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qemu-nbd: Improve error reporting 

- use err(3) instead of errx(3) if errno is available
  to report why failed
- let fail prior to daemon(3) if opening a nbd file
  is likely to fail after daemonizing to avoid silent
  failure exit
- add missing 'ret = 1' when unix_socket_outgoing failed

Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Ryota Ozaki 2010-05-03 06:50:25 +09:00 committed by Kevin Wolf
parent 3abbc4d981
commit cb7cf0e3f4
1 changed files with 24 additions and 10 deletions
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34
qemu-nbd.c
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@ -112,9 +112,12 @@ static int find_partition(BlockDriverState *bs, int partition,
uint8_t data[512];
int i;
int ext_partnum = 4;
int ret;
if (bdrv_read(bs, 0, data, 1))
errx(EXIT_FAILURE, "error while reading");
if ((ret = bdrv_read(bs, 0, data, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
if (data[510] != 0x55 || data[511] != 0xaa) {
errno = -EINVAL;
@ -132,8 +135,10 @@ static int find_partition(BlockDriverState *bs, int partition,
uint8_t data1[512];
int j;
if (bdrv_read(bs, mbr[i].start_sector_abs, data1, 1))
errx(EXIT_FAILURE, "error while reading");
if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
for (j = 0; j < 4; j++) {
read_partition(&data1[446 + 16 * j], &ext[j]);
@ -316,7 +321,7 @@ int main(int argc, char **argv)
if (disconnect) {
fd = open(argv[optind], O_RDWR);
if (fd == -1)
errx(EXIT_FAILURE, "Cannot open %s", argv[optind]);
err(EXIT_FAILURE, "Cannot open %s", argv[optind]);
nbd_disconnect(fd);
@ -333,23 +338,30 @@ int main(int argc, char **argv)
if (bs == NULL)
return 1;
if (bdrv_open(bs, argv[optind], flags, NULL) < 0)
return 1;
if ((ret = bdrv_open(bs, argv[optind], flags, NULL)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]);
}
fd_size = bs->total_sectors * 512;
if (partition != -1 &&
find_partition(bs, partition, &dev_offset, &fd_size))
errx(EXIT_FAILURE, "Could not find partition %d", partition);
err(EXIT_FAILURE, "Could not find partition %d", partition);
if (device) {
pid_t pid;
int sock;
/* want to fail before daemonizing */
if (access(device, R_OK|W_OK) == -1) {
err(EXIT_FAILURE, "Could not access '%s'", device);
}
if (!verbose) {
/* detach client and server */
if (daemon(0, 0) == -1) {
errx(EXIT_FAILURE, "Failed to daemonize");
err(EXIT_FAILURE, "Failed to daemonize");
}
}
@ -372,8 +384,10 @@ int main(int argc, char **argv)
do {
sock = unix_socket_outgoing(socket);
if (sock == -1) {
if (errno != ENOENT && errno != ECONNREFUSED)
if (errno != ENOENT && errno != ECONNREFUSED) {
ret = 1;
goto out;
}
sleep(1); /* wait children */
}
} while (sock == -1);