libalpm: handle syscall interruption correctly

It is possible to throw EINTR from a system call such as open(), close(), or
waitpid() if custom signal handlers are set up and they are not initialized
with the SA_RESTART flag. This was noticed by Andreas Radke when ^C (SIGINT)
was given during the call to waitpid(), causing it to throw the EINTR error
and we could not accommodate it.

Simply wrap these calls in a simple loop that allows us to retry the call if
interrupted.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index b26c9702..da3463b0 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -254,7 +254,8 @@ int _alpm_lckmk()
 	_alpm_makepath(dir);
 	FREE(dir);
 
-	fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0000);
+	while((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0000)) == -1
+			&& errno == EINTR);
 	return(fd > 0 ? fd : -1);
 }