make mkdtemp and mkstemp family leave template unchanged on fail

also refactor mkdtemp based on new shared temp code, removing
dependency on the deprecated mktemp, whose behavior made this logic
more difficult.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/temp/mkostemps.c b/src/temp/mkostemps.c
index 8cc01e37..7f8492a1 100644
--- a/src/temp/mkostemps.c
+++ b/src/temp/mkostemps.c
@@ -16,12 +16,13 @@ int __mkostemps(char *template, int len, int flags)
 	}
 
 	int fd, retries = 100;
-	while (retries--) {
+	do {
 		__randname(template+l-len-6);
 		if ((fd = open(template, flags | O_RDWR | O_CREAT | O_EXCL, 0600))>=0)
 			return fd;
-		if (errno != EEXIST) return -1;
-	}
+	} while (--retries && errno == EEXIST);
+
+	memcpy(template+l-len-6, "XXXXXX", 6);
 	return -1;
 }