1 /* 2 * Copyright (c) 1995 Peter Wemm <peter@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, is permitted provided that the following conditions 7 * are met: 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 15 * Peter Wemm. 16 * 17 * $Id$ 18 */ 19 20 #include <sys/types.h> 21 #include <sys/param.h> 22 #include <sys/exec.h> 23 #include <sys/sysctl.h> 24 25 #include <vm/vm.h> 26 #include <vm/vm_param.h> 27 #include <vm/pmap.h> 28 29 #include <stdio.h> 30 #include <string.h> 31 #include <stdlib.h> 32 33 /* 34 * Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and 35 * in different locations. 36 * 1: old_ps_strings at the very top of the stack. 37 * 2: old_ps_strings at SPARE_USRSPACE below the top of the stack. 38 * 3: ps_strings at the very top of the stack. 39 * This attempts to support a kernel built in the #2 and #3 era. 40 */ 41 42 struct old_ps_strings { 43 char *old_ps_argvstr; 44 int old_ps_nargvstr; 45 char *old_ps_envstr; 46 int old_ps_nenvstr; 47 }; 48 #define OLD_PS_STRINGS ((struct old_ps_strings *) \ 49 (USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings))) 50 51 #if defined(__STDC__) /* from other parts of sendmail */ 52 #include <stdarg.h> 53 #else 54 #include <varargs.h> 55 #endif 56 57 58 #define SPT_BUFSIZE 2048 /* from other parts of sendmail */ 59 extern char * __progname; /* is this defined in a .h anywhere? */ 60 61 void 62 #if defined(__STDC__) 63 setproctitle(const char *fmt, ...) 64 #else 65 setproctitle(fmt, va_alist) 66 const char *fmt; 67 va_dcl 68 #endif 69 { 70 static char buf[SPT_BUFSIZE]; 71 static char *ps_argv[2]; 72 va_list ap; 73 int mib[2]; 74 struct ps_strings *ps_strings; 75 size_t len; 76 77 #if defined(__STDC__) 78 va_start(ap, fmt); 79 #else 80 va_start(ap); 81 #endif 82 83 buf[sizeof(buf) - 1] = '\0'; 84 if (fmt) { 85 86 /* print program name heading for grep */ 87 (void) snprintf(buf, sizeof(buf) - 1, "%s: ", __progname); 88 89 /* 90 * can't use return from sprintf, as that is the count of how 91 * much it wanted to write, not how much it actually did. 92 */ 93 94 len = strlen(buf); 95 96 /* print the argument string */ 97 (void) vsnprintf(buf + len, sizeof(buf) - 1 - len, fmt, ap); 98 } else { 99 /* Idea from NetBSD - reset the title on fmt == NULL */ 100 strncpy(buf, __progname, sizeof(buf) - 1); 101 } 102 103 va_end(ap); 104 105 ps_strings = NULL; 106 mib[0] = CTL_KERN; 107 mib[1] = KERN_PS_STRINGS; 108 len = sizeof(ps_strings); 109 if (sysctl(mib, 2, &ps_strings, &len, NULL, 0) < 0 || 110 ps_strings == NULL) 111 ps_strings = PS_STRINGS; 112 113 /* PS_STRINGS points to zeroed memory on a style #2 kernel */ 114 if (ps_strings->ps_argvstr) { 115 /* style #3 */ 116 ps_argv[0] = buf; 117 ps_argv[1] = NULL; 118 ps_strings->ps_nargvstr = 1; 119 ps_strings->ps_argvstr = ps_argv; 120 } else { 121 /* style #2 */ 122 OLD_PS_STRINGS->old_ps_nargvstr = 1; 123 OLD_PS_STRINGS->old_ps_argvstr = buf; 124 } 125 } 126