| /* mmapcat.c - derived from source by misiek@pld.ORG.PL */ |
| |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| |
| int main(int argc, char **argv) |
| { |
| int fd; |
| char *ptr, *ptr2; |
| struct stat st; |
| |
| fd=open(argv[1],O_RDONLY); |
| if(fd<0) { |
| perror(argv[1]); |
| exit(1); |
| } |
| fstat(fd,&st); |
| if(st.st_size%4096==0) { |
| fprintf(stderr,"bad file size!\n"); |
| exit(1); |
| } |
| |
| ptr2 = ptr = mmap(NULL,st.st_size,PROT_READ,MAP_PRIVATE,fd,0); |
| while (*ptr!=0) ptr++; |
| write(1,ptr2,ptr - ptr2); |
| exit(0); |
| } |
| |