use #pragma once instead of foo*foo #define guards

#pragma once has been "un-deprecated" in gcc since 3.3, and is widely supported
in other compilers.

I've been using and maintaining (rebasing) this patch for a while now, as
it annoyed me to see #ifndef fooblahfoo, etc all over the place,
almost arrogant about the annoyance of having to define all these names to
perform a commen but neccicary functionality, when a completely superior
alternative exists.

I havn't sent it till now, cause its kindof a style change, and it is bad
voodoo to mess with style that has been established by more established
editors. So feel free to lambast me as a crazy bafoon.

v2 - preserve externally used headers

src/shared/acl-util.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooaclutilhfoo
-#define fooaclutilhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -23,5 +22,3 @@
 ***/
 
 int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry);
-
-#endif

src/shared/ask-password-api.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooaskpasswordapihfoo
-#define fooaskpasswordapihfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -29,5 +28,3 @@ int ask_password_tty(const char *message, usec_t until, const char *flag_file, c
 int ask_password_agent(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases);
 
 int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases);
-
-#endif

src/shared/cgroup-util.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foocgrouputilhfoo
-#define foocgrouputilhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -73,5 +72,3 @@ int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup);
 int cg_pid_get_unit(pid_t pid, char **unit);
 
 char **cg_shorten_controllers(char **controllers);
-
-#endif

src/shared/conf-parser.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooconfparserhfoo
-#define fooconfparserhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -134,5 +133,3 @@ int config_parse_level(const char *filename, unsigned line, const char *section,
                                                                         \
                 return 0;                                               \
         }
-
-#endif

src/shared/dbus-common.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foodbuscommonhfoo
-#define foodbuscommonhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -204,5 +203,3 @@ void bus_async_unregister_and_exit(DBusConnection *bus, const char *name);
 DBusHandlerResult bus_exit_idle_filter(DBusConnection *bus, DBusMessage *m, void *userdata);
 
 pid_t bus_get_unix_process_id(DBusConnection *connection, const char *name, DBusError *error);
-
-#endif

src/shared/dbus-loop.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foodbusloophfoo
-#define foodbusloophfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -26,5 +25,3 @@
 
 int bus_loop_open(DBusConnection *c);
 int bus_loop_dispatch(int fd);
-
-#endif

src/shared/def.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foodefhfoo
-#define foodefhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -34,5 +33,3 @@
 
 #define SIGNALS_CRASH_HANDLER SIGSEGV,SIGILL,SIGFPE,SIGBUS,SIGQUIT,SIGABRT
 #define SIGNALS_IGNORE SIGKILL,SIGPIPE
-
-#endif

src/shared/exit-status.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooexitstatushfoo
-#define fooexitstatushfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -82,5 +81,3 @@ const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level);
 
 bool is_clean_exit(int code, int status);
 bool is_clean_exit_lsb(int code, int status);
-
-#endif

src/shared/hashmap.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foohashmaphfoo
-#define foohashmaphfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -89,5 +88,3 @@ char **hashmap_get_strv(Hashmap *h);
 
 #define HASHMAP_FOREACH_BACKWARDS(e, h, i) \
         for ((i) = ITERATOR_LAST, (e) = hashmap_iterate_backwards((h), &(i), NULL); (e); (e) = hashmap_iterate_backwards((h), &(i), NULL))
-
-#endif

src/shared/install.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooinstallhfoo
-#define fooinstallhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -85,5 +84,3 @@ UnitFileState unit_file_state_from_string(const char *s);
 
 const char *unit_file_change_type_to_string(UnitFileChangeType s);
 UnitFileChangeType unit_file_change_type_from_string(const char *s);
-
-#endif

src/shared/label.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foolabelhfoo
-#define foolabelhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -46,5 +45,3 @@ int label_mkdir(const char *path, mode_t mode, bool apply);
 void label_retest_selinux(void);
 
 int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen);
-
-#endif

src/shared/list.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foolisthfoo
-#define foolisthfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -124,5 +123,3 @@
 
 #define LIST_FOREACH_AFTER(name,i,p)                                    \
         for ((i) = (p)->name##_next; (i); (i) = (i)->name##_next)
-
-#endif

src/shared/log.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foologhfoo
-#define foologhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -108,5 +107,3 @@ int log_dump_internal(
 
 const char *log_target_to_string(LogTarget target);
 LogTarget log_target_from_string(const char *s);
-
-#endif

src/shared/logs-show.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foologsshowhfoo
-#define foologsshowhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -60,5 +59,3 @@ int show_journal_by_unit(
 
 const char* output_mode_to_string(OutputMode m);
 OutputMode output_mode_from_string(const char *s);
-
-#endif

src/shared/macro.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foomacrohfoo
-#define foomacrohfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -189,5 +188,3 @@ static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
 }
 
