use pwrite to always write at the begining of the file.. If multiple calls

to pidfile_write happen, the pidfile will have nul characters prepended
due to the cached file descriptor offset...

Reviewed by:	scottl
MFC after:	3 days

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/libutil/pidfile.c b/lib/libutil/pidfile.c
index 0b8ade1..cf7441e 100644
--- a/lib/libutil/pidfile.c
+++ b/lib/libutil/pidfile.c
@@ -175,7 +175,7 @@ pidfile_write(struct pidfh *pfh)
 	}
 
 	snprintf(pidstr, sizeof(pidstr), "%u", getpid());
-	if (write(fd, pidstr, strlen(pidstr)) != (ssize_t)strlen(pidstr)) {
+	if (pwrite(fd, pidstr, strlen(pidstr), 0) != (ssize_t)strlen(pidstr)) {
 		error = errno;
 		_pidfile_remove(pfh, 0);
 		errno = error;