// read the IVT from eMMC
int read_block(char *ivt){
int ret = 0;
int d = open(MMC_DEVICE, O_RDONLY);
if(d == -1) {
return -1;
}
if((skip_blocks(d, ivt, 1, BLOCK_SIZE) != 0) || (safe_read(d, ivt, BLOCK_SIZE) != (int)BLOCK_SIZE)){
ret = -1;
}
close(d);
return ret;
}
// write the IVT to eMMC
int write_block(char *ivt){
int ret = 0;
int d = open(MMC_DEVICE, O_WRONLY|O_DIRECT|O_SYNC);
if(d == -1) {
return -1;
}
if((skip_blocks(d, ivt, 1, BLOCK_SIZE) != 0) || (write(d, ivt, BLOCK_SIZE) != (int)BLOCK_SIZE)){
ret = -1;
}
close(d);
return ret;
}
int main(int argc, char *argv[])
{
struct stats stats;
int ret;
int rd_fd = 0, wr_fd = 1;
progname = argv[0];
ret = parse_options(argc, argv);
if (ret)
return ret;
if (conv & (CONV_BLOCK | CONV_UNBLOCK)) {
fprintf(stderr, "%s: block/unblock not implemented\n",
progname);
return 1;
}
in_buf = malloc(ibs);
if (!in_buf) {
perror("malloc ibs");
return 1;
}
out_buf = malloc(obs);
if (!out_buf) {
perror("malloc obs");
return 1;
}
/*
* Open the input file, if specified.
*/
if (OPT_IF->str) {
rd_fd = open(OPT_IF->str, O_RDONLY);
if (rd_fd == -1) {
perror("open input file");
return 1;
}
}
/*
* Open the output file, if specified.
*/
if (OPT_OF->str) {
int flags = O_WRONLY|O_CREAT;
flags |= (conv & CONV_NOTRUNC) ? 0 : O_TRUNC;
wr_fd = open(OPT_OF->str, flags, 0666);
if (wr_fd == -1) {
perror("open output file");
close(rd_fd);
return 1;
}
}
/*
* Skip obs-sized blocks of output file.
*/
if (OPT_SEEK->str && skip_blocks(wr_fd, out_buf, seek, obs)) {
close(rd_fd);
close(wr_fd);
return 1;
}
/*
* Skip ibs-sized blocks of input file.
*/
if (OPT_SKIP->str && skip_blocks(rd_fd, in_buf, skip, ibs)) {
close(rd_fd);
close(wr_fd);
return 1;
}
memset(&stats, 0, sizeof(stats));
/*
* Do the real work
*/
ret = dd(rd_fd, wr_fd, &stats);
if (close(rd_fd) == -1)
perror(OPT_IF->str ? OPT_IF->str : "stdin");
if (close(wr_fd) == -1)
perror(OPT_OF->str ? OPT_OF->str : "stdout");
fprintf(stderr, "%u+%u records in\n", stats.in_full, stats.in_partial);
fprintf(stderr, "%u+%u records out\n",
stats.out_full, stats.out_partial);
if (stats.truncated)
fprintf(stderr, "%u truncated record%s\n",
stats.truncated, stats.truncated == 1 ? "" : "s");
/*
* ret will be -SIGINT if we got a SIGINT. Raise
* the signal again to cause us to terminate with
* SIGINT status.
*/
if (ret == -SIGINT)
raise(SIGINT);
return ret;
}