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, 8 insertions, 17 deletions

diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index fa4d660215..1d067af229 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -234,11 +234,8 @@ static int ask_password_plymouth(
         r = 0;
 
 finish:
-        if (notify >= 0)
-                close_nointr_nofail(notify);
-
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        safe_close(notify);
+        safe_close(fd);
 
         free(packet);
 
@@ -372,7 +369,7 @@ static int parse_password(const char *filename, char **wall) {
                         r = ask_password_tty(message, not_after, filename, &password);
 
                         if (arg_console) {
-                                close_nointr_nofail(tty_fd);
+                                safe_close(tty_fd);
                                 release_terminal();
                         }
 
@@ -419,8 +416,7 @@ static int parse_password(const char *filename, char **wall) {
 finish:
         fclose(f);
 
-        if (socket_fd >= 0)
-                close_nointr_nofail(socket_fd);
+        safe_close(socket_fd);
 
         free(packet);
         free(socket_name);
@@ -492,7 +488,7 @@ static bool wall_tty_match(const char *path) {
                 return true;
 
         /* What, we managed to open the pipe? Then this tty is filtered. */
-        close_nointr_nofail(fd);
+        safe_close(fd);
         return false;
 }
 
@@ -614,14 +610,9 @@ static int watch_passwords(void) {
         r = 0;
 
 finish:
-        if (notify >= 0)
-                close_nointr_nofail(notify);
-
-        if (signal_fd >= 0)
-                close_nointr_nofail(signal_fd);
-
-        if (tty_block_fd >= 0)
-                close_nointr_nofail(tty_block_fd);
+        safe_close(notify);
+        safe_close(signal_fd);
+        safe_close(tty_block_fd);
 
         return r;
 }