lustre/tests/openfile.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * This file is part of Lustre, http://www.lustre.org/
  28  * Lustre is a trademark of Sun Microsystems, Inc.
  29  */
  30
  31 /* for O_DIRECTORY and O_DIRECT */
  32 #ifndef _GNU_SOURCE
  33 #define _GNU_SOURCE
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <fcntl.h>
  40 #include <errno.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <linux/lustre/lustre_user.h>
  45
  46 typedef struct flag_mapping {
  47         const char *string;
  48         const int  flag;
  49 } FLAG_MAPPING;
  50
  51 FLAG_MAPPING flag_table[] = {
  52         {"O_RDONLY", O_RDONLY},
  53         {"O_WRONLY", O_WRONLY},
  54         {"O_RDWR", O_RDWR},
  55         {"O_CREAT", O_CREAT},
  56         {"O_EXCL", O_EXCL},
  57         {"O_NOCTTY", O_NOCTTY},
  58         {"O_TRUNC", O_TRUNC},
  59         {"O_APPEND", O_APPEND},
  60         {"O_NONBLOCK", O_NONBLOCK},
  61         {"O_NDELAY", O_NDELAY},
  62         {"O_SYNC", O_SYNC},
  63 #ifdef O_DIRECT
  64         {"O_DIRECT", O_DIRECT},
  65 #endif
  66         {"O_LARGEFILE", O_LARGEFILE},
  67         {"O_DIRECTORY", O_DIRECTORY},
  68         {"O_NOFOLLOW", O_NOFOLLOW},
  69         {"O_LOV_DELAY_CREATE", O_LOV_DELAY_CREATE},
  70         {"", -1}
  71 };
  72
  73 void Usage_and_abort(void)
  74 {
  75         fprintf(stderr, "Usage: openfile -f flags [ -m mode ] filename\n");
  76         fprintf(stderr,
  77                 "e.g. openfile -f O_RDWR:O_CREAT -m 0755 /etc/passwd\n");
  78         exit(-1);
  79 }
  80
  81 int main(int argc, char **argv)
  82 {
  83         int fd;
  84         int flags = 0;
  85         mode_t mode = 0644;
  86         char *fname = NULL;
  87         int mode_set = 0;
  88         int flag_set = 0;
  89         int c;
  90         int save_errno = 0;
  91         int print_usage = 0;
  92         char *cloned_flags = NULL;
  93
  94         if (argc == 1)
  95                 Usage_and_abort();
  96
  97         while ((c = getopt(argc, argv, "f:m:")) != -1) {
  98                 switch (c) {
  99                 case 'f': {
 100                         char *tmp;
 101
 102                         cloned_flags = strdup(optarg);
 103                         if (!cloned_flags) {
 104                                 fprintf(stderr, "Insufficient memory.\n");
 105                                 save_errno = -1;
 106                                 goto out;
 107                         }
 108
 109                         flags = atoi(cloned_flags);
 110                         if (flags > 0) {
 111                                 flag_set = 1;
 112 #ifdef DEBUG
 113                                 printf("flags = %d\n", flags);
 114 #endif
 115                                 break;
 116                         }
 117
 118                         flags = 0;
 119
 120                         for (tmp = strtok(cloned_flags, ":|"); tmp;
 121                              tmp = strtok(NULL, ":|")) {
 122                                 int i = 0;
 123 #ifdef DEBUG
 124                                 printf("flags = %s\n", tmp);
 125 #endif
 126                                 flag_set = 1;
 127                                 for (i = 0; flag_table[i].flag != -1; i++) {
 128                                         if (!strcmp(tmp,
 129                                                     flag_table[i].string)) {
 130                                                 flags |= flag_table[i].flag;
 131                                                 break;
 132                                         }
 133                                 }
 134
 135                                 if (flag_table[i].flag == -1) {
 136                                         fprintf(stderr, "No such flag: %s\n",
 137                                                 tmp);
 138                                         save_errno = -1;
 139                                         goto out;
 140                                 }
 141                         }
 142 #ifdef DEBUG
 143                         printf("flags = %x\n", flags);
 144 #endif
 145                         break;
 146                 }
 147                 case 'm':
 148 #ifdef DEBUG
 149                         printf("mode = %s\n", optarg);
 150 #endif
 151                         mode = strtol(optarg, NULL, 8);
 152                         mode_set = 1;
 153 #ifdef DEBUG
 154                         printf("mode = %o\n", mode);
 155 #endif
 156                         break;
 157                 default:
 158                         fprintf(stderr, "Bad parameters.\n");
 159                         print_usage = 1;
 160                         goto out;
 161                 }
 162         }
 163
 164         if (optind == argc) {
 165                 fprintf(stderr, "Bad parameters.\n");
 166                 print_usage = 1;
 167                 goto out;
 168         }
 169
 170         fname = argv[optind];
 171
 172         if (!flag_set) {
 173                 fprintf(stderr, "Missing flag or file-name\n");
 174                 save_errno = -1;
 175                 goto out;
 176         }
 177
 178         if (flags & O_CREAT)
 179                 fd = open(fname, flags, mode);
 180         else
 181                 fd = open(fname, flags);
 182
 183         save_errno = errno;
 184
 185         if (fd != -1) {
 186                 printf("Succeed in opening file \"%s\"(flags=%s",
 187                        fname, cloned_flags);
 188
 189                 if (mode_set)
 190                         printf(", mode=%o", mode);
 191                 printf(")\n");
 192                 close(fd);
 193         } else {
 194                 fprintf(stderr, "Error in opening file \"%s\"(flags=%s",
 195                         fname, cloned_flags);
 196                 if (mode_set)
 197                         fprintf(stderr, ", mode=%o", mode);
 198                 fprintf(stderr, ") %d: %s\n", save_errno, strerror(save_errno));
 199         }
 200 out:
 201         if (cloned_flags)
 202                 free(cloned_flags);
 203         if (print_usage)
 204                 Usage_and_abort();
 205
 206         return save_errno;
 207 }