minix/lib/libc/gen/getprogname.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

116 lines
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.\" $NetBSD: getprogname.3,v 1.7 2008/03/29 16:51:40 dholland Exp $
.\"
.\" 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
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.\" 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
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
.\"
.Dd March 29, 2008
.Dt GETPROGNAME 3
.Os
.Sh NAME
.Nm getprogname ,
.Nm setprogname
.Nd get/set the name of the current program
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft const char *
.Fn getprogname "void"
.Ft void
.Fn setprogname "const char *name"
.Sh DESCRIPTION
These utility functions get and set the current program's name
as used by various error-reporting functions.
.Pp
.Fn getprogname
returns the name of the current program.
This function is typically useful when generating error messages
or other diagnostic output.
If the program name has not been set,
.Fn getprogname
will return
.Dv NULL .
.Pp
.Fn setprogname
sets the name of the current program to be the last pathname
component of the
.Fa name
argument.
It should be invoked at the start of the program, using the
.Fa argv[0]
passed into the program's
.Fn main
function.
A pointer into the string pointed to by the
.Fa name
argument is kept as the program name.
Therefore, the string pointed to by
.Fa name
should not be modified during the rest of the program's operation.
.Pp
A program's name can only be set once, and in
.Nx
that is actually
done by program start-up code that is run before
.Fn main
is called.
Therefore, in
.Nx ,
calling
.Fn setprogname
from
.Fn main
has no effect.
However, it does serve to increase the portability of the program:
on other operating systems,
.Fn getprogname
and
.Fn setprogname
may be implemented by a portability library, and a call to
.Fn setprogname
allows that library to know the program name without
modifications to that system's program start-up code.
.Sh SEE ALSO
.Xr err 3 ,
.Xr setproctitle 3
.Sh HISTORY
The
.Nm getprogname
and
.Nm setprogname
function calls appeared in
.Nx 1.6 .
.Sh RESTRICTIONS
The string returned by
.Fn getprogname
is supplied by the invoking process and should not be trusted by
setuid or setgid programs.