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.Dd August 03, 2022
.Dt getprogname 3bsd
.Os
.Sh NAME
.Nm getprogname ,
.Nm setprogname
.Nd get and set program name
.Sh LIBRARY
.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
.ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
.Lb libbsd
.Sh SYNOPSIS
.In stdlib.h
(See
.Xr libbsd 7
for include usage.)
.Ft const char *
.Fn getprogname "void"
.Ft void
.Fn setprogname "const char *progname"
.Sh DESCRIPTION
The
.Fn getprogname
returns a string with the current program name,
excluding any directory component.
The function will return
.Dv NULL
if it was unable to get the program name from any known source.
.Pp
The
.Fn setprogname
function sets the current program name,
stripping any directory component prefix.
The function will keep a reference to the passed string pointer,
so it must not be freed or modified while these functions might
be called.
.Pp
The implementations on most BSDs will try to initialize the program name
at program startup time, and
.Nm libbsd
will try to infer it from various known sources depending on the
target system.
But it is not a portable assumption that the program name will be set
without calling
.Fn setprogname ,
so portable programs should always call it after starting up.
.Sh SEE ALSO
.Xr setproctitle 3bsd .
.Sh HISTORY
The
.Fn setprogname
and
.Fn getprogname
functions first appeared in
.Nx 1.6 ,
.Fx 4.4 ,
.Dx 2.1
and
.Ox 5.4 .