man: Rewrite gerprogname(3bsd) from scratch

This gets rid of one of the last man pages with a BSD-4-clause license.

COPYING

@@ -37,39 +37,6 @@ License: BSD-4-clause-Niels-Provos
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Files:
- man/getprogname.3bsd
-Copyright:
- Copyright © 2001 Christopher G. Demetriou
- All rights reserved.
-License: BSD-4-clause-Christopher-G-Demetriou
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
- 3. All advertising materials mentioning features or use of this software
-    must display the following acknowledgement:
-          This product includes software developed for the
-          NetBSD Project.  See http://www.netbsd.org/ for
-          information about NetBSD.
- 4. The name of the author may not be used to endorse or promote products
-    derived from this software without specific prior written permission.
- .
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
 Files:
  include/bsd/err.h
  include/bsd/stdlib.h

man/getprogname.3bsd

@@ -1,6 +1,4 @@
-.\"
+.\" Copyright (c) 2022 Guillem Jover <guillem@hadrons.org>
-.\" Copyright (c) 2001 Christopher G. Demetriou
-.\" All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
@@ -10,34 +8,27 @@
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
+.\" 3. The name of the author may not be used to endorse or promote products
-.\"    must display the following acknowledgement:
-.\"          This product includes software developed for the
-.\"          NetBSD Project.  See http://www.netbsd.org/ for
-.\"          information about NetBSD.
-.\" 4. The name of the author may not be used to endorse or promote products
 .\"    derived from this software without specific prior written permission.
+.\" .
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.Dd August 03, 2022
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd May 1, 2001
 .Dt getprogname 3bsd
 .Os
 .Sh NAME
 .Nm getprogname ,
 .Nm setprogname
-.Nd get or set the program name
+.Nd get and set program name
 .Sh LIBRARY
 .ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
 .ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
@@ -54,46 +45,39 @@ for include usage.)
 .Sh DESCRIPTION
 The
 .Fn getprogname
-and
+returns a string with the current program name,
-.Fn setprogname
+excluding any directory component.
-functions manipulate the name of the current program.
+The function will return
-They are used by error-reporting routines to produce
+.Dv NULL
-consistent output.
+if it was unable to get the program name from any known source.
-.Pp
-The
-.Fn getprogname
-function returns the name of the program.
-If the name has not been set yet, it will return
-.Dv NULL .
 .Pp
 The
 .Fn setprogname
-function sets the name of the program to be the last component of the
+function sets the current program name,
-.Fa progname
+stripping any directory component prefix.
-argument.
+The function will keep a reference to the passed string pointer,
-Since a pointer to the given string is kept as the program name,
+so it must not be freed or modified while these functions might
-it should not be modified for the rest of the program's lifetime.
+be called.
 .Pp
-In
+The implementations on most BSDs will try to initialize the program name
-.Fx ,
+at program startup time, and
-the name of the program is set by the start-up code that is run before
+.Nm libbsd
-.Fn main ;
+will try to infer it from various known sources depending on the
-thus,
+target system.
-running
+But it is not a portable assumption that the program name will be set
-.Fn setprogname
+without calling
-is not necessary.
+.Fn setprogname ,
-Programs that desire maximum portability should still call it;
+so portable programs should always call it after starting up.
-on another operating system,
-these functions may be implemented in a portability library.
-Calling
-.Fn setprogname
-allows the aforementioned library to learn the program name without
-modifications to the start-up code.
 .Sh SEE ALSO
-.Xr err 3 ,
+.Xr setproctitle 3bsd .
-.Xr setproctitle 3bsd
 .Sh HISTORY
-These functions first appeared in
+The
+.Fn setprogname
+and
+.Fn getprogname
+functions first appeared in
 .Nx 1.6 ,
-and made their way into
+.Fx 4.4 ,
-.Fx 4.4 .
+.Dx 2.1
+and
+.Ox 5.4 .