be more forceful about not using these.
improvements sthen@, jmc@. okay millert@, jca@ jmc@

Add additional userland interfaces for setting close-on-exec on fds
when creating them: mkostemp(), mkostemps(), the 'e' mode letter for
fopen(), freopen(), fdopen(), and popen(). The close-on-exec flag will
be cleared by the action created by posix_spawn_file_actions_adddup2().

Also, add support for the C11 'x' mode letter for fopen() and freopen(),
setting O_EXCL when possibly creating files.

Note: this requires kernel support for pipe2() and dup3()!

ok millert@

Usually, you don't want macros in the .Nd line, so remove instances of .Tn
marking up words that are not trademarks (ASCII, I/O, NFS, TCP, TELNET).
While here, remove .Tn markup from the same words in the body
of these pages, too.

Use the fancy .In macro for includes. From Jan Klemkow. ok jmc schwarze

- do not call pthread_atfork(3) handlers when a multithreaded program
calls vfork(2). "untested, but looks OK" marc@
- document vfork(2), popen(3) and system(3) don't call atfork handlers
in multithreaded programs. okay jmc@

convert to new .Dd format;

- sync prototypes and header file excerpts to reality
- many grammar, punctuation, macro, layout, spelling/typos,
rewording, etc. fixes
- avoid first person
- sprinkle crossrefs where relevant

help & ok jmc

Be correct in our man pages when talking about NUL termination (that is,
termination with '\0') vs. null termination.
Input from krw@, jaredy@, jmc@. OK deraadt@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

- correct macro usage
- section reorder

mode -> type in description to match the synopsis.

Various repairs, mostly to get rid of short lines.

Consistify naming of RETURN VALUES section.

After some constructive criticism from pjanzen@ and some e-mail tag:

- only use the .Dv NULL form when referring explicitly to a function
argument or return value
- otherwise, use these forms:
o non-null
o null-terminated (hyphenated form for predicate adjective)
o else, null terminated, or null terminate, whichever the case
o null pointer, null byte, null string, etc.
- may use NUL to refer to an ASCII NUL, but it doesn't need a .Tn macro

In general, capitalizing the word "null" everywhere is unnecessary and makes
the man pages harder to read. The above is consistent with popular programming
texts (i.e., K&R, Stevens).

use \-1, not -1, to change the meaning of `-' to minus sign from hyphen;
pjanzen@

repairs; go back over some old files, because we should properly distinguish
between NUL and NULL, i.e., don't use the .Dv (defined variable) macro when
referring to an ASCII NUL

repairs

Cleanup xrefs under SEE ALSO. Specifically:

- Sort xrefs by section, and then alphabetically.
- Add missing commas between xref items.
- Remove commas from the last xref entry.
- Remove duplicate entries.

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision