- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

libc: Use O_CLOEXEC for various internal file descriptors.

This fixes a race condition where another thread may fork() before CLOEXEC
is set, unintentionally passing the descriptor to the child process.

This commit only adds O_CLOEXEC flags to open() or openat() calls where no
fcntl(fd, F_SETFD, FD_CLOEXEC) follows. The separate fcntl() call still
leaves a race window so it should be fixed later.

Sync with OpenBSD, primarily better signal and terminal handling.

Obtained from: OpenBSD
MFC after: 2 weeks

Fix build. I commented out getpass() in readpassphrase.c because the
implementation did not match our manpage description (i.e., it could
return NULL). I mistakenly thought we were still using getpass.c
because, for some reason, CVS never removed it from the tree.

Pointy hat received from: alfred
Kick in the groin to: CVS

Update readpassphrase(3)to the latest revisions. Changes are mainly due
to return value constraints now changing as well as more intelligent
handling of signals.

Obtained from: OpenBSD

fix compilation (include -> #include)

Should also include namespace.h

Submitted by: ru

Change certain syscalls from x to _x.

Prodded by: bde

Introduce readpassphrase(3), a superset of getpass(3). This
comes originally from Todd Miller.

Obtained from: OpenBSD