tree-wide: voidify pager_open()

Even if pager_open() fails, in general, we should continue the operations.
All erroneous cases in pager_open() show log message in the function.
So, it is not necessary to check the returned value.

15 files changed, 57 insertions, 59 deletions

diff --git a/src/analyze/analyze.c b/src/analyze/analyze.c
index 092ff763ba..1bed16e219 100644
--- a/src/analyze/analyze.c
+++ b/src/analyze/analyze.c
@@ -1027,7 +1027,7 @@ static int analyze_critical_chain(int argc, char *argv[], void *userdata) {
         }
         unit_times_hashmap = h;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         puts("The time after the unit is active or started is printed after the \"@\" character.\n"
              "The time the unit takes to start is printed after the \"+\" character.\n");
@@ -1060,7 +1060,7 @@ static int analyze_blame(int argc, char *argv[], void *userdata) {
 
         qsort(times, n, sizeof(struct unit_times), compare_unit_time);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         for (i = 0; i < (unsigned) n; i++) {
                 char ts[FORMAT_TIMESPAN_MAX];
@@ -1283,7 +1283,7 @@ static int dump(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to create bus connection: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -1445,7 +1445,7 @@ static void dump_syscall_filter(const SyscallFilterSet *set) {
 static int dump_syscall_filters(int argc, char *argv[], void *userdata) {
         bool first = true;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (strv_isempty(strv_skip(argv, 1))) {
                 int i;
@@ -1607,7 +1607,7 @@ static int do_verify(int argc, char *argv[], void *userdata) {
 
 static int help(int argc, char *argv[], void *userdata) {
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
                "Profile systemd, show unit dependencies, check unit files.\n\n"
diff --git a/src/busctl/busctl.c b/src/busctl/busctl.c
index ae4c8c26c0..2f9250e2ae 100644
--- a/src/busctl/busctl.c
+++ b/src/busctl/busctl.c
@@ -167,7 +167,7 @@ static int list_bus_names(int argc, char **argv, void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to list names: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         names = hashmap_new(&string_hash_ops);
         if (!names)
@@ -482,7 +482,7 @@ static int tree_one(sd_bus *bus, const char *service, const char *prefix, bool m
                 p = NULL;
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         l = set_get_strv(done);
         if (!l)
@@ -516,7 +516,7 @@ static int tree(int argc, char **argv, void *userdata) {
                 if (r < 0)
                         return log_error_errno(r, "Failed to get name list: %m");
 
-                pager_open(arg_no_pager, false);
+                (void) pager_open(arg_no_pager, false);
 
                 STRV_FOREACH(i, names) {
                         int q;
@@ -546,7 +546,7 @@ static int tree(int argc, char **argv, void *userdata) {
                                 printf("\n");
 
                         if (argv[2]) {
-                                pager_open(arg_no_pager, false);
+                                (void) pager_open(arg_no_pager, false);
                                 printf("Service %s%s%s:\n", ansi_highlight(), *i, ansi_normal());
                         }
 
@@ -1052,7 +1052,7 @@ static int introspect(int argc, char **argv, void *userdata) {
                         return bus_log_parse_error(r);
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         name_width = STRLEN("NAME");
         type_width = STRLEN("TYPE");
@@ -1662,7 +1662,7 @@ static int call(int argc, char **argv, void *userdata) {
         if (r == 0 && !arg_quiet) {
 
                 if (arg_verbose) {
-                        pager_open(arg_no_pager, false);
+                        (void) pager_open(arg_no_pager, false);
 
                         r = bus_message_dump(reply, stdout, 0);
                         if (r < 0)
@@ -1713,7 +1713,7 @@ static int get_property(int argc, char **argv, void *userdata) {
                         return bus_log_parse_error(r);
 
                 if (arg_verbose)  {
-                        pager_open(arg_no_pager, false);
+                        (void) pager_open(arg_no_pager, false);
 
                         r = bus_message_dump(reply, stdout, BUS_MESSAGE_DUMP_SUBTREE_ONLY);
                         if (r < 0)
diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index bd8c6a0059..1e92dabe0c 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -176,11 +176,9 @@ int main(int argc, char *argv[]) {
         if (r <= 0)
                 goto finish;
 
-        if (!arg_no_pager) {
-                r = pager_open(arg_no_pager, false);
-                if (r > 0 && arg_full < 0)
-                        arg_full = true;
-        }
+        r = pager_open(arg_no_pager, false);
+        if (r > 0 && arg_full < 0)
+                arg_full = true;
 
         output_flags =
                 arg_all * OUTPUT_SHOW_ALL |
diff --git a/src/core/main.c b/src/core/main.c
index 4b2d149237..a4d2cdf759 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -2326,7 +2326,7 @@ int main(int argc, char *argv[]) {
                 goto finish;
 
         if (IN_SET(arg_action, ACTION_TEST, ACTION_HELP, ACTION_DUMP_CONFIGURATION_ITEMS))
-                pager_open(arg_no_pager, false);
+                (void) pager_open(arg_no_pager, false);
 
