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      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
     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