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 * $FreeBSD$ 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 #include <unistd.h> 33 34 /* 35 * Older FreeBSD 2.0, 2.1 and 2.2 had different ps_strings structures and 36 * in different locations. 37 * 1: old_ps_strings at the very top of the stack. 38 * 2: old_ps_strings at SPARE_USRSPACE below the top of the stack. 39 * 3: ps_strings at the very top of the stack. 40 * This attempts to support a kernel built in the #2 and #3 era. 41 */ 42 43 struct old_ps_strings { 44 char *old_ps_argvstr; 45 int old_ps_nargvstr; 46 char *old_ps_envstr; 47 int old_ps_nenvstr; 48 }; 49 #define OLD_PS_STRINGS ((struct old_ps_strings *) \ 50 (USRSTACK - SPARE_USRSPACE - sizeof(struct old_ps_strings))) 51 52 #include <stdarg.h> 53 54 #define SPT_BUFSIZE 2048 /* from other parts of sendmail */ 55 extern char * __progname; /* is this defined in a .h anywhere? */ 56 57 void 58 setproctitle(const char *fmt, ...) 59 { 60 static struct ps_strings *ps_strings; 61 static char buf[SPT_BUFSIZE]; 62 static char obuf[SPT_BUFSIZE]; 63 static char **oargv, *kbuf; 64 static int oargc = -1; 65 static char *nargv[2] = { buf, NULL }; 66 char **nargvp; 67 int nargc; 68 va_list ap; 69 size_t len; 70 unsigned long ul_ps_strings; 71 int oid[4]; 72 73 va_start(ap, fmt); 74 75 if (fmt) { 76 buf[sizeof(buf) - 1] = '\0'; 77 78 if (fmt[0] == '-') { 79 /* skip program name prefix */ 80 fmt++; 81 len = 0; 82 } else { 83 /* print program name heading for grep */ 84 (void) snprintf(buf, sizeof(buf), "%s: ", __progname); 85 len = strlen(buf); 86 } 87 88 /* print the argument string */ 89 (void) vsnprintf(buf + len, sizeof(buf) - len, fmt, ap); 90 91 nargvp = nargv; 92 nargc = 1; 93 kbuf = buf; 94 } else if (*obuf != '\0') { 95 /* Idea from NetBSD - reset the title on fmt == NULL */ 96 nargvp = oargv; 97 nargc = oargc; 98 kbuf = obuf; 99 } else 100 /* Nothing to restore */ 101 return; 102 103 va_end(ap); 104 105 /* Set the title into the kernel cached command line */ 106 oid[0] = CTL_KERN; 107 oid[1] = KERN_PROC; 108 oid[2] = KERN_PROC_ARGS; 109 oid[3] = getpid(); 110 sysctl(oid, 4, 0, 0, kbuf, strlen(kbuf) + 1); 111 112 if (ps_strings == NULL) { 113 len = sizeof(ul_ps_strings); 114 if (sysctlbyname("kern.ps_strings", &ul_ps_strings, &len, NULL, 115 0) == -1) 116 ul_ps_strings = PS_STRINGS; 117 ps_strings = (struct ps_strings *)ul_ps_strings; 118 } 119 120 /* PS_STRINGS points to zeroed memory on a style #2 kernel */ 121 if (ps_strings->ps_argvstr) { 122 /* style #3 */ 123 if (oargc == -1) { 124 /* Record our original args */ 125 oargc = ps_strings->ps_nargvstr; 126 oargv = ps_strings->ps_argvstr; 127 for (nargc = len = 0; nargc < oargc; nargc++) { 128 snprintf(obuf + len, sizeof(obuf) - len, "%s%s", 129 len ? " " : "", oargv[nargc]); 130 if (len) 131 len++; 132 len += strlen(oargv[nargc]); 133 if (len >= sizeof(obuf)) 134 break; 135 } 136 } 137 ps_strings->ps_nargvstr = nargc; 138 ps_strings->ps_argvstr = nargvp; 139 } else { 140 /* style #2 - we can only restore our first arg :-( */ 141 if (*obuf == '\0') 142 strncpy(obuf, OLD_PS_STRINGS->old_ps_argvstr, 143 sizeof(obuf) - 1); 144 OLD_PS_STRINGS->old_ps_nargvstr = 1; 145 OLD_PS_STRINGS->old_ps_argvstr = nargvp[0]; 146 } 147 } 148