D27204.id87637.diff
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	Index: lib/libc/gen/getprogname.3
	===================================================================
	--- lib/libc/gen/getprogname.3
	+++ lib/libc/gen/getprogname.3
	@@ -31,7 +31,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd May 1, 2001
	+.Dd April 17, 2021
	.Dt GETPROGNAME 3
	.Os
	.Sh NAME
	@@ -84,6 +84,32 @@
	.Fn setprogname
	allows the aforementioned library to learn the program name without
	modifications to the start-up code.
	+.Sh EXAMPLES
	+The following example presents a simple program, which shows the difference
	+between
	+.Fn getprogname
	+and
	+.Va "argv[0]" .
	+.Bd -literal -offset indent
	+#include <stdio.h>
	+#include <stdlib.h>
	+
	+int
	+main(int argc, char** argv)
	+{
	+ printf("getprogname(): %s\en", getprogname());
	+ printf("argv[0]: %s\en", argv[0]);
	+ return (0);
	+}
	+.Ed
	+.Pp
	+When compiled and executed (e.g., with
	+.Ql ./a.out )
	+the output of the program is going to look like this:
	+.Bd -literal -offset indent
	+getprogname(): a.out
	+argv[0]: ./a.out
	+.Ed
	.Sh SEE ALSO
	.Xr err 3 ,
	.Xr setproctitle 3