util: replace close_nointr_nofail() by a more useful safe_close()

safe_close() automatically becomes a NOP when a negative fd is passed,
and returns -1 unconditionally. This makes it easy to write lines like
this:

        fd = safe_close(fd);

Which will close an fd if it is open, and reset the fd variable
correctly.

By making use of this new scheme we can drop a > 200 lines of code that
was required to test for non-negative fds or to reset the closed fd
variable afterwards.

1 files changed, 14 insertions, 30 deletions

diff --git a/src/core/socket.c b/src/core/socket.c
index b39bec2f26..b2a3e954cb 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -121,9 +121,7 @@ void socket_free_ports(Socket *s) {
 
                 sd_event_source_unref(p->event_source);
 
-                if (p->fd >= 0)
-                        close_nointr_nofail(p->fd);
-
+                safe_close(p->fd);
                 free(p->path);
                 free(p);
         }
@@ -700,7 +698,7 @@ static void socket_close_fds(Socket *s) {
                 if (p->fd < 0)
                         continue;
 
-                close_nointr_nofail(p->fd);
+                p->fd = safe_close(p->fd);
 
                 /* One little note: we should never delete any sockets
                  * in the file system here! After all some other
@@ -709,8 +707,6 @@ static void socket_close_fds(Socket *s) {
                  * we delete sockets in the file system before we
                  * create a new one, not after we stopped using
                  * one! */
-
-                p->fd = -1;
         }
 }
 
@@ -880,9 +876,7 @@ static int fifo_address_create(
 
 fail:
         label_context_clear();
-
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        safe_close(fd);
 
         return r;
 }
@@ -917,8 +911,7 @@ static int special_address_create(
         return 0;
 
 fail:
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        safe_close(fd);
 
         return r;
 }
@@ -977,9 +970,7 @@ static int mq_address_create(
         return 0;
 
 fail:
-        if (fd >= 0)
-                close_nointr_nofail(fd);
-
+        safe_close(fd);
         return r;
 }
 
@@ -1472,7 +1463,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 log_debug_unit(UNIT(s)->id, "Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
 
                 if (cfd >= 0)
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                 else  {
                         /* Flush all sockets by closing and reopening them */
                         socket_close_fds(s);
@@ -1520,7 +1511,7 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                 if (s->n_connections >= s->max_connections) {
                         log_warning_unit(UNIT(s)->id, "%s: Too many incoming connections (%u)", UNIT(s)->id, s->n_connections);
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                         return;
                 }
 
@@ -1535,7 +1526,7 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                         /* ENOTCONN is legitimate if TCP RST was received.
                          * This connection is over, but the socket unit lives on. */
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                         return;
                 }
 
@@ -1586,9 +1577,7 @@ fail:
                          bus_error_message(&error, r));
 
         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
-
-        if (cfd >= 0)
-                close_nointr_nofail(cfd);
+        safe_close(cfd);
 }
 
 static void socket_run_next(Socket *s) {
@@ -1819,8 +1808,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1839,8 +1827,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1859,8 +1846,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1878,8 +1864,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1897,8 +1882,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }