2 * Copyright (c) 1995 Peter Wemm <peter@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, is permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Absolutely no warranty of function or purpose is made by the author
17 * $FreeBSD: src/lib/libc/gen/setproctitle.c,v 1.18 2003/07/01 09:45:35 alfred Exp $
20 #include "namespace.h"
21 #include <sys/types.h>
22 #include <sys/param.h>
24 #include <sys/sysctl.h>
28 #include <vm/vm_param.h>
34 #include "un-namespace.h"
36 #include "libc_private.h"
37 #include "../upmap/upmap.h"
40 * Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and
41 * in different locations.
42 * 1: old_ps_strings at the very top of the stack.
43 * 2: old_ps_strings at SPARE_USRSPACE below the top of the stack.
44 * 3: ps_strings at the very top of the stack.
45 * This attempts to support a kernel built in the #2 and #3 era.
48 struct old_ps_strings {
54 #define OLD_PS_STRINGS ((struct old_ps_strings *) \
55 (USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings)))
59 #define SPT_BUFSIZE 2048 /* from other parts of sendmail */
62 setproctitle(const char *fmt, ...)
64 static struct ps_strings *ps_strings;
65 static char *buf = NULL;
66 static char *obuf = NULL;
67 static char **oargv, *kbuf;
68 static int oargc = -1;
69 static char *nargv[2] = { NULL, NULL };
75 unsigned long ul_ps_strings;
80 if (__ukp_spt(fmt, ap) == 0) {
86 buf = malloc(SPT_BUFSIZE);
95 obuf = malloc(SPT_BUFSIZE);
104 buf[SPT_BUFSIZE - 1] = '\0';
107 /* skip program name prefix */
111 /* print program name heading for grep */
112 snprintf(buf, SPT_BUFSIZE, "%s: ", _getprogname());
116 /* print the argument string */
117 vsnprintf(buf + len, SPT_BUFSIZE - len, fmt, ap);
122 } else if (*obuf != '\0') {
123 /* Idea from NetBSD - reset the title on fmt == NULL */
128 /* Nothing to restore */
135 /* Set the title into the kernel cached command line */
138 oid[2] = KERN_PROC_ARGS;
140 sysctl(oid, 4, 0, 0, kbuf, strlen(kbuf) + 1);
142 if (ps_strings == NULL) {
143 len = sizeof(ul_ps_strings);
144 if (sysctlbyname("kern.ps_strings", &ul_ps_strings, &len, NULL,
146 ul_ps_strings = PS_STRINGS;
147 ps_strings = (struct ps_strings *)ul_ps_strings;
150 /* PS_STRINGS points to zeroed memory on a style #2 kernel */
151 if (ps_strings->ps_argvstr) {
154 /* Record our original args */
155 oargc = ps_strings->ps_nargvstr;
156 oargv = ps_strings->ps_argvstr;
157 for (i = len = 0; i < oargc; i++) {
159 * The program may have scribbled into its
160 * argv array, e.g., to remove some arguments.
161 * If that has happened, break out before
162 * trying to call strlen on a NULL pointer.
164 if (oargv[i] == NULL) {
168 snprintf(obuf + len, SPT_BUFSIZE - len, "%s%s",
169 len ? " " : "", oargv[i]);
172 len += strlen(oargv[i]);
173 if (len >= SPT_BUFSIZE)
177 ps_strings->ps_nargvstr = nargc;
178 ps_strings->ps_argvstr = nargvp;
180 /* style #2 - we can only restore our first arg :-( */
182 strncpy(obuf, OLD_PS_STRINGS->old_ps_argvstr,
184 OLD_PS_STRINGS->old_ps_nargvstr = 1;
185 OLD_PS_STRINGS->old_ps_argvstr = nargvp[0];