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>
24 #include <sys/sysctl.h>
27 #include <vm/vm_param.h>
34 #include "un-namespace.h"
36 #include "libc_private.h"
39 * Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and
40 * in different locations.
41 * 1: old_ps_strings at the very top of the stack.
42 * 2: old_ps_strings at SPARE_USRSPACE below the top of the stack.
43 * 3: ps_strings at the very top of the stack.
44 * We only support a kernel providing #3 style ps_strings.
46 * For historical purposes, a definition of the old ps_strings structure
47 * and location is preserved below:
48 struct old_ps_strings {
54 #define OLD_PS_STRINGS ((struct old_ps_strings *) \
55 (USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings)))
60 #define SPT_BUFSIZE 2048 /* from other parts of sendmail */
63 setproctitle(const char *fmt, ...)
65 static struct ps_strings *ps_strings;
66 static char *buf = NULL;
67 static char *obuf = NULL;
68 static char **oargv, *kbuf;
69 static int oargc = -1;
70 static char *nargv[2] = { NULL, NULL };
76 unsigned long ul_ps_strings;
80 buf = malloc(SPT_BUFSIZE);
87 obuf = malloc(SPT_BUFSIZE);
96 buf[SPT_BUFSIZE - 1] = '\0';
99 /* skip program name prefix */
103 /* print program name heading for grep */
104 (void)snprintf(buf, SPT_BUFSIZE, "%s: ", _getprogname());
108 /* print the argument string */
109 (void) vsnprintf(buf + len, SPT_BUFSIZE - len, fmt, ap);
114 } else if (*obuf != '\0') {
115 /* Idea from NetBSD - reset the title on fmt == NULL */
120 /* Nothing to restore */
125 /* Set the title into the kernel cached command line */
128 oid[2] = KERN_PROC_ARGS;
130 sysctl(oid, 4, 0, 0, kbuf, strlen(kbuf) + 1);
132 if (ps_strings == NULL) {
133 len = sizeof(ul_ps_strings);
134 if (sysctlbyname("kern.ps_strings", &ul_ps_strings, &len, NULL,
137 ps_strings = (struct ps_strings *)ul_ps_strings;
141 * PS_STRINGS points to zeroed memory on a style #2 kernel.
144 if (ps_strings->ps_argvstr == NULL)
149 /* Record our original args */
150 oargc = ps_strings->ps_nargvstr;
151 oargv = ps_strings->ps_argvstr;
152 for (i = len = 0; i < oargc; i++) {
154 * The program may have scribbled into its
155 * argv array, e.g., to remove some arguments.
156 * If that has happened, break out before
157 * trying to call strlen on a NULL pointer.
159 if (oargv[i] == NULL) {
163 snprintf(obuf + len, SPT_BUFSIZE - len, "%s%s",
164 len != 0 ? " " : "", oargv[i]);
167 len += strlen(oargv[i]);
168 if (len >= SPT_BUFSIZE)
172 ps_strings->ps_nargvstr = nargc;
173 ps_strings->ps_argvstr = nargvp;