109 lines
3.6 KiB
Groff
109 lines
3.6 KiB
Groff
.\" $NetBSD: getprogname.3,v 1.2 2001/09/16 02:30:24 wiz Exp $
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.\"
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.\" Copyright (c) 2001 Christopher G. Demetriou
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed for the
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.\" NetBSD Project. See http://www.netbsd.org/ for
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.\" information about NetBSD.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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.\"
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.Dd February 11, 2001
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.Dt GETPROGNAME 3
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.Os
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.Sh NAME
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.Nm getprogname ,
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.Nm setprogname
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.Nd get/set the name of the current program
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <stdlib.h>
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.Ft const char *
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.Fn getprogname "void"
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.Ft void
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.Fn setprogname "const char *name"
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.Sh DESCRIPTION
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These utility functions get and set the current program's name
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as used by various error-reporting functions.
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.Pp
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.Fn getprogname
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returns the name of the current program.
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This function is typically useful when generating error messages
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or other diagnostic output. If the program name has not been
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set,
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.Fn getprogname
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will return
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.Dv NULL .
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.Pp
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.Fn setprogname
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sets the name of the current program to be the last pathname
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component of the
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.Fa name
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argument. It should be invoked at the start of the program, using the
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.Fa argv[0]
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passed into the program's
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.Fn main
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function. A pointer into the string pointed to by the
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.Fa name
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argument is kept as the program name. Therefore, the string pointed
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to by
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.Fa name
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should not be modified during the rest of the program's operation.
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.Pp
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A program's name can only be set once, and in
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.Nx
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that is actually
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done by program start-up code that is run before
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.Fn main
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is called. Therefore, in
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.Nx ,
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calling
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.Fn setprogname
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from
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.Fn main
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has no effect. However, it does
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serve to increase the portability of the program:
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on other operating systems,
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.Fn getprogname
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and
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.Fn setprogname
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may be implemented by a portability library, and a call to
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.Fn setprogname
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allows that library to know the program name without
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modifications to that system's program start-up code.
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.Sh SEE ALSO
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.Xr err 3 ,
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.Xr setproctitle 3
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.Sh HISTORY
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The
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.Nm getprogname
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and
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.Nm setprogname
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function calls appeared in
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.Nx 1.6 .
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