tests/test-poll.c

   1 /* Test of poll() function.
   2    Copyright (C) 2008-2018 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Paolo Bonzini.  */
  18
  19 #include <config.h>
  20
  21 /* Specification.  */
  22 #include <poll.h>
  23
  24 #include "signature.h"
  25 SIGNATURE_CHECK (poll, int, (struct pollfd[], nfds_t, int));
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <sys/socket.h>
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #include <fcntl.h>
  33 #include <stdlib.h>
  34 #include <stdbool.h>
  35 #include <sys/ioctl.h>
  36 #include <errno.h>
  37
  38 #include "macros.h"
  39
  40 #if defined _WIN32 && ! defined __CYGWIN__
  41 # define WINDOWS_NATIVE
  42 #endif
  43
  44 #ifdef WINDOWS_NATIVE
  45 #include <io.h>
  46 #define pipe(x) _pipe(x, 256, O_BINARY)
  47 #endif
  48 #ifdef HAVE_UNISTD_H
  49 #include <unistd.h>
  50 #endif
  51 #ifdef HAVE_SYS_WAIT_H
  52 #include <sys/wait.h>
  53 #endif
  54
  55 #define TEST_PORT       12345
  56
  57
  58 /* Minimal testing infrastructure.  */
  59
  60 static int failures;
  61
  62 static void
  63 failed (const char *reason)
  64 {
  65   if (++failures > 1)
  66     printf ("  ");
  67   printf ("failed (%s)\n", reason);
  68 }
  69
  70 static int
  71 test (void (*fn) (void), const char *msg)
  72 {
  73   failures = 0;
  74   printf ("%s... ", msg);
  75   fflush (stdout);
  76   fn ();
  77
  78   if (!failures)
  79     printf ("passed\n");
  80
  81   return failures;
  82 }
  83
  84
  85 /* Funny socket code.  */
  86
  87 static int
  88 open_server_socket ()
  89 {
  90   int s, x;
  91   struct sockaddr_in ia;
  92
  93   s = socket (AF_INET, SOCK_STREAM, 0);
  94
  95   x = 1;
  96   setsockopt (s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof (x));
  97
  98   memset (&ia, 0, sizeof (ia));
  99   ia.sin_family = AF_INET;
 100   inet_pton (AF_INET, "127.0.0.1", &ia.sin_addr);
 101   ia.sin_port = htons (TEST_PORT);
 102   if (bind (s, (struct sockaddr *) &ia, sizeof (ia)) < 0)
 103     {
 104       perror ("bind");
 105       exit (77);
 106     }
 107
 108   if (listen (s, 1) < 0)
 109     {
 110       perror ("listen");
 111       exit (77);
 112     }
 113
 114   return s;
 115 }
 116
 117 static int
 118 connect_to_socket (int blocking)
 119 {
 120   int s;
 121   struct sockaddr_in ia;
 122
 123   s = socket (AF_INET, SOCK_STREAM, 0);
 124
 125   memset (&ia, 0, sizeof (ia));
 126   ia.sin_family = AF_INET;
 127   inet_pton (AF_INET, "127.0.0.1", &ia.sin_addr);
 128   ia.sin_port = htons (TEST_PORT);
 129
 130   if (!blocking)
 131     {
 132 #ifdef WINDOWS_NATIVE
 133       unsigned long iMode = 1;
 134       ioctl (s, FIONBIO, (char *) &iMode);
 135
 136 #elif defined F_GETFL
 137       int oldflags = fcntl (s, F_GETFL, NULL);
 138
 139       if (!(oldflags & O_NONBLOCK))
 140         fcntl (s, F_SETFL, oldflags | O_NONBLOCK);
 141 #endif
 142     }
 143
 144   if (connect (s, (struct sockaddr *) &ia, sizeof (ia)) < 0
 145       && (blocking || errno != EINPROGRESS))
 146     {
 147       perror ("connect");
 148       exit (77);
 149     }
 150
 151   return s;
 152 }
 153
 154
