xref: /dflybsd-src/lib/libc/upmap/ukp_setproctitle.c (revision b866b1dac9e41035fffd5f4cec3b0a24a95916b6)

/*
 * Copyright (c) 2014 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "namespace.h"
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/upmap.h>
#include <sys/time.h>
#include <machine/cpufunc.h>
#include <errno.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "libc_private.h"
#include "upmap.h"
#include "un-namespace.h"

static int fast_spt_state;
static int fast_spt_count;
static char *sptbuf;

/*
 * This is called from gen/setproctitle.c
 */
int
__ukp_spt(const char *fmt, va_list ap)
{
	size_t n;
	size_t t;

	if (fmt == NULL)
		return -1;
	if (fast_spt_state == 0 && fast_spt_count++ >= 10) {
		__upmap_map(&sptbuf, &fast_spt_state, UPTYPE_PROC_TITLE);
		__upmap_map(NULL, &fast_spt_state, 0);
	}
	if (fast_spt_state > 0) {
		t = UKPLEN_DECODE(UPTYPE_PROC_TITLE);
		if (fmt[0] == '-') {
			fmt++;
			n = 0;
		} else {
			n = snprintf(sptbuf, t, "%s: ", _getprogname());
		}
		vsnprintf(sptbuf + n, t - n, fmt, ap);
		return 0;
	} else {
		return -1;
	}
}