Truncate pid file before writing new pid to it

Prevents trailing garbage in the file if the new pid has fewer digits
than the previous pid.

(Originally reported against Solaris dtlogin as Sun bug 6627150)

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/dm.c b/dm.c
index 655380e..c482017 100644
--- a/dm.c
+++ b/dm.c
@@ -910,6 +910,7 @@ StorePid (void)
 # endif
 #endif
 	}
+	ftruncate(pidFd, 0);
 	fprintf (pidFilePtr, "%5ld\n", (long)getpid ());
 	(void) fflush (pidFilePtr);
 	RegisterCloseOnFork (pidFd);