1 /*
2 * Copyright (c) 2014 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "namespace.h"
36 #include <sys/cdefs.h>
37 #include <sys/types.h>
38 #include <sys/syscall.h>
39 #include <sys/upmap.h>
40 #include <sys/time.h>
41 #include <machine/cpufunc.h>
42 #include <errno.h>
43 #include <time.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47
48 #include "libc_private.h"
49 #include "upmap.h"
50 #include "un-namespace.h"
51
52 static int fast_spt_state;
53 static int fast_spt_count;
54 static char *sptbuf;
55
56 /*
57 * This is called from gen/setproctitle.c
58 */
59 int
__ukp_spt(const char * fmt,va_list ap)60 __ukp_spt(const char *fmt, va_list ap)
61 {
62 size_t n;
63 size_t t;
64
65 if (fmt == NULL)
66 return -1;
67 if (fast_spt_state == 0 && fast_spt_count++ >= 10) {
68 __upmap_map(&sptbuf, &fast_spt_state, UPTYPE_PROC_TITLE);
69 __upmap_map(NULL, &fast_spt_state, 0);
70 }
71 if (fast_spt_state > 0) {
72 t = UKPLEN_DECODE(UPTYPE_PROC_TITLE);
73 if (fmt[0] == '-') {
74 fmt++;
75 n = 0;
76 } else {
77 n = snprintf(sptbuf, t, "%s: ", _getprogname());
78 }
79 vsnprintf(sptbuf + n, t - n, fmt, ap);
80 return 0;
81 } else {
82 return -1;
83 }
84 }
85