1 /* Tests of unsetenv. 2 Copyright (C) 2009-2021 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 Eric Blake <ebb9@byu.net>, 2009. */ 18 19 #include <config.h> 20 21 #include <stdlib.h> 22 23 #include "signature.h" 24 SIGNATURE_CHECK (unsetenv, int, (char const *)); 25 26 #include <errno.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #include "macros.h" 31 32 int 33 main (void) /* */ 34 { 35 char entry[] = "b=2"; 36 37 /* Test removal when multiple entries present. */ 38 ASSERT (putenv ((char *) "a=1") == 0); 39 ASSERT (putenv (entry) == 0); 40 entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point. */ 41 ASSERT (unsetenv ("a") == 0); /* Both entries will be removed. */ 42 ASSERT (getenv ("a") == NULL); 43 ASSERT (unsetenv ("a") == 0); 44 45 /* Required to fail with EINVAL. */ 46 errno = 0; 47 ASSERT (unsetenv ("") == -1); 48 ASSERT (errno == EINVAL); 49 errno = 0; 50 ASSERT (unsetenv ("a=b") == -1); 51 ASSERT (errno == EINVAL); 52 #if 0 53 /* glibc and gnulib's implementation guarantee this, but POSIX no 54 longer requires it: http://austingroupbugs.net/view.php?id=185 */ 55 errno = 0; 56 ASSERT (unsetenv (NULL) == -1); 57 ASSERT (errno == EINVAL); 58 #endif 59 60 return 0; 61 }