>Number:         10675
>Category:       lib
>Synopsis:       __progname is not declared
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    lib-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 25 02:52:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Johan Danielsson
>Release:        *
>Organization:
>Environment:
	<machine, os, target, libraries (multiple lines)>
System: NetBSD blubb.pdc.kth.se 1.5B NetBSD 1.5B (BLUBB) #247: Mon Jul 10 13:56:19 CEST 2000 joda@blubb.pdc.kth.se:/usr/misc/src/netbsd/netbsd-cvs/src/sys/arch/i386/compile/BLUBB i386


>Description:

The __progname variable is not declared in any header file, yet a
*lot* of programs are using it to get their name (I find more than 150
declarations of __progname in basesrc).

To solve this I propose that two new functions be added to libc:

        const char *get_progname(void);
and
        void set_progname(const char *);

The first should return the `name' of the running program (effectively
__progname), and the second should set that name.

get_progname is hopefully quite uncontroversial.

The reason for set_progname is purly for portability. Most systems
don't have a __progname equivalent, and if you want to use
get_progname() in on such a system you have to set the progname when
the application starts. The most easy way I've found to do this is by
calling

        set_progname(argv[0]); 

the first thing you do in main. An implementation of set_progname can
be found in basesrc/crypto/dist/heimdal/lib/roken/warnerr.c. On
systems that already define __progname it does nothing; if this is
what it should do is open for discussion.

>How-To-Repeat:
Code inspection.
>Fix:

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD$");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"

extern char *__progname;		/* Program name, from crt0. */

const char *
get_progname(void)
{
    return __progname;
}

void
set_progname(const char *progname)
{
    /* do nothing */
}
>Release-Note:
>Audit-Trail:
>Unformatted: