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
18 #include <sys/cdefs.h>
19 __FBSDID("$FreeBSD$");
21 #include "namespace.h"
22 #include <sys/param.h>
23 #include <sys/elf_common.h>
25 #include <sys/sysctl.h>
31 #include "un-namespace.h"
33 #include "libc_private.h"
36 * Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and
37 * in different locations.
38 * 1: old_ps_strings at the very top of the stack.
39 * 2: old_ps_strings at SPARE_USRSPACE below the top of the stack.
40 * 3: ps_strings at the very top of the stack.
41 * We only support a kernel providing #3 style ps_strings.
43 * For historical purposes, a definition of the old ps_strings structure
44 * and location is preserved below:
45 struct old_ps_strings {
51 #define OLD_PS_STRINGS ((struct old_ps_strings *) \
52 (USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings)))
57 #define SPT_BUFSIZE 2048 /* from other parts of sendmail */
60 setproctitle_internal(const char *fmt, va_list ap)
62 static struct ps_strings *ps_strings;
63 static char *buf = NULL;
64 static char *obuf = NULL;
65 static char **oargv, *kbuf;
66 static int oargc = -1;
67 static char *nargv[2] = { NULL, NULL };
72 unsigned long ul_ps_strings;
75 buf = malloc(SPT_BUFSIZE);
82 obuf = malloc(SPT_BUFSIZE);
89 buf[SPT_BUFSIZE - 1] = '\0';
92 /* skip program name prefix */
96 /* print program name heading for grep */
97 (void)snprintf(buf, SPT_BUFSIZE, "%s: ", _getprogname());
101 /* print the argument string */
102 (void)vsnprintf(buf + len, SPT_BUFSIZE - len, fmt, ap);
107 } else if (*obuf != '\0') {
108 /* Idea from NetBSD - reset the title on fmt == NULL */
113 /* Nothing to restore */
116 if (ps_strings == NULL)
117 (void)_elf_aux_info(AT_PS_STRINGS, &ps_strings,
120 if (ps_strings == NULL) {
121 len = sizeof(ul_ps_strings);
122 if (sysctlbyname("kern.ps_strings", &ul_ps_strings, &len, NULL,
125 ps_strings = (struct ps_strings *)ul_ps_strings;
128 if (ps_strings == NULL)
132 * PS_STRINGS points to zeroed memory on a style #2 kernel.
135 if (ps_strings->ps_argvstr == NULL)
140 /* Record our original args */
141 oargc = ps_strings->ps_nargvstr;
142 oargv = ps_strings->ps_argvstr;
143 for (i = len = 0; i < oargc; i++) {
145 * The program may have scribbled into its
146 * argv array, e.g., to remove some arguments.
147 * If that has happened, break out before
148 * trying to call strlen on a NULL pointer.
150 if (oargv[i] == NULL) {
154 snprintf(obuf + len, SPT_BUFSIZE - len, "%s%s",
155 len != 0 ? " " : "", oargv[i]);
158 len += strlen(oargv[i]);
159 if (len >= SPT_BUFSIZE)
163 ps_strings->ps_nargvstr = nargc;
164 ps_strings->ps_argvstr = nargvp;
169 static int fast_update = 0;
172 setproctitle_fast(const char *fmt, ...)
179 buf = setproctitle_internal(fmt, ap);
182 if (buf && !fast_update) {
183 /* Tell the kernel to start looking in user-space */
186 oid[2] = KERN_PROC_ARGS;
188 sysctl(oid, 4, 0, 0, "", 0);
194 setproctitle(const char *fmt, ...)
201 buf = setproctitle_internal(fmt, ap);
205 /* Set the title into the kernel cached command line */
208 oid[2] = KERN_PROC_ARGS;
210 sysctl(oid, 4, 0, 0, buf, strlen(buf) + 1);