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initialize_readline() is called with full pathname of executable which sets rl_readline_name to that value:
Breakpoint 1, initialize_readline (name=0x7fffffffc3be "/home/midenok/src/mariadb/trunk/opt/bin/mysql") at /home/midenok/src/mariadb/trunk/src/client/mysql.cc:2673
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2673 rl_readline_name = name;
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(gdb) bt
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#0 initialize_readline (name=0x7fffffffc3be "/home/midenok/src/mariadb/trunk/opt/bin/mysql") at /home/midenok/src/mariadb/trunk/src/client/mysql.cc:2673
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#1 0x0000000000417e50 in main (argc=1, argv=0xa15250) at /home/midenok/src/mariadb/trunk/src/client/mysql.cc:1243
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It is expected that rl_readline_name is initialized with static name not depending on the file name at all. This is needed for setting custom hotkeys in .inputrc, like:
$if mysql
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"\033OP": "nopager\n"
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"\033OQ": "pager most\n"
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"\033OR": "pager pt-visual-explain\n"
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"\033OS": "pager most\nshow table status;\n"
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$endif
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Example from GDB code:
2023 /* Setup important stuff for command line editing. */
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2024 rl_completion_word_break_hook = gdb_completion_word_break_characters;
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2025 rl_completion_entry_function = readline_line_completion_function;
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2026 set_rl_completer_word_break_characters (default_word_break_characters ());
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2027 rl_completer_quote_characters = get_gdb_completer_quote_characters ();
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2028 rl_completion_display_matches_hook = cli_display_match_list;
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2029 rl_readline_name = "gdb";
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2030 rl_terminal_name = getenv ("TERM");
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