Revise the mailbox locking functions.

The locker is created by the following call:

    mu_locker_create_ext(&locker, filename, &hints);

The last arguments points to a structure mu_locker_hints_t, which
defines the settings for the locker.  NULL value implies default.
Settings of an existing locker can be modified using the following
call:

    mu_locker_modify(locker, &hints);

Current settings can be examined using mu_locker_get_hints.

The functions mu_locker_destroy, mu_locker_lock_mode, mu_locker_lock,
mu_locker_touchlock, mu_locker_unlock, and mu_locker_remove_lock remained
unchanged.  Rest of functions is deprecated, but retained for a couple
of releases for the sake of backward compatibility.

Constants (locker types, flags, etc) are also revisited.

This commit also fixes a bug in mu_spawnvp function, which was discovered
when testing external lockers.

* include/mailutils/locker.h: Major rewrite.
(MU_LOCKER_DEFAULT_EXPIRE_TIME)
(MU_LOCKER_DEFAULT_RETRY_COUNT)
(MU_LOCKER_DEFAULT_RETRY_SLEEP)
(MU_LOCKER_DEFAULT_EXT_LOCKER): New defines.
(mu_locker_hints_t): New data type.
(MU_LOCKER_FLAG_RETRY)
(MU_LOCKER_FLAG_EXPIRE_TIME)
(MU_LOCKER_FLAG_CHECK_PID)
(MU_LOCKER_FLAG_TYPE,MU_LOCKER_FLAGS_ALL): New defines.
(mu_locker_create_ext, mu_locker_modify)
(mu_locker_get_hints): New functions.
(mu_locker_create,mu_locker_set_default_flags)
(mu_locker_set_default_retry_timeout)
(mu_locker_set_default_retry_count)
(mu_locker_set_default_expire_timeout)
(mu_locker_set_default_external_program)
(mu_locker_set_flags,mu_locker_mod_flags)
(mu_locker_set_expire_time,mu_locker_set_retries)
(mu_locker_set_retry_sleep,mu_locker_set_external)
(mu_locker_get_flags,mu_locker_get_expire_time)
(mu_locker_get_retries,mu_locker_get_retry_sleep): Mark as deprecated.
* libmailutils/base/locker.c: Rewrite.
* libmailutils/cli/stdcapa.c: New locking statements: type and
retry-sleep.  retry-timeout is deprecated.

* libmailutils/tests/lck.c: Use new locker functions.
* libmailutils/tests/lock.at: Test the external locker.

* libmailutils/base/spawnvp.c (mu_spawnvp): Restore the default SIGCHLD
handler while waiting for the process to terminate.

* dotlock/dotlock.c: Use new locker functions.
* lib/manlock.c: Likewise.
* libmailutils/base/amd.c: Likewise.
* libmu_dbm/berkeley.c: Likewise.
* libmu_sieve/extensions/vacation.c: Likewise.
* libproto/dotmail/dotmail.c: Likewise.
* libproto/mbox/mboxrd.c: Likewise.
* mail/copy.c: Likewise.

* mda/lmtpd/lmtpd.c: Modify mu_locker_defaults instead of using
deprecated functions.
* mda/mda/mda.c: Likewise.
* mda/putmail/putmail.c: Likewise.

* NEWS: Document changes.
* configure.ac: Version 3.12.90.
* doc/texinfo/Makefile.am: Add programs/dotlock.texi
* doc/texinfo/programs.texi: Rewrite the locking section.
New section: dotlock.
* doc/texinfo/programs/dotlock.texi: New file.

1 files changed, 1 insertions, 1 deletions

diff --git a/libmailutils/base/amd.c b/libmailutils/base/amd.c
index 349a8060a..e488da153 100644
--- a/libmailutils/base/amd.c
+++ b/libmailutils/base/amd.c
@@ -500,7 +500,7 @@ amd_open (mu_mailbox_t mailbox, int flags)
   _amd_prop_create (amd);
   
   if (mailbox->locker == NULL)
-    mu_locker_create (&mailbox->locker, "/dev/null", 0);
+    mu_locker_create_ext (&mailbox->locker, "/dev/null", NULL);
   
   return 0;
 }