1 /* Test of <sys/select.h> substitute. 2 Copyright (C) 2007-2021 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>, 2007. */ 18 19 #include <config.h> 20 21 #include <sys/select.h> 22 23 #include "signature.h" 24 25 /* The following may be macros without underlying functions, so only 26 check signature if they are not macros. */ 27 #ifndef FD_CLR 28 SIGNATURE_CHECK (FD_CLR, void, (int, fd_set *)); 29 #endif 30 #ifndef FD_ISSET 31 SIGNATURE_CHECK (FD_ISSET, void, (int, fd_set *)); 32 #endif 33 #ifndef FD_SET 34 SIGNATURE_CHECK (FD_SET, int, (int, fd_set *)); 35 #endif 36 #ifndef FD_ZERO 37 SIGNATURE_CHECK (FD_ZERO, void, (fd_set *)); 38 #endif 39 40 /* Check that the 'struct timeval' type is defined. */ 41 struct timeval a; 42 43 /* Check that a.tv_sec is wide enough to hold a time_t, ignoring 44 signedness issues. */ 45 typedef int verify_tv_sec_type[sizeof (time_t) <= sizeof (a.tv_sec) ? 1 : -1]; 46 47 /* Check that sigset_t is defined. */ 48 sigset_t t2; 49 50 int 51 main (void) /* */ 52 { 53 /* Check that FD_ZERO can be used. This should not yield a warning 54 such as "warning: implicit declaration of function 'memset'". */ 55 fd_set fds; 56 FD_ZERO (&fds); 57 58 return 0; 59 }