 #include "log.h"
-
-#endif

src/shared/missing.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foomissinghfoo
-#define foomissinghfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -191,5 +190,3 @@ static inline pid_t gettid(void) {
 #ifndef PR_SET_NO_NEW_PRIVS
 #define PR_SET_NO_NEW_PRIVS 38
 #endif
-
-#endif

src/shared/pager.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foopagerhfoo
-#define foopagerhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -24,5 +23,3 @@
 
 void pager_open(void);
 void pager_close(void);
-
-#endif

src/shared/path-lookup.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foopathlookuphfoo
-#define foopathlookuphfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -36,5 +35,3 @@ int user_config_home(char **config_home);
 
 int lookup_paths_init(LookupPaths *p, ManagerRunningAs running_as, bool personal, const char *generator, const char *generator_early, const char *generator_late);
 void lookup_paths_free(LookupPaths *p);
-
-#endif

src/shared/polkit.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foopolkithfoo
-#define foopolkithfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -32,5 +31,3 @@ int verify_polkit(
                 bool interactive,
                 bool *challenge,
                 DBusError *error);
-
-#endif

src/shared/ratelimit.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooratelimithfoo
-#define fooratelimithfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -56,5 +55,3 @@ typedef struct RateLimit {
         } while (false)
 
 bool ratelimit_test(RateLimit *r);
-
-#endif

src/shared/set.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foosethfoo
-#define foosethfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -67,5 +66,3 @@ void* set_last(Set *s);
 
 #define SET_FOREACH_BACKWARDS(e, s, i) \
         for ((i) = ITERATOR_LAST, (e) = set_iterate_backwards((s), &(i)); (e); (e) = set_iterate_backwards((s), &(i)))
-
-#endif

src/shared/socket-util.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foosocketutilhfoo
-#define foosocketutilhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -98,5 +97,3 @@ const char* netlink_family_to_string(int b);
 int netlink_family_from_string(const char *s);
 
 bool socket_ipv6_is_supported(void);
-
-#endif

src/shared/spawn-ask-password-agent.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foospawnaskpasswordagenthfoo
-#define foospawnaskpasswordagenthfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -24,5 +23,3 @@
 
 int ask_password_agent_open(void);
 void ask_password_agent_close(void);
-
-#endif

src/shared/specifier.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foospecifierhfoo
-#define foospecifierhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -33,5 +32,3 @@ typedef struct Specifier {
 char *specifier_printf(const char *text, const Specifier table[], void *userdata);
 
 char* specifier_string(char specifier, void *data, void *userdata);
-
-#endif

src/shared/strv.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foostrvhfoo
-#define foostrvhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -80,5 +79,3 @@ bool strv_overlap(char **a, char **b);
 
 #define STRV_FOREACH_BACKWARDS(s, l)            \
         for (; (l) && ((s) >= (l)); (s)--)
-
-#endif

src/shared/unit-name.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foounitnamehfoo
-#define foounitnamehfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -92,5 +91,3 @@ char *unit_name_to_path(const char *name);
 char *unit_dbus_path_from_name(const char *name);
 
 char *unit_name_mangle(const char *name);
-
-#endif

src/shared/utf8.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooutf8hfoo
-#define fooutf8hfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -31,5 +30,3 @@ char *utf8_is_printable_n(const char* str, size_t length) _pure_;
 
 char *utf8_filter(const char *s);
 char *ascii_filter(const char *s);
-
-#endif

src/shared/util.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooutilhfoo
-#define fooutilhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -531,5 +530,3 @@ void warn_melody(void);
 
 int get_shell(char **ret);
 int get_home_dir(char **ret);
-
-#endif

src/shared/utmp-wtmp.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef fooutmpwtmphfoo
-#define fooutmpwtmphfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -34,5 +33,3 @@ int utmp_put_dead_process(const char *id, pid_t pid, int code, int status);
 int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line);
 
 int utmp_wall(const char *message, bool (*match_tty)(const char *tty));
-
-#endif

src/shared/virt.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foovirthfoo
-#define foovirthfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -34,5 +33,3 @@ typedef enum Virtualization {
 } Virtualization;
 
 Virtualization detect_virtualization(const char **id);
-
-#endif

src/shared/watchdog.h

@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foowatchdoghfoo
-#define foowatchdoghfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -27,5 +26,3 @@
 int watchdog_set_timeout(usec_t *usec);
 int watchdog_ping(void);
 void watchdog_close(bool disarm);
-
-#endif