Only open regular files.

set close on exec for all opened files.

branches: 1.27.6;
From Anon Ymous:

- Remove all longjmp(3) calls from signal handlers. Instead, we post
to an internal signal queue and check that periodically. All signal
related code is now in sig.c, except for the SIGCHLD handler which
remains in popen.c as it is intimately tied to routines there.

- Handle SIGPIPE in type1() regardless of mime support, or else the
handler in execute() will prevent our error code from being returned
resulting in 'sawcom' not being set on the first command as it should.
This only affected the initial behavior of the "next" command without
mime support.

- Add the 'T' flag to many commands in cmdtab.c that should not look
like the first command. E.g., start mail on a mailbox with multiple
messages, run "set foo", then "next", and watch the second message get
displayed rather than the first as is the case without the first "set"
command.

- Add file descriptor and file handle leak detection. Enabled by
DEBUG_FILE_LEAK. This will likely disappear in the future.

- Fix a long standing (since import in 1993) longjmp() bug in
edstop(): the jmpbuf was invalid when quit() is called at the end of
main.

- Fix a long standing bug (since import in 1993) in snarf() where it
didn't strip whitespace correctly if the line consisted only of
whitespace.

- Lint cleanup.

- New Feature: "Header" command. This allows miscellaneous header
fields to be added to the header, e.g., "X-Organization:" or
"Reply-To:" fields.

- New Feature: "page-also" variable. This allows the specification of
additional commands to page. It is more flexible than "crt".

- Document the "pager-off" variable: if set, it disables paging
entirely.

branches: 1.26.26;
From Anon Ymous:

1) Statification of modules.

2) Implement the 'detach' and 'Detach' commands for extracting mime
parts from messages.

3) Teach mail to output "In-Reply-To" and "References" header fields
when replying so others can thread us.

4) Implement threading, sorting, and tagging, supported by the
following commands: 'flatten', 'reverse', 'sort', 'thread',
'unthread', 'down', 'tset', 'up', 'expose', 'hide', 'tag',
'untag', 'invtags', 'tagbelow', 'hidetags', 'showtags'.
See the manpage for details (when available - soon).

5) Implement a 'deldups' command to delete duplicate messages based on
their "Message-Id" field, e.g., in replies to a mailing list that
are also CCed to a subscriber. (This can also be accomplished with
the threading and tagging commands.)

6) Implement 'ifdef' and 'ifndef' commands, and make the conditionals
nestable (i.e., implement a conditional stack). The if/else/endif
commands existed before, but they were primitive and undocumented.
The 'if' command currently recognizes the "receiving", "sending",
and "headersonly" mode keywords.

7) Teach the message selecting routine to understand regular
expressions if "regex-search" is defined. Otherwise only case
insensitive substring matches are done (as in the past).

8) Teach the message selection routine to understand boolean
expressions. Improved "colon-modifier" support. See the manpage
for details (when available - soon).

9) Extend paging to all commands (where relevant).

10) Add shell like piping and redirection of (standard) output (if
"enable-piping" is defined). Extend completion to these contexts.

11) The manpage should follow soon!!!!

More fixes from Anon Ymous:


1) Removed the -B flag (it was stupid on my part) and added a short
description indicating how to accomplish the same thing under the
"Sending Mail" section of man mail(1).

2) Added a -H flag to dump the headers and exit. It takes optional
flags to restrict to old, new, read, unread, and deleted messages
(the later being kind of useless - it shares code with something
that already had it).

3) Restored the 'Save' command which somehow got mistakenly removed in
the last commit and add documentation for it! (My apologies to
its author.)

4) Added a 'mkread' command to mark messages as read (the inverse of
'unread'). Should we also have a 'mknew' command?

5) Added a 'smopts' command to keep a database of addresses and
sendmail options to be used when sending messages to those
addresses. See man mail(1) for a fuller description.

6) Added 'indentpreamble' and 'indentpostscript' variables whose
values are inserted before and after a quoted message (~m or ~M
escapes).
=20
7) Added string formatting abilities for the 'prompt', 'insertpreamble',
'insertpostscript', and header display strings. These strings
support all the strftime() format parameters as well as many more
specific to mail (see man mail(1)).

8) Fix the -a flag so that it only takes a single filename, unless
"mime-attach-list" is defined. This is more conventional and avoids
unexpected whitespace issues.

From our anonymous user:
- mime and character set handling
- command line editor and completion
- many code improvements

Coverity CID 3318: Remove stray semicolon that caused close to be called
unintentionally.

branches: 1.22.2;
Coverity CID 1224: Avoid closing a negative fd.

Pass lint completely.

WARNS=3

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

KNF: No space after casts.

Replace another tempnam() with mkstemp(), and remove the tempResid variable.
Inspired by OpenBSD.

Replace another tempnam with mkstemp (inspired by OpenBSD).
Replace perror with warn.
Use NULL instead of some cast 0.
s|/usr/mail|/var/mail| in a comment.

Check tmpdir for being empty and remove trailing slashes in it. Replace one
tempnam() with mkstemp(), and remove the tempQuit variable.
Inspired by OpenBSD.

Don't use special null string pointer (NOSTR), just use NULL.

ANSIfy, and minimal KNF.

fix nested externs
rename raise to upcase to avoid clash with raise(3)

Rename send() to sendmessage() to avoid conflict with send(2) in "libc".
Patch supplied by Geoff Adams in PR bin/9385.

Fix a pasto that would cause coredumps on exit when the mailbox has been
changed and new mail has arrived in the mean time. (PR bin/4644 Ken Wellsch)
While I'm here, fix typo in comment.

Work around gcc -Wuninitialized lossage.

Detect more errors while manipulating mailbox files and tell the user
about them. Don't truncate mailbox files when a write error has occured.

branches: 1.7.2;
WARNSify, fix .Nm usage, deprecate register, use <err.h>

Sync with 4.4BSD-Lite2

- Fix PR/105: Implement dot locking protocol and check return value of flock.
- Fix PR/2247: Don't call unknown users "ubluit". Issue an error message.
- Fix/add prototypes.
- Fix warnings.
- Use POSIX signal mask calls.
- RCSid police.

Use tempnam() to generate temporary file names instead of trying to
concatenate getenv("TMPDIR") and "RxXXXXXX" into fixed length arrays.

4.4-lite, plus our mods

Add RCS identifiers.

branches: 1.1.1;
Initial revision