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examples/iscsi-dd: print basic usage information

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Add additional -h/--help parameters.

Signed-off-by: David Disseldorp <ddiss@suse.de>
This commit is contained in:
David Disseldorp
2020-02-21 11:54:26 +01:00
parent e6bcdf5fdb
commit 53471e6215
1 changed files with 29 additions and 8 deletions
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37
examples/iscsi-dd.c
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@@ -523,6 +523,23 @@ void readcap(struct iscsi_context *iscsi, int lun, int use_16,
return; return;
} }
static void usage_exit(int status)
{
fprintf(stderr, "Usage:\n"
"-s, --src <URL> source iSCSI URL (required)\n"
"-d, --dst <URL> destination iSCSI URL (required)\n"
"-i, --initiator-name <IQN> iSCSI initiator name (default=%s)\n"
"-p, --progress show progress while copying\n"
"-6, --16 use READ16 & WRITE16 SCSI commands\n"
"-x, --xcopy offload I/O to the target via XCOPY\n"
"-m, --max <NUM> maximum requests in flight (default=%u)\n"
"-b, --blocks <NUM> blocks per I/O (default=%u)\n"
"-n, --ignore-errors ignore any I/O errors\n"
"-h, --help show this usage message\n",
initiator, max_in_flight, blocks_per_io);
exit(status);
}
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
char *src_url = NULL; char *src_url = NULL;
@@ -542,13 +559,14 @@ int main(int argc, char *argv[])
{"max", required_argument, NULL, 'm'}, {"max", required_argument, NULL, 'm'},
{"blocks", required_argument, NULL, 'b'}, {"blocks", required_argument, NULL, 'b'},
{"ignore-errors", no_argument, NULL, 'n'}, {"ignore-errors", no_argument, NULL, 'n'},
{"help", no_argument, NULL, 'h'},
{0, 0, 0, 0} {0, 0, 0, 0}
}; };
int option_index; int option_index;
memset(&client, 0, sizeof(client)); memset(&client, 0, sizeof(client));
while ((c = getopt_long(argc, argv, "d:s:i:m:b:p6nx", long_options, while ((c = getopt_long(argc, argv, "d:s:i:m:b:p6nxh", long_options,
&option_index)) != -1) { &option_index)) != -1) {
char *endptr; char *endptr;
@@ -590,21 +608,24 @@ int main(int argc, char *argv[])
case 'n': case 'n':
client.ignore_errors = 1; client.ignore_errors = 1;
break; break;
case 'h':
usage_exit(0);
break;
default: default:
fprintf(stderr, "Unrecognized option '%c'\n\n", c); fprintf(stderr, "Unrecognized option '%c'\n\n", c);
exit(1); usage_exit(1);
} }
} }
if (src_url == NULL) { if (src_url == NULL) {
fprintf(stderr, "You must specify source url\n"); fprintf(stderr, "You must specify source url\n"
fprintf(stderr, " --src iscsi://<host>[:<port>]/<target-iqn>/<lun>\n"); " --src iscsi://<host>[:<port>]/<target-iqn>/<lun>\n");
exit(10); usage_exit(10);
} }
if (dst_url == NULL) { if (dst_url == NULL) {
fprintf(stderr, "You must specify destination url\n"); fprintf(stderr, "You must specify destination url\n"
fprintf(stderr, " --dst iscsi://<host>[:<port>]/<target-iqn>/<lun>\n"); " --dst iscsi://<host>[:<port>]/<target-iqn>/<lun>\n");
exit(10); usage_exit(10);
} }
client.src_iscsi = iscsi_create_context(initiator); client.src_iscsi = iscsi_create_context(initiator);