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DEBUG: cli: support closing "hard" using close() in addition to fd_delete()

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"debug dev close <fd>" currently closes that FD using fd_delete() after
checking that it's known from the fdtab. Sometimes we also want to just
perform a pure close() of FDs not in the fdtab (pollers, etc) in order
to provoke certain error cases. The optional "hard" argument to the
command will make it use a plain close() instead of fd_delete() and skip
the fd owner check. The main visible effect when closing a traffic socket
with it is that instead of dying from a double fd_delete() by seeing that
fd.owner is already 0, it will die during the next fd_insert() seeing that
fd.owner was not 0.
This commit is contained in:
Willy Tarreau 2024-11-05 17:43:35 +01:00
parent 393957908b
commit 0f1d37a479
1 changed files with 9 additions and 3 deletions
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12
src/debug.c
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@ -806,17 +806,23 @@ static int debug_parse_cli_close(char **args, char *payload, struct appctx *appc
return 1;
if (!*args[3])
return cli_err(appctx, "Missing file descriptor number.\n");
return cli_err(appctx, "Missing file descriptor number (optionally followed by 'hard').\n");
fd = atoi(args[3]);
if (fd < 0 || fd >= global.maxsock)
return cli_err(appctx, "File descriptor out of range.\n");
if (strcmp(args[4], "hard") == 0) {
/* hard silent close, even for unknown FDs */
close(fd);
goto done;
}
if (!fdtab[fd].owner)
return cli_msg(appctx, LOG_INFO, "File descriptor was already closed.\n");
_HA_ATOMIC_INC(&debug_commands_issued);
fd_delete(fd);
done:
_HA_ATOMIC_INC(&debug_commands_issued);
return 1;
}
@ -2649,7 +2655,7 @@ REGISTER_PER_THREAD_INIT(feed_post_mortem_late);
static struct cli_kw_list cli_kws = {{ },{
{{ "debug", "dev", "bug", NULL }, "debug dev bug : call BUG_ON() and crash", debug_parse_cli_bug, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "check", NULL }, "debug dev check : call CHECK_IF() and possibly crash", debug_parse_cli_check, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "close", NULL }, "debug dev close <fd> : close this file descriptor", debug_parse_cli_close, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "close", NULL }, "debug dev close <fd> [hard] : close this file descriptor", debug_parse_cli_close, NULL, NULL, NULL, ACCESS_EXPERT },
#if !defined(USE_OBSOLETE_LINKER)
{{ "debug", "dev", "counters", NULL }, "debug dev counters [all|bug|cnt|chk|?]* : dump/reset rare event counters", debug_parse_cli_counters, debug_iohandler_counters, NULL, NULL, 0 },
#endif