static int close_epoll(void *data, int *in_fd)
36 {
37 /* Will close the epfd. */
38 lttng_poll_clean((struct lttng_poll_event *) data);
39 return 0;
40 }
41
42 /*
43 * The epoll variant of the poll compat layer creates an unsuspendable fd which
44 * must be tracked.
45 */
46 int fd_tracker_util_poll_create(struct fd_tracker *tracker,
47 const char *name,
48 struct lttng_poll_event *events,
49 int size,
50 int flags)
51 {
52 int out_fd;
53 struct create_args create_args = {
54 .events = events,
55 .size = size,
56 .flags = flags,
57 };
58
59 return fd_tracker_open_unsuspendable_fd(
60 tracker, &out_fd, &name, 1, open_epoll, &create_args);
61 }
62
63 int fd_tracker_util_poll_clean(
64 struct fd_tracker *tracker, struct lttng_poll_event *events)
65 {
66 return fd_tracker_close_unsuspendable_fd(
67 tracker, &events->epfd, 1, close_epoll, events);
68 }
69
70 #else /* HAVE_EPOLL */
71
72 /*
73 * The epoll variant of the poll compat layer creates an unsuspendable fd which
74 * must be tracked.
75 */
76 int fd_tracker_util_poll_create(struct fd_tracker *tracker,
77 const char *name,
78 struct lttng_poll_event *events,
79 int size,
80 int flags)
81 {
82 return lttng_poll_create(events, size, flags);
83 }
84
85 int fd_tracker_util_poll_clean(
86 struct fd_tracker *tracker, struct lttng_poll_event *events)
87 {
88 lttng_poll_clean(events);
89 return 0;
90 }
91
92 #endif /* !HAVE_EPOLL */
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