From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 19 Apr 2014 18:02:47 +0000 (+0300)
Subject: Use select when reading mount command output
X-Git-Url: http://git.tdb.fi/?p=pmount-gui.git;a=commitdiff_plain;h=0bf882489848c7f19eb602e286d760c709685251

Use select when reading mount command output

If pmount ends up using FUSE to do the actual mounting, the filesystem
driver process inherits the output capture pipe.  In this case the write
end of the pipe stays open and read can block indefinitely.  Instead of
relying on read to return eof, call waitpid if select indicates no data
available.
---

diff --git a/main.c b/main.c
index 609db22..916c2e2 100644
--- a/main.c
+++ b/main.c
@@ -566,22 +566,32 @@ void row_activated(GtkTreeView *list, GtkTreePath *path, GtkTreeViewColumn *colu
 			char buf[1024];
 			int pos = 0;
 			int status;
+			fd_set fds;
+			struct timeval timeout;
 
 			close(pipe_fd[1]);
+			FD_ZERO(&fds);
+			FD_SET(pipe_fd[0], &fds);
+			timeout.tv_sec = 0;
+			timeout.tv_usec = 200000;
 
 			while(1)
 			{
-				int len;
+				if(select(pipe_fd[0]+1, &fds, NULL, NULL, &timeout))
+				{
+					int len;
 
-				len = read(pipe_fd[0], buf+pos, sizeof(buf)-pos-1);
-				if(len<=0)
+					len = read(pipe_fd[0], buf+pos, sizeof(buf)-pos-1);
+					if(len<=0)
+						break;
+					pos += len;
+				}
+				else if(waitpid(pid, &status, 0))
 					break;
-				pos += len;
 			}
 
 			buf[pos] = 0;
 
-			waitpid(pid, &status, 0);
 			if(!WIFEXITED(status) || WEXITSTATUS(status))
 			{
 				GtkWidget *dialog;