 155 /* A slightly more convenient interface to poll(2).  */
 156
 157 static int
 158 poll1 (int fd, int ev, int time)
 159 {
 160   struct pollfd pfd;
 161   int r;
 162
 163   pfd.fd = fd;
 164   pfd.events = ev;
 165   pfd.revents = -1;
 166   r = poll (&pfd, 1, time);
 167   if (r < 0)
 168     return r;
 169
 170   if (pfd.revents & ~(POLLHUP | POLLERR | POLLNVAL | ev))
 171     failed ("invalid flag combination (unrequested events)");
 172
 173   return pfd.revents;
 174 }
 175
 176 static int
 177 poll1_nowait (int fd, int ev)
 178 {
 179   return poll1 (fd, ev, 0);
 180 }
 181
 182 static int
 183 poll1_wait (int fd, int ev)
 184 {
 185   return poll1 (fd, ev, -1);
 186 }
 187
 188
 189 /* Test poll(2) for TTYs.  */
 190
 191 #ifdef INTERACTIVE
 192 static void
 193 test_tty (void)
 194 {
 195   if (poll1_nowait (0, POLLIN | POLLRDNORM) != 0)
 196     failed ("can read");
 197   if (poll1_nowait (0, POLLOUT) == 0)
 198     failed ("cannot write");
 199
 200   if (poll1_wait (0, POLLIN | POLLRDNORM) == 0)
 201     failed ("return with infinite timeout");
 202
 203   getchar ();
 204   if (poll1_nowait (0, POLLIN | POLLRDNORM) != 0)
 205     failed ("can read after getc");
 206 }
 207 #endif
 208
 209
 210 /* Test poll(2) for unconnected nonblocking sockets.  */
 211
 212 static void
 213 test_connect_first (void)
 214 {
 215   int s = open_server_socket ();
 216   struct sockaddr_in ia;
 217   socklen_t addrlen;
 218
 219   int c1, c2;
 220
 221   if (poll1_nowait (s, POLLIN | POLLRDNORM | POLLRDBAND) != 0)
 222     failed ("can read, socket not connected");
 223
 224   c1 = connect_to_socket (false);
 225
 226   if (poll1_wait (s, POLLIN | POLLRDNORM | POLLRDBAND) != (POLLIN | POLLRDNORM))
 227     failed ("expecting POLLIN | POLLRDNORM on passive socket");
 228   if (poll1_nowait (s, POLLIN | POLLRDBAND) != POLLIN)
 229     failed ("expecting POLLIN on passive socket");
 230   if (poll1_nowait (s, POLLRDNORM | POLLRDBAND) != POLLRDNORM)
 231     failed ("expecting POLLRDNORM on passive socket");
 232
 233   addrlen = sizeof (ia);
 234   c2 = accept (s, (struct sockaddr *) &ia, &addrlen);
 235   close (s);
 236   close (c1);
 237   close (c2);
 238 }
 239
 240
 241 /* Test poll(2) for unconnected blocking sockets.  */
 242
 243 static void
 244 test_accept_first (void)
 245 {
 246 #ifndef WINDOWS_NATIVE
 247   int s = open_server_socket ();
 248   struct sockaddr_in ia;
 249   socklen_t addrlen;
 250   char buf[3];
 251   int c, pid;
 252
 253   pid = fork ();
 254   if (pid < 0)
 255     return;
 256
 257   if (pid == 0)
 258     {
 259       addrlen = sizeof (ia);
 260       c = accept (s, (struct sockaddr *) &ia, &addrlen);
 261       ASSERT (c >= 0);
 262       close (s);
 263       ASSERT (write (c, "foo", 3) == 3);
 264       ASSERT (read (c, buf, 3) == 3);
 265       shutdown (c, SHUT_RD);
 266       close (c);
 267       exit (0);
 268     }
 269   else
 270     {
 271       close (s);
 272       c = connect_to_socket (true);
 273       ASSERT (c >= 0);
 274       if (poll1_nowait (c, POLLOUT | POLLWRNORM | POLLRDBAND)
 275           != (POLLOUT | POLLWRNORM))
 276         failed ("cannot write after blocking connect");
