1 /* Test posix_spawn_file_actions_addclose() function. 2 Copyright (C) 2011-2021 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 #include <config.h> 18 19 #include <spawn.h> 20 21 #include "signature.h" 22 SIGNATURE_CHECK (posix_spawn_file_actions_addclose, int, 23 (posix_spawn_file_actions_t *, int)); 24 25 #include <errno.h> 26 #include <limits.h> 27 #include <unistd.h> 28 29 #include "macros.h" 30 31 /* Return a file descriptor that is too big to use. 32 Prefer the smallest such fd, except use OPEN_MAX if it is defined 33 and is greater than getdtablesize (), as that's how OS X works. */ 34 static int 35 big_fd (void) /* */ 36 { 37 int fd = getdtablesize (); 38 #ifdef OPEN_MAX 39 if (fd < OPEN_MAX) 40 fd = OPEN_MAX; 41 #endif 42 return fd; 43 } 44 45 int 46 main (void) /* */ 47 { 48 posix_spawn_file_actions_t actions; 49 50 ASSERT (posix_spawn_file_actions_init (&actions) == 0); 51 52 /* Test behaviour for invalid file descriptors. */ 53 { 54 errno = 0; 55 ASSERT (posix_spawn_file_actions_addclose (&actions, -1) == EBADF); 56 } 57 /* This behaviour is not mandated by POSIX, but happens to pass on all 58 platforms. */ 59 { 60 int bad_fd = big_fd (); 61 errno = 0; 62 ASSERT (posix_spawn_file_actions_addclose (&actions, bad_fd) == EBADF); 63 } 64 65 posix_spawn_file_actions_destroy (&actions); 66 67 return 0; 68 }