aboutsummaryrefslogtreecommitdiffstats
path: root/lib/utils.c
blob: 7c683d13a97ba1be39175cf923cc2c9dbd33f34f (plain)
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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/* PipeWire AGL Cluster IPC
 *
 * Copyright © 2021 Collabora Ltd.
 *    @author Julian Bouzas <julian.bouzas@collabora.com>
 *
 * SPDX-License-Identifier: MIT
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
#include <errno.h>
#include <assert.h>

#include "private.h"

#define MAX_POLL_EVENTS 128
#define MAX_LOG_MESSAGE 1024

/* log */

const char *icipc_logger_level_text[] = {
  [ICIPC_LOG_LEVEL_ERROR] = "E",
  [ICIPC_LOG_LEVEL_WARN] = "W",
  [ICIPC_LOG_LEVEL_INFO] = "I",
};

struct icipc_logger {
  enum icipc_log_level level;
};

static const struct icipc_logger *
icipc_log_get_instance (void)
{
  static struct icipc_logger logger_ = { 0, };
  static struct icipc_logger* instance_ = NULL;

  if (instance_ == NULL) {
    char * val_str = NULL;
    enum icipc_log_level val = 0;

    /* default to error */
    logger_.level = ICIPC_LOG_LEVEL_WARN;

    /* get level from env */
    val_str = getenv ("ICIPC_DEBUG");
    if (val_str && sscanf (val_str, "%u", &val) == 1 &&
        val >= ICIPC_LOG_LEVEL_NONE)
      logger_.level = val;

    instance_ = &logger_;
  }

  return instance_;
}

void
icipc_logv (enum icipc_log_level level, const char *fmt, va_list args)
{
  const struct icipc_logger *logger = NULL;

  logger = icipc_log_get_instance ();
  assert (logger);

  if (logger->level >= level) {
    assert (level > 0);
    char msg[MAX_LOG_MESSAGE];
    struct timespec time;
    clock_gettime (CLOCK_REALTIME, &time);
    vsnprintf (msg, MAX_LOG_MESSAGE, fmt, args);
    fprintf (stderr, "[%s][%lu.%lu] %s\n", icipc_logger_level_text[level],
        time.tv_sec, time.tv_sec, msg);
  }
}

void
icipc_log (enum icipc_log_level level, const char *fmt, ...)
{
  va_list args;
  va_start (args, fmt);
  icipc_logv (level, fmt, args);
  va_end (args);
}

/* socket */

ssize_t
icipc_socket_write (int fd, const uint8_t *buffer, size_t size)
{
  size_t total_written = 0;
  size_t n;

  assert (fd >= 0);
  assert (buffer != NULL);
  assert (size > 0);

  do {
    n = write(fd, buffer, size);
    if (n < size) {
      if (errno == EINTR)
        continue;
      if (errno == EAGAIN || errno == EWOULDBLOCK)
        return total_written;
      return -1;
    }
    total_written += n;
  } while (total_written < size);

  return total_written;
}

ssize_t
icipc_socket_read (int fd, uint8_t **buffer, size_t *max_size)
{
  ssize_t n;
  ssize_t size;
  size_t offset = 0;

  assert (buffer);
  assert (*buffer);
  assert (max_size);
  assert (*max_size > 0);

again:
  size = *max_size - offset;
  n = read (fd, *buffer + offset, size);
  if (n == 0)
    return 0;

  /* check for errors */
  if (n < 0) {
    if (errno == EINTR)
      goto again;
    if (errno == EAGAIN || errno == EWOULDBLOCK)
      return offset;
    return -1;
  }

  /* realloc if we need more space, and read again */
  if (n >= size) {
    *max_size += *max_size;
    *buffer = reallocarray (*buffer, *max_size, sizeof (uint8_t));
    offset += n;
    goto again;
  }

  return offset + n;
}

/* epoll thread */

bool
icipc_epoll_thread_init (struct epoll_thread *self,
                         int socket_fd,
                         icipc_epoll_thread_event_funct_t sock_func,
                         icipc_epoll_thread_event_funct_t other_func,
                         void *data)
{
  struct epoll_event event;

  self->socket_fd = socket_fd;
  self->event_fd = -1;
  self->epoll_fd = -1;

  /* create event fd */
  self->event_fd = eventfd (0, EFD_CLOEXEC | EFD_NONBLOCK);
  if (self->event_fd == -1)
    goto error;

  /* create epoll fd */
  self->epoll_fd = epoll_create1 (EPOLL_CLOEXEC);
  if (self->epoll_fd == -1)
    goto error;

  /* poll socket fd */
  event.events = EPOLLIN;
  event.data.fd = self->socket_fd;
  if (epoll_ctl (self->epoll_fd, EPOLL_CTL_ADD, self->socket_fd, &event) != 0)
    goto error;

  /* poll event fd */
  event.events = EPOLLIN;
  event.data.fd = self->event_fd;
  if (epoll_ctl (self->epoll_fd, EPOLL_CTL_ADD, self->event_fd, &event) != 0)
    goto error;

  self->socket_event_func = sock_func;
  self->other_event_func = other_func;
  self->event_data = data;
  return true;

error:
  if (self->epoll_fd != -1)
    close (self->epoll_fd);
  if (self->event_fd != -1)
    close (self->event_fd);
  return false;
}

static void *
epoll_thread_run (void *data)
{
  struct epoll_thread *self = data;
  bool exit = false;

  while (!exit) {
    /* wait for events */
    struct epoll_event ep[MAX_POLL_EVENTS];
    int n = epoll_wait (self->epoll_fd, ep, MAX_POLL_EVENTS, -1);
    if (n < 0) {
      icipc_log_error ("epoll_thread: failed to wait for event: %s",
          strerror(errno));
      continue;
    }

    for (int i = 0; i < n; i++) {
      /* socket fd */
      if (ep[i].data.fd == self->socket_fd) {
        if (self->socket_event_func)
          self->socket_event_func (self, ep[i].data.fd, self->event_data);
      }

      /* event fd */
      else if (ep[i].data.fd == self->event_fd) {
        uint64_t stop = 0;
        ssize_t res = read (ep[i].data.fd, &stop, sizeof(uint64_t));
        if (res == sizeof(uint64_t) && stop == 1)
          exit = true;
      }

      /* other */
      else {
        if (self->other_event_func)
          self->other_event_func (self, ep[i].data.fd, self->event_data);
      }
    }
  }

  return NULL;
}

bool
icipc_epoll_thread_start (struct epoll_thread *self)
{
  return pthread_create (&self->thread, NULL, epoll_thread_run, self) == 0;
}

void
icipc_epoll_thread_stop (struct epoll_thread *self)
{
  uint64_t value = 1;
  ssize_t res = write (self->event_fd, &value, sizeof(uint64_t));
  if (res == sizeof(uint64_t))
    pthread_join (self->thread, NULL);
}

void
icipc_epoll_thread_destroy (struct epoll_thread *self)
{
  close (self->epoll_fd);
  close (self->event_fd);
}