Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Turn execvpe() into an internal libc routine.

Adding exevpe() has caused some ports to break. Even though execvpe() is
a useful routine, it does not conform to any standards.

This patch is a little bit different from the patch sent to the mailing
list. I forgot to remove execvpe from the Symbol.map (which does not
seem to miscompile libc, though).

Reviewed by: davidxu
Approved by: philip

Add POSIX routines called posix_spawn() and posix_spawnp(), which
can be used as replacements for exec/fork in a lot of cases. This
change also added execvpe() which allows environment variable
PATH to be used for searching executable file, it is used for
implementing posix_spawnp().

PR: standards/122051

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

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

Expand *n't contractions.

Sort sections.

mdoc(7): Properly mark C headers.

With the latest mdoc(7), we can now fix the synopsis like this.

Desired by: bde

Add a libc function execvP that takes the search path as an arguement.
Change execvp to be a wrapper around execvP. This is necessary for some
of the /rescue pieces. It may also be more generally applicable as well.

Submitted by: Tim Kientzle <kientzle@acm.org>
Approved by: Silence on arch@

Make the execle() synopsis look (again) like a normal C prototype.
Also fixed the rest of ell (list) functions prototypes to include
a (commented out) terminating null pointer.

Pointed out by: bde
Obtained from: POSIX.1-2001
Glanced at by: imp

Fix the execle(3) synopsis to include the environment pointer.

Confused: anordby

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

mdoc(7) police: "The .Fn function".

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

begin executed --> being executed

Obtained from: NetBSD

Remove whitespace at EOL.

Remove duplicate words.

mdoc(7) police: Ft/Vt now accept punctuation-type arguments.

Remove fullstops from the end of .Xr lines in SEE ALSO section.

Correct incorrect information about the PATH used for exec*() calls.

PR: 21990
Partially submitted by: Gerhard Sittig <Gerhard.Sittig@gmx.net>

Whitespace only change: trim trailing whitespace.

Introduce ".Lb" macro to libc manpages.

More libraries manpages updates following.

$Id$ -> $FreeBSD$

Fixed searching of $PATH in execvp(). Do what sh(1) should do according
to POSIX.2. In particular:

- don't retry for ETXTBSY. This matches what sh(1) does. The retry code
was broken anyway. It only slept for several seconds for the first few
retries. Then it retried without sleeping.
- don't abort the search for errors related to the path prefix, in
particular for ENAMETOOLONG, ENOTDIR, ELOOP. This fixes PR1487. sh(1)
gets this wrong in the opposite direction by never aborting the search.
- don't confuse EACCES for errors related to the path prefix with EACCES
for errors related to the file. sh(1) gets this wrong.
- don't return a stale errno when the search terminates normally without
finding anything. The errno for the last unsuccessful execve() was
usually returned. This gave too much precedence to pathologies in the
last component of $PATH. This bug is irrelevant for sh(1).

The implementation still uses the optimization/race-inhibitor of trying
to execve() things first. POSIX.2 seems to require looking at file
permissions using stat(). We now use stat() after execve() if execve()
fails with an ambiguous error. Trying execve() first may actually be a
pessimization, since failing execve()s are fundamentally a little slower
than stat(), and are significantly slower when a file is found but has
unsuitable permissions or points to an unsuitable interpreter.

PR: 1487

Fixed synopsis. The envp arg for execle() can't be given in the prototype.
Fortunately, the man page doesn't refer to "envp" so just deleting it is OK.

Fixed various problems: typos, grammer, missing include files
wrong function type declarations, and wrong argument type
declarations.

Added missing section numbers to a bunch of .Xr macros, or
converted them into .Fn macros where appropriate. Also fixed
up some minor formatting problems.

Correct a bunch of man page cross references and generally
try and silence "manck".

ncurses, rpc, and some of the gnu stuff are still a big mess, however.

This commit was generated by cvs2svn to compensate for changes in r1573,
which included commits to RCS files with non-trunk default branches.

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