FM / linux

/usr/share/systemtap/runtime/linux

Name	Size	Mode	Actions
uprobes/	-	0755	rm
uprobes2/	-	0755	rm
access_process_vm.h	4311	0644	edit dl rm
addr-map.c	9749	0644	edit dl rm
alloc.c	15900	0644	edit dl rm
arith.c	16799	0644	edit dl rm
autoconf-514-panic.c	68	0644	edit dl rm
autoconf-access_ok_2args.c	90	0644	edit dl rm
autoconf-alloc-percpu-align.c	118	0644	edit dl rm
autoconf-asm-syscall.c	51	0644	edit dl rm
autoconf-atomic_fetch_add_unless.c	94	0644	edit dl rm
autoconf-bio-bi_opf.c	824	0644	edit dl rm
autoconf-blk-types.c	359	0644	edit dl rm
autoconf-compat-utimbuf.c	53	0644	edit dl rm
autoconf-compat_sigaction.c	448	0644	edit dl rm
autoconf-constant-tsc.c	63	0644	edit dl rm
autoconf-cpu-clock.c	1277	0644	edit dl rm
autoconf-dpath-path.c	121	0644	edit dl rm
autoconf-files_lookup_fd_raw.c	136	0644	edit dl rm
autoconf-from_kuid_munged.c	191	0644	edit dl rm
autoconf-fs_supers-hlist.c	354	0644	edit dl rm
autoconf-generated-compile.c	56	0644	edit dl rm
autoconf-genhd.c	201	0644	edit dl rm
autoconf-get-kretprobe.c	107	0644	edit dl rm
autoconf-get_user_pages-flags.c	1549	0644	edit dl rm
autoconf-get_user_pages-notask_struct.c	1301	0644	edit dl rm
autoconf-get_user_pages_remote-flags.c	1550	0644	edit dl rm
autoconf-get_user_pages_remote-flags_locked.c	1331	0644	edit dl rm
autoconf-get_user_pages_remote-notask_struct.c	1438	0644	edit dl rm
autoconf-grsecurity.c	219	0644	edit dl rm
autoconf-hlist-4args.c	296	0644	edit dl rm
autoconf-hlist_add_tail_rcu.c	112	0644	edit dl rm
autoconf-hrtimer-getset-expires.c	126	0644	edit dl rm
autoconf-hrtimer-rel.c	87	0644	edit dl rm
autoconf-hw_breakpoint_context.c	315	0644	edit dl rm
autoconf-inode-private.c	173	0644	edit dl rm
autoconf-inode-rwsem.c	172	0644	edit dl rm
autoconf-inode-uretprobes.c	264	0644	edit dl rm
autoconf-kernel_read-new-args.c	1030	0644	edit dl rm
autoconf-kprobe-symbol-name.c	90	0644	edit dl rm
autoconf-ktime-get-real.c	98	0644	edit dl rm
autoconf-linux-sched_headers.c	1678	0644	edit dl rm
autoconf-local-clock.c	1282	0644	edit dl rm
autoconf-lockdown-debugfs.c	102	0644	edit dl rm
autoconf-lockdown-kernel.c	90	0644	edit dl rm
autoconf-mm-context-vdso-base.c	117	0644	edit dl rm
autoconf-mm-context-vdso.c	114	0644	edit dl rm
autoconf-mm-shmempages.c	72	0644	edit dl rm
autoconf-mmap_lock.c	175	0644	edit dl rm
autoconf-module-sect-attrs.c	158	0644	edit dl rm
autoconf-module_layout.c	52	0644	edit dl rm
autoconf-mod_kallsyms.c	51	0644	edit dl rm
autoconf-nameidata.c	96	0644	edit dl rm
autoconf-netfilter-4_1.c	769	0644	edit dl rm
autoconf-netfilter-4_4.c	1460	0644	edit dl rm
autoconf-netfilter-313b.c	602	0644	edit dl rm
autoconf-netfilter.c	422	0644	edit dl rm
autoconf-old-inode-uprobes.c	357	0644	edit dl rm
autoconf-oneachcpu-retry.c	957	0644	edit dl rm
autoconf-pagefault_disable.c	137	0644	edit dl rm
autoconf-pde_data.c	226	0644	edit dl rm
autoconf-perf-structpid.c	444	0644	edit dl rm
autoconf-procfs-owner.c	158	0644	edit dl rm
autoconf-proc_ops.c	566	0644	edit dl rm
autoconf-rcu_is_watching.c	385	0644	edit dl rm
autoconf-real-parent.c	427	0644	edit dl rm
autoconf-regset.c	239	0644	edit dl rm
autoconf-relay-umode_t.c	730	0644	edit dl rm
autoconf-relay_buf-per_cpu_ptr.c	920	0644	edit dl rm
