/* setproctitle -- set process title shown by ps(1)
 $Id: setproctitle.c,v 1.16 2003/02/13 20:15:30 rjs3 Exp $
 
 * Copyright (c) 1998-2003 Carnegie Mellon University.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*
 * Copyright (c) 1983, 1995 Eric P. Allman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include <stdio.h>
#include <stdarg.h>
#include <string.h>

#include "xmalloc.h"

# define VA_LOCAL_DECL	va_list ap;
# define VA_START(f)	va_start(ap, f)
# define VA_END		va_end(ap)

# define MAXLINE 2048            /* max line length */

extern char **environ;
#ifdef USE_SETPROCTITLE
int setproctitle_enable = 1;
#else
int setproctitle_enable = 0;
#endif

static char		**Argv = NULL;		/* pointer to argument vector */
static char		*LastArgv = NULL;	/* end of argv */

/*
 * Sets up a process to be able to use setproctitle()
 */
void setproctitle_init(int argc, char **argv, char **envp)
{
    int i;

    if (!setproctitle_enable) return;

    /*
     * Move the environment so setproctitle can use the space at
     * the top of memory.
     */
    for (i = 0; envp[i] != NULL; i++)
	continue;
    environ = (char **) xmalloc(sizeof (char *) * (i + 1));
    for (i = 0; envp[i] != NULL; i++)
	environ[i] = xstrdup(envp[i]);
    environ[i] = NULL;

    /*
     * Save start and extent of argv for setproctitle.
     */

    Argv = argv;
    if (i > 0)
      LastArgv = envp[i - 1] + strlen(envp[i - 1]);
    else
      LastArgv = argv[argc - 1] + strlen(argv[argc - 1]);
}

/*
**  SETPROCTITLE -- set process title for ps
**
**	Parameters:
**		fmt -- a printf style format string.
**		a, b, c -- possible parameters to fmt.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Clobbers argv of our main procedure so ps(1) will
**		display the title.
*/

#define SPT_NONE	0	/* don't use it at all */
#define SPT_REUSEARGV	1	/* cover argv with title information */
#define SPT_BUILTIN	2	/* use libc builtin */
#define SPT_PSTAT	3	/* use pstat(PSTAT_SETCMD, ...) */
#define SPT_PSSTRINGS	4	/* use PS_STRINGS->... */
#define SPT_SYSMIPS	5	/* use sysmips() supported by NEWS-OS 6 */
#define SPT_SCO		6	/* write kernel u. area */

#ifndef SPT_TYPE
# define SPT_TYPE	SPT_REUSEARGV
#endif

#if SPT_TYPE != SPT_NONE && SPT_TYPE != SPT_BUILTIN

# if SPT_TYPE == SPT_PSTAT
#  include <sys/pstat.h>
# endif
# if SPT_TYPE == SPT_PSSTRINGS
#  include <machine/vmparam.h>
#  include <sys/exec.h>
#  ifndef PS_STRINGS	/* hmmmm....  apparently not available after all */
#   undef SPT_TYPE
#   define SPT_TYPE	SPT_REUSEARGV
#  else
#   ifndef NKPDE			/* FreeBSD 2.0 */
#    define NKPDE 63
typedef unsigned int	*pt_entry_t;
#   endif
#  endif
# endif

# if SPT_TYPE == SPT_PSSTRINGS
#  define SETPROC_STATIC	static
# else
#  define SETPROC_STATIC
# endif

# if SPT_TYPE == SPT_SYSMIPS
#  include <sys/sysmips.h>
#  include <sys/sysnews.h>
# endif

# if SPT_TYPE == SPT_SCO
#  include <sys/immu.h>
#  include <sys/dir.h>
#  include <sys/user.h>
#  include <sys/fs/s5param.h>
#  if PSARGSZ > MAXLINE
#   define SPT_BUFSIZE	PSARGSZ
#  endif
# endif

# ifndef SPT_PADCHAR
#  define SPT_PADCHAR	' '
# endif

# ifndef SPT_BUFSIZE
#  define SPT_BUFSIZE	MAXLINE
# endif

#endif /* SPT_TYPE != SPT_NONE && SPT_TYPE != SPT_BUILTIN */

#if SPT_TYPE != SPT_BUILTIN

/*VARARGS1*/
void
setproctitle(const char *fmt, ...)
{
# if SPT_TYPE != SPT_NONE
	register char *p;
	register int i;
	SETPROC_STATIC char buf[SPT_BUFSIZE];
	VA_LOCAL_DECL
#  if SPT_TYPE == SPT_PSTAT
	union pstun pst;
#  endif
#  if SPT_TYPE == SPT_SCO
	off_t seek_off;
	static int kmem = -1;
	static int kmempid = -1;
	struct user u;
#  endif
#  if SPT_TYPE == SPT_REUSEARGV
	extern char **Argv;
	extern char *LastArgv;
#  endif

	if (!setproctitle_enable) return;

	p = buf;

	/* print the argument string */
	VA_START(fmt);
	(void) vsprintf(p, fmt, ap);
	VA_END;

	i = strlen(buf);

#  if SPT_TYPE == SPT_PSTAT
	pst.pst_command = buf;
	pstat(PSTAT_SETCMD, pst, i, 0, 0);
#  endif
#  if SPT_TYPE == SPT_PSSTRINGS
	PS_STRINGS->ps_nargvstr = 1;
	PS_STRINGS->ps_argvstr = buf;
#  endif
#  if SPT_TYPE == SPT_SYSMIPS
	sysmips(SONY_SYSNEWS, NEWS_SETPSARGS, buf);
#  endif
#  if SPT_TYPE == SPT_SCO
	if (kmem < 0 || kmempid != getpid())
	{
		if (kmem >= 0)
			close(kmem);
		kmem = open(_PATH_KMEM, O_RDWR, 0);
		if (kmem < 0)
			return;
		(void) fcntl(kmem, F_SETFD, 1);
		kmempid = getpid();
	}
	buf[PSARGSZ - 1] = '\0';
	seek_off = UVUBLK + (off_t) u.u_psargs - (off_t) &u;
	if (lseek(kmem, (char *) seek_off, SEEK_SET) == seek_off)
		(void) write(kmem, buf, PSARGSZ);
#  endif
#  if SPT_TYPE == SPT_REUSEARGV
	if (i > LastArgv - Argv[0] - 2)
	{
		i = LastArgv - Argv[0] - 2;
		buf[i] = '\0';
	}
	(void) strcpy(Argv[0], buf);
	p = &Argv[0][i];
	while (p < LastArgv)
		*p++ = SPT_PADCHAR;
	Argv[1] = NULL;
#  endif
# endif /* SPT_TYPE != SPT_NONE */
}

#endif /* SPT_TYPE != SPT_BUILTIN */
