/* Test of select() substitute, reading or writing from a given file descriptor.
- Copyright (C) 2008 Free Software Foundation, Inc.
+ Copyright (C) 2008-2011 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
char mode = argv[1][0];
if (mode == 'r' || mode == 'w')
- {
- int fd = atoi (argv[2]);
+ {
+ int fd = atoi (argv[2]);
- if (fd >= 0)
- {
- const char *result_file_name = argv[3];
- FILE *result_file = fopen (result_file_name, "wb");
+ if (fd >= 0)
+ {
+ const char *result_file_name = argv[3];
+ FILE *result_file = fopen (result_file_name, "wb");
- if (result_file != NULL)
- {
- fd_set fds;
- struct timeval timeout;
- int ret;
+ if (result_file != NULL)
+ {
+ fd_set fds;
+ struct timeval timeout;
+ int ret;
- FD_ZERO (&fds);
- FD_SET (fd, &fds);
- timeout.tv_sec = 0;
- timeout.tv_usec = 10000;
- ret = (mode == 'r'
- ? select (fd + 1, &fds, NULL, NULL, &timeout)
- : select (fd + 1, NULL, &fds, NULL, &timeout));
- if (ret < 0)
- {
- perror ("select failed");
- exit (1);
- }
- if ((ret == 0) != ! FD_ISSET (fd, &fds))
- {
- fprintf (stderr, "incorrect return value\n");
- exit (1);
- }
- fprintf (result_file, "%d\n", ret);
- exit (0);
- }
- }
- }
+ FD_ZERO (&fds);
+ FD_SET (fd, &fds);
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 10000;
+ ret = (mode == 'r'
+ ? select (fd + 1, &fds, NULL, NULL, &timeout)
+ : select (fd + 1, NULL, &fds, NULL, &timeout));
+ if (ret < 0)
+ {
+ perror ("select failed");
+ exit (1);
+ }
+ if ((ret == 0) != ! FD_ISSET (fd, &fds))
+ {
+ fprintf (stderr, "incorrect return value\n");
+ exit (1);
+ }
+ fprintf (result_file, "%d\n", ret);
+ exit (0);
+ }
+ }
+ }
}
fprintf (stderr, "Usage: test-select-fd mode fd result-file-name\n");
exit (1);