1 /* 2 * Copyright (c) International Business Machines Corp., 2001 3 * 07/2001 Ported by Wayne Boyer 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 Foundation, 17 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * 1. creat() a file using 0444 mode, write to the fildes, write 22 * should return a positive count. 23 * 24 * 2. creat() should truncate a file to 0 bytes if it already 25 * exists, and should not fail. 26 * 27 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <fcntl.h> 32 #include <stdio.h> 33 34 #include "tst_test.h" 35 36 static char filename[40]; 37 static int fd; 38 39 void setup(void) 40 { 41 sprintf(filename, "creat01.%d", getpid()); 42 } 43 44 struct tcase { 45 int mode; 46 } tcases[] = { 47 {0644}, 48 {0444} 49 }; 50 51 static void verify_creat(unsigned int i) 52 { 53 struct stat buf; 54 char c; 55 56 fd = creat(filename, tcases[i].mode); 57 58 if (fd == -1) 59 tst_brk(TBROK | TERRNO, "creat() failed"); 60 61 SAFE_STAT(filename, &buf); 62 63 if (buf.st_size != 0) 64 tst_res(TFAIL, "creat() failed to truncate file to 0 bytes"); 65 else 66 tst_res(TPASS, "creat() truncated file to 0 bytes"); 67 68 if (write(fd, "A", 1) != 1) 69 tst_res(TFAIL | TERRNO, "write was unsuccessful"); 70 else 71 tst_res(TPASS, "file was created and written to successfully"); 72 73 if (read(fd, &c, 1) != -1) 74 tst_res(TFAIL, "read succeeded unexpectedly"); 75 else 76 tst_res(TPASS | TERRNO, "read failed expectedly"); 77 78 SAFE_CLOSE(fd); 79 } 80 81 static void cleanup(void) 82 { 83 if (fd > 0) 84 SAFE_CLOSE(fd); 85 } 86 87 static struct tst_test test = { 88 .tid = "creat01", 89 .tcnt = 2, 90 .test = verify_creat, 91 .needs_tmpdir = 1, 92 .cleanup = cleanup, 93 .setup = setup, 94 }; 95
