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fioclient.c

/*
  FUSE fioclient: FUSE ioctl example client
  Copyright (C) 2008       SUSE Linux Products GmbH
  Copyright (C) 2008       Tejun Heo <teheo@suse.de>

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.

  gcc -Wall fioclient.c -o fioclient
*/

#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "fioc.h"

const char *usage =
"Usage: fioclient FIOC_FILE COMMAND\n"
"\n"
"COMMANDS\n"
"  s [SIZE]     : get size if SIZE is omitted, set size otherwise\n"
"  r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n"
"  w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\n"
"\n";

static int do_rw(int fd, int is_read, size_t size, off_t offset,
             size_t *prev_size, size_t *new_size)
{
      struct fioc_rw_arg arg = { .offset = offset };
      ssize_t ret;

      arg.buf = calloc(1, size);
      if (!arg.buf) {
            fprintf(stderr, "failed to allocated %zu bytes\n", size);
            return -1;
      }

      if (is_read) {
            arg.size = size;
            ret = ioctl(fd, FIOC_READ, &arg);
            if (ret >= 0)
                  fwrite(arg.buf, 1, ret, stdout);
      } else {
            arg.size = fread(arg.buf, 1, size, stdin);
            fprintf(stderr, "Writing %zu bytes\n", arg.size);
            ret = ioctl(fd, FIOC_WRITE, &arg);
      }

      if (ret >= 0) {
            *prev_size = arg.prev_size;
            *new_size = arg.new_size;
      } else
            perror("ioctl");

      free(arg.buf);
      return ret;
}

int main(int argc, char **argv)
{
      size_t param[2] = { };
      size_t size, prev_size = 0, new_size = 0;
      char cmd;
      int fd, i, rc;

      if (argc < 3)
            goto usage;

      fd = open(argv[1], O_RDWR);
      if (fd < 0) {
            perror("open");
            return 1;
      }

      cmd = tolower(argv[2][0]);
      argc -= 3;
      argv += 3;

      for (i = 0; i < argc; i++) {
            char *endp;
            param[i] = strtoul(argv[i], &endp, 0);
            if (endp == argv[i] || *endp != '\0')
                  goto usage;
      }

      switch (cmd) {
      case 's':
            if (!argc) {
                  if (ioctl(fd, FIOC_GET_SIZE, &size)) {
                        perror("ioctl");
                        return 1;
                  }
                  printf("%zu\n", size);
            } else {
                  size = param[0];
                  if (ioctl(fd, FIOC_SET_SIZE, &size)) {
                        perror("ioctl");
                        return 1;
                  }
            }
            return 0;

      case 'r':
      case 'w':
            rc = do_rw(fd, cmd == 'r', param[0], param[1],
                     &prev_size, &new_size);
            if (rc < 0)
                  return 1;
            fprintf(stderr, "transferred %d bytes (%zu -> %zu)\n",
                  rc, prev_size, new_size);
            return 0;
      }

 usage:
      fprintf(stderr, usage);
      return 1;
}

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