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