Ticket #1897: Build breaks on ignored return values

Changes into lib directory

 * samba: handling result of system() call
 * rpc: handling write errors
 * ftpfs: ignoring result of fwrite() on logfile (make compiler happy ;-))
 * fish: proper handling of file io calls
 * ignoring result of fwrite() on logfile (make compiler happy ;-))
 * lib/util.c: handling fwrite() call errors in mc_util_write_backup_content()
 * lib/utilunix.c:
  * handling possible error on dup() in close_error_pipe()
  * handling possible error on getcwd() in mc_realpath()

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

lib/util.c

@@ -1241,6 +1241,7 @@ mc_util_write_backup_content (const char *from_file_name, const char *to_file_na
     FILE *backup_fd;
     char *contents;
     gsize length;
+    gboolean ret1 = TRUE;
 
     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
         return FALSE;
@@ -1252,12 +1253,15 @@ mc_util_write_backup_content (const char *from_file_name, const char *to_file_na
         return FALSE;
     }
 
-    fwrite ((const void *) contents, length, 1, backup_fd);
-
-    fflush (backup_fd);
-    fclose (backup_fd);
+    if (fwrite ((const void *) contents, length, 1, backup_fd) != length)
+        ret1 = FALSE;
+    {
+    int ret2;
+    ret2 = fflush (backup_fd);
+    ret2 = fclose (backup_fd);
+    }
     g_free (contents);
-    return TRUE;
+    return ret1;
 }
 
 /* Finds out a relative path from first to second, i.e. goes as many ..

lib/utilunix.c

@@ -410,8 +410,11 @@ close_error_pipe (int error, const char *text)
     else
 	title = _("Warning");
     if (old_error >= 0){
-	close (2);
-	dup (old_error);
+	if (dup2 (old_error, 2))
+	{
+	    message (error, MSG_ERROR, "%s", _("Error dup'ing old error pipe"));
+	    return 1;
+	}
 	close (old_error);
 	len = read (error_pipe[0], msg, MAX_PIPE_SIZE - 1);
 
@@ -617,13 +620,20 @@ mc_realpath (const char *path, char resolved_path[])
     max_path = copy_path + PATH_MAX - 2;
     /* If it's a relative pathname use getwd for starters. */
     if (*path != '/') {
-	/* Ohoo... */
-#ifdef HAVE_GETCWD
-	getcwd (new_path, PATH_MAX - 1);
-#else
-	getwd (new_path);
-#endif
-	new_path += strlen (new_path);
+
+	new_path = g_get_current_dir ();
+	if (new_path == NULL)
+	{
+	    strcpy(got_path, "");
+	}
+	else
+	{
+	    g_snprintf(got_path, PATH_MAX, "%s", new_path);
+	    g_free(new_path);
+            new_path = got_path;
+	}
+
+	new_path += strlen (got_path);
 	if (new_path[-1] != '/')
 	    *new_path++ = '/';
     } else {

lib/vfs/mc-vfs/direntry.c

@@ -1261,8 +1261,10 @@ vfs_s_get_line (struct vfs_class *me, int sock, char *buf, int buf_len, char ter
             return 0;
         if (logfile)
         {
-            fwrite (buf, 1, 1, logfile);
-            fflush (logfile);
+            size_t ret1;
+            int ret2;
+            ret1 = fwrite (buf, 1, 1, logfile);
+            ret2 = fflush (logfile);
         }
         if (*buf == term)
         {
@@ -1277,8 +1279,10 @@ vfs_s_get_line (struct vfs_class *me, int sock, char *buf, int buf_len, char ter
     {
         if (logfile)
         {
-            fwrite (&c, 1, 1, logfile);
-            fflush (logfile);
+            size_t ret1;
+            int ret2;
+            ret1 = fwrite (&c, 1, 1, logfile);
+            ret2 = fflush (logfile);
         }
         if (c == '\n')
             return 1;

lib/vfs/mc-vfs/extfs.c

@@ -706,7 +706,7 @@ extfs_resolve_symlinks_int (struct entry *entry, GSList * list)
 
         looping = g_slist_prepend (list, entry);
         pent = extfs_find_entry_int (entry->dir, entry->inode->linkname, looping, FALSE, FALSE);
-        g_slist_delete_link (looping, looping);
+        looping = g_slist_delete_link (looping, looping);
 
         if (pent == NULL)
             my_errno = ENOENT;

lib/vfs/mc-vfs/fish.c

@@ -159,8 +159,9 @@ fish_command (struct vfs_class *me, struct vfs_s_super *super, int wait_reply, c
 
     if (logfile)
     {
-        fwrite (str, strlen (str), 1, logfile);
-        fflush (logfile);
+	size_t ret;
+        ret = fwrite (str, strlen (str), 1, logfile);
+        ret = fflush (logfile);
     }
 
