git: eab9ed3d48e0 - stable/13 - tzcode: Resurrect tzsetwall(3) with a deprecation warning.

The branch stable/13 has been updated by des:

URL: https://cgit.FreeBSD.org/src/commit/?id=eab9ed3d48e0842f3114d8582a4c2868a354190b

commit eab9ed3d48e0842f3114d8582a4c2868a354190b
Author:     Dag-Erling Smørgrav <des@FreeBSD.org>
AuthorDate: 2023-02-09 18:35:34 +0000
Commit:     Dag-Erling Smørgrav <des@FreeBSD.org>
CommitDate: 2023-02-13 13:58:41 +0000

    tzcode: Resurrect tzsetwall(3) with a deprecation warning.
    
    This function has been around since 4.4BSD but was dropped upstream in 2020.  This went unnoticed when tzcode was updated.  Bring it back, but prepare for removing it before 14.0 is released.
    
    PR:             269445
    MFC after:      3 days
    Reported by:    val@packett.cool
    Reviewed by:    emaste
    Differential Revision:  https://reviews.freebsd.org/D38445
    
    (cherry picked from commit 71e0c8906e1a4ff774f8ae810aeb94af039eedb7)
---
 contrib/tzcode/localtime.c | 21 +++++++++++++++++++--
 lib/libc/gen/tzset.3       | 14 +++++++++-----
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/contrib/tzcode/localtime.c b/contrib/tzcode/localtime.c
index 1b52e26a5faf..a8beaf47319a 100644
--- a/contrib/tzcode/localtime.c
+++ b/contrib/tzcode/localtime.c
@@ -1517,9 +1517,8 @@ zoneinit(struct state *sp, char const *name)
 }
 
 static void
-tzset_unlocked(void)
+tzset_unlocked_name(char const *name)
 {
-  char const *name = getenv("TZ");
   struct state *sp = lclptr;
   int lcl = name ? strlen(name) < sizeof lcl_TZname : -1;
   if (lcl < 0
@@ -1541,6 +1540,12 @@ tzset_unlocked(void)
   lcl_is_set = lcl;
 }
 
+static void
+tzset_unlocked(void)
+{
+  tzset_unlocked_name(getenv("TZ"));
+}
+
 void
 tzset(void)
 {
@@ -1550,6 +1555,18 @@ tzset(void)
   unlock();
 }
 
+void
+freebsd13_tzsetwall(void)
+{
+  if (lock() != 0)
+    return;
+  tzset_unlocked_name(NULL);
+  unlock();
+}
+__sym_compat(tzsetwall, freebsd13_tzsetwall, FBSD_1.0);
+__warn_references(tzsetwall,
+    "warning: tzsetwall() is deprecated, use tzset() instead.");
+
 static void
 gmtcheck(void)
 {
diff --git a/lib/libc/gen/tzset.3 b/lib/libc/gen/tzset.3
index ddeb40585f33..788a6259b727 100644
--- a/lib/libc/gen/tzset.3
+++ b/lib/libc/gen/tzset.3
@@ -31,7 +31,7 @@
 .\"	@(#)tzset.3	8.2 (Berkeley) 11/17/93
 .\" $FreeBSD$
 .\"
-.Dd November 17, 1993
+.Dd February 8, 2023
 .Dt TZSET 3
 .Os
 .Sh NAME
@@ -102,10 +102,14 @@ is used.
 .Pp
 The
 .Fn tzsetwall
-function
-sets things up so that
-.Xr localtime 3
-returns the best available approximation of local wall clock time.
+function is equivalent to calling
+.Fn tzset
+with the
+.Ev TZ
+environment variable unset.
+It is deprecated and may not be available in
+.Fx 14.0
+and later.
 .Sh SPECIFICATION FORMAT
 When
 .Ev TZ