When system calls indicate an error they return -1, not some arbitrary
value < 0. errno is only updated in this case. Change all (most?)
callers of syscalls to follow this better, and let's see if this strictness
helps us in the future.

Use getaddrinfo() instead of the non-standard gethostbyname2().
OK deraadt@ jca@ jung@ florian@

Use reentrant versions of getpw{nam,uid} and getgr{nam,gid} within
libc to avoid reusing the static buffers returned by the non-reentrant
versions. Since this is inside libc we can use constants for the
buffer sizes instead of having to call sysconf().
OK guenther@ deraadt@

delete old lint ARGSUSED comments

Use waitpid() instead of wait() to avoid returning early from another child
exiting, and loop the waitpid() on EINTR

ok deraadt@ millert@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Make rcmdsh(3) not fail if it is passed a non resolvable hostname.
Instead, silently ignore the fact and instead let the underlying
ssh (or $RSH) command handle it.

ok millert@

uses ssh these days, not rsh; ok tedu

use calloc() to avoid malloc(n * m) overflows; checked by djm canacar jsg

zap rcsid.
split functions off res_debug.c so that getnetnamadr.c does not pull it
all when it's used.

okay deraadt@, krw@

ansify. ok deraadt@ moritz@

let rcmdsh work on hosts that don't have an ipv4 address.
If it works it is fine with me -- millert@

Add support for command line args in rshprog, e.g. "ssh -C".

Tack on MagniComp (BSD) license since this originally came from rdist.

more pid_t use

Use PF_UNSPEC as proto in socketpair() instead of just 0 for clarity.

Don't do a gethostbyname() on "localhost" since we need it to
be unmolested when we test whether or not to use a local shell
instead of rsh.

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

Don't dup stderr, you lose error messages and rsh does it for us anyway.

Adds rcmdsh() -- rcmd-alike using rsh (or specified shell).