     tty_enable_interrupt_key ();
@@ -217,15 +218,13 @@ fish_pipeopen (struct vfs_s_super *super, const char *path, const char *argv[])
     }
     else
     {
-        close (0);
-        dup (fileset1[0]);
+        res = dup2 (fileset1[0], 0);
         close (fileset1[0]);
         close (fileset1[1]);
-        close (1);
+        res = dup2 (fileset2[1], 1);
         close (2);
-        dup (fileset2[1]);
         /* stderr to /dev/null */
-        open ("/dev/null", O_WRONLY);
+        res = open ("/dev/null", O_WRONLY);
         close (fileset2[0]);
         close (fileset2[1]);
         execvp (path, const_cast (char **, argv));
@@ -294,7 +293,6 @@ fish_open_archive_int (struct vfs_class *me, struct vfs_s_super *super)
         print_vfs_message ("%s", answer);
         if (strstr (answer, "assword"))
         {
-
             /* Currently, this does not work. ssh reads passwords from
                /dev/tty, not from stdin :-(. */
 
@@ -312,8 +310,16 @@ fish_open_archive_int (struct vfs_class *me, struct vfs_s_super *super)
                 SUP.password = op;
             }
             print_vfs_message (_("fish: Sending password..."));
-            write (SUP.sockw, SUP.password, strlen (SUP.password));
-            write (SUP.sockw, "\n", 1);
+
+            {
+                size_t str_len;
+                str_len = strlen (SUP.password);
+                if ((write (SUP.sockw, SUP.password, str_len ) != (ssize_t) str_len)
+                    || (write (SUP.sockw, "\n", 1) != 1))
+                {
+                    ERRNOR(EIO, -1);
+                }
+            }
         }
     }
 

lib/vfs/mc-vfs/ftpfs.c

@@ -361,8 +361,10 @@ ftpfs_command (struct vfs_class *me, struct vfs_s_super *super, int wait_reply,
     if (MEDATA->logfile) {
 	if (strncmp (cmdstr, "PASS ", 5) == 0) {
 	    fputs ("PASS <Password not logged>\r\n", MEDATA->logfile);
-	} else
-	    fwrite (cmdstr, cmdlen, 1, MEDATA->logfile);
+	} else {
+	    size_t ret;
+	    ret = fwrite (cmdstr, cmdlen, 1, MEDATA->logfile);
+	}
 
 	fflush (MEDATA->logfile);
     }

lib/vfs/mc-vfs/mcfsutil.c

@@ -113,7 +113,11 @@ rpc_send (int sock, ...)
 
 	case RPC_INT:
 	    tmp = htonl (va_arg (ap, int));
-	    write (sock, &tmp, sizeof (tmp));
+	    if (write (sock, &tmp, sizeof (tmp)) != sizeof(tmp))
+	    {
+		vfs_die ( "RPC: write failed (RPC_INT)" );
+		break;
+	    }
 	    CHECK_SIG_PIPE (sock);
 	    break;
 
@@ -121,9 +125,17 @@ rpc_send (int sock, ...)
 	    text = va_arg (ap, char *);
 	    len = strlen (text);
 	    tmp = htonl (len);
-	    write (sock, &tmp, sizeof (tmp));
+	    if (write (sock, &tmp, sizeof (tmp)) != sizeof(tmp))
+	    {
+		vfs_die ( "RPC: write failed (RPC_STRING)" );
+		break;
+	    }
 	    CHECK_SIG_PIPE (sock);
-	    write (sock, text, len);
+	    if (write (sock, text, len) != len)
+	    {
+		vfs_die ( "RPC: write failed (RPC_STRING)" );
+		break;
+	    }
 	    CHECK_SIG_PIPE (sock);
 	    break;
 
@@ -131,7 +143,11 @@ rpc_send (int sock, ...)
 	    len = va_arg (ap, int);
 	    text = va_arg (ap, char *);
 	    tmp = htonl (len);
-	    write (sock, text, len);
+	    if (write (sock, text, len) != len)
+	    {
+		vfs_die ( "RPC: write failed (RPC_BLOCK)" );
+		break;
+	    }
 	    CHECK_SIG_PIPE (sock);
 	    break;
 

lib/vfs/mc-vfs/samba/lib/util.c

@@ -2330,7 +2330,9 @@ void smb_panic(const char *why)
 {
 	const char *cmd = lp_panic_action();
 	if (cmd && *cmd) {
-		system(cmd);
+		if (system(cmd)) {
+		    DEBUG(0,("PANIC: cannot run panic handler command \"%s\"\n", cmd));
+		}
 	}
 	DEBUG(0,("PANIC: %s\n", why));
 	dbgflush();