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setproctitle.c revision 1.5 
      1 /*	$NetBSD: setproctitle.c,v 1.5 1997/05/13 21:34:26 gwr 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 by Christopher G. Demetriou
     18  *	for the NetBSD Project.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 static char rcsid[] = "$NetBSD: setproctitle.c,v 1.5 1997/05/13 21:34:26 gwr Exp $";
     36 #endif /* LIBC_SCCS and not lint */
     37 
     38 #include <sys/param.h>
     39 #include <sys/types.h>
     40 #include <sys/exec.h>
     41 #include <vm/vm.h>
     42 
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 
     47 #ifdef __STDC__
     48 #include <stdarg.h>
     49 #else
     50 #include <varargs.h>
     51 #endif
     52 
     53 #define	MAX_PROCTITLE	2048
     54 
     55 extern char *__progname;		/* Program name, from crt0. */
     56 
     57 #if 1 /* XXX: Remove this when the libc major version changes. */
     58 /*
     59  * XXX: Temporary concession to old executables that were linked
     60  * with an old crt0.o that did not have a __ps_strings variable.
     61  * This "common" variable will be used ONLY by old executables.
     62  */
     63 struct ps_strings *__ps_strings;	/* XXX */
     64 #define	OLD_PS_STRINGS \
     65 	((struct ps_strings *)(USRSTACK - sizeof(struct ps_strings)))
     66 #endif /* XXX */
     67 
     68 void
     69 #if __STDC__
     70 setproctitle(const char *fmt, ...)
     71 #else
     72 setproctitle(fmt, va_alist)
     73 	const char *fmt;
     74 	va_dcl
     75 #endif
     76 {
     77 	va_list ap;
     78 	static char buf[MAX_PROCTITLE], *bufp = buf;
     79 	int used;
     80 
     81 #if __STDC__
     82 	va_start(ap, fmt);
     83 #else
     84 	va_start(ap);
     85 #endif
     86 	if (fmt != NULL) {
     87 		used = snprintf(buf, MAX_PROCTITLE, "%s: ", __progname);
     88 		(void)vsnprintf(buf + used, MAX_PROCTITLE - used, fmt, ap);
     89 	} else
     90 		(void)snprintf(buf, MAX_PROCTITLE, "%s", __progname);
     91 	va_end(ap);
     92 
     93 #if 1 /* XXX: Remove this when the libc major version changes. */
     94 	if (__ps_strings == 0)
     95 		__ps_strings = OLD_PS_STRINGS;
     96 #endif /* XXX */
     97 
     98 	PS_STRINGS->ps_nargvstr = 1;
     99 	PS_STRINGS->ps_argvstr = &bufp;
    100 }
    101