         if (arg_action != ACTION_RUN)
                 skip_setup = true;
diff --git a/src/coredump/coredumpctl.c b/src/coredump/coredumpctl.c
index 2795f5b675..2f8b9b7cbf 100644
--- a/src/coredump/coredumpctl.c
+++ b/src/coredump/coredumpctl.c
@@ -658,7 +658,7 @@ static int dump_list(int argc, char **argv, void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         /* The coredumps are likely to compressed, and for just
          * listing them we don't need to decompress them, so let's
diff --git a/src/delta/delta.c b/src/delta/delta.c
index 4fe89ff9b0..49d9f0bb03 100644
--- a/src/delta/delta.c
+++ b/src/delta/delta.c
@@ -662,7 +662,7 @@ int main(int argc, char *argv[]) {
         else if (arg_diff)
                 arg_flags |= SHOW_OVERRIDDEN;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (optind < argc) {
                 int i;
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index e0ad0e1d11..3c9c6df07d 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -316,7 +316,7 @@ static int parse_boot_descriptor(const char *x, sd_id128_t *boot_id, int *offset
 
 static void help(void) {
 
-        pager_open(arg_no_pager, arg_pager_end);
+        (void) pager_open(arg_no_pager, arg_pager_end);
 
         printf("%s [OPTIONS...] [MATCHES...]\n\n"
                "Query the journal.\n\n"
@@ -1369,7 +1369,7 @@ static int list_boots(sd_journal *j) {
         if (count == 0)
                 return count;
 
-        pager_open(arg_no_pager, arg_pager_end);
+        (void) pager_open(arg_no_pager, arg_pager_end);
 
         /* numbers are one less, but we need an extra char for the sign */
         w = DECIMAL_STR_WIDTH(count - 1) + 1;
@@ -2135,7 +2135,7 @@ int main(int argc, char *argv[]) {
                 } else {
                         bool oneline = arg_action == ACTION_LIST_CATALOG;
 
-                        pager_open(arg_no_pager, arg_pager_end);
+                        (void) pager_open(arg_no_pager, arg_pager_end);
 
                         if (optind < argc)
                                 r = catalog_list_items(stdout, database, oneline, argv + optind);
@@ -2492,7 +2492,7 @@ int main(int argc, char *argv[]) {
                 need_seek = true;
 
         if (!arg_follow)
-                pager_open(arg_no_pager, arg_pager_end);
+                (void) pager_open(arg_no_pager, arg_pager_end);
 
         if (!arg_quiet && (arg_lines != 0 || arg_follow)) {
                 usec_t start, end;
diff --git a/src/locale/localectl.c b/src/locale/localectl.c
index e67ba4e7e0..f50d31a29b 100644
--- a/src/locale/localectl.c
+++ b/src/locale/localectl.c
@@ -223,7 +223,7 @@ static int list_locales(int argc, char **argv, void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to read list of locales: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
         strv_print(l);
 
         return 0;
@@ -265,7 +265,7 @@ static int list_vconsole_keymaps(int argc, char **argv, void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to read list of keymaps: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         strv_print(l);
 
@@ -391,7 +391,7 @@ static int list_x11_keymaps(int argc, char **argv, void *userdata) {
         strv_sort(list);
         strv_uniq(list);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         strv_print(list);
         return 0;
diff --git a/src/login/loginctl.c b/src/login/loginctl.c
index c811ee6c5e..2f53a2740d 100644
--- a/src/login/loginctl.c
+++ b/src/login/loginctl.c
@@ -111,7 +111,7 @@ static int list_sessions(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -186,7 +186,7 @@ static int list_users(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -231,7 +231,7 @@ static int list_seats(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -903,7 +903,7 @@ static int show_session(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 const char *session, *p = "/org/freedesktop/login1/session/self";
@@ -955,7 +955,7 @@ static int show_user(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 /* If not argument is specified inspect the manager
@@ -1015,7 +1015,7 @@ static int show_seat(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 /* If not argument is specified inspect the manager
diff --git a/src/machine/machinectl.c b/src/machine/machinectl.c
index e695bdbab4..9180ec4725 100644
--- a/src/machine/machinectl.c
+++ b/src/machine/machinectl.c
@@ -207,7 +207,7 @@ static int list_machines(int argc, char *argv[], void *userdata) {
 
         assert(bus);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(bus,
                                "org.freedesktop.machine1",
@@ -363,7 +363,7 @@ static int list_images(int argc, char *argv[], void *userdata) {
 
         assert(bus);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(bus,
                                "org.freedesktop.machine1",
@@ -860,7 +860,7 @@ static int show_machine(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (properties && argc <= 1) {
 
@@ -1213,7 +1213,7 @@ static int show_image(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
 
