get the name of the executable used to start the current process http://src.kaivo.net/lib/getprogname/
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README.md

getprogname

This liblet includes two functions, getprogname() and get_program_name(). The former is an implementation of the BSD function of the same name. The latter is a variant that takes a buffer to fill along with its size as arguments, rather than relying on a static variable. This makes it thread safe.

SYNOPSIS

#include "getprogname.h"

char *get_program_name(size_t n, char buf[static n]);
char *getprogname(void);

DESCRIPTION

These functions provide the current process's name as derived from the original contents of argv[0].

getprogname() returns a pointer to a static buffer, which may overwritten by future calls to getprogname().

get_program_name() will fill the buffer pointed to by buf, up to n bytes, with the current process name. The declaration syntax requires a compiler supporting at least C99, and allows the compiler to perform static analysis on the size of buf to ensure that it is at least n bytes in size.

RETURN VALUE

On failure, both functions return NULL. On success, getprogname() returns a pointer to a static buffer containing the current program name; get_program_name() returns a pointer to buf.