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\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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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[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
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.

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