/* * mapper.c -- simple file that mmap()s a file region and prints it * * Copyright (C) 1998,2000,2001 Alessandro Rubini * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/mman.h>#include <errno.h>#include <limits.h>int main(int argc, char **argv){ char *fname; FILE *f; unsigned long offset, len; void *address; if (argc !=4 || sscanf(argv[2],"%li", &offset) != 1 || sscanf(argv[3],"%li", &len) != 1) { fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n", argv[0], argv[0]); exit(1); } /* the offset might be big (e.g., PCI devices), but conversion trims it */ if (offset == INT_MAX) {if (argv[2][1]=='x') sscanf(argv[2]+2, "%lx", &offset); else sscanf(argv[2], "%lu", &offset); } fname=argv[1]; if (!(f=fopen(fname,"r"))) { fprintf(stderr, "%s: %s: %s\n", argv[0], fname, strerror(errno)); exit(1); } address=mmap(0, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fileno(f), offset); if (address == (void *)-1) { fprintf(stderr,"%s: mmap(): %s\n",argv[0],strerror(errno)); exit(1); } fclose(f); fprintf(stderr, "mapped \"%s\" from %lu (0x%08lx) to %lu (0x%08lx)\n", fname, offset, offset, offset+len, offset+len); fwrite(address, 1, len, stdout);pause(); return 0;}