autoconf-ring_buffer-flags.c	112	0644	edit dl rm
autoconf-ring_buffer_lost_events.c	296	0644	edit dl rm
autoconf-ring_buffer_read_prepare.c	181	0644	edit dl rm
autoconf-save-stack-trace-no-bp.c	498	0644	edit dl rm
autoconf-save-stack-trace.c	501	0644	edit dl rm
autoconf-set_fs.c	221	0644	edit dl rm
autoconf-smpcall-4args.c	166	0644	edit dl rm
autoconf-smpcall-5args.c	169	0644	edit dl rm
autoconf-stack-trace-save-regs.c	176	0644	edit dl rm
autoconf-stacktrace_ops-int-address.c	409	0644	edit dl rm
autoconf-stacktrace_ops-warning.c	188	0644	edit dl rm
autoconf-syscall_get_args_3args.c	239	0644	edit dl rm
autoconf-task-state.c	550	0644	edit dl rm
autoconf-task-uid.c	152	0644	edit dl rm
autoconf-task_work-struct.c	219	0644	edit dl rm
autoconf-time32-old.c	52	0644	edit dl rm
autoconf-time32.c	53	0644	edit dl rm
autoconf-timerfd.c	232	0644	edit dl rm
autoconf-trace-printk.c	151	0644	edit dl rm
autoconf-tracepoint-has-data.c	493	0644	edit dl rm
autoconf-tracepoint-strings.c	233	0644	edit dl rm
autoconf-uaccess.c	28	0644	edit dl rm
autoconf-uapi-mount.c	52	0644	edit dl rm
autoconf-udelay_simple.c	90	0644	edit dl rm
autoconf-uidgid.c	50	0644	edit dl rm
autoconf-unwind-stack-trace.c	326	0644	edit dl rm
autoconf-uprobe-get-pc.c	374	0644	edit dl rm
autoconf-utrace-regset.c	273	0644	edit dl rm
autoconf-utrace-via-tracepoints.c	1712	0644	edit dl rm
autoconf-vm-area-pte.c	141	0644	edit dl rm
autoconf-walk-stack.c	217	0644	edit dl rm
autoconf-x86-fs.c	90	0644	edit dl rm
autoconf-x86-gs.c	90	0644	edit dl rm
autoconf-x86-uniregs.c	140	0644	edit dl rm
autoconf-x86-xfs.c	91	0644	edit dl rm
common_session_state.h	3249	0644	edit dl rm
compat_net.h	858	0644	edit dl rm
compat_structs.h	4409	0644	edit dl rm
compat_unistd.h	68384	0644	edit dl rm
copy.c	2717	0644	edit dl rm
debug.h	2978	0644	edit dl rm
io.c	5291	0644	edit dl rm
itrace.c	14874	0644	edit dl rm
kprobes.c	25126	0644	edit dl rm
loc2c-runtime.h	29874	0644	edit dl rm
map_list.h	1220	0644	edit dl rm
map_runtime.h	5266	0644	edit dl rm
namespaces.h	7128	0644	edit dl rm
netfilter.c	1410	0644	edit dl rm
perf.c	7596	0644	edit dl rm
perf.h	1272	0644	edit dl rm
perf_event_counter_context.c	336	0644	edit dl rm
perf_probe_handler_nmi.c	278	0644	edit dl rm
perf_read.h	959	0644	edit dl rm
print.c	11402	0644	edit dl rm
probe_lock.h	1807	0644	edit dl rm
regs-ia64.c	3741	0644	edit dl rm
regs.c	13490	0644	edit dl rm
runtime.h	12591	0644	edit dl rm
runtime_context.h	6089	0644	edit dl rm
runtime_defines.h	1041	0644	edit dl rm
stap_mmap_lock.h	343	0644	edit dl rm
stat_runtime.h	1774	0644	edit dl rm
stp_tls.h	1181	0644	edit dl rm
stp_tracepoint.c	11481	0644	edit dl rm
stp_tracepoint.h	2270	0644	edit dl rm
syscalls-common.h	976	0644	edit dl rm
task_finder.c	53860	0644	edit dl rm
task_finder2.c	57640	0644	edit dl rm
task_finder_map.c	5194	0644	edit dl rm
task_finder_stubs.c	2442	0644	edit dl rm
task_work_compatibility.h	1283	0644	edit dl rm
timer.c	2200	0644	edit dl rm
timer.h	1383	0644	edit dl rm
timer_compatibility.h	2317	0644	edit dl rm
uprobes-common.c	15573	0644	edit dl rm
uprobes-common.h	1653	0644	edit dl rm
uprobes-inc.h	484	0644	edit dl rm
uprobes-inode.c	34086	0644	edit dl rm

