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New page describing program_invocation_name and 

program_invocation_short_name variables.
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Michael Kerrisk 2006-04-28 19:59:46 +00:00
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.\" Copyright (C) 2006 Michael Kerrisk <mtk-manpages@gmx.net>
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" "Software"), to deal in the Software without restriction, including
.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" permit persons to whom the Software is furnished to do so, subject to
.\" the following conditions:
.\"
.\" The above copyright notice and this permission notice shall be
.\" included in all copies or substantial portions of the Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.TH PROGRAM_INVOCATION_NAME 3 "2006-04-29" GNU
.SH NAME
program_invocation_name, program_invocation_short_name \- \
obtain name used to invoke calling program
.SH SYNOPSIS
.nf
.B #define _GNU_SOURCE
.B #include <errno.h>
.BI "extern char *" program_invocation_name ;
.BI "extern char *" program_invocation_short_name ;
.fi
.SH DESCRIPTION
.I program_invocation_name
contains the name that was used to invoke the calling program.
This is the same as the value of
.I argv[0]
in
.IR main (),
with the difference that the scope of
.I program_invocation_name
is global.
.I program_invocation_short_name
contains the basename component of name that was used to invoke
the calling program.
That is, it is the same value as
.IR program_invocation_name ,
with all text up to and including the final slash (/), if any, removed.
These variables automatically initialised by the glibc run-time
startup code.
.SH NOTES
The Linux-specific
.I /proc/[number]/cmdline
file provides access to similar information.
.SH "CONFORMING TO"
These variables are GNU extensions, and should not be
used in programs intended to be portable.
.SH SEE ALSO
.BR proc.5