?? mapper.c
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/* * mapper.c -- simple file that mmap()s a file region and prints it * * Tested with 1.2 on the x86 * Tested with 2.0 on the x86, Sparc and Alpha * * Actually, it should run with any Unix */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/mman.h>#include <errno.h>int main(int argc, char **argv){ char *fname; FILE *f; unsigned int offset, len; void *address; if (argc !=4 || sscanf(argv[2],"%i", &offset) != 1 || sscanf(argv[3],"%i", &len) != 1) { fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n", argv[0], argv[0]); exit(1); } 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 %i to %i\n", fname, offset, offset+len); fwrite(address, 1, len, stdout); return 0;}
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