Edit: /usr/share/systemtap/runtime/linux/io.c (5291B)

/* -*- linux-c -*- 
 * I/O for printing warnings, errors and debug messages
 * Copyright (C) 2005-2009 Red Hat Inc.
 *
 * This file is part of systemtap, and is free software.  You can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License (GPL); either version 2, or (at your option) any
 * later version.
 */

#ifndef _STAPLINUX_IO_C_
#define _STAPLINUX_IO_C_

/** @file io.c
 * @brief I/O for printing warnings, errors and debug messages.
 */
/** @addtogroup io I/O
 * @{
 */

#define WARN_STRING "WARNING: "
#define ERR_STRING "ERROR: "

enum code { WARN=1, ERROR, DBUG };

static void _stp_vlog (enum code type, const char *func, int line, const char *fmt, va_list args)
        __attribute ((format (printf, 4, 0)));

static void _stp_vlog (enum code type, const char *func, int line, const char *fmt, va_list args)
{
	int prefix_len, msg_len;
	struct _stp_log *log;
	unsigned long flags;
	va_list args_copy;
	char *buf;

/* Warnings and errors are printed to the control channel */
	switch (type) {
	case WARN:
		_stp_ctl_log_werr(WARN_STRING, sizeof(WARN_STRING) - 1,
				  fmt, args);
		return;
	case ERROR:
		_stp_ctl_log_werr(ERR_STRING, sizeof(ERR_STRING) - 1,
				  fmt, args);
		return;
	case DBUG:
		/* Debug messages are handled below */
		break;
	}

/*
	 * Calculate the total possible length of the debug message. It's the
	 * length of the prefix plus the length of the message plus one in case
	 * a newline character needs to be appended. Note that we need a copy of
	 * the va_list arguments because the vsnprintf() call will erase them.
	 */
	prefix_len = snprintf(NULL, 0, "%s:%d: ", func, line);
	va_copy(args_copy, args);
	msg_len = vsnprintf(NULL, 0, fmt, args_copy);
	va_end(args_copy);

if (!_stp_print_trylock_irqsave(&flags))
		return;

buf = _stp_reserve_bytes(prefix_len + msg_len + 1);
	if (!buf)
		goto err_unlock;

/*
	 * We can use raw *sprintf() here because the sizes have already been
	 * validated. Additionally, the reserved size accomodates for an extra
	 * byte so there won't be an overflow when the NUL termination is added
	 * by *sprintf(). The NUL termination isn't desired but there isn't any
	 * way to prevent it from being added.
	 */
	sprintf(buf, "%s:%d: ", func, line);
	vsprintf(buf + prefix_len, fmt, args);

/*
	 * Make sure the last character is a newline. If it already is, then
	 * discard the extra byte that was reserved.
	 */
	if (buf[prefix_len + msg_len - 1] != '\n')
		buf[prefix_len + msg_len] = '\n';
	else
		_stp_unreserve_bytes(1);

/* Flush the log now so userspace is quickly notified of the message */
	log = per_cpu_ptr(_stp_log_pcpu, raw_smp_processor_id());
	__stp_print_flush(log);
err_unlock:
	_stp_print_unlock_irqrestore(&flags);
}

/** Prints warning.
 * This function sends a warning message immediately to staprun. It
 * will also be sent over the bulk transport (relayfs) if it is
 * being used. If the last character is not a newline, then one 
 * is added. 
 * @param fmt A variable number of args.
 */
static void _stp_warn (const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	_stp_vlog (WARN, NULL, 0, fmt, args);
	va_end(args);
}

/** Exits and unloads the module.
 * This function sends a signal to staprun to tell it to
 * unload the module and exit. The module will not be 
 * unloaded until after the current probe returns.
 * @note Be careful to not treat this like the Linux exit() 
 * call. You should probably call return immediately after 
 * calling _stp_exit().
 */
static void _stp_exit (void)
{
	/* Just set the flag since this is possibly called from
	   kprobe context. A timer will come along and call
	   _stp_request_exit() for us.  */
	_stp_exit_flag = 1;
}

/** Prints error message and exits.
 * This function sends an error message immediately to staprun. It
 * will also be sent over the bulk transport (relayfs) if it is
 * being used. If the last character is not a newline, then one 
 * is added. 
 *
 * After the error message is displayed, the module will transition
 * to exiting-state (as if ^C was pressed) and will eventually unload.
 * @param fmt A variable number of args.
 * @sa _stp_exit().
 *
 * NB: this function should not be used from script-accessible tapset
 * functions.  Those should simply set CONTEXT->last_error, so that
 * script-level try/catch blocks can handle them.  This is for random
 * runtime internal matters that a script didn't invoke and can't
 * expect to handle.
 */
static void _stp_error (const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	_stp_vlog (ERROR, NULL, 0, fmt, args);
	va_end(args);
	_stp_exit();
}

/** Prints error message.
 * This function sends an error message immediately to staprun. It
 * will also be sent over the bulk transport (relayfs) if it is
 * being used. If the last character is not a newline, then one 
 * is added. 
 *
 * @param fmt A variable number of args.
 * @sa _stp_error
 */
static void _stp_softerror (const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	_stp_vlog (ERROR, NULL, 0, fmt, args);
	va_end(args);
}

static void _stp_dbug (const char *func, int line, const char *fmt, ...)
{
	va_list args;
	va_start(args, fmt);
	_stp_vlog (DBUG, func, line, fmt, args);
	va_end(args);
}

/** @} */
#endif /* _STAPLINUX_IO_C_ */

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