1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * NAME 22 * hugetlb.c 23 * 24 * DESCRIPTION 25 * common routines for the hugepage tests. 26 * 27 * The library contains the following routines: 28 * 29 * check_hugepage() 30 * getipckey() 31 * getuserid() 32 * rm_shm() 33 */ 34 35 #include <sys/types.h> 36 #include <sys/ipc.h> 37 #include <sys/shm.h> 38 #include <sys/timeb.h> 39 #include <pwd.h> 40 #include "hugetlb.h" 41 42 void check_hugepage(void) 43 { 44 if (access(PATH_HUGEPAGES, F_OK)) 45 tst_brkm(TCONF, NULL, "Huge page is not supported."); 46 } 47 48 /* 49 * getipckey() - generates and returns a message key used by the "get" 50 * calls to create an IPC resource. 51 */ 52 int getipckey(void (*cleanup_fn) (void)) 53 { 54 const char a = 'a'; 55 int ascii_a = (int)a; 56 char *curdir = NULL; 57 size_t size = 0; 58 key_t ipc_key; 59 struct timeb time_info; 60 61 curdir = getcwd(curdir, size); 62 if (curdir == NULL) 63 tst_brkm(TBROK | TERRNO, cleanup_fn, "getcwd(curdir)"); 64 65 /* 66 * Get a Sys V IPC key 67 * 68 * ftok() requires a character as a second argument. This is 69 * refered to as a "project identifier" in the man page. In 70 * order to maximize the chance of getting a unique key, the 71 * project identifier is a "random character" produced by 72 * generating a random number between 0 and 25 and then adding 73 * that to the ascii value of 'a'. The "seed" for the random 74 * number is the millisecond value that is set in the timeb 75 * structure after calling ftime(). 76 */ 77 ftime(&time_info); 78 srandom((unsigned int)time_info.millitm); 79 80 ipc_key = ftok(curdir, ascii_a + random() % 26); 81 if (ipc_key == -1) 82 tst_brkm(TBROK | TERRNO, cleanup_fn, "ftok"); 83 84 return ipc_key; 85 } 86 87 /* 88 * getuserid() - return the integer value for the "user" id 89 */ 90 int getuserid(void (*cleanup_fn) (void), char *user) 91 { 92 struct passwd *ent; 93 94 ent = getpwnam(user); 95 if (ent == NULL) 96 tst_brkm(TBROK | TERRNO, cleanup_fn, "getpwnam"); 97 98 return ent->pw_uid; 99 } 100 101 /* 102 * rm_shm() - removes a shared memory segment. 103 */ 104 void rm_shm(int shm_id) 105 { 106 if (shm_id == -1) 107 return; 108 109 /* 110 * check for # of attaches ? 111 */ 112 if (shmctl(shm_id, IPC_RMID, NULL) == -1) { 113 tst_resm(TINFO, "WARNING: shared memory deletion failed."); 114 tst_resm(TINFO, "This could lead to IPC resource problems."); 115 tst_resm(TINFO, "id = %d", shm_id); 116 } 117 } 118
