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 <linux/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        {"O_DIRECT", O_DIRECT},
  40        {"O_LARGEFILE", O_LARGEFILE},
  41        {"O_DIRECTORY", O_DIRECTORY},
  42        {"O_NOFOLLOW", O_NOFOLLOW},
  43        {"O_LOV_DELAY_CREATE", O_LOV_DELAY_CREATE},
  44        {"", -1}
  45 };
  46
  47 void Usage_and_abort(void)
  48 {
  49        fprintf(stderr, "Usage: openfile -f flags [ -m mode ] filename \n");
  50        fprintf(stderr, "e.g. openfile -f O_RDWR:O_CREAT -m 0755 /etc/passwd\n");
  51        exit(-1);
  52 }
  53
  54 int main(int argc, char** argv)
  55 {
  56         int    fd;
  57         int    flags=0;
  58         mode_t mode=0644;
  59         char*  fname=NULL;
  60         int    mode_set=0;
  61         int    flag_set=0;
  62         int    file_set=0;
  63         char   c;
  64         char*  cloned_flags;
  65
  66         if (argc == 1)
  67                 Usage_and_abort();
  68
  69         while ((c = getopt (argc, argv, "f:m:")) != -1) {
  70                 switch (c) {
  71                 case 'f': {
  72                         char *tmp;
  73
  74                         cloned_flags = (char *)malloc(strlen(optarg)+1);
  75                         if (cloned_flags == NULL) {
  76                                 fprintf(stderr, "Insufficient memory.\n");
  77                                 exit(-1);
  78                         }
  79
  80                         strncpy(cloned_flags, optarg, strlen(optarg)+1);
  81                         for (tmp = strtok(optarg, ":|"); tmp;
  82                              tmp = strtok(NULL, ":|")) {
  83                                 int i = 0;
  84 #ifdef DEBUG
  85                                 printf("flags = %s\n",tmp);
  86 #endif
  87                                 flag_set = 1;
  88                                 for (i = 0; flag_table[i].flag != -1; i++) {
  89                                         if (!strcmp(tmp, flag_table[i].string)){
  90                                                 flags |= flag_table[i].flag;
  91                                                 break;
  92                                         }
  93                                 }
  94
  95                                 if (flag_table[i].flag == -1) {
  96                                         fprintf(stderr, "No such flag: %s\n",
  97                                                 tmp);
  98                                         exit(-1);
  99                                 }
 100                         }
 101 #ifdef DEBUG
 102                         printf("flags = %x\n", flags);
 103 #endif
 104                         break;
 105                 }
 106                 case 'm':
 107 #ifdef DEBUG
 108                         printf("mode = %s\n", optarg);
 109 #endif
 110                         mode = strtol(optarg, NULL, 8);
 111                         mode_set = 1;
 112 #ifdef DEBUG
 113                         printf("mode = %o\n", mode);
 114 #endif
 115                         break;
 116                 default:
 117                         fprintf(stderr, "Bad parameters.\n");
 118                         Usage_and_abort();
 119                 }
 120         }
 121
 122         if (optind == argc) {
 123                 fprintf(stderr, "Bad parameters.\n");
 124                 Usage_and_abort();
 125         }
 126
 127         fname = argv[optind];
 128         file_set = 1;
 129
 130         if (!flag_set || !file_set) {
 131                 fprintf(stderr, "Missing flag or file-name\n");
 132                 exit(-1);
 133         }
 134
 135
 136         if (flags & O_CREAT)
 137                 fd = open(fname, flags, mode);
 138         else
 139                 fd = open(fname, flags);
 140
 141         if (fd != -1) {
 142                 printf("Succeed in opening file \"%s\"(flags=%s",
 143                        fname, cloned_flags);
 144
 145                 if (mode_set)
 146                         printf(", mode=%o", mode);
 147                 printf(")\n");
 148                 close(fd);
 149                 return 0;
 150         }
 151
 152         fprintf(stderr, "Error in opening file \"%s\"(flags=%s",
 153                 fname, cloned_flags);
 154         if (mode_set)
 155                 fprintf(stderr, ", mode=%o", mode);
 156         fprintf(stderr, ") %d: %s\n", errno, strerror(errno));
 157
 158         return errno;
 159 }