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/*
* Copyright (c) 1995 Peter Wemm <peter@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* 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. Absolutely no warranty of function or purpose is made by the author
* Peter Wemm.
*
* $Id: setproctitle.c,v 1.2 1996/02/24 14:37:29 peter Exp $
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/*
* Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and
* in different locations.
* 1: old_ps_strings at the very top of the stack.
* 2: old_ps_strings at SPARE_USRSPACE below the top of the stack.
* 3: ps_strings at the very top of the stack.
* This attempts to support a kernel built in the #2 and #3 era.
*/
struct old_ps_strings {
char *old_ps_argvstr;
int old_ps_nargvstr;
char *old_ps_envstr;
int old_ps_nenvstr;
};
#define OLD_PS_STRINGS ((struct old_ps_strings *) \
(USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings)))
#if defined(__STDC__) /* from other parts of sendmail */
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#define SPT_BUFSIZE 2048 /* from other parts of sendmail */
extern char * __progname; /* is this defined in a .h anywhere? */
void
#if defined(__STDC__)
setproctitle(const char *fmt, ...)
#else
setproctitle(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
static char buf[SPT_BUFSIZE];
static char *ps_argv[2];
va_list ap;
int mib[2];
struct ps_strings *ps_strings;
size_t len;
#if defined(__STDC__)
va_start(ap, fmt);
#else
va_start(ap);
#endif
buf[sizeof(buf) - 1] = '\0';
if (fmt) {
/* print program name heading for grep */
(void) snprintf(buf, sizeof(buf) - 1, "%s: ", __progname);
/*
* can't use return from sprintf, as that is the count of how
* much it wanted to write, not how much it actually did.
*/
len = strlen(buf);
/* print the argument string */
(void) vsnprintf(buf + len, sizeof(buf) - 1 - len, fmt, ap);
} else {
/* Idea from NetBSD - reset the title on fmt == NULL */
strncpy(buf, __progname, sizeof(buf) - 1);
}
va_end(ap);
ps_strings = NULL;
mib[0] = CTL_KERN;
mib[1] = KERN_PS_STRINGS;
len = sizeof(ps_strings);
if (sysctl(mib, 2, &ps_strings, &len, NULL, 0) < 0 ||
ps_strings == NULL)
ps_strings = PS_STRINGS;
/* PS_STRINGS points to zeroed memory on a style #2 kernel */
if (ps_strings->ps_argvstr) {
/* style #3 */
ps_argv[0] = buf;
ps_argv[1] = NULL;
ps_strings->ps_nargvstr = 1;
ps_strings->ps_argvstr = ps_argv;
} else {
/* style #2 */
OLD_PS_STRINGS->old_ps_nargvstr = 1;
OLD_PS_STRINGS->old_ps_argvstr = buf;
}
}
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