X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Futmp-wtmp.c;h=217ae1e2c734ceca3168f1bbeb00463cc9766dbb;hp=de3805e0045bdf6331f4cc3241c417a8c550e648;hb=0071d9f1db6dc9a1035cf5afb81455b67ed462f6;hpb=d6c9574fb558d9e304699b1cc7522c3b133adfc9

diff --git a/src/utmp-wtmp.c b/src/utmp-wtmp.c
index de3805e00..217ae1e2c 100644
--- a/src/utmp-wtmp.c
+++ b/src/utmp-wtmp.c
@@ -92,19 +92,26 @@ int utmp_get_runlevel(int *runlevel, int *previous) {
         return r;
 }
 
-static void init_entry(struct utmpx *store, usec_t t) {
-        struct utsname uts;
-
+static void init_timestamp(struct utmpx *store, usec_t t) {
         assert(store);
 
         zero(*store);
-        zero(uts);
 
         if (t <= 0)
                 t = now(CLOCK_REALTIME);
 
         store->ut_tv.tv_sec = t / USEC_PER_SEC;
         store->ut_tv.tv_usec = t % USEC_PER_SEC;
+}
+
+static void init_entry(struct utmpx *store, usec_t t) {
+        struct utsname uts;
+
+        assert(store);
+
+        init_timestamp(store, t);
+
+        zero(uts);
 
         if (uname(&uts) >= 0)
                 strncpy(store->ut_host, uts.release, sizeof(store->ut_host));
@@ -148,11 +155,11 @@ static int write_entry_wtmp(const struct utmpx *store) {
         return -errno;
 }
 
-static int write_entry_both(const struct utmpx *store) {
+static int write_utmp_wtmp(const struct utmpx *store_utmp, const struct utmpx *store_wtmp) {
         int r, s;
 
-        r = write_entry_utmp(store);
-        s = write_entry_wtmp(store);
+        r = write_entry_utmp(store_utmp);
+        s = write_entry_wtmp(store_wtmp);
 
         if (r >= 0)
                 r = s;
@@ -165,10 +172,14 @@ static int write_entry_both(const struct utmpx *store) {
         return r;
 }
 
-int utmp_put_shutdown(usec_t t) {
+static int write_entry_both(const struct utmpx *store) {
+        return write_utmp_wtmp(store, store);
+}
+
+int utmp_put_shutdown(void) {
         struct utmpx store;
 
-        init_entry(&store, t);
+        init_entry(&store, 0);
 
         store.ut_type = RUN_LVL;
         strncpy(store.ut_user, "shutdown", sizeof(store.ut_user));
@@ -187,7 +198,72 @@ int utmp_put_reboot(usec_t t) {
         return write_entry_both(&store);
 }
 
-int utmp_put_runlevel(usec_t t, int runlevel, int previous) {
+static const char *sanitize_id(const char *id) {
+        size_t l;
+
+        assert(id);
+        l = strlen(id);
+
+        if (l <= sizeof(((struct utmpx*) NULL)->ut_id))
+                return id;
+
+        return id + l - sizeof(((struct utmpx*) NULL)->ut_id);
+}
+
+int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line) {
+        struct utmpx store;
+
+        assert(id);
+
+        init_timestamp(&store, 0);
+
+        store.ut_type = INIT_PROCESS;
+        store.ut_pid = pid;
+        store.ut_session = sid;
+
+        strncpy(store.ut_id, sanitize_id(id), sizeof(store.ut_id));
+
+        if (line)
+                strncpy(store.ut_line, file_name_from_path(line), sizeof(store.ut_line));
+
+        return write_entry_both(&store);
+}
+
+int utmp_put_dead_process(const char *id, pid_t pid, int code, int status) {
+        struct utmpx lookup, store, store_wtmp, *found;
+
+        assert(id);
+
+        setutxent();
+
+        zero(lookup);
+        lookup.ut_type = INIT_PROCESS; /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */
+        strncpy(lookup.ut_id, sanitize_id(id), sizeof(lookup.ut_id));
+
+        if (!(found = getutxid(&lookup)))
+                return 0;
+
+        if (found->ut_pid != pid)
+                return 0;
+
+        memcpy(&store, found, sizeof(store));
+        store.ut_type = DEAD_PROCESS;
+        store.ut_exit.e_termination = code;
+        store.ut_exit.e_exit = status;
+
+        zero(store.ut_user);
+        zero(store.ut_host);
+        zero(store.ut_tv);
+
+        memcpy(&store_wtmp, &store, sizeof(store_wtmp));
+        /* wtmp wants the current time */
+        init_timestamp(&store_wtmp, 0);
+
+        return write_utmp_wtmp(&store, &store_wtmp);
+}
+
+
+int utmp_put_runlevel(int runlevel, int previous) {
         struct utmpx store;
         int r;
 
@@ -207,7 +283,7 @@ int utmp_put_runlevel(usec_t t, int runlevel, int previous) {
         if (previous == runlevel)
                 return 0;
 
-        init_entry(&store, t);
+        init_entry(&store, 0);
 
         store.ut_type = RUN_LVL;
         store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8);
@@ -288,12 +364,11 @@ finish:
         return r;
 }
 
-int utmp_wall(const char *message) {
+int utmp_wall(const char *message, bool (*match_tty)(const char *tty)) {
         struct utmpx *u;
-        char date[26];
+        char date[FORMAT_TIMESTAMP_MAX];
         char *text = NULL, *hn = NULL, *un = NULL, *tty = NULL;
         int r;
-        time_t t;
 
         if (!(hn = gethostname_malloc()) ||
             !(un = getlogname_malloc())) {
@@ -301,18 +376,16 @@ int utmp_wall(const char *message) {
                 goto finish;
         }
 
-        if ((r = getttyname_malloc(&tty)) < 0)
-                goto finish;
-
-        time(&t);
-        assert_se(ctime_r(&t, date));
-        delete_chars(date, "\n\r");
+        getttyname_harder(STDIN_FILENO, &tty);
 
         if (asprintf(&text,
                      "\a\r\n"
-                     "Broadcast message from %s@%s on %s (%s):\r\n\r\n"
+                     "Broadcast message from %s@%s%s%s (%s):\r\n\r\n"
                      "%s\r\n\r\n",
-                     un, hn, tty, date, message) < 0) {
+                     un, hn,
+                     tty ? " on " : "", strempty(tty),
+                     format_timestamp(date, sizeof(date), now(CLOCK_REALTIME)),
+                     message) < 0) {
                 r = -ENOMEM;
                 goto finish;
         }
@@ -340,8 +413,9 @@ int utmp_wall(const char *message) {
                         path = buf;
                 }
 
-                if ((q = write_to_terminal(path, text)) < 0)
-                        r = q;
+                if (!match_tty || match_tty(path))
+                        if ((q = write_to_terminal(path, text)) < 0)
+                                r = q;
 
                 free(buf);
         }