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Member "gnuastro-0.9/bootstrapped/tests/test-select-fd.c" (17 Apr 2019, 2326 Bytes) of package /linux/privat/gnuastro-0.9.tar.lz:


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    1 /* Test of select() substitute, reading or writing from a given file descriptor.
    2    Copyright (C) 2008-2019 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 of the License, or
    7    (at your option) 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 Bruno Haible <bruno@clisp.org>, 2008.  */
   18 
   19 #include <config.h>
   20 
   21 #include <stdio.h>
   22 #include <stdlib.h>
   23 #include <sys/select.h>
   24 
   25 int
   26 main (int argc, char *argv[])
   27 {
   28   if (argc == 4)
   29     {
   30       char mode = argv[1][0];
   31 
   32       if (mode == 'r' || mode == 'w')
   33         {
   34           int fd = atoi (argv[2]);
   35 
   36           if (fd >= 0)
   37             {
   38               const char *result_file_name = argv[3];
   39               FILE *result_file = fopen (result_file_name, "wb");
   40 
   41               if (result_file != NULL)
   42                 {
   43                   fd_set fds;
   44                   struct timeval timeout;
   45                   int ret;
   46 
   47                   FD_ZERO (&fds);
   48                   FD_SET (fd, &fds);
   49                   timeout.tv_sec = 0;
   50                   timeout.tv_usec = 10000;
   51                   ret = (mode == 'r'
   52                          ? select (fd + 1, &fds, NULL, NULL, &timeout)
   53                          : select (fd + 1, NULL, &fds, NULL, &timeout));
   54                   if (ret < 0)
   55                     {
   56                       perror ("select failed");
   57                       exit (1);
   58                     }
   59                   if ((ret == 0) != ! FD_ISSET (fd, &fds))
   60                     {
   61                       fprintf (stderr, "incorrect return value\n");
   62                       exit (1);
   63                     }
   64                   fprintf (result_file, "%d\n", ret);
   65                   exit (0);
   66                 }
   67             }
   68         }
   69     }
   70   fprintf (stderr, "Usage: test-select-fd mode fd result-file-name\n");
   71   exit (1);
   72 }