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1 : /* Tests of unsetenv. 2 : Copyright (C) 2009-2020 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 1 : main (void) 34 : { 35 1 : char entry[] = "b=2"; 36 : 37 : /* Test removal when multiple entries present. */ 38 1 : ASSERT (putenv ((char *) "a=1") == 0); 39 1 : ASSERT (putenv (entry) == 0); 40 1 : entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point. */ 41 1 : ASSERT (unsetenv ("a") == 0); /* Both entries will be removed. */ 42 1 : ASSERT (getenv ("a") == NULL); 43 1 : ASSERT (unsetenv ("a") == 0); 44 : 45 : /* Required to fail with EINVAL. */ 46 1 : errno = 0; 47 1 : ASSERT (unsetenv ("") == -1); 48 1 : ASSERT (errno == EINVAL); 49 1 : errno = 0; 50 1 : ASSERT (unsetenv ("a=b") == -1); 51 1 : 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 1 : return 0; 61 : }