projects/linux·blob 4563243e · refs

149 lines · 3.0 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014, Red Hat Inc, Arnaldo Carvalho de Melo <[email protected]>
4 */
5#include "array.h"
6#include <errno.h>
7#include <fcntl.h>
8#include <poll.h>
9#include <stdlib.h>
10#include <unistd.h>
11#include <string.h>
12
13void fdarray__init(struct fdarray *fda, int nr_autogrow)
14{
15 fda->entries = NULL;
16 fda->priv = NULL;
17 fda->nr = fda->nr_alloc = 0;
18 fda->nr_autogrow = nr_autogrow;
19}
20
21int fdarray__grow(struct fdarray *fda, int nr)
22{
23 struct priv *priv;
24 int nr_alloc = fda->nr_alloc + nr;
25 size_t psize = sizeof(fda->priv[0]) * nr_alloc;
26 size_t size = sizeof(struct pollfd) * nr_alloc;
27 struct pollfd *entries = realloc(fda->entries, size);
28
29 if (entries == NULL)
30 return -ENOMEM;
31
32 priv = realloc(fda->priv, psize);
33 if (priv == NULL) {
34 free(entries);
35 return -ENOMEM;
36 }
37
38 memset(&entries[fda->nr_alloc], 0, sizeof(struct pollfd) * nr);
39 memset(&priv[fda->nr_alloc], 0, sizeof(fda->priv[0]) * nr);
40
41 fda->nr_alloc = nr_alloc;
42 fda->entries = entries;
43 fda->priv = priv;
44 return 0;
45}
46
47struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow)
48{
49 struct fdarray *fda = calloc(1, sizeof(*fda));
50
51 if (fda != NULL) {
52 if (fdarray__grow(fda, nr_alloc)) {
53 free(fda);
54 fda = NULL;
55 } else {
56 fda->nr_autogrow = nr_autogrow;
57 }
58 }
59
60 return fda;
61}
62
63void fdarray__exit(struct fdarray *fda)
64{
65 free(fda->entries);
66 free(fda->priv);
67 fdarray__init(fda, 0);
68}
69
70void fdarray__delete(struct fdarray *fda)
71{
72 fdarray__exit(fda);
73 free(fda);
74}
75
76int fdarray__add(struct fdarray *fda, int fd, short revents, enum fdarray_flags flags)
77{
78 int pos = fda->nr;
79
80 if (fda->nr == fda->nr_alloc &&
81 fdarray__grow(fda, fda->nr_autogrow) < 0)
82 return -ENOMEM;
83
84 fda->entries[fda->nr].fd = fd;
85 fda->entries[fda->nr].events = revents;
86 fda->priv[fda->nr].flags = flags;
87 fda->nr++;
88 return pos;
89}
90
91int fdarray__dup_entry_from(struct fdarray *fda, int pos, struct fdarray *from)
92{
93 struct pollfd *entry;
94 int npos;
95
96 if (pos >= from->nr)
97 return -EINVAL;
98
99 entry = &from->entries[pos];
100
101 npos = fdarray__add(fda, entry->fd, entry->events, from->priv[pos].flags);
102 if (npos >= 0)
103 fda->priv[npos] = from->priv[pos];
104
105 return npos;
106}
107
108int fdarray__filter(struct fdarray *fda, short revents,
109 void (*entry_destructor)(struct fdarray *fda, int fd, void *arg),
110 void *arg)
111{
112 int fd, nr = 0;
113
114 if (fda->nr == 0)
115 return 0;
116
117 for (fd = 0; fd < fda->nr; ++fd) {
118 if (!fda->entries[fd].events)
119 continue;
120
121 if (fda->entries[fd].revents & revents) {
122 if (entry_destructor)
123 entry_destructor(fda, fd, arg);
124
125 fda->entries[fd].revents = fda->entries[fd].events = 0;
126 continue;
127 }
128
129 if (!(fda->priv[fd].flags & fdarray_flag__nonfilterable))
130 ++nr;
131 }
132
133 return nr;
134}
135
136int fdarray__poll(struct fdarray *fda, int timeout)
137{
138 return poll(fda->entries, fda->nr, timeout);
139}
140
141int fdarray__fprintf(struct fdarray *fda, FILE *fp)
142{
143 int fd, printed = fprintf(fp, "%d [ ", fda->nr);
144
145 for (fd = 0; fd < fda->nr; ++fd)
146 printed += fprintf(fp, "%s%d", fd ? ", " : "", fda->entries[fd].fd);
147
148 return printed + fprintf(fp, " ]");
149}