libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

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Remove <sys/types.h> from the SYNOPSIS.

- connect(2) Clarify namelen

PR: 206838
Submitted by: t@tobik.me
Approved by: bcr (mentor)
MFH: after 1 week
Differential Revision: https://reviews.freebsd.org/D5194

Document [EPERM] for UNIX sockets.

MFC after: 2 weeks

Document EINVAL as per POSIX.

This also follows r124335-r124336, r225827.

PR: 191382
MFC after: 1 week
Sponsored by: Nginx, Inc.

Add ECONNRESET to list of possible errors in connect(2).

PR: 148683
Submitted by: Gennady Proskurin <gpr at mail dot ru>
Approved by: keramida (mentor)
MFC after: 1 week

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

Markup fixes.

Document EAGAIN failure per PR. (Finally!)

PR: 24125

Removed trailing whitespace.

Document that connect(2) can return EINTR, and that it
can return EALREADY for a socket in blocking mode as well.

Document an additional error return value. The connect(2) call can also
return EACCES on non-Unix domain sockets as demonstrated by the
following program:

#include <stdio.h>
#include <stdlib.h>
#in

Document an additional error return value. The connect(2) call can also
return EACCES on non-Unix domain sockets as demonstrated by the
following program:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int
main(int argc, char *argv[])
{
struct sockaddr_in rem_addr;
int sock;

if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket");
exit(1);
}

bzero((char *)&rem_addr, sizeof(rem_addr));
rem_addr.sin_family = AF_INET;
rem_addr.sin_addr.s_addr = INADDR_NONE;
rem_addr.sin_port = htons(10000);

if (connect(sock, (struct sockaddr *)&rem_addr,
sizeof(rem_addr)) < 0) {
perror("connect");
exit(1);
}
}

The call chain returning this value is probably:

kern/uipc_syscalls.c:connect
kern/uipc_socket.c:soconnect
netinet/tcp_usrreq.c:tcp_usr_connect
netinet/tcp_output.c:tcp_output
netinet/ip_output.c:ip_output

Reviewed by: schweikh (mentor)
MFC after: 2 weeks

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[1] - Document EHOSTUNREACH as a possible error

[2] - Remove a contraction

PR: docs/50401
Submitted by: [1] Slaven Rezic <slaven@rezic.de>
MFC after: 1 week

mdoc(7) police: "The .Fa argument.".

mdoc(7) police: Tidy up the syscall language.

Stop calling system calls "function calls".

Use "The .Fn system call" a-la "The .Nm utility".

When referring to a non-BSD implementation in
the HISTOR

mdoc(7) police: Tidy up the syscall language.

Stop calling system calls "function calls".

Use "The .Fn system call" a-la "The .Nm utility".

When referring to a non-BSD implementation in
the HISTORY section, call syscall a function,
to be safe.

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Remove the internal implementation details of wrapping syscalls,
which do not match the reality anyway.

Approved by: deischen, bde

mdoc(7) police: Use the new .In macro for #include statements.

Use the ``.Rv -std'' mdoc(7) macro in appropriate cases.

Reviewed by: ru

Remove whitespace at EOL.

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

mdoc(7) police: Er macro usage cleanup.