1 /* $NetBSD: setproctitle.c,v 1.23 2021/04/20 21:42:32 christos Exp $ */
2
3 /*
4 * Copyright (c) 1994, 1995 Christopher G. Demetriou
5 * All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the
18 * NetBSD Project. See http://www.NetBSD.org/ for
19 * information about NetBSD.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
35 */
36
37 #include <sys/cdefs.h>
38 #if defined(LIBC_SCCS) && !defined(lint)
39 __RCSID("$NetBSD: setproctitle.c,v 1.23 2021/04/20 21:42:32 christos Exp $");
40 #endif /* LIBC_SCCS and not lint */
41
42 #include "namespace.h"
43 #include <sys/param.h>
44 #include <sys/types.h>
45 #include <sys/exec.h>
46 #include <stdarg.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include "csu-common.h"
51
52 #ifdef __weak_alias
__weak_alias(setproctitle,_setproctitle)53 __weak_alias(setproctitle,_setproctitle)
54 #endif
55
56 #define MAX_PROCTITLE 2048
57
58 void
59 setproctitle(const char *fmt, ...)
60 {
61 static char buf[MAX_PROCTITLE], *bufp;
62 const char *pname = getprogname();
63
64 if (fmt != NULL) {
65 int len = snprintf(buf, sizeof(buf), "%s: ", pname);
66 if (len >= 0) {
67 va_list ap;
68
69 va_start(ap, fmt);
70 (void)vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
71 va_end(ap);
72 }
73 } else
74 (void)snprintf(buf, sizeof(buf), "%s", pname);
75
76 bufp = buf;
77
78 #ifdef USRSTACK
79 /*
80 * For compatibility with old versions of crt0 and old kernels, set
81 * __ps_strings to a default value if it's null.
82 * But only if USRSTACK is defined. It might not be defined if
83 * user-level code can not assume it's a constant (i.e. m68k).
84 */
85 if (__ps_strings == 0)
86 __ps_strings = PS_STRINGS;
87 #endif /* USRSTACK */
88
89 if (__ps_strings != 0) {
90 __ps_strings->ps_nargvstr = 1;
91 __ps_strings->ps_argvstr = &bufp;
92 }
93 }
94