lustre/tests/openfile.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #if 0
   6 #define DEBUG
   7 #endif
   8
   9 /* for O_DIRECTORY and O_DIRECT */
  10 #ifndef _GNU_SOURCE
  11 #define _GNU_SOURCE
  12 #endif
  13
  14 #include <stdio.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <string.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <lustre/lustre_user.h>
  23
  24 typedef struct flag_mapping {
  25        const char *string;
  26        const int  flag;
  27 } FLAG_MAPPING;
  28
  29 FLAG_MAPPING flag_table[] = {
  30        {"O_RDONLY", O_RDONLY},
  31        {"O_WRONLY", O_WRONLY},
  32        {"O_RDWR", O_RDWR},
  33        {"O_CREAT", O_CREAT},
  34        {"O_EXCL", O_EXCL},
  35        {"O_NOCTTY", O_NOCTTY},
  36        {"O_TRUNC", O_TRUNC},
  37        {"O_APPEND", O_APPEND},
  38        {"O_NONBLOCK", O_NONBLOCK},
  39        {"O_NDELAY", O_NDELAY},
  40        {"O_SYNC", O_SYNC},
  41 #ifdef O_DIRECT
  42        {"O_DIRECT", O_DIRECT},
  43 #endif
  44        {"O_LARGEFILE", O_LARGEFILE},
  45        {"O_DIRECTORY", O_DIRECTORY},
  46        {"O_NOFOLLOW", O_NOFOLLOW},
  47        {"O_LOV_DELAY_CREATE", O_LOV_DELAY_CREATE},
  48        {"", -1}
  49 };
  50
  51 void Usage_and_abort(void)
  52 {
  53        fprintf(stderr, "Usage: openfile -f flags [ -m mode ] filename \n");
  54        fprintf(stderr, "e.g. openfile -f O_RDWR:O_CREAT -m 0755 /etc/passwd\n");
  55        exit(-1);
  56 }
  57
  58 int main(int argc, char** argv)
  59 {
  60         int    fd;
  61         int    flags=0;
  62         mode_t mode=0644;
  63         char*  fname=NULL;
  64         int    mode_set=0;
  65         int    flag_set=0;
  66         int    file_set=0;
  67         int    c;
  68         int    save_errno;
  69         char*  cloned_flags = NULL;
  70
  71         if (argc == 1)
  72                 Usage_and_abort();
  73
  74         while ((c = getopt (argc, argv, "f:m:")) != -1) {
  75                 switch (c) {
  76                 case 'f': {
  77                         char *tmp;
  78
  79                         cloned_flags = (char *)malloc(strlen(optarg)+1);
  80                         if (cloned_flags == NULL) {
  81                                 fprintf(stderr, "Insufficient memory.\n");
  82                                 exit(-1);
  83                         }
  84
  85                         strncpy(cloned_flags, optarg, strlen(optarg)+1);
  86                         flags = atoi(cloned_flags);
  87                         if (flags > 0) {
  88                                 flag_set = 1;
  89 #ifdef DEBUG
  90                                 printf("flags = %d\n",flags);
  91 #endif
  92                                 break;
  93                         } else
  94                                 flags = 0;
  95
  96                         for (tmp = strtok(cloned_flags, ":|"); tmp;
  97                              tmp = strtok(NULL, ":|")) {
  98                                 int i = 0;
  99 #ifdef DEBUG
 100                                 printf("flags = %s\n",tmp);
 101 #endif
 102                                 flag_set = 1;
 103                                 for (i = 0; flag_table[i].flag != -1; i++) {
 104                                         if (!strcmp(tmp, flag_table[i].string)){
 105                                                 flags |= flag_table[i].flag;
 106                                                 break;
 107                                         }
 108                                 }
 109
 110                                 if (flag_table[i].flag == -1) {
 111                                         fprintf(stderr, "No such flag: %s\n",
 112                                                 tmp);
 113                                         exit(-1);
 114                                 }
 115                         }
 116                         free(cloned_flags);
 117 #ifdef DEBUG
 118                         printf("flags = %x\n", flags);
 119 #endif
 120                         break;
 121                 }
 122                 case 'm':
 123 #ifdef DEBUG
 124                         printf("mode = %s\n", optarg);
 125 #endif
 126                         mode = strtol(optarg, NULL, 8);
 127                         mode_set = 1;
 128 #ifdef DEBUG
 129                         printf("mode = %o\n", mode);
 130 #endif
 131                         break;
 132                 default:
 133                         fprintf(stderr, "Bad parameters.\n");
 134                         Usage_and_abort();
 135                 }
 136         }
 137
 138         if (optind == argc) {
 139                 fprintf(stderr, "Bad parameters.\n");
 140                 Usage_and_abort();
 141         }
 142
 143         fname = argv[optind];
 144         file_set = 1;
 145
 146         if (!flag_set || !file_set) {
 147                 fprintf(stderr, "Missing flag or file-name\n");
 148                 exit(-1);
 149         }
 150
 151
 152         if (flags & O_CREAT)
 153                 fd = open(fname, flags, mode);
 154         else
 155                 fd = open(fname, flags);
 156
 157         save_errno = errno;
 158
 159         if (fd != -1) {
 160                 printf("Succeed in opening file \"%s\"(flags=%s",
 161                        fname, cloned_flags);
 162
 163                 if (mode_set)
 164                         printf(", mode=%o", mode);
 165                 printf(")\n");
 166                 close(fd);
 167                 return 0;
 168         }
 169
 170         fprintf(stderr, "Error in opening file \"%s\"(flags=%s",
 171                 fname, cloned_flags);
 172         if (mode_set)
 173                 fprintf(stderr, ", mode=%o", mode);
 174         fprintf(stderr, ") %d: %s\n", save_errno, strerror(save_errno));
 175
 176         return save_errno;
 177 }