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         char*  cloned_flags = NULL;
  67
  68         if (argc == 1)
  69                 Usage_and_abort();
  70
  71         while ((c = getopt (argc, argv, "f:m:")) != -1) {
  72                 switch (c) {
  73                 case 'f': {
  74                         char *tmp;
  75
  76                         cloned_flags = (char *)malloc(strlen(optarg)+1);
  77                         if (cloned_flags == NULL) {
  78                                 fprintf(stderr, "Insufficient memory.\n");
  79                                 exit(-1);
  80                         }
  81
  82                         strncpy(cloned_flags, optarg, strlen(optarg)+1);
  83                         for (tmp = strtok(optarg, ":|"); tmp;
  84                              tmp = strtok(NULL, ":|")) {
  85                                 int i = 0;
  86 #ifdef DEBUG
  87                                 printf("flags = %s\n",tmp);
  88 #endif
  89                                 flag_set = 1;
  90                                 for (i = 0; flag_table[i].flag != -1; i++) {
  91                                         if (!strcmp(tmp, flag_table[i].string)){
  92                                                 flags |= flag_table[i].flag;
  93                                                 break;
  94                                         }
  95                                 }
  96
  97                                 if (flag_table[i].flag == -1) {
  98                                         fprintf(stderr, "No such flag: %s\n",
  99                                                 tmp);
 100                                         exit(-1);
 101                                 }
 102                         }
 103 #ifdef DEBUG
 104                         printf("flags = %x\n", flags);
 105 #endif
 106                         break;
 107                 }
 108                 case 'm':
 109 #ifdef DEBUG
 110                         printf("mode = %s\n", optarg);
 111 #endif
 112                         mode = strtol(optarg, NULL, 8);
 113                         mode_set = 1;
 114 #ifdef DEBUG
 115                         printf("mode = %o\n", mode);
 116 #endif
 117                         break;
 118                 default:
 119                         fprintf(stderr, "Bad parameters.\n");
 120                         Usage_and_abort();
 121                 }
 122         }
 123
 124         if (optind == argc) {
 125                 fprintf(stderr, "Bad parameters.\n");
 126                 Usage_and_abort();
 127         }
 128
 129         fname = argv[optind];
 130         file_set = 1;
 131
 132         if (!flag_set || !file_set) {
 133                 fprintf(stderr, "Missing flag or file-name\n");
 134                 exit(-1);
 135         }
 136
 137
 138         if (flags & O_CREAT)
 139                 fd = open(fname, flags, mode);
 140         else
 141                 fd = open(fname, flags);
 142
 143         if (fd != -1) {
 144                 printf("Succeed in opening file \"%s\"(flags=%s",
 145                        fname, cloned_flags);
 146
 147                 if (mode_set)
 148                         printf(", mode=%o", mode);
 149                 printf(")\n");
 150                 close(fd);
 151                 return 0;
 152         }
 153
 154         fprintf(stderr, "Error in opening file \"%s\"(flags=%s",
 155                 fname, cloned_flags);
 156         if (mode_set)
 157                 fprintf(stderr, ", mode=%o", mode);
 158         fprintf(stderr, ") %d: %s\n", errno, strerror(errno));
 159
 160         return errno;
 161 }