1 /* 2 * $DragonFly: src/tools/regression/nfsmmap/test1/test1.c,v 1.2 2003/11/07 14:38:38 eirikn Exp $ 3 */ 4 5 #include <sys/types.h> 6 #include <sys/fcntl.h> 7 #include <sys/mman.h> 8 #include <unistd.h> 9 10 int main(int argc, char** argv) 11 { 12 int fd, fd2; 13 caddr_t addr; 14 char zeros[4096]; 15 char ones[200]; 16 17 memset(zeros, 0, sizeof zeros); 18 memset(ones, 1, sizeof ones); 19 #if 0 20 unlink("test1.data"); 21 fd = open("test1.data", O_RDWR|O_CREAT, 0666); 22 if (fd < 0) 23 err(1, "creating file"); 24 if (write(fd, zeros, sizeof zeros) < 0) 25 err(1, "writing zeros"); 26 close(fd); 27 #endif 28 29 fd = open("test1.data", O_RDWR); 30 if (fd < 0) 31 err(1, "opening file"); 32 if (lseek(fd, 600, SEEK_SET) < 0) 33 err(1, "seeking"); 34 35 if (write(fd, ones, sizeof ones) < 0) 36 err(1, "writing ones"); 37 38 fsync(fd); 39 40 addr = mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 41 if (addr == MAP_FAILED) 42 err(1, "mapping"); 43 unlink("test1.scratch"); 44 fd2 = open("test1.scratch", O_RDWR|O_CREAT, 0666); 45 if (fd2 < 0) 46 err(1, "creating scratch"); 47 48 if (write(fd2, addr, 4096) < 0) 49 err(1, "writing scratch"); 50 } 51