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