getprogname(3)

NAME

getprogname, setprogname - get or set the program name

Standard C Library (libc, -lc)

#include <stdlib.h>
const char *
getprogname(void);
void
setprogname(const char *progname);

The getprogname() and setprogname() functions manipulate the
name of the current program. They are used by error-reporting routines
to produce consistent output.
The getprogname() function returns the name of the program.
If the name has not been set yet, it will return NULL.
The setprogname() function sets the name of the program to
be the last component of the progname argument. Since a pointer to the
given string is kept as the program name, it should not be modified for
the rest of the program's lifetime.
In FreeBSD, the name of the program is set by the start-up
code that is
run before main(); thus, running setprogname() is not neces
sary. Programs that desire maximum portability should still call it;
on another operating system, these functions may be implemented in a
portability
library. Calling setprogname() allows the aforementioned
library to learn the program name without modifications to the start-up
code.