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 <[email protected]>
Pull Request: https://github.com/freebsd/freebsd/pull/96

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Fix exec_imgact_shell()'s handling of two error cases: (1) Previously, if
the first line of a script exceeded MAXSHELLCMDLEN characters, then
exec_imgact_shell() silently truncated the line and passe

Fix exec_imgact_shell()'s handling of two error cases: (1) Previously, if
the first line of a script exceeded MAXSHELLCMDLEN characters, then
exec_imgact_shell() silently truncated the line and passed on the truncated
interpreter name or argument. Now, exec_imgact_shell() will fail and return
ENOEXEC, which is the commonly used errno among Unix variants for this type
of error. (2) Previously, exec_imgact_shell()'s check on the length of the
interpreter's name was ineffective. In other words, exec_imgact_shell()
could not possibly fail and return ENAMETOOLONG. The reason being that the
length of the interpreter name had to exceed MAXSHELLCMDLEN characters in
order that ENAMETOOLONG be returned. But, the search for the end of the
interpreter name stops after at most MAXSHELLCMDLEN - 2 characters are
scanned. (In the end, this particular error is eventually discovered
outside of exec_imgact_shell() and ENAMETOOLONG is returned. So, the real
effect of this second change is that the error is detected earlier, in
exec_imgact_shell().)

Update the definition of MAXINTERP to the actual limit on the size of
the interpreter name that has been in effect since r142453 (from
2005).

In collaboration with: kib

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mdoc: move CAVEATS, BUGS and SECURITY CONSIDERATIONS sections to the
bottom of the manpages and order them consistently.

GNU groff doesn't care about the ordering, and doesn't even mention
CAVEATS a

mdoc: move CAVEATS, BUGS and SECURITY CONSIDERATIONS sections to the
bottom of the manpages and order them consistently.

GNU groff doesn't care about the ordering, and doesn't even mention
CAVEATS and SECURITY CONSIDERATIONS as common sections and where to put
them.

Found by: mdocml lint run
Reviewed by: ru

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Update xrefs from 4.3BSD to modern signal functions in various man pages.

sigvec(2) references have been updated to sigaction(2), sigsetmask(2) and
sigblock(2) to sigprocmask(2), sigpause(2) to sigs

Update xrefs from 4.3BSD to modern signal functions in various man pages.

sigvec(2) references have been updated to sigaction(2), sigsetmask(2) and
sigblock(2) to sigprocmask(2), sigpause(2) to sigsuspend(2).

Some legacy man pages still refer to them, that is OK.

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- Don't suggest opening file for writing in preparation for fexecve(2).
- execve(2)/fexecve(2) won't return ETXTBSY if file is open for reading.

Approved by: re (kib)

When calculating arguments to the interpreter for the shebang script
executed by fexecve(2), imgp->args->fname is NULL. Moreover, there is
no way to recover the path to the script being executed.
Do

When calculating arguments to the interpreter for the shebang script
executed by fexecve(2), imgp->args->fname is NULL. Moreover, there is
no way to recover the path to the script being executed.
Do what some other U*ixes do unconditionally, namely supply /dev/fd/n
as the script path when called from fexecve(). Document requirement of
having fdescfs mounted as caveat.

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Man pages for the openat(2), fexecve(2) and related syscalls.

Reviewed by: ru

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

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

Sort SEE ALSO references (in dictionary order, ignoring case).

Eliminate double whitespace.

Mechanically kill hard sentence breaks.

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

mdoc(7) police: Fixed abuses of the .Ar and .Em macros.

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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Document file descriptor reopening and current standardization status.

The .Fn function.

mdoc(7) police: markup the previous delta.

Return a more meaningful errno when the length of the interpreter
exceeds MAXSHELLCMDLEN to avoid secondary /bin/sh execution.

Update execve man page to reflect change.

Increase MAXSHELLCMDLEN to a

Return a more meaningful errno when the length of the interpreter
exceeds MAXSHELLCMDLEN to avoid secondary /bin/sh execution.

Update execve man page to reflect change.

Increase MAXSHELLCMDLEN to a slightly more meaningful value.

PR: kern/32106
Submitted by: [email protected]
Reviewed by: bsd
MFC after: 2 weeks

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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.

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: sort SEE ALSO xrefs (sort -b -f +2 -3 +1 -2).

mdoc(7) police: Change -filled displays (which just happen
to be the same as -ragged in the current implementation) to
-ragged. With mdocNG, -filled displays produce the correct
output, formatted a

mdoc(7) police: Change -filled displays (which just happen
to be the same as -ragged in the current implementation) to
-ragged. With mdocNG, -filled displays produce the correct
output, formatted and justified to both margins.

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