lib/libc/gen/setproctitle.c

   1 /* $NetBSD: setproctitle.c,v 1.22 2008/01/03 04:26:27 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 1.22 2008/01/03 04:26:27 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
  51 #ifdef __weak_alias
  52 __weak_alias(setproctitle,_setproctitle)
  53 #endif
  54
  55 #define MAX_PROCTITLE   2048
  56
  57 /*
  58  * For compatibility with old versions of crt0 that didn't define __ps_strings,
  59  * define it as a common here.
  60  */
  61 struct ps_strings *__ps_strings;
  62
  63 void
  64 setproctitle(const char *fmt, ...)
  65 {
  66         static char buf[MAX_PROCTITLE], *bufp;
  67         const char *pname = getprogname();
  68
  69         if (fmt != NULL) {
  70                 int len = snprintf(buf, sizeof(buf), "%s: ", pname);
  71                 if (len >= 0) {
  72                         va_list ap;
  73
  74                         va_start(ap, fmt);
  75                         (void)vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
  76                         va_end(ap);
  77                 }
  78         } else
  79                 (void)snprintf(buf, sizeof(buf), "%s", pname);
  80
  81         bufp = buf;
  82
  83 #ifdef  USRSTACK
  84         /*
  85          * For compatibility with old versions of crt0 and old kernels, set
  86          * __ps_strings to a default value if it's null.
  87          * But only if USRSTACK is defined.  It might not be defined if
  88          * user-level code can not assume it's a constant (i.e. m68k).
  89          */
  90         if (__ps_strings == 0)
  91                 __ps_strings = PS_STRINGS;
  92 #endif  /* USRSTACK */
  93
  94         if (__ps_strings != 0) {
  95                 __ps_strings->ps_nargvstr = 1;
  96                 __ps_strings->ps_argvstr = &bufp;
  97         }
  98 }