@@ -2543,7 +2543,7 @@ static int list_transfers(int argc, char *argv[], void *userdata) {
         double progress;
         int r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(bus,
                                "org.freedesktop.import1",
@@ -2758,7 +2758,7 @@ static int clean_images(int argc, char *argv[], void *userdata) {
 }
 
 static int help(int argc, char *argv[], void *userdata) {
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
                "Send control commands to or query the virtual machine and container\n"
diff --git a/src/mount/mount-tool.c b/src/mount/mount-tool.c
index 0cd9f07094..dd139740c2 100644
--- a/src/mount/mount-tool.c
+++ b/src/mount/mount-tool.c
@@ -1529,7 +1529,7 @@ static int list_devices(void) {
 
         qsort_safe(items, n, sizeof(struct item), compare_item);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         fputs(ansi_underline(), stdout);
         for (c = 0; c < _COLUMN_MAX; c++) {
diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index 50317e948d..362f671417 100644
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -273,7 +273,7 @@ static int list_links(int argc, char *argv[], void *userdata) {
         if (c < 0)
                 return c;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (arg_legend)
                 printf("%3s %-16s %-18s %-11s %-10s\n",
@@ -897,7 +897,7 @@ static int link_status(int argc, char *argv[], void *userdata) {
         _cleanup_free_ LinkInfo *links = NULL;
         int r, c, i;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_netlink_open(&rtnl);
         if (r < 0)
@@ -993,7 +993,7 @@ static int link_lldp_status(int argc, char *argv[], void *userdata) {
         if (c < 0)
                 return c;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (arg_legend)
                 printf("%-16s %-17s %-16s %-11s %-17s %-16s\n",
diff --git a/src/resolve/resolve-tool.c b/src/resolve/resolve-tool.c
index 04f883654a..d1395b2e2c 100644
--- a/src/resolve/resolve-tool.c
+++ b/src/resolve/resolve-tool.c
@@ -1241,7 +1241,7 @@ static int status_ifindex(sd_bus *bus, int ifindex, const char *name, bool *empt
                 goto finish;
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (*empty_line)
                 fputc('\n', stdout);
@@ -1450,7 +1450,7 @@ static int status_global(sd_bus *bus, bool *empty_line) {
                 goto finish;
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         printf("%sGlobal%s\n", ansi_highlight(), ansi_normal());
         STRV_FOREACH(i, global_info.dns) {
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 0f383ec9e0..7bd5ecbb40 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -791,7 +791,7 @@ static int list_units(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = get_unit_list_recursive(bus, strv_skip(argv, 1), &unit_infos, &replies, &machines);
         if (r < 0)
@@ -1003,7 +1003,7 @@ static int list_sockets(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         n = get_unit_list_recursive(bus, strv_skip(argv, 1), &unit_infos, &replies, &machines);
         if (n < 0)
@@ -1310,7 +1310,7 @@ static int list_timers(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         n = get_unit_list_recursive(bus, strv_skip(argv, 1), &unit_infos, &replies, &machines);
         if (n < 0)
@@ -1599,7 +1599,7 @@ static int list_unit_files(int argc, char *argv[], void *userdata) {
                         return bus_log_parse_error(r);
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         qsort_safe(units, c, sizeof(UnitFileList), compare_unit_file_list);
         output_unit_file_list(units, c);
@@ -1854,7 +1854,7 @@ static int list_dependencies(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         puts(u);
 
@@ -2086,7 +2086,7 @@ static int list_machines(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         qsort_safe(machine_infos, r, sizeof(struct machine_info), compare_machine_info);
         output_machines_list(machine_infos, r);
@@ -2258,7 +2258,7 @@ static void output_jobs_list(sd_bus *bus, const struct job_info* jobs, unsigned
                 return;
         }
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         id_len = STRLEN("JOB");
         unit_len = STRLEN("UNIT");
@@ -2373,7 +2373,7 @@ static int list_jobs(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return bus_log_parse_error(r);
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         output_jobs_list(bus, jobs, c, skipped);
         return 0;
@@ -5325,7 +5325,7 @@ static int show_all(
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         c = (unsigned) r;
 
@@ -5427,7 +5427,7 @@ static int show(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         if (show_status)
                 /* Increase max number of open files to 16K if we can, we
@@ -5555,7 +5555,7 @@ static int cat(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to expand names: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         STRV_FOREACH(name, names) {
                 _cleanup_free_ char *fragment_path = NULL;
@@ -5834,7 +5834,7 @@ static int show_environment(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return r;
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         r = sd_bus_get_property(
                         bus,
@@ -7220,7 +7220,7 @@ end:
 
 static void systemctl_help(void) {
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
 
         printf("%s [OPTIONS...] {COMMAND} ...\n\n"
                "Query or send control commands to the systemd manager.\n\n"
diff --git a/src/timedate/timedatectl.c b/src/timedate/timedatectl.c
index cd1e00a196..d390e24e62 100644
--- a/src/timedate/timedatectl.c
+++ b/src/timedate/timedatectl.c
@@ -283,7 +283,7 @@ static int list_timezones(int argc, char **argv, void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to read list of time zones: %m");
 
-        pager_open(arg_no_pager, false);
+        (void) pager_open(arg_no_pager, false);
         strv_print(zones);
 
         return 0;