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authorMarkus Armbruster <armbru@redhat.com>2016-03-15 19:34:17 +0100
committerMarkus Armbruster <armbru@redhat.com>2016-03-18 17:34:40 +0100
commite3ad72965a86b19df5d011117e186c62893085ef (patch)
tree639078c0b57df584ae1877f0923e73d7d70c042a /contrib
parent3be5cc23245637577210e43e68dd3babd01fbb5e (diff)
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ivshmem-server: Fix and clean up command line help
Burying error messages in ~20 lines of usage help is bad form. Print a single line pointing to -h instead. Print -h help to stdout rather than stderr. Fix default of -p. Clean up the help text a bit. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1458066895-20632-3-git-send-email-armbru@redhat.com>
Diffstat (limited to 'contrib')
-rw-r--r--contrib/ivshmem-server/main.c86
1 files changed, 42 insertions, 44 deletions
diff --git a/contrib/ivshmem-server/main.c b/contrib/ivshmem-server/main.c
index cca1061..3332a8c 100644
--- a/contrib/ivshmem-server/main.c
+++ b/contrib/ivshmem-server/main.c
@@ -33,31 +33,32 @@ typedef struct IvshmemServerArgs {
unsigned n_vectors;
} IvshmemServerArgs;
-/* show ivshmem_server_usage and exit with given error code */
static void
-ivshmem_server_usage(const char *name, int code)
+ivshmem_server_usage(const char *progname)
{
- fprintf(stderr, "%s [opts]\n", name);
- fprintf(stderr, " -h: show this help\n");
- fprintf(stderr, " -v: verbose mode\n");
- fprintf(stderr, " -F: foreground mode (default is to daemonize)\n");
- fprintf(stderr, " -p <pid_file>: path to the PID file (used in daemon\n"
- " mode only).\n"
- " Default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH);
- fprintf(stderr, " -S <unix_socket_path>: path to the unix socket\n"
- " to listen to.\n"
- " Default=%s\n", IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH);
- fprintf(stderr, " -m <shm_path>: path to the shared memory.\n"
- " The path corresponds to a POSIX shm name or a\n"
- " hugetlbfs mount point.\n"
- " default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH);
- fprintf(stderr, " -l <size>: size of shared memory in bytes. The suffix\n"
- " K, M and G can be used (ex: 1K means 1024).\n"
- " default=%u\n", IVSHMEM_SERVER_DEFAULT_SHM_SIZE);
- fprintf(stderr, " -n <n_vects>: number of vectors.\n"
- " default=%u\n", IVSHMEM_SERVER_DEFAULT_N_VECTORS);
-
- exit(code);
+ printf("Usage: %s [OPTION]...\n"
+ " -h: show this help\n"
+ " -v: verbose mode\n"
+ " -F: foreground mode (default is to daemonize)\n"
+ " -p <pid-file>: path to the PID file (used in daemon mode only)\n"
+ " default " IVSHMEM_SERVER_DEFAULT_PID_FILE "\n"
+ " -S <unix-socket-path>: path to the unix socket to listen to\n"
+ " default " IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "\n"
+ " -m <shm-path>: POSIX shared memory object name or a hugetlbfs mount point\n"
+ " default " IVSHMEM_SERVER_DEFAULT_SHM_PATH "\n"
+ " -l <size>: size of shared memory in bytes\n"
+ " suffixes K, M and G can be used, e.g. 1K means 1024\n"
+ " default %u\n"
+ " -n <nvectors>: number of vectors\n"
+ " default %u\n",
+ progname, IVSHMEM_SERVER_DEFAULT_SHM_SIZE,
+ IVSHMEM_SERVER_DEFAULT_N_VECTORS);
+}
+
+static void
+ivshmem_server_help(const char *progname)
+{
+ fprintf(stderr, "Try '%s -h' for more information.\n", progname);
}
/* parse the program arguments, exit on error */
@@ -68,20 +69,12 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
unsigned long long v;
Error *err = NULL;
- while ((c = getopt(argc, argv,
- "h" /* help */
- "v" /* verbose */
- "F" /* foreground */
- "p:" /* pid_file */
- "S:" /* unix_socket_path */
- "m:" /* shm_path */
- "l:" /* shm_size */
- "n:" /* n_vectors */
- )) != -1) {
+ while ((c = getopt(argc, argv, "hvFp:S:m:l:n:")) != -1) {
switch (c) {
case 'h': /* help */
- ivshmem_server_usage(argv[0], 0);
+ ivshmem_server_usage(argv[0]);
+ exit(0);
break;
case 'v': /* verbose */
@@ -92,36 +85,39 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
args->foreground = 1;
break;
- case 'p': /* pid_file */
+ case 'p': /* pid file */
args->pid_file = optarg;
break;
- case 'S': /* unix_socket_path */
+ case 'S': /* unix socket path */
args->unix_socket_path = optarg;
break;
- case 'm': /* shm_path */
+ case 'm': /* shm path */
args->shm_path = optarg;
break;
- case 'l': /* shm_size */
+ case 'l': /* shm size */
parse_option_size("shm_size", optarg, &args->shm_size, &err);
if (err) {
error_report_err(err);
- ivshmem_server_usage(argv[0], 1);
+ ivshmem_server_help(argv[0]);
+ exit(1);
}
break;
- case 'n': /* n_vectors */
+ case 'n': /* number of vectors */
if (parse_uint_full(optarg, &v, 0) < 0) {
fprintf(stderr, "cannot parse n_vectors\n");
- ivshmem_server_usage(argv[0], 1);
+ ivshmem_server_help(argv[0]);
+ exit(1);
}
args->n_vectors = v;
break;
default:
- ivshmem_server_usage(argv[0], 1);
+ ivshmem_server_usage(argv[0]);
+ exit(1);
break;
}
}
@@ -129,12 +125,14 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
if (args->n_vectors > IVSHMEM_SERVER_MAX_VECTORS) {
fprintf(stderr, "too many requested vectors (max is %d)\n",
IVSHMEM_SERVER_MAX_VECTORS);
- ivshmem_server_usage(argv[0], 1);
+ ivshmem_server_help(argv[0]);
+ exit(1);
}
if (args->verbose == 1 && args->foreground == 0) {
fprintf(stderr, "cannot use verbose in daemon mode\n");
- ivshmem_server_usage(argv[0], 1);
+ ivshmem_server_help(argv[0]);
+ exit(1);
}
}