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Revision 1.8, Sat May 21 19:06:44 2011 UTC (4 years ago) by dholland
Clarify paragraph about calling setprogname, requested by Tobias Ulmer on freenode. Bump date.
.\" $NetBSD: getprogname.3,v 1.8 2011/05/21 19:06:44 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 .\" 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. .\" .\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>> .\" .Dd May 21, 2011 .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 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 explicitly has no effect. However, portable programs that wish to use .Fn getprogname should call .Fn setprogname from .Fn main . On operating systems where .Fn getprogname and .Fn setprogname are implemented via a portability library, this call is needed to make the name available. .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.