 277       ASSERT (write (c, "foo", 3) == 3);
 278       wait (&pid);
 279       if (poll1_wait (c, POLLIN) != POLLIN)
 280         failed ("cannot read data left in the socket by closed process");
 281       ASSERT (read (c, buf, 3) == 3);
 282       ASSERT (write (c, "foo", 3) == 3);
 283       if ((poll1_wait (c, POLLIN | POLLOUT) & (POLLHUP | POLLERR)) == 0)
 284         failed ("expecting POLLHUP after shutdown");
 285       close (c);
 286     }
 287 #endif
 288 }
 289
 290
 291 /* Common code for pipes and connected sockets.  */
 292
 293 static void
 294 test_pair (int rd, int wd)
 295 {
 296   char buf[3];
 297   if (poll1_wait (wd, POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM | POLLRDBAND)
 298       != (POLLOUT | POLLWRNORM))
 299     failed ("expecting POLLOUT | POLLWRNORM before writing");
 300   if (poll1_nowait (wd, POLLIN | POLLRDNORM | POLLOUT | POLLRDBAND) != POLLOUT)
 301     failed ("expecting POLLOUT before writing");
 302   if (poll1_nowait (wd, POLLIN | POLLRDNORM | POLLWRNORM | POLLRDBAND)
 303       != POLLWRNORM)
 304     failed ("expecting POLLWRNORM before writing");
 305
 306   ASSERT (write (wd, "foo", 3) == 3);
 307   if (poll1_wait (rd, POLLIN | POLLRDNORM) != (POLLIN | POLLRDNORM))
 308     failed ("expecting POLLIN | POLLRDNORM after writing");
 309   if (poll1_nowait (rd, POLLIN) != POLLIN)
 310     failed ("expecting POLLIN after writing");
 311   if (poll1_nowait (rd, POLLRDNORM) != POLLRDNORM)
 312     failed ("expecting POLLRDNORM after writing");
 313
 314   ASSERT (read (rd, buf, 3) == 3);
 315 }
 316
 317
 318 /* Test poll(2) on connected sockets.  */
 319
 320 static void
 321 test_socket_pair (void)
 322 {
 323   struct sockaddr_in ia;
 324
 325   socklen_t addrlen = sizeof (ia);
 326   int s = open_server_socket ();
 327   int c1 = connect_to_socket (false);
 328   int c2 = accept (s, (struct sockaddr *) &ia, &addrlen);
 329   ASSERT (s >= 0);
 330   ASSERT (c1 >= 0);
 331   ASSERT (c2 >= 0);
 332
 333   close (s);
 334
 335   test_pair (c1, c2);
 336   close (c1);
 337   ASSERT (write (c2, "foo", 3) == 3);
 338   if ((poll1_nowait (c2, POLLIN | POLLOUT) & (POLLHUP | POLLERR)) == 0)
 339     failed ("expecting POLLHUP after shutdown");
 340
 341   close (c2);
 342 }
 343
 344
 345 /* Test poll(2) on pipes.  */
 346
 347 static void
 348 test_pipe (void)
 349 {
 350   int fd[2];
 351
 352   ASSERT (pipe (fd) >= 0);
 353   test_pair (fd[0], fd[1]);
 354   close (fd[0]);
 355   if ((poll1_wait (fd[1], POLLIN | POLLOUT) & (POLLHUP | POLLERR)) == 0)
 356     failed ("expecting POLLHUP after shutdown");
 357
 358   close (fd[1]);
 359 }
 360
 361
 362 /* Do them all.  */
 363
 364 int
 365 main ()
 366 {
 367   int result;
 368
 369 #ifdef INTERACTIVE
 370   printf ("Please press Enter\n");
 371   test (test_tty, "TTY");
 372 #endif
 373
 374   result = test (test_connect_first, "Unconnected socket test");
 375   result += test (test_socket_pair, "Connected sockets test");
 376   result += test (test_accept_first, "General socket test with fork");
 377   result += test (test_pipe, "Pipe test");
 378
 379   exit (result);
 380 }