int main(int argc ,char*argv[]) { int fd; // int ret; char*msg; int choice; int ret1; int ret; fd=open(argv[1],O_RDWR|O_CREAT,0666); if(fd==-1) { perror(" "); exit(1); } // ioctl(fd, IOCTL_SET_MSG,"vishnu"); // ret=ioctl(fd,IOCTL_SET,msg); // printf("IOCTL_SET_MSG=%d\n",DN_SETCOUNT); printf("1.WRITE\t 2.READ\t 3. EXIT\n"); while(1) { printf("enter choice\n"); scanf("%d",&choice); __fpurge(stdin);; switch(choice) { case 1: printf("in user write\n"); ioctl(fd,IOCTL_SET_MSG,"prashant"); if(ret==-1) { perror(" "); exit(2); } break; case 2: printf("in user read\n"); ret1=ioctl_get_msg(fd); if(ret1==-1) { perror(" "); exit(1); } break; case 3: exit(1); } } }
int main(int argc, char **argv) { int fd, error = 0; char zvol_name[ZFS_MAXNAMELEN], zvol_name_part[ZFS_MAXNAMELEN]; char *dev_name; struct stat statbuf; int dev_minor, dev_part; int i; if (argc < 2) { printf("Usage: %s /dev/zvol_device_node\n", argv[0]); return (EINVAL); } dev_name = argv[1]; error = stat(dev_name, &statbuf); if (error != 0) { printf("Unable to access device file: %s\n", dev_name); return (errno); } dev_minor = minor(statbuf.st_rdev); dev_part = dev_minor % ZVOL_MINORS; fd = open(dev_name, O_RDONLY); if (fd < 0) { printf("Unable to open device file: %s\n", dev_name); return (errno); } error = ioctl_get_msg(zvol_name, fd); if (error < 0) { printf("ioctl_get_msg failed:%s\n", strerror(errno)); return (errno); } if (dev_part > 0) snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s-part%d", zvol_name, dev_part); else snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s", zvol_name); for (i = 0; i < strlen(zvol_name_part); i++) { if (isblank(zvol_name_part[i])) zvol_name_part[i] = '+'; } printf("%s\n", zvol_name_part); close(fd); return (error); }
main () { int file_desc, ret_val; char *msg = "Message passed by ioctl\n"; file_desc = open(DEVICE_FILE_NAME, 0); if (file_desc < 0) { printf("Can't open device file: %s\n", DEVICE_FILE_NAME); exit(-1); } ioctl_get_nth_byte(file_desc); ioctl_get_msg(file_desc); ioctl_set_msg(file_desc, msg); close(file_desc); }
/* main() //*/ int main(void) { int fd=0, ret=0; char* msg = "message passed by ioctl\n"; fd = open(DEVICE_FILE_NAME, 0); if(0 > fd) { printf("can't open device file: %s\n", DEVICE_FILE_NAME); exit(EXIT_FAILURE); } ioctl_get_nth_byte(fd); ioctl_get_msg(fd); ioctl_set_msg(fd, msg); close(fd); }
int main() { int fd, status; printf("opening device %s\n", DEVICE_FILE_NAME); while (1) { fd = open(DEVICE_FILE_NAME, O_RDWR); if (fd < 0) { perror("file open faild"); exit(1); } ioctl_get_msg(fd); close(fd); } }
/* * Main - Call the ioctl functions */ int main(int argc, char *argv[]) { int file_desc; char buf[1024]; struct timeval tv; file_desc = open(DEVICE_FILE_NAME, 0); if (file_desc < 0) { printf("Can't open device file: %s\n", DEVICE_FILE_NAME); exit(-1); } gettimeofday(&tv, NULL); snprintf(buf, 1024, "%ld.%06ld:Message passed by ioctl\n", tv.tv_sec, tv.tv_usec); ioctl_get_nth_byte(file_desc); ioctl_get_msg(file_desc); ioctl_set_msg(file_desc, buf); close(file_desc); return 0; }
int main(int argc,char **argv) { char msg[80]; int fd=-1; if(argc!=2) { printf("Usage <dev file name>\n"); return -1; } fd=open(argv[1],O_RDONLY|O_WRONLY); if(fd < 0) { printf("Unable to open the device file\n"); return -2; } printf("calling ioctl_get_msg function\n"); ioctl_get_msg(fd); printf("calling ioctl_set_msg function\n"); strcpy(msg,"Hello world\n"); ioctl_set_msg(fd,msg); printf("calling ioctl_get_nth_byte functio\n"); ioctl_get_nth_byte(fd); close(fd); }