shared: add new btrfs-util.[ch] helpers for doing common btrfs operation

[elogind.git] / src / shared / utmp-wtmp.c

diff --git a/src/shared/utmp-wtmp.c b/src/shared/utmp-wtmp.c
index 32996fad36cd711fcf03a12286742bbd35de05cd..31f13ec808c0c5567ac421b4fb3ada62cf812ede 100644 (file)
--- a/src/shared/utmp-wtmp.c
+++ b/src/shared/utmp-wtmp.c
@@ -92,8 +92,6 @@ int utmp_get_runlevel(int *runlevel, int *previous) {
 static void init_timestamp(struct utmpx *store, usec_t t) {
         assert(store);
 
-        zero(*store);
-
         if (t <= 0)
                 t = now(CLOCK_REALTIME);
 
@@ -143,7 +141,7 @@ static int write_entry_wtmp(const struct utmpx *store) {
         assert(store);
 
         /* wtmp is a simple append-only file where each entry is
-        simply appended to * the end; i.e. basically a log. */
+        simply appended to the end; i.e. basically a log. */
 
         errno = 0;
         updwtmpx(_PATH_WTMPX, store);
@@ -172,7 +170,7 @@ static int write_entry_both(const struct utmpx *store) {
 }
 
 int utmp_put_shutdown(void) {
-        struct utmpx store;
+        struct utmpx store = {};
 
         init_entry(&store, 0);
 
@@ -183,7 +181,7 @@ int utmp_put_shutdown(void) {
 }
 
 int utmp_put_reboot(usec_t t) {
-        struct utmpx store;
+        struct utmpx store = {};
 
         init_entry(&store, t);
 
@@ -206,16 +204,17 @@ _pure_ static const char *sanitize_id(const char *id) {
 }
 
 int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line) {
-        struct utmpx store;
+        struct utmpx store = {
+                .ut_type = INIT_PROCESS,
+                .ut_pid = pid,
+                .ut_session = sid,
+        };
 
         assert(id);
 
         init_timestamp(&store, 0);
 
-        store.ut_type = INIT_PROCESS;
-        store.ut_pid = pid;
-        store.ut_session = sid;
-
+        /* ut_id needs only be nul-terminated if it is shorter than sizeof(ut_id) */
         strncpy(store.ut_id, sanitize_id(id), sizeof(store.ut_id));
 
         if (line)
@@ -225,14 +224,15 @@ int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line
 }
 
 int utmp_put_dead_process(const char *id, pid_t pid, int code, int status) {
-        struct utmpx lookup, store, store_wtmp, *found;
+        struct utmpx lookup = {
+                .ut_type = INIT_PROCESS /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */
+        }, store, store_wtmp, *found;
 
         assert(id);
 
         setutxent();
 
-        zero(lookup);
-        lookup.ut_type = INIT_PROCESS; /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */
+        /* ut_id needs only be nul-terminated if it is shorter than sizeof(ut_id) */
         strncpy(lookup.ut_id, sanitize_id(id), sizeof(lookup.ut_id));
 
         found = getutxid(&lookup);
@@ -260,7 +260,7 @@ int utmp_put_dead_process(const char *id, pid_t pid, int code, int status) {
 
 
 int utmp_put_runlevel(int runlevel, int previous) {
-        struct utmpx store;
+        struct utmpx store = {};
         int r;
 
         assert(runlevel > 0);
@@ -347,16 +347,20 @@ static int write_to_terminal(const char *tty, const char *message) {
         return 0;
 }
 
-int utmp_wall(const char *message, bool (*match_tty)(const char *tty)) {
+int utmp_wall(const char *message, const char *username, bool (*match_tty)(const char *tty)) {
         _cleanup_free_ char *text = NULL, *hn = NULL, *un = NULL, *tty = NULL;
         char date[FORMAT_TIMESTAMP_MAX];
         struct utmpx *u;
         int r;
 
         hn = gethostname_malloc();
-        un = getlogname_malloc();
-        if (!hn || !un)
+        if (!hn)
                 return -ENOMEM;
+        if (!username) {
+                un = getlogname_malloc();
+                if (!un)
+                        return -ENOMEM;
+        }
 
         getttyname_harder(STDIN_FILENO, &tty);
 
@@ -364,7 +368,7 @@ int utmp_wall(const char *message, bool (*match_tty)(const char *tty)) {
                      "\a\r\n"
                      "Broadcast message from %s@%s%s%s (%s):\r\n\r\n"
                      "%s\r\n\r\n",
-                     un, hn,
+                     un ?: username, hn,
                      tty ? " on " : "", strempty(tty),
                      format_timestamp(date, sizeof(date), now(CLOCK_REALTIME)),
                